Bob McDavitt's ideas for sailing around the South Pacific.
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 29 June 2025
WMO report on state of our planet in 2024
https://wmo.int/sites/default/files/2025-03/WMO-1368-2024_en.pdf
2024 was 1.55C above the 1850-1900 average and the warmest year in the
175-year observational record, beating the previous record set only
the year before.
One year over 1.5C does not indicate that the long-term temperature
goals of the Paris Agreement are out of reach but is a wake-up call.
The Antarctic sea ice reached the second-lowest extent ever recorded.
The observed ocean heat content reached a new record high. It has
increased by 16ZJ (ZITAJOULES) since last year. O if only we could
harness this. the human annual world energy consumption is measured to
be around 0.5ZJ
In 2024, the global mean sea level reached a record high in the
satellite record (from 1993 to present).
The minimum daily extent of sea-ice in the Antarctic region in 2024
was 1.99 million km2 on 20 February, which tied for the second lowest
minimum in the satellite era and marked the third consecutive year
that minimum Antarctic sea-ice extent dropped below 2 million km2.
There were droughts and floods but no obvious pattern in the rain.
TROPICS
The latest cyclone activity report is at zoom.earth and
tropic.ssec.wisc.edu and Tropical Cyclone Potential is from
http://www.ospo.noaa.gov/products/ocean/tropical/tcfp/
There are two tropical depressions tonight near the Mexican coast, TD6
on the west and TD2 on the east.
Super Hurricane Erick weakened to a Category-3 storm just before
making landfall on Mexico's Oaxaca state, killing one person in flash
flooding. Erick was the first storm on record of Category-3 force or
greater to strike Mexico before July.
. Tropical Storm Andrea, the first named storm of the Atlantic
hurricane season, formed briefly in the mid-Atlantic.
. Tropical Storm Sepat lost force before its remnants brushed the Jap
WEATHER ZONES
Weather Zones Mid-week GFS model showing isobars, winds, waves
(purple), rain (red), STR (Subtropical Ridge), SPCZ (South Pacific
Convergence Zone) CZ (Convergence Zone)
Rain accumulation this week from Windy.com shows a well-defined South
Pacific Convergence zone over southern parts of French Polynesia.
Also, some heavy rain for Northland to Bay of Plenty and about coast
new South Wales from L2. And a rebuilding pf the SPCZ over Solomon
Islands
Wind accumulation this week from Windy.com shows a weak squash zone in
the tropics over Niue to Southern Cooks and a strong one over southern
Fresch Polynesia. Lows also have strong to gale winds around them.
LOWS and HIGHS
LOW L1 tonight is south of Chatham Islands and moving off to the east
along 45S to 40S and expected to be south of 155W by end of the week
HIGH H1 should briefly cross NZ on Tuesday and then move off to the
east quickly followed by NE winds between it and L2. Only quick yachts
can use this window to get from Northland to the tropics.
Low L2 is an east coast low deepening rapidly off coastal New South
Wales on Tuesday . Avoid the Tasman this week. Associated trough
should cross NZ on Friday.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
29 June 2025
22 June 2025
Bobgram
Bob McDavitt's ideas for sailing around the South Pacific.
Disclaimer: Weather is a mix of pattern and chaos; these ideas are from the patterned world.
Compiled 22 June 2025
SOLSTICE and the state of Greenland Ice melt
The Solstice this weekend marked the longest day of the year in the northern hemisphere and the shortest in the southern.
At this time of the year the Pleiades cluster is visible in the eastern sky just before sunrise (so long night light is not swamped by a full moon). This is taken by Polynesians in the southern hemisphere to be the start of a new year. Their name for that cluster is MATARIKI. In New Zealand we celebrated MATARIKI with a Friday holiday and long weekend. Tahiti will celebrate its first Matari'i National Public Holiday in 2026. In Hawaiian culture, the star cluster is known as Makahiki and its rising is also considered the start of the new year for agricultural purposes.
After the solstice there is a thermal lag until ground temperatures reach their annual minimum. For the next six weeks we can say that when the "days get longer the cold gets stronger". In the northern hemisphere a similar heat lag occurs, and ground temperature do not reach their annual PEAK until "the dog days" when the dog star Sirus rises just before dawn. When stargazing, if you can find Orion's belt then look left and up to find Sirus and then look right and down almost twice as far to find Pleiades/Matariki/Matari'I/Makahiki.
So, we are just beginning to move into the period of maximum ice melt in Greenland.
Sadly, the data shows that we are already forming new maximum melt recordings.
See https://nsidc.org/ice-sheets-today
During a May heat wave Greenland's ice sheet melted 17 times faster than normal, according to a new report by World Weather Attribution. In Iceland, temperatures soared past 79 degrees, breaking records and straining infrastructure not designed for such warmth on the island.
TROPICS
Typhoon Wutip left at least six people dead in Vietnam from downpours and flooding. The storm also damaged crops on China's island province of Hainan. * The most active region for tropical cyclone development continues to be off Mexico's Pacific coast, with Tropical Storm Dalila passing offshore and Eric striking Acapulco as a Category-2 hurricane.
WEATHER ZONES
Weather Zones Mid-week GFS model showing isobars, winds, waves (purple), rain (red), STR (Subtropical Ridge), SPCZ (South Pacific Convergence Zone) CZ (Convergence Zone)
Rain accumulation this week from Windy.com shows a well-defined South Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com show a storm on the back side of a low east of NZ. They also show an active squash zone between Niue and Tonga and then a tropical trough forming over Southern cooks after mid-week. Avoid.
LOWS and HIGHS
LOW L1 tonight has a 990hPa centre east of Auckland and south of Niue with gale winds near its centre. It is expected to move off to the SE.
HIGH H1 in central Tasman Sea is expected to also travel SE across north Island next few days mid-week. A squash zone of enhanced trade winds is expected between Niue and Tonga. Avoid.
Low L2 is expected to cross Tasmania on Tuesday and then stall over NZ from Thursday to Saturday..
HIGH H2 is expected to slowly spread across the Aussie Bight this week.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Disclaimer: Weather is a mix of pattern and chaos; these ideas are from the patterned world.
Compiled 22 June 2025
SOLSTICE and the state of Greenland Ice melt
The Solstice this weekend marked the longest day of the year in the northern hemisphere and the shortest in the southern.
At this time of the year the Pleiades cluster is visible in the eastern sky just before sunrise (so long night light is not swamped by a full moon). This is taken by Polynesians in the southern hemisphere to be the start of a new year. Their name for that cluster is MATARIKI. In New Zealand we celebrated MATARIKI with a Friday holiday and long weekend. Tahiti will celebrate its first Matari'i National Public Holiday in 2026. In Hawaiian culture, the star cluster is known as Makahiki and its rising is also considered the start of the new year for agricultural purposes.
After the solstice there is a thermal lag until ground temperatures reach their annual minimum. For the next six weeks we can say that when the "days get longer the cold gets stronger". In the northern hemisphere a similar heat lag occurs, and ground temperature do not reach their annual PEAK until "the dog days" when the dog star Sirus rises just before dawn. When stargazing, if you can find Orion's belt then look left and up to find Sirus and then look right and down almost twice as far to find Pleiades/Matariki/Matari'I/Makahiki.
So, we are just beginning to move into the period of maximum ice melt in Greenland.
Sadly, the data shows that we are already forming new maximum melt recordings.
See https://nsidc.org/ice-sheets-today
During a May heat wave Greenland's ice sheet melted 17 times faster than normal, according to a new report by World Weather Attribution. In Iceland, temperatures soared past 79 degrees, breaking records and straining infrastructure not designed for such warmth on the island.
TROPICS
Typhoon Wutip left at least six people dead in Vietnam from downpours and flooding. The storm also damaged crops on China's island province of Hainan. * The most active region for tropical cyclone development continues to be off Mexico's Pacific coast, with Tropical Storm Dalila passing offshore and Eric striking Acapulco as a Category-2 hurricane.
WEATHER ZONES
Weather Zones Mid-week GFS model showing isobars, winds, waves (purple), rain (red), STR (Subtropical Ridge), SPCZ (South Pacific Convergence Zone) CZ (Convergence Zone)
Rain accumulation this week from Windy.com shows a well-defined South Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com show a storm on the back side of a low east of NZ. They also show an active squash zone between Niue and Tonga and then a tropical trough forming over Southern cooks after mid-week. Avoid.
LOWS and HIGHS
LOW L1 tonight has a 990hPa centre east of Auckland and south of Niue with gale winds near its centre. It is expected to move off to the SE.
HIGH H1 in central Tasman Sea is expected to also travel SE across north Island next few days mid-week. A squash zone of enhanced trade winds is expected between Niue and Tonga. Avoid.
Low L2 is expected to cross Tasmania on Tuesday and then stall over NZ from Thursday to Saturday..
HIGH H2 is expected to slowly spread across the Aussie Bight this week.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
15 June 2025
Bobgram 15 June
Bob McDavitt's ideas for sailing around the South Pacific.
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 15 June 2025
HOW TO EVADE THE WORST
The "Law of storms" or more pedantically correct "Law of Gyration,"
(or the law of the rotation of winds) was compiled in 1860s to help
sailing master mariners know which way to sail when encountering the
winds that rotate around storms. These were compiled soon after the
birth of weather maps with isobars and around 50 years before the
birth of weather maps with fronts.
Here is a link to the original article thanks to STARPATH
https://www.starpath.com/resources2/Practical_Matters_from_Dove.pdf
Around 30 years ago during the (in those days) Queens Birthday in
early June 1994 a fleet of yachts sailing from New Zealand to Fiji
encountered a deepening Low that formed off the southeast of Ne
Caledonia.
This became known as the "Pacific Storm" and prompted me to collect
together notes about South Pacific sailing as the MetService Mariners
Met Pack. This is still available at
http://about.metservice.com/our-company/learning-centre/mariners-met-p
ack/
As part of that booklet, I revisited Dove's "Law of storms" and
produced these two flow charts, reproduced in my illustrated
weathergram for your educational enjoyment at
https://metbob.wordpress.com/2025/06/16/bob-blog-15-june/
TROPICS
The latest cyclone activity report is at zoom.earth and
tropic.ssec.wisc.edu and Tropical Cyclone Potential is from
http://www.ospo.noaa.gov/products/ocean/tropical/tcfp/
Tropical Storm Wutip drenched South China's Hainan and Guangdong
provinces as the first named storm of the typhoon season. . Tropical
Storm Cosme , short-lived Hurricane Barbara spun up off Mexico's
Pacific coast followed by DELILA
WEATHER ZONES
Rain accumulation this week from Windy.com shows a well-defined South
Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com shows enhanced SE
winds in the Coral Sea and around L1 east of New Zealand.
LOWS and HIGHS
LOW L1 tonight comprises of several tight centres forming under a jet
stream between 25 and 30S and in area north of NZ. These should gel
into one on Monday and then travel southeast and deepen in the
subtropics. There is likely to be a lull on the tropical side of L1
along with a passing trough over Niue on Monday/Tuesday and Southern
Cooks mid-week. This passing trough is looking to be mediocre in the
tropics. However, L1 has strong winds around it
HIGH H1 in south Tasman Sea is expected to spread across central NZ
mid-week and then travel east from 40S to 30S when east of NZ. After
Wednesday it may enhance the trade winds on its northern side,
especially between Niue and southern Cooks.
Low L2 is expected to cross Tasmania on Tuesday and then southern New
Zealand on Thursday followed by a southerly flow over NZ on Friday.
This is followed by H2 travelling between 30 and 40S crossing New
South Wales on Wednesday and northern NZ on Saturday/Sunday.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 15 June 2025
HOW TO EVADE THE WORST
The "Law of storms" or more pedantically correct "Law of Gyration,"
(or the law of the rotation of winds) was compiled in 1860s to help
sailing master mariners know which way to sail when encountering the
winds that rotate around storms. These were compiled soon after the
birth of weather maps with isobars and around 50 years before the
birth of weather maps with fronts.
Here is a link to the original article thanks to STARPATH
https://www.starpath.com/resources2/Practical_Matters_from_Dove.pdf
Around 30 years ago during the (in those days) Queens Birthday in
early June 1994 a fleet of yachts sailing from New Zealand to Fiji
encountered a deepening Low that formed off the southeast of Ne
Caledonia.
This became known as the "Pacific Storm" and prompted me to collect
together notes about South Pacific sailing as the MetService Mariners
Met Pack. This is still available at
http://about.metservice.com/our-company/learning-centre/mariners-met-p
ack/
As part of that booklet, I revisited Dove's "Law of storms" and
produced these two flow charts, reproduced in my illustrated
weathergram for your educational enjoyment at
https://metbob.wordpress.com/2025/06/16/bob-blog-15-june/
TROPICS
The latest cyclone activity report is at zoom.earth and
tropic.ssec.wisc.edu and Tropical Cyclone Potential is from
http://www.ospo.noaa.gov/products/ocean/tropical/tcfp/
Tropical Storm Wutip drenched South China's Hainan and Guangdong
provinces as the first named storm of the typhoon season. . Tropical
Storm Cosme , short-lived Hurricane Barbara spun up off Mexico's
Pacific coast followed by DELILA
WEATHER ZONES
Rain accumulation this week from Windy.com shows a well-defined South
Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com shows enhanced SE
winds in the Coral Sea and around L1 east of New Zealand.
LOWS and HIGHS
LOW L1 tonight comprises of several tight centres forming under a jet
stream between 25 and 30S and in area north of NZ. These should gel
into one on Monday and then travel southeast and deepen in the
subtropics. There is likely to be a lull on the tropical side of L1
along with a passing trough over Niue on Monday/Tuesday and Southern
Cooks mid-week. This passing trough is looking to be mediocre in the
tropics. However, L1 has strong winds around it
HIGH H1 in south Tasman Sea is expected to spread across central NZ
mid-week and then travel east from 40S to 30S when east of NZ. After
Wednesday it may enhance the trade winds on its northern side,
especially between Niue and southern Cooks.
Low L2 is expected to cross Tasmania on Tuesday and then southern New
Zealand on Thursday followed by a southerly flow over NZ on Friday.
This is followed by H2 travelling between 30 and 40S crossing New
South Wales on Wednesday and northern NZ on Saturday/Sunday.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
08 June 2025
Bobgram
Bob McDavitt's ideas for sailing around the South Pacific.
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 8 June 2025
A review of last month's weather
A recent report summarises an investigation into how fast the planet's
land areas are heating up.
https://www.climatecentral.org/report/climate-change-and-the-escalatio
n-of-global-extreme-heat-2025
In particular it studies 67 extreme heat events in 247 countries in
the year ending 1 May 2025
The only areas with little change are the south coast of Australia,
parts of coastal Antarctica, a zone near Moscow, and spots in USA and
Brazil.
The study was able to calculate the contribution of Climate change,
using the Climate shift index. For more information on their
methodology please read the report.
Basically, the main impact of climate change on temperature is in the
equatorial zone.
TROPICS
Cyclone Barbara is travelling NW parallel to Mexican west coast and
expected to peel off to the west at 20S.
WEATHER ZONES
Rain accumulation this week from Windy.com shows a well-defined South
Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com shows enhanced
SE winds in the Coral Sea and a well-defined squash zone near 25S
between Fiji and New Zealand.
LOWS and HIGHS
HIGH H1 is tonight centred on25S south of Fiji, and this week expected
to travel off to the east. Associated ridge may briefly cross New
Zealand on Monday night.
Deep Low now east of New Zealand is moving off to the east.
Low L1 is expected to form off southern New South Wales coast by
Monday and coast on Monday and deepen as it crosses NZ slowly from
Tuesday to Friday, with a southerly flow in Tasman Sea.
HIGH H2 in Aussie bight should move NE across New South Wales on
Thursday and weaken in the northern Tasman Sea by end of the week,
enhancing SE winds in the Coral Sea.
Gulf of Panama: light winds becoming mainly SW 15 to 20kt.
8N to 2N: Squally often westerly or SW winds and a sea drifting to
east
2N to Galapagos: Winds from between SE and S and a sea drifting to the
NW/west
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 8 June 2025
A review of last month's weather
A recent report summarises an investigation into how fast the planet's
land areas are heating up.
https://www.climatecentral.org/report/climate-change-and-the-escalatio
n-of-global-extreme-heat-2025
In particular it studies 67 extreme heat events in 247 countries in
the year ending 1 May 2025
The only areas with little change are the south coast of Australia,
parts of coastal Antarctica, a zone near Moscow, and spots in USA and
Brazil.
The study was able to calculate the contribution of Climate change,
using the Climate shift index. For more information on their
methodology please read the report.
Basically, the main impact of climate change on temperature is in the
equatorial zone.
TROPICS
Cyclone Barbara is travelling NW parallel to Mexican west coast and
expected to peel off to the west at 20S.
WEATHER ZONES
Rain accumulation this week from Windy.com shows a well-defined South
Pacific Convergence zone from Solomons to Samoa.
Wind and rain accumulation this week from Windy.com shows enhanced
SE winds in the Coral Sea and a well-defined squash zone near 25S
between Fiji and New Zealand.
LOWS and HIGHS
HIGH H1 is tonight centred on25S south of Fiji, and this week expected
to travel off to the east. Associated ridge may briefly cross New
Zealand on Monday night.
Deep Low now east of New Zealand is moving off to the east.
Low L1 is expected to form off southern New South Wales coast by
Monday and coast on Monday and deepen as it crosses NZ slowly from
Tuesday to Friday, with a southerly flow in Tasman Sea.
HIGH H2 in Aussie bight should move NE across New South Wales on
Thursday and weaken in the northern Tasman Sea by end of the week,
enhancing SE winds in the Coral Sea.
Gulf of Panama: light winds becoming mainly SW 15 to 20kt.
8N to 2N: Squally often westerly or SW winds and a sea drifting to
east
2N to Galapagos: Winds from between SE and S and a sea drifting to the
NW/west
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
01 June 2025
Bobgram
Bob McDavitt's ideas for sailing around the South Pacific.
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 1 June 2025
A review of last month's weather
Here is a link to a YouTube clip giving an animated loop of the
isobars and streamlines in the South Pacific for the last month at
youtu.be/TZUof6eDnBY
The highlight of the month for the South Pacific tropics was a chain
of lows that formed around 10 May. Further south it was a series of
Lows and Highs
The 500hPa heights and anomalies shows last month's typical ridge
/trough pattern,
From http://www.cpc.ncep.noaa.gov/products/intraseasonal/z500_sh_anim.
shtml
Sea Surface temperature anomalies as at 30 May
from psl.noaa.gov/map/clim/sst.shtml
The Galapagos area is now showing warm anomalies.
There is a cold anomaly along the Canadian east coast
Also stronger upwelling and cold water off Baja California.
The Kuroshio current is warmer than normal..
From http://www.psl.noaa.gov/map/images/fnl/slp_30b.fnl.html
During May the main changes have been season. The Sub tropical ridge
in southern hemisphere has weakened. The heat low over Asia has
intensified and pressures have risen over Siberia.
Pressure anomalies for past month (below)
Shows the reversal of those anomalous April lows in Tasman Sea and
mid-South Atlantic,.
The 1020 isobar has shifted northwards .
TROPICS
The latest cyclone activity report is at zoom.earth and
tropic.ssec.wisc.edu and Tropical Cyclone Potential is
from http://www.ospo.noaa.gov/products/ocean/tropical/tcfp/
A quiet time for tropical cyclones. Tropical Storm Alvin, the first
named storm of the eastern North Pacific hurricane season, formed off
the coast of southern Mexico.
WEATHER ZONES
Rain accumulation this week from Windy.com shows well defined SPCZ
between Solomon Islands and Samoa. Also a passing trough near French
Polynesia.
Wind and rain accumulation this week from Windy.com
The wind accumulation shows a small squash zone ner Southern Cooks on
north side of a traveling High mainly on 4 and 5 June. Also bands of
strong winds off east of NZ around a deep low mainly after Wednesday.
LOWS and HIGHS
HIGH H1 has been crossing by north of NZ today and is expected to
travell east along 30 to 35S stalling south of French Polynesia late
in the week
Low L1, is expected top form off Queensland coast on Monday and
deepen crossing NZ on Thursday and Friday then lingering east of NZ at
end of the week with a southerly flow over NZ.
HIGH H2 in Aussie bight should move NE across New South Wales on
Thursday and weaken in the northern Tasman Sea by end of the week.
LowlL2 should follow H2, reaching New South Wales at end of the week.
Gulf of Panama: SW 10kt becoming light winds after Thursday, but
oulook next week is for SW up to 20kt .
6N to 2N: Showery, often westerly or SW winds and a sea drifting to
east
2N to Galapagos: Winds from between SE and S and a sea drifting to the
NW/west
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.
Compiled 1 June 2025
A review of last month's weather
Here is a link to a YouTube clip giving an animated loop of the
isobars and streamlines in the South Pacific for the last month at
youtu.be/TZUof6eDnBY
The highlight of the month for the South Pacific tropics was a chain
of lows that formed around 10 May. Further south it was a series of
Lows and Highs
The 500hPa heights and anomalies shows last month's typical ridge
/trough pattern,
From http://www.cpc.ncep.noaa.gov/products/intraseasonal/z500_sh_anim.
shtml
Sea Surface temperature anomalies as at 30 May
from psl.noaa.gov/map/clim/sst.shtml
The Galapagos area is now showing warm anomalies.
There is a cold anomaly along the Canadian east coast
Also stronger upwelling and cold water off Baja California.
The Kuroshio current is warmer than normal..
From http://www.psl.noaa.gov/map/images/fnl/slp_30b.fnl.html
During May the main changes have been season. The Sub tropical ridge
in southern hemisphere has weakened. The heat low over Asia has
intensified and pressures have risen over Siberia.
Pressure anomalies for past month (below)
Shows the reversal of those anomalous April lows in Tasman Sea and
mid-South Atlantic,.
The 1020 isobar has shifted northwards .
TROPICS
The latest cyclone activity report is at zoom.earth and
tropic.ssec.wisc.edu and Tropical Cyclone Potential is
from http://www.ospo.noaa.gov/products/ocean/tropical/tcfp/
A quiet time for tropical cyclones. Tropical Storm Alvin, the first
named storm of the eastern North Pacific hurricane season, formed off
the coast of southern Mexico.
WEATHER ZONES
Rain accumulation this week from Windy.com shows well defined SPCZ
between Solomon Islands and Samoa. Also a passing trough near French
Polynesia.
Wind and rain accumulation this week from Windy.com
The wind accumulation shows a small squash zone ner Southern Cooks on
north side of a traveling High mainly on 4 and 5 June. Also bands of
strong winds off east of NZ around a deep low mainly after Wednesday.
LOWS and HIGHS
HIGH H1 has been crossing by north of NZ today and is expected to
travell east along 30 to 35S stalling south of French Polynesia late
in the week
Low L1, is expected top form off Queensland coast on Monday and
deepen crossing NZ on Thursday and Friday then lingering east of NZ at
end of the week with a southerly flow over NZ.
HIGH H2 in Aussie bight should move NE across New South Wales on
Thursday and weaken in the northern Tasman Sea by end of the week.
LowlL2 should follow H2, reaching New South Wales at end of the week.
Gulf of Panama: SW 10kt becoming light winds after Thursday, but
oulook next week is for SW up to 20kt .
6N to 2N: Showery, often westerly or SW winds and a sea drifting to
east
2N to Galapagos: Winds from between SE and S and a sea drifting to the
NW/west
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If you would like more details about your voyage, check metbob.com
Or Facebook at /www.facebook.com/metbobnz/
Weathergram with graphics is at metbob.wordpress.com
(subscribe/unsubscribe at bottom).
Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
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