Bob Blog 5 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 Sunday 05 June 2022

REVIEW OF THE LAST MONTH (May 2022)
Sea Surface temperature anomalies from
psl.noaa.gov/map/clim/sst.shtml

Sea surface temperature anomolies: the cool eddies along the eastern
equatorial Pacific that signify LA Nina are relaxing. The surrounding C
shaped ring of warm water across north Pacific Indonesia and South Pacific,
and warm zones across the south Tasman Sea and off South Africa are more
intense than last month.

To see how the annual weather cycle and the seasons are working out, we can
check the average isobar maps for past 30 days and their anomaly from
psl.noaa.gov/map/images/fnl/slp_30b.fnl.html
The subtropical ridge in the northern Hemisphere has weakened since last
month.
The anomaly map shows that the lows around Australia are wider than last
month , and there is a high area between Australia and Antarctica.
Zooming into the NZ area, These maps show that the subtropical ridge has
sifted north and weakened, as shown by the 1015 over Australia/NZ, and the
fading of the 1020 off South America.

TROPICS
A few days before the nominal start of the North Pacific/Atlantic cyclone
season AGATHA made land fall over SW Mexico as a hurricane. It weakened as
it travelled over land, and its remnants redeveloping into damaging rain
over Cuba yesterday. This system is just a tropical depression for now,
labelled ONE or AL01, but may soon earn a new name as it is forecast to
bring damaging conditions to Florida tomorrow.

WEATHER ZONES
SPCZ=South Pacific ConvL1ergence zone.
The SPCZ stretches from PNG/Coral sea to Northern Vanuatu is looking rather
weak this week.
Convergence zone forming around Niue area is expected to travel east to
Tahiti area by late in the week
The best route this week from Tahiti westwards this week seems to be the
northern route.

HIGHS and LOWS
High H1 was over NZ today/Saturday and is travelling off to the east
Low L1 is expected to form south of Tahiti by mid-week.
Low L2 is expected to travel along 45 to 50S from Tasmania to NZ by mid-week
and may be followed by another similar Low. Associated troughs are likely to
cross NZ on Sunday, Tuesday and Friday/Saturday, making it difficult to find
a good day to depart from Opua.

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If you would like more detail for your voyage, then check metbob.com to see
what I offer.
Or Facebook at /www.facebook.com/metbobnz/
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at bottom).
Weathergram archive (with translator) is at weathergram.blogspot.co.nz.
Contact is bob@metbob.com or txt 64277762212
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