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WEATHERGRAM

Bob McDavitt's ideas for sailing weather around the South pacific

28 August 2016

Bob Blog 28 Aug

WEATHERGRAM
YOTREPS
Issued 28 August 2016
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.

SOI The Southern Oscillation Index SOI sums up the weather pattern over the
South Pacific as one number. It is based on the standardized difference in the
barometer readings between Tahiti and Darwin.

SOI (30 day running mean) remains in neutral territory. Its 30-day running mean
is in the 1 to 9 units area on the Australian scale. SOI trend (x10) since 2013
showing us in neutral territory is seen at
www.farmonlineweather.com.au/climate/indicator_enso.jsp?c=soi

The Ocean: The warmer the sea the quicker it evaporates, tossing water vapour
into the air, where is rises and cools into cloud. The equatorial Pacific region
hosts the widest and warmest sea on the planet. Thus its sea surface
temperatures SST may be thought of as a factor in the running of planetary
weather engine. When SST in the target zone (equatorial Pacific between dateline
and Galapagos) are notably cooler than normal, this is called a La Nina episode.

Sea surface temperature anomaly may be seen at
www.farmonlineweather.com.au/climate/indicator_enso.jsp?c=nino34&p=monthly shows
that we now have cooling seas in the target area, and there MAY be a weak La
Nina in the next few months

The Tropics
TC LIONROCK is in the NW Pacific, TC MADELINE may reach Hawaii next weekend,
(LESTER, further east is fading) and TC GASTON is expected to turn around mid -
Atlantic. There are also two possible tropical lows, labelled GENESIS in track
map atruc.noaa.gov/tracks/, which may affect eastern coast USA this week.

Rain activity is generally weakening except for a few spots in the Indian Ocean
and around Japan.
Rain for the past fortnight from
trmm.gsfc.nasals.gov/trmm_rain/Events/big_global_accumulation.gif

WEATHER ZONES
SPCZ=South Pacific Convergence zone.
SPCZ this week is expected to slowly develop from Solomon Islands to north of
Fiji area.

STR
HIGH is expected to travel east slowly across the Tasman Sea and then across to
east of NZ on Father's Day weekends (3 to 4 September).
There is expected to be a weak squash zone of enhanced easterly winds on the
north side of this HIGH between Sat 3 and Mon 5 Sep. May as well watch this HIGH
for departure/arrival.

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See my yotpak at boatbooks.co.nz/weather.html for terms used.
See my website http://www.metbob.com for information on tailor-made voyage
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