Bobgram 10 Aug

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 10 August 2025
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 development across the Northern Hemisphere increased,
with Typhoon Krosa and Tropical Storm Bailu churning the western
Pacific.
. Hurricane Gil formed off Mexico, while Tropical Storm Henriette
passed northeast of Hawaii.
. Tropical Storm Dexter spun up over the Atlantic.
WEATHER ZONES
Weather Zones Mid-week GFS model showing isobars, winds, waves
(purple), rain (red), MT (Monsoonal trough), STR (Subtropical Ridge),
SPCZ (South Pacific Convergence Zone) CZ (Convergence Zone)

Rain accumulation this week from Windy.com shows well defined SPCZ
between Solomon Islands and Tuvalu. Also, heavy rain along 25S from
175E to Rarotonga (avoid).

Wind accumulation from windy.com shows zones of strong wind around L1.
There are also bursts of wind expected south of New Caledonia and off
Sydney later in the week. (avoid).

LOWS and HIGHS
Low L1 is deepening near New Caledonia tonight and expected to travel
slowly to East-southeast reaching 29S 175W by mid-week.
Another Low is expected to form between New Caledonia and Norfolk by
Friday and trave to Tonga 16/17 August (avoid).
HIGH H1 is expected to travel steadily east along 35 to 40S, starting
this week west of Perth, reaching Adelaide by Mid-week and crossing NZ
on Friday 15 Aug.
By then there may be a squash zone of strong easterly winds around 30S
between the High over NZ and the new Low then near Fiji. Avoid.
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Weathergram archive (with translator) is at
weathergram.blogspot.co.nz.
Contact is bob@metbob.com or text 64277762212.
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