Bobgram 20K=July 2025

Bob McDavitt's ideas for sailing around the South Pacific. 20 July
2025
Disclaimer: Weather is a mix of pattern and chaos; these ideas are
from the patterned world.

Calving Icebergs

Authorities in Innaarsuit, a tiny village in northwestern Greenland,
warned residents to be cautious as a pair of massive icebergs loomed
just offshore. There were fears that the massive chunks of ice could
create large waves that could sweep ashore. Government photos show
towering wedges of ice overshadowing homes and businesses in the
village, which has fewer than 200 people and relies heavily on
fishing.

https://www.bbc.com/news/world-europe-44831663

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 Nari skirted the coast of Japan's Honshu Island before
becoming the first such storm to make landfall on Hokkaido since 2016

EATHER 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

Rain accumulation above shows well defined SPCZ between Solomon
Islands and northern Vanuatu, and convergence zones between Samoa and
Southern cooks. 

Also  dry zones over NW Australia , in Coral sea and over NZ.

Wind and rain accumulation this week from Windy.com

The wind accumulation shows a squash zone along 30S between 180 and
160E.

Also, a zone of light winds over New Zealand. NO

LOWS and HIGHS

FINALLY, and for the first time this winter, we have a winter HIGH
over New Zealand this week.  Light winds, often clear skies… good for
overnight frosts and valley fogs.

Low L1 near Norfolk on Monday is travelling east along 29S and taking
a trough/Convergence zone eastwards across Vanuatu on Monday then
Fiji/Tonga on local Wednesday then  Niue on local Wednesday and
Southern cooks on local Thursday 35S and 145W (to southeast of French
Polynesia) is travelling southeast and associated trough is expected
to pass by Tahiti late this week, bringing small squalls and then a
lull.

HIGH H1 crossing New Zealand is expected to develop a squash zone of
strong easterly winds on its northern side along 30S between 180 and
160E for a time.

Trough T1 crossing the Tasman Sea following H1 this week may stall
near 160E and fade.

HIGH H2 is expected to cross central Australia this week and fade over
northern Tasman Sea this weekend as a developing Low from Australian
Bight moves into South Tasman Sea by early next week.

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