Bob Blog

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 Sun 30 Aug 2020

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The climate start to SPRING in  the Southern Hemisphere is 1 September, but I like to wait until the equinox on Sep 22 (this year).

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The Tropics

The latest cyclone activity report is at tropic.ssec.wisc.edu and Tropical Cyclone Potential is from www.ssd.noaa.gov/PS/TROP/TCFP/index.html

The latest death toll due to LAURA in Louisiana and Texas is 16 (many from Carbon Monoxide). At present there are two cyclones , ISELLE, west of Mexico, and MYSAk which seems to be heading for Korea. There are several areas of high potential for formation, especially in the Atlantic.

 

WEATHER ZONES

SPCZ=South Pacific Convergence zone.

SPCZ is moderate and in its normal position from PNG to Vanuatu/Tuvalu and, occasionally, Samoa.

Passing trough over Tonga on Wednesday (local) reaching Southern Cooks on (local) Friday, associated with a Low further south..

 

Subtropical ridge (STR)

RIDGE 1020hPa near 30S in north Tasman Sea, fading on Monday/Tuesday.

New High 1024hPa in Tasman Sea on Tues , travels along 35S crossing northern NZ on Fri/Sat.

 

Tasman troughs

Vigorous westerly winds south of 40S, then trough followed by cold southerly flow reaching South Island by Tuesday and north of North island on Wednesday.

Next trough over New South Wales by Friday, increasing the westerly flow over the south Tasman again.

 

From Panama: ITCZ 5N to 10N, SW winds in Panama, winds W/SW from 7N 80W to 90W.

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