Bob Blog 1 May

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 01 May 2022

REVIEW OF THE LAST MONTH (April 2022)
Sea surface temperature anomolies: the cool eddies along the eastern
equatorial Pacific that signify LA Nina are still there. 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. And the Gulf stream is lit up like the stars and
stripes.

The subtropical ridge in the northern Hemisphere has strengthened since
last month.
The anomaly map shows more lows than normal over Australia and a weakening
and shifting to the north of the anomalous Highs over southern NZ. The North
Atlantic has swapped from High to Low.
Maps show that the subtropical ridge has sifted north and weakened, as shown
by the 1015 over Australia/NZ, and the fading of the 1025 off South America.
The Antarctic High has increased to over 1040 .

Tasman Sea Time-latitude pressure map from PSL for April shows Cyclone Fili,
6 Highs and 5 southern lows in 4 weeks

TROPICS
JASMINE was a late season cyclone that faded over Madagascar last week.
There are no cyclones around at present and the Southern Hemisphere cyclone
seasonal is now nominally ended.

WEATHER ZONES
SPCZ=South Pacific ConvL1ergence zone.
The SPCZ stretches from PNG to Vanuatu to Fiji/Tonga.
Another convergence zone is lingering south of Tahiti.
The best route this week from Tahiti to Tonga seems to be the northern
route.
HIGHS and LOWS
Low L1 is forming between Fiji and southern Tonga and expected to travel
southeast this week.
High H1 is a blocking High east of NZ travelling slowly east along 42S
holding a ridge over central NZ
This should help maintain easterly winds between NZ and Fiji.
Towards the end of this week the next low is expected to travel into the
south Tasman Sea form the west and another may form in the Coral Sea. These
may combine to help anyone planning to sail eat from Australia
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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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