Bob Blog 11 Dec

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 11 December 2022

CONGRATULATIONS TO TOM ROBINSON

Tom Robinson is in the process of rowing across the Pacific Ocean and
yesterday made landfall in Penrhyn, Northern Cooks,
completing over half the trip. He hopes to be the youngest ever to row the
whole way solo. We wish him good speed for 2023.

MAKE YOUR OWN WAVES

This week I was introduced to an interesting " indoor ocean" wave-making
pool at youtu.be/pir_muTzYM8

How do they compute the virtual waves in movies and video games?

The answer is Fast Fourier Transforms and Oceanographic Spectra. To give you
a taste of this complicated topic
see the you tube at www.youtube.com/watch?v=kGEqaX4Y4bQ

And you can experiment with you own wave maker with a Google Play app at

play.google.com/store/apps/details?id=com.SimulationisEvolution.OceanWavesSi
mulation&hl=en_NZ&gl=US


TROPICS
Tropical depression Twenty Nine is moving away from Philippines. There is a
zone of potential development near Fiji.

MJO
The GFS ensemble outlook for the remainder of December shows enhanced
convection of the MJO is expected to build in the Indian Ocean.
This may point to a late start to the South Pacific Cyclone season.


WEATHER ZONES
South Pacific Convergence Zone SPCZ
The SPCZ is expected to have a very active week all the way from Solomona
Islands and especially active from Samoa to Southern Cooks.
One tropical Low L1 is tonight near southern Tonga and expected to go
southwest peak close to the NE of Aotearoa NZ by mid-week and then go
southeast and fade.

HIGHS and LOWS
HIGH over 1032hPa to east of NZ and south of Tahiti tonight is expected to
travel off to the east and be replaced by H1 from the southwest . These
highs are keeping a northeast flow from the subtropics onto NZ.

Low L2 is expected to travel across Tasmania on Monday and go southeast into
the South Tasman Sea, followed by another low that deepens in the Tasman on
Wed/Thursday and then crosses central NZ early next week.

Tropical low L3 is expected to form around the southern Cooks by mid-week
and then go SW /S/SE and finally push H1 off to the east, signalling a
change in pattern.

There may be a reasonable voyage from Fiji/Tonga to NZ after mid-week. If
trying to cross the Tasman be ready to divert around the fronts.

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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/
Weathergram with graphics is at metbob.wordpress.com (subscribe/unsubscribe
at bottom).
Weathergram archive (with translator) is at weathergram.blogspot.co.nz.
Contact is bob@metbob.com or txt 64277762212
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