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Bob McDavitt's ideas for sailing weather around the South pacific

29 January 2017

Bob blog 29 JAN 2017

WEATHERGRAM
YOTREPS
Compiled Sun 29 January 2017

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.

The Tropics in the South Pacific/Australia region are starting to show signs of
life, with a Tropical depression today off the NW of Australia travelling West
and then likely to go WSW into Indian Ocean.
There is a pulse of extra convection now in the Indian Ocean and travelling
eastwards towards Australia. This is a Madden Julian Oscillations. It is
expected to weaken as it moves across Australia next few weeks but may intensify
when it reaches South Pacific by mid-February. This area of enhanced convection
shows as a bubbly blue area in the OLR (Outgoing Longwave Radiation)
extrapolations that may be seen at
www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/mjoupdate.ppt

We can see the enhanced rain in the Indian Ocean that is associated with this
MJO in the past two weekly rain maps at
trmm.gsfc.nasa.gov/trmm_rain/Events/big_global_accumlation.gif. One trend shown
by these two maps is the burst of heavy rain two week ago near Tahiti (by a
passing depression), now relaxing. Also, we can see that the ITCZ is
intensifying near Indonesia and Majuro.

WEATHER ZONES
SPCZ=South Pacific Convergence zone.
SPCZ is expected to stretch from Solomons to Southern cooks.
A topical depression is expected to form to south of French Polynesia on weekend
of 4/5 Feb local. Later this month we can expected deeper developments so if you
want to avoid cyclones and Island hop, then this is your week, and no later.

Subtropical ridge (STR)
Highs near 35S over northern NZ for Auckland Anniversary weekend is expected to
move off to the east during the week.
For Waitangi Day-weekend a High is expected to travel east across central NZ on
Sat/Sun followed by a ridge over northern NZ on Monday. Bon chance.

Tasman Sea/NZ Area troughs.
A front is expected to travel NE across South Island on Tuesday and Wednesday,
then stall and fade over southern North Island on Thursday. This is followed by
a southern dip in the Sub tropical ridge/ STR
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