Bob Blog 30 Jan

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 30 January 2022

Some interesting recent weather clips:
Antarctic Ice see: www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=304293

A MOAT of low pressure.
On weather maps you have probably heard of HIGHS and LOWS, TROUGHS and
RIDGES and may be of a COL. Have you heard of a MOAT?
A weather map in illustrated edition at
metbob.wordpress.com/2022/01/30/bob-blog-30-jan/ shows a "heat low" over the
North Island during a hot summer's day splitting the HIGH crossing the
country into two. A fairly common pattern.
If we zoom in on that weather map an interesting pattern is shown, with a
MOAT of low pressure over most of the central North Island and an island of
higher pressure over Lake Taupo. This is a reasonable representation, for
Lake Taupo is not likely to warm as much as the surrounding land, and thus
should hold cooler denser air over it as shown by slightly higher pressure.

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
TC BATSIRAI in the Indian Ocean is expected to be a severe system on Monday
when it passes to north of Rodrigues heading for Madagascar. There are zones
of potential formation in the Coral Sea and around NW Australia.

WEATHER ZONES
SPCZ=South Pacific Convergence zone.
The SPCZ remains active from Solomons to Vanuatu/Samoa to Southern Cooks.

HIGHS and LOWS
Subtropical Low L1 south of New Caledonia is expected to go South-southwest
across the Tasman Sea.

HIGH H1 over central New Zealand is expected to travel east and then
northeast.

Low L2 is expected to form on the northwest shoulder of H1, south of Niue,
by mid-week and then go southwest and fade over North Island by end of the
week.

Meanwhile tropical Low L3 is expected to form in the Coral Sea by Tuesday
and then travel across Vanuatu and to southeast of New Caledonia by end of
the week.

High H2 is expected to move from Aussie Bight to south Tasman Sea after
mid-week

If planning a trans-Tasman trip , avoid L1 next few days and beware of L3
next week.

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If you would like more details, 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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