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 Sunday 9 October 2022

Back in August I talked about Blaise Pascal's famous experiment showing how
air pressure changes with altitude at
metbob.wordpress.com/2022/08/29/bob-blog-28-aug/
During the 18th century barometers become useful as a tool for forecasting
weather on sailing ships
and then in the 19th century…. Robert FitzRoy introduced weather
forecasting to newspapers

Born 1805, Robert FitzRoy
Fourth Great-grandson of Charles II
Protégé of Francis Beaufort
Age 12: joined Navy Academy
Age 19: passed Royal Naval exams, first ever to achieve 100%.
Age 23: Made Captain of "The Beagle"
Age 26-31: Skipper of BEAGLE with Charles Darwin's famous voyage to
Galapagos
1843-1845 2nd Governor of NZ
1853: First International Meteorological Conference at Brussels
1854: Meteorological Statist to the Board of Trade.
1857: Christophorus Buys Ballot shows mathematically
that wind circulates around air pressure centres.
1859: Storm sinks the "ROYAL CHARTER".
"Origin of Species" published
Age 55: Rear-Admiral FitzRoy
Daily weather maps in 'The Times"
Age 58: Publishes "The Weather Book"
1865: decommissioned and takes own life

.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
Cyclone JULIA is about to travel from the Atlantic to the Pacific. Cyclone
BALITA is the second named storm of the 2022/23 South Indian Ocean season
which usually starts around 15 November. These cyclones have been confirmed
by scatterometer.

WEATHER ZONES
The SPCZ stretches from PNG across Solomons to Vanuatu and briefly visits
Fiji and Tonga. A low L1 is forming tonight south of Tonga and expected to
travel SE this week. Another Low L2 is expected to form near Vanuatu by
Wednesday and travel SE to be to NE of North Island by weekend. Avoid.

High H1 east of NZ tonight is travelling away to the ENE.

A trough tonight in the Tasman Sea is expected to weaken as it travels east
across Aoteroa NZ on Mon and Tuesday and linger over the north on Wednesday.

HIGH H2 is expected to follow this trough across the Tasman Sea on Tuesday
and cross the South Island on Wed and Thu, to then be to south of L2, with
enhanced easterly winds onto Coromandel/Gisborne. Avoid

L1 and L2 make travel between Fiji and NZ hazardous until after 14 October.

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If you would like more detail for your voyage, then check metbob.com to see
what I offer.
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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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