Re: [Paddlewise] Weather radio in Baja (ham and AM)

From: Craig Jungers <crjungers_at_gmail.com>
Date: Tue, 26 Aug 2008 23:08:21 -0700
Alex:

Hurricane season does not end in September... it ends November 15th and with
global climate change it could extend that. The good news is that hurricanes
no longer appear out of nowhere; they are detected as they are formed and
tracked and analyzed their entire lives. There is little mystery when one is
approaching.

The most common serious wind in the non-hurricane season is the "gulf
norther" which is caused by a thermal low over the Sea of Cortes being
filled by a high over inland CA, NV and AZ. The sea raised by a gulf norther
is typically short and choppy. For a long time it was a mystery how to
predict a gulf norther until about 1983 when the weather guys of the "baja
net" in California figured out the mechanics. You can tell if there will be
a gulf norther if the weather in the Sea of Cortes is hot and there is clear
weather north. A Santa Ana wind in So. Cal. will almost certainly indicate a
gulf norther in the Sea of Cortez. Gulf northers typically last 3 to 5 days
and there can be several in any winter month.

In order to receive SSB radio transmissions you will need a radio with
either a BFO or a product detector. If the radio has a switch for "morse
code" or "cw" or "ssb" or "lsb" or "usb" then you have one that will work
for the ham nets. Chubasco net is on 40 meters which is traditionally lower
sideband (LSB).

Amateur stations on sailboats typically run 100 watts input or about 50
watts output into tuned backstays (for sailboats, at least). This is usually
enough power to communicate several hundred miles under average conditions
at the time of the Chubasco Net. I used to be active on these nets in the
1980s and I could easily communicate with stations in southern California
and with sailboats all around the Sea of Cortes. The stations in So. Cal.
typically run 1,500 watts (full legal power for amateur radio stations and
have well tuned antennas. You should be able to hear their weather
forecasts.

The Chubasco Net typically uses amateur radio operators on sail and power
boats (and on land) scattered around the Sea of Cortes for weather reports
including barometer readings, wind speed and direction and temperature. The
weather operators in the USA use up-to-the-minute NOAA charts to give
predictions of weather.

Local weather (such as which corner of the cove the wind is blowing) are
impossible to predict. You won't hear that sort of information in the USA or
Canada either. But barometric pressures from numerous points can give you a
good idea of where the lows and highs are and this, along with the
information from the So. Cal. stations, can give you a good idea of what the
conditions are in the Sea. Local reports are the best for predicting a gulf
norther since that wind moves from north to south and stations north of you
will report it before it gets to you. And they can also report when it ends
for them while it is still blowing where you are.

I can't see why you wouldn't take the Kaito since it can also receive AM
stations and it is not *that* big. The benefits outweigh the drawbacks, in
my opinion.


Craig Jungers
Moses Lake, WA
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Received on Tue Aug 26 2008 - 23:08:30 PDT

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