HF weatherfax broadcasts consist of two tones-a tone for a black level and a different tone for a white level. The transmission is a digital representation of the original weather chart. You can find the lists of transmitters, frequencies, and times in various reference books such as Reed’s Almanac and, for example, on the Internet at Just like the fax machine in your office (and in many homes), the broadcast station sends out a facsimile of the weather chart. To receive these broadcasts, you need a shortwave receiver or a frequency-tunable SSB radio. The broadcasts are on the HF shortwave bands between 10 meters and 80 meters (3.5 MHz to 30.0 MHz) and are broadcast on the upper sideband (USB). Other countries also broadcast weatherfax information. In the US, HF weatherfaxes are weather charts and forecasts from the National Weather Service, broadcast by the US Coast Guard for ships at sea. His technique is still the basis for the HF weatherfax information we use today. In that year, Charles Francis Jenkins, together with the US Navy, broadcast the first weather maps from Arlington, Virginia to ships at sea. It’s hard to believe, but high frequency (HF) weatherfax has been around since 1926.
Instead of his usual self-assured mother-hen delivery, he seemed to be holding back a little.
Once we were sailing from Bermuda to Antigua and listening closely to Herb on Southbound II give his synopsis of what we could expect for weather.
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