[aprssig] US Weather forecast via APRS message

Fred Hillhouse Jr fmhillhouse at comcast.net
Fri Jan 22 09:42:26 EST 2016

Hi Martin,


Very nice! Now to remember it exists and that will be challenging!


Will you be making your work available for others to use?


Thanks for your service!


Best regards,

Fred N7FMH




From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Martin Nile via
Sent: Thursday, January 21, 2016 7:03 PM
To: aprssig at tapr.org
Subject: [aprssig] US Weather forecast via APRS message


I am in the process of working on a program which provides a US Weather

via APRS message. I have most of the kinks worked out and it is ready for

by a larger group.


Send a single character APRS message to KI6WJP and the program will respond
with a 

brief forecast for your location.


You can specify "where" and "when" you want the forecast.  If you wish a
full forecast

add the word "full" to your "where" and "when".  The full forecast is spread

multiple APRS message.  The default "brief" forecast usually fits within a



"where" is any APRS callsign/object, zipcode, grid, or decimal lat/lon as
long as it is 

located in a place covered by the US National Weather Service.


"when" is any day of the week with optional night.  I.e. Wednesday night


The forecast is derived from the US National Weather Service point forecast.

Usually the forecast is produced within 1 or 2 seconds, but during periods

heavy activity, the weather service can take 20 or 30 seconds.


The latitude/longitude for the requested object is extracted from

As a result, anything that appears on aprs.fi is valid including 

CWOP stations and AIS ships.


Here are some example forecast requests that can be sent to KI6WJP:


Any message less than 3 characters

    Returns a brief forecast for the current location of the sending

Tomorrow 96067

    Returns  tomorrow's forecast for Mount Shasta, CA


    Returns the forecast for tonight at your current location

Tuesday night full

    Returns the Tuesday night full forecast at your current location.


    Returns the current forecast for the location of station W1AW

usna-1 Sunday

    Returns the forecast for the Army Navy football game on Sunday. 

    (Assuming usna-1 is at the stadium)


    Returns the forecast for the center of maidenhead grid CN81uh


    Returns the forecast for the summit of Mount Whitney.


Currently the program is running on a raspberry Pi on a home dsl internet

The program is single threaded and can handle a single forecast request at a

Things are still in development and may break at any time.  


Obviously for this to work via RF, a transmit capable i-gate is necessary.


Many thanks to Heikki for Ham::APRS::IS, Ham::APRS::FAP and api.aprs.fi that

this easy.


For more information see: https://sites.google.com/site/ki6wjp/wxbot




Martin Nile



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