[aprssig] US Weather forecast via APRS message

Max Harper kg4pid at yahoo.com
Thu Jan 21 21:02:27 EST 2016

I look forward to trying out your new program. I use the National Weather Service at home and just a couple of hours ago when I checked the forecast it gave me a web page that was for yesterday.  Tried it on my phone and tablet and got the same thing. The point of this is to be sure to check that you are getting current information for these aprs messages. 
Good luck with your project.

      From: Martin Nile via aprssig <aprssig at tapr.org>
 To: aprssig at tapr.org 
 Sent: Thursday, January 21, 2016 6:03 PM
 Subject: [aprssig] US Weather forecast via APRS message
I am in the process of working on a program which provides a US Weather forecast via APRS message. I have most of the kinks worked out and it is ready for testingby 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 forecastadd the word "full" to your "where" and "when".  The full forecast is spread acrossmultiple APRS message.  The default "brief" forecast usually fits within a singlemessage.
"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 ofheavy activity, the weather service can take 20 or 30 seconds.
The latitude/longitude for the requested object is extracted from api.aprs.fi,  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 station.Tomorrow 96067    Returns  tomorrow's forecast for Mount Shasta, CATonight    Returns the forecast for tonight at your current locationTuesday night full    Returns the Tuesday night full forecast at your current location.w1aw    Returns the current forecast for the location of station W1AWusna-1 Sunday    Returns the forecast for the Army Navy football game on Sunday.     (Assuming usna-1 is at the stadium)CN81uh    Returns the forecast for the center of maidenhead grid CN81uh36.5786/-118.2920    Returns the forecast for the summit of Mount Whitney.
Currently the program is running on a raspberry Pi on a home dsl internet connection.The program is single threaded and can handle a single forecast request at a time.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 madethis easy.
For more information see: https://sites.google.com/site/ki6wjp/wxbot
--RegardsMartin NileKI6WJP

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