Metar is a collection of text files containing weather information in a standardized format located here on the NOAA website: [url removed, login to view]
Extract the data from 6 given locations (which looks like this:
MMLP 211943Z 00000KT 12SM FEW045 35/26 A2980 RMK 8/500
Create a Graphic display that shows:
Temp/Wind/Direction/Barometer/(Rise or fall optional)/humidity/heat index as numeric output on a graphic and sky conditions are a selection of graphic associated with the variable. Sky conditions with different image for day/nite optional. (ie sun with clouds or moon with clouds. (moon phase not important))
Output suggested in Flash, but provide best solution. A sample of a similar images is included but 3 of the data sets are displayed on each of 2 maps.
3 additional locations can be interpolated from nearby cities (+/- 3°F)
I have attached a sample of similar output and a PHP file that parses the text file into readable data. This is a raw sample that delivers text only output, but provides a starting point.