With the exception of a freak weather front, they can somewhat forecast the weather with some high accuracy these days with radar and human observation

Go to http://weather.noaa.gov/weather and go to the aviation routines, enter the local airport ICAO four letter identifier (KLAX not LAX, KMIA not MIA, or KPHL, …..) and this will give you a very accurate forecast as to what to expect that day from any airport in the world. There is some interpretation needed to understand the coding, and this site should help

http://www.met.tamu.edu/class/METAR/quick-metar.html

Note METARS (Aviation Routine Weather Report) are updated every hour, and TAF’s updated 4 time daily. If there is a freak event this in noted with a SPECI report issue ASAP. When planning my sailing day, I will look at the three airports near the area I will be sailing and with some interpolation I can get a strong idea as to what to expect. BTW – these are human and automated observations.

If there are any pilots on this group, you know the importance and the accuracy of these reports.