Weather.gov the National Weather Service's (NWS) Internet data source. This site is excellent because you can find:
In-depth Forecast Discussions on the weather picture, not just cute little icons of clouds and smiling suns. These often offer guidance from the local NOAA weather office as to which computer model (AVN, RUC or ETA etc) they feel is most accurate for the current conditions. State Forecasts and the more area specific Zone Forecasts

Pick your area from the list of all 50 states by List or Map, examples: GA ... TN ... AL

Example Forecast Discussions: GA ... TN ... AL
Example Zone Forecasts: GA ... TN ... AL
Example State Forecasts: GA ... TN ... AL

National Weather Service Southern Region, Huntsville, AL, Chilhowee TN

NWS Hourly Forecasts: Peachtree City, GA

Alabama Weather Page

TWC Aviation, TWC 5,000 Foot Winds Aloft

TWC City Forecast Examples: Atlanta .. LaGrange, GA .. Columbus, GA .. Cordele, GA .. Kingston/Etowah Bend, GA .. Birmingham, AL .. Huntsville, AL .. Auburn, AL .. Chattanooga, TN .. Knoxville, TN .. Benton/Chilhowee, TN .. Whitwell, TN

Intellicast city forecasts include forecast winds. examples: LaGrange, GA .. Atlanta, GA .. Monroe, GA .. Cordele, GA .. Peachtree City, GA ..Birmingham, AL .. Montgomery, AL .. Huntsville, AL .. Knoxville, TN .. Benton, TN .. Chattanooga, TN .. Whitwell, TN .. Greenville SC ..Columbia, SC.. Jacksonville, FL

CNN City Forecast Examples: LaGrange, GA .. Columbus, GA .. Monroe, GA .. Cordele, GA .. Thomasville,GA .. Atlanta, GA .. Chattanooga, TN .. Benton, TN .. Jasper TN (near Sequatchie Valley) .. Birmingham, AL .. Huntsville, AL

Unisys Weather has City forecasts too.

wgnx[dot]com weather 7 Day! forecast for Atlanta. (Believe it or not), but it has a nice radar image with interstates.

Atlanta Regional Precipitation Image - a good way to see how much rain has fallen over your thermal sources in the last 24 hours

Launch Code CHA LGC

Unisys Weather: Aviation 4 Panel Plots These are a great source for many different sides of the weather forecast picture. Winds, Precipitation, Instability.... These go from 6 to 72 hours. Examples: Initial ... 12 hr ... 24 hr ... 3 day ... also Aviation 500mb plot

Super Weather Charts from Flight Central http://www.flightcentral.net/superwx/

Unisys Weather: NGM MOS Meteograms These are a great forecasting resource for seeing how the weather will change in 3 hour increments. A meteogram is a 60 hour time cross-section of NGM MOS data for a specific surface reporting station. The data plotted include temperatures, winds, pressure, clouds and present weather. These plots are updated once every 12 hours at around 12:45 EST. The winds data are very useful for Ridge Soaring. The graph showing how and when the pressure changes is very telling for Thermal forecasting.
Examples: Atlanta GA ... Birmingham AL ... Nashville TN ... Greensboro NC

Surface Analysis Meteograms are the same idea but they look at the PREVIOUS 25 hours in 1 hour increments. A good way to review what happened on your last flight.

RUC MAPS 20-km RUC/MAPS real-time analysis/forecast images - good images that are updated frequently. Good wind forecasts - especially for ridge lift forecasts.

IGES: Short Range Aviation Model Forecasts ... Short Range ETA Forecasts ... Medium Range MRF Forecasts ...

National Jet Stream Chart from Intellicast ... Forecast Jet Stream Position from WeatherBank

Winds and Temperatures Aloft (FD) from AWC

Unisys NAM 300 mb Plot

Jet Stream Analyses & Forecasts at 300 mb

Windmapper SouthEast FL