re: Tornado! Bama - State of Emergency - High Risk Portions of GA & SC

I let my ATL friends know yesterday about todays threat.

I missed out on a Tornado by about 40 miles yesterday. Goodman, MO was struck head on.

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What does that mean RDS?

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DISCUSSION...GPS PW data are exhibiting a low bias by at least 0.5 
inch from parts of AL into GA, which has influenced initialization 
of the latest numerical weather prediction guidance.

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GPS data is put through radio occulation to measure the Doppler shift in the GPS data to determine atmospheric moisture content. Simple version, they can us GPS data to tell models how much water is in the air. That isn't working properly today and it is f'ing up the models.