Heavy to Excessive Rainfall in the Central Appalachians; Severe Weather in the Mid-South; Hot Weather in Southern California

Heavy to excessive rainfall may lead to flooding today over southwest Pennsylvania into northern West Virginia, and western Maryland. Severe thunderstorms are possible this afternoon and evening in the Mid-South and across Eastern North Carolina. An extended period of hot weather is forecast for parts of coastal southern California including Los Angeles from today through Thursday. Read More >

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Figure 12: ETA 12 Hour Forecast of Surface to 3 kilometer Helicity
and Boundary Layer Wind valid 1200 UTC May 12, 1997.

Figure 13: ETA 18 Hour Forecast of Surface to 3 kilometer Helicity
and Boundary Layer Wind valid 1800 UTC May 12, 1997.

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Heavy to Excessive Rainfall in the Central Appalachians; Severe Weather in the Mid-South; Hot Weather in Southern California

GEMPAK Helicity