Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

July 22-24, 2010: Heavy Rain & Flooding

Ring-of-Fire Storms and Floods

72 Hour Precipitation Map ending at 7:00 am Sunday
Map of 72 hour precipitation ending on July 25

Meteorological Setup:

A large sub-tropical ridge developed early in the week across Texas and drifted east towards the Southeastern United States. (Fig. 1) As the 500hPa ridge drifted east, a series of weak low pressure systems traversed the Central Plains northeast into the Upper Midwest. A by-product of the 500hPa positioning on 22Jul2010, was a steady feed of Gulf of America moisture to the Northwest of the ridge. (Fig. 2)

Strong convective activity is commonly found when subtropical ridges occur, especially during the warm seasons. Galarneau and Bosart (2006) coined the term "ridge rollers" for convective systems

500hPa Ridge 20Jul10-24Jul10
Figure 1. 500hPa-ridge across the Southwest United States becoming centered across the Southeast United States 22July 2010.

Figure 2. GFS Precipitable water anomalies.

Total Rainfall
Figure 3. Multi-sensor estimated rainfall for the period of 21-24 July 2010.

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