Snow Across the Great Lakes, Central Appalachians, and Northeast; Unsettled Weather in the West

Light to moderate snow will continue into Saturday over the Great Lakes, Central Appalachians, and Northeast. This weekend into next week, a series of atmospheric rivers will bring gusty winds, periods of heavy rain, and mountain snow to northern California and the Pacific Northwest. Colder temperatures are in store for the weekend from the Great Lakes to East Coast. 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 Mexico 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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