Heavy Rain Return to the Southwest U.S.; Potential Atlantic Tropical System Interaction

Heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding to the Desert Southwest into Sunday. The tropical wave (AL94) continues to bring heavy rainfall to Puerto Rico and the US Virgin Islands. The close proximity of Tropical Storm Humberto and AL94 could lead to interaction between them, but details of their track and intensity forecasts remain uncertain Read More >

Heavy rains of 8 to 12 inches that occurred on July 22-24 along and north of the Highway 20 corridor between Waterloo, IA and Dubuque, IA resulted in record flooding on the Maquoketa River and Lake Delhi (also called Hartwick Lake). The pressure from the record river flood levels were too much for an earthen berm on the south side of the Lake Delhi/Hartwick Lake Dam. It gave way shortly after 1 pm July 24.

48 Hour Rainfall Totals Ending ~7AM July 24

Hydrograph of the Maquoketa River Level at Manchester Highway 20

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Heavy Rain Return to the Southwest U.S.; Potential Atlantic Tropical System Interaction

July 22-24, 2010 Heavy Rain and Flooding