Thursday, August 30, 2012

Midwest Braces for Isaac's "Leftovers"

Late this afternoon Tropical Depression Isaac was located near the Louisiana/Arkansas line. moving in a northerly direction at about 12 mph, twice the speed it was moving yesterday.  Isaac left up to 20 inches of rain behind in Mississippi and Louisiana, and those areas can expect more rain in the next two days. CoCoRaHS observers in Hancock County, MS near Kiln reported 24-hour rainfall totals of 14.18 and 13.89 inches. This was on top of 2.8 inches received the day before. In Tangipahoa Parish in Louisiana the CoCoRaHS observer at LA-TG-2 near Hammond reported 11.00 inches this morning. Observations in southern Louisiana were few and far between because of the flooding and power outages.
This is a map of the 24 hour precipitation accumulation produced by combining radar and rain gauge measurements. Source: NWS Advanced Hydrologic Prediction Service

Now the Midwest is bracing for Isaac's rain.  A flash flood watch is in effect for much of Arkansas, and will probably be extended through Missouri and Illinois tomorrow and Saturday. The forecast track of Isaac has varied a little over the last 24 hours, but the axis of heavy rain is still likely to be an area from Arkansas through most of Missouri, Illinois, Indiana, and Ohio. Generally 3 to 6 inches of rain can be expected, with some locations receiving more. Some of the squalls will be accompanied by strong gusty winds, and a few severe thunderstorms are not out of the question.

Forecast track for Isaac issued at 4:00 p.m. CDT
Quantitative precipitation forecast for August 30-September 4

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