While all eyes continue to watch Tropical Storm Isaac in the Gulf of Mexico, we in the Upper Mississippi Valley are looking ahead to the end of the week when that storm may get close enough to actually impact our weather. At this point, the National Hurricane Center’s five day cone forecast spreads the potential of rain in our direction by Friday night or Saturday morning. With that said, the probability seems somewhat remote as it appears Isaac will first weaken to a tropical depression by Wednesday after making landfall in the Gulf coast Tuesday evening, and then begin to move eastward by the time it moves as far north as the mid Mississippi Valley around St. Louis. The best case scenario as suggested by some computer model runs over the weekend, was for Isaac to produce some scattered thunderstorms in far southeastern Minnesota, southern Wisconsin, and through Chicago on its northern flank. Right now that doesn’t look as likely, but it’s not completely impossible, so we will be watching, waiting, and hoping for some rainfall from this storm system. The current rainfall deficit for north Iowa for the past year is around 10 inches and that area is in Extreme Drought while southern Minnesota is under Abnormally Dry to Moderate Drought conditions with deficits for the summer around four or five inches.
Posted under Tropical weather
This post was written by tschmidt on August 27, 2012