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Weather Market Commentary
Friday, July 30, 2010
Expected thunderstorms have fired this morning in northwestern parts of the Corn Belt, and when one combines those rains with rains that fell during the day yesterday, we have seen some locally heavy rainfall totals of two inches or more for southeastern South Dakota and parts of northwestern Iowa (and several counties there were under flash flood warnings early on this Friday).
This activity will tend to weaken after sunrise this morning as it moves to the east or a bit to the southeast, with fresh thunderstorms possible for this afternoon and tonight anywhere over the western two-thirds of the Corn Belt (stronger thunderstorms targeting the Missouri River Valley). We may not see all that much rain around the Midwest for the weekend, but by Monday morning there will likely be new thunderstorms into the northwestern Corn Belt.
The frontal system responsible for those rains shows signs of wanting to sag into the Midwest and become east-west oriented, so there may be rain chances around especially northern and western parts of the Midwest into the middle of next week. Heat for the Delta and the southern Plains still looks to be a big story for the weekend and into a good part of next week. Temperatures in those areas will be a notch warmer today, and for tomorrow we will see some places getting to the 100 degree mark.
That will start a string of days that will last at least into the middle of next week in which highs at or above 100 degrees are going to be possible for those areas. For the Midwest, any highs this weekend above 90 look to be in far southern parts of the region and in areas west of the Missouri River. We will see that heat creep a little further northward for Monday/Tuesday/Wednesday, but rain chances will keep that heat from dominating the heart of the region.
Overall for the Midwest, the real chances for sustained 95+ degree heat next week would be largely for areas along and south of Interstate 70.
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