Monday, 15 April 2013

More heavy rain for the nations midsection

More heavy rain for the nations midsection, Very similar to last week, a broad upper level trough will form over the Rockies. This will develop a very moist and warm flow ahead of it, and this warm and moist air will overrun a stationary front through the Midwest into the Plains. The big difference with this system is that the surface low pressure will move farther north through the Midwest. The graphic shows the expected average rainfall over the nation through Friday evening. Once again there is a very broad swatch of 2+ inches over the Midwest and Great Lakes, with local 3+ inch amounts.

For the Chicago metro area it was like somebody just flipped a switch. We went from the chill and wet the last two days to sunny and warm today, Sunday. From a high of only 45 on Saturday to around 70 today. It just took a switch in wind direction along with the now fairly strong mid April sunshine. The warm air is ahead of an approaching low pressure system and cold front. A little cooler air will move in Monday, and much cooler Tuesday and Wednesday with a chilly wind off the lake.

By Tuesday evening the front will have stalled out from northern Oklahoma to just north of the Ohio river. Showers and storms will develop from time to time near the front. The front will begin to move north during Wednesday and on Wednesday low pressure will develop along the front and move from northern Texas to northern Illinois by Thursday morning. By Friday chilly Canadian air will once again invade the center of the nation.

The metro area will see showers and maybe a thunderstorm very late tonight into Monday morning. Showers and storms will then move through from time to time Tuesday, increasing in coverage and intensity later Wednesday into Thursday. As of right now the severe weather is expected to hold to the south through Wednesday. By Thursday it may be much closer. Average rainfall through the period will be from 2 to 2.5 inches.

No comments:

Post a Comment