UPDATED at 4:30 PM
Tonight: Partly cloudy with a 40% chance of showers/storms. Low: 71-74. Wind: W 5-10 mph.
Tuesday: Partly cloudy with a 60% chance of showers/storms. High: 87-92. Heat Index: near 100. Wind: SW 10-15 mph.
Tuesday Night: Showers/storms end in the evening then clearing overnight. Low: 67-71. Wind: W 5-15 mph.
Wednesday: Mostly sunny. High: low 80s.
Thursday: Mostly sunny. High: low 80s.
Friday: Mostly sunny. High: mid 80s.
Saturday: Partly cloudy. High: low 80s.
Sunday: Partly cloudy with a 20% chance of showers/storms. High: mid 80s.
Monday: Partly cloudy with a 20% chance of showers/storms. High: mid 80s.
The humidity level is going to remain high through Tuesday night. Dewpoints are forecast to be in the upper 60s and low 70s during this time. Dry air is forecast to move into the area Wednesday with dewpoints in the upper 50s and low 60s…much more comfortable.
There is a stationary front across Iowa this afternoon and along it isolated showers/storms are possible this evening. A severe storm is possible if they develop this evening. Here is the area of concern.
The stationary front will not move much at all tonight. There is a potential for a cluster of storms to develop over South Dakota later tonight. If they do develop the forecast path takes them south and east across Iowa late tonight and come to an end early Tuesday morning. Here is the surface map this afternoon
The Storm Prediction Center outlines a slight risk of severe weather for tonight and Tuesday across Iowa.
The chance of severe weather Tuesday afternoon and evening is highly dependent upon what the storms (if any) tonight do. If they develop tonight the question is: how fast does the rain end and how fast does the cloud cover clear Tuesday morning. The longer the rain/clouds linger the less of a chance of severe weather in the afternoon. If no storms develop tonight or if they do and end around sunrise with lots of sunshine during the day…the chances of severe weather increases during the afternoon as the cold front approaches from the west.
Here is the rain forecast for Monday evening to Wednesday evening.
Once the front and storms push away from the area Tuesday night, cooler and less humid air will move into the Midwest with a large area of high pressure. Dry weather is forecast to continue through Saturday. Here is the forecast position of the high Friday morning.
There is a slight chance of showers/storms Sunday and Monday with the passage of a cold front.
Posted under Forecast Discussion
This post was written by Schnack on July 8, 2013