DES MOINES, Iowa — We are watching for storms to fire up this evening and bring the threat of severe weather to parts of the state.
Flash flooding is also a concern. A Flash Flood Watch is in effect from 7 PM through 7 AM Wednesday. Storms will produce heavy rainfall with 1 to 2″ possible in short periods of time. Localized street flooding will occur during those downpours.
A renewed threat for Severe Thunderstorms appears to be developing this evening for areas south of I-80, especially in SW Iowa, and then eventually to the east.
Skies have cleared out at least partially south of the interstate, and temperatures have soared into the upper-80s and low 90s. Dewpoints in the area are around and oppressive 77 to off the scale 80 degree readings, pushing the heat index to 105+ in some spots.
This combination of heat and moisture has almost completely removed the cap on thunderstorms in southern Iowa (particularly SW Iowa as of this update) and we will likely see strong storms develop as soon as a sufficient push arrives to fire things up.
A cold front is still in Eastern Nebraska this afternoon. Once it pushes into Western Iowa, it will likely lead to the development of more storms, some of which may be severe. These storms could produce some large hail, damaging winds and an isolated tornado.
After the front moves through, we will have cooler and calmer weather. Temperatures on Wednesday will be in the mid 80s with mostly sunny skies.