Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Excessive Heat Watch Sunday into Monday.

Weekend Heat Index Forecast

Severe Storm Risk Sunday

Recap of July 20th Thunderstorms

Heat and humidity will build over the weekend, possibly becoming dangerous by Sunday afternoon. The heat will linger into Monday. An Extreme Heat Watch has been issued for portions of eastern Iowa, far western Illinois, and northeast Missouri from Sunday afternoon through Monday evening for the potential of Heat Index readings of 100 degrees or higher.

Here is the latest forecast for Heat Index reading trends through the weekend.

There will be the chance for strong to severe thunderstorms to develop and move into the area late Sunday and especially Sunday night. Feeding on high heat and humidity, these storms will be capable of producing damaging winds and heavy rainfall. There is a Level 2 out of 5 Risk for severe storms north of Highway 30, while the rest of the area is in a Level 1 out of 5 Risk for severe weather Sunday.

Two lines of thunderstorms moved through eastern Iowa and western Illinois on Monday. The first round had up to 3.5 inches of rain and damaging winds, while the afternoon round had damaging winds, including a few significant gusts of 70-74 mph. Summary list of all severe and rain reports: https://mesonet.agron.iastate.edu/wx/afos/p.php?pil=LSRDVN&e=202607210348

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Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

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