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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 >

Heat and humidity will build over the weekend with peak heat indices over 100 degrees likely on Sunday and Monday! An Extreme Heat Warning is in effect for most of the outlook area on Sunday, with an Extreme Heat Watch area-wide on Monday.
Here is the latest forecast for Heat Index reading trends through Monday (7/27).
Scattered storms are possible later Sunday, mainly overnight. Confidence remains low on areal coverage, but with an unstable air mass in place a few of the storms could be strong to severe. The primary concerns are localized damaging winds, frequent lightning, and heavy downpours.