Apex Wx

Slight Risk of Excessive Rainfall From Central Plains to Tennessee Valley and Desert Southwest
Heavy rainfall and flash flooding are possible Wednesday across parts of the Central Plains, Midwest, Tennessee Valley, and Desert Southwest. Repeated thunderstorms may track along a stationary front from Iowa toward Kentucky, creating areas of training storms and rainfall rates exceeding two inches per hour. Where storms repeatedly pass over the same locations, rainfall could exceed five inches, especially where soils are already saturated. The exact location of the heaviest rain remains uncertain. Across Arizona, Utah, southern Nevada, the Great Basin, and Four Corners, widespread thunderstorms are expected as moisture and instability increase. Rainfall rates could reach one inch per hour and produce locally three inches of rain, with flash flooding especially dangerous in burn scars, canyons, dry washes, and urban areas.

Elevated Fire Weather Threat Expands Across the Southern Plains and Northern Great Basin
Elevated fire weather conditions are expected today across portions of the Southern Plains, Great Basin, and Upper Snake River Plain. In the Southern Plains, temperatures near 100 degrees, strong southerly winds, very low humidity, and increasingly dry vegetation will increase the risk of rapidly spreading wildfires across parts of Texas, Oklahoma, Kansas, Colorado, eastern New Mexico, and nearby areas. Some locations could see humidity below 10 percent. Farther northwest, showers and thunderstorms will develop across northern Washington, the Idaho Panhandle, and northwestern Montana, with some storms producing wetting rain but others posing a dry lightning threat. Dry, breezy conditions will also affect northeastern California, northwestern Nevada, southern Oregon, and southern Idaho, where humidity could fall below 10 percent.