Weather Underground midday recap for Monday, August 17, 2015

A low pressure system ejected across the central Plains on Monday, while a wet pattern persisted over the Deep South.

An area of low pressure deepened as it shifted east northeastward over the central Plains. Heavy rain and thunderstorms fired up across the central Plains and the upper Midwest on Monday. Flood warnings were issued in northwest Iowa. Fort Dodge, Iowa, reported a midday total of 2.88 inches of rain. Cherokee, Iowa, reported a midday total of 2.11 inches of rain. Showers and thunderstorms also developed across a large span of Montana.

Meanwhile, an onshore flow from the Gulf of Mexico initiated widespread rain and thunderstorms across the Deep South, the Southeast, the Tennessee Valley and the southern Great Lakes. Flood advisories were issued in southeast Tennessee and western Kentucky. Chattanooga, Tenn., reported a midday total of 2.47 inches of rain. Pensacola, Fla., reported a midday total of 2.13 inches of rain. High pressure kept conditions quiet across the Mid-Atlantic and the Northeast on Monday.

Out west, monsoonal thunderstorms began to fire up across the central and southern Rockies. A severe thunderstorm warning was issued in north central New Mexico. High pressure kept conditions dry to the west of the Continental Divide. Excessive heat warnings remained in place for western Arizona, southern Nevada and southern California. Las Vegas, Nev., recorded a midday high of 102 degrees.

Temperatures in the Lower 48 states Monday have ranged from a morning low of 30 degrees at Stanley, Idaho to a midday high of 106 degrees at Needles, Calif.