Weather Underground midday recap for Saturday, July 23, 2016
Stormy weather impacted the north central portion of the country on Saturday, while dangerous heat persisted from the Southwest to the Mid-Atlantic.
An area of low pressure moved east northeastward across the northern Plains and south central Canada. A cold frontal boundary associated with this system collided with hot and humid air, which lead to the development of rain and thunderstorms. Heavy rain and strong to severe thunderstorms battered the northern Plains and the western edge of the Midwest. Severe thunderstorm warnings and flash flood warnings were issued in parts of southern Minnesota. Flash flood warnings were also issued in northeast Iowa and southwest Wisconsin. Prairie Du Chien, Wis., reported a midday total of 3.46 inches of rain. Austin, Minn., reported a midday total of 2.25 inches of rain. Another frontal system brought strong to severe thunderstorms to the Northeast. Severe thunderstorm warnings were issued for Upstate New York. High pressure kept extreme heat in place across a large span of the Plains, the Midwest, the Deep South and the Mid-Atlantic. Little Rock, Ark., recorded a midday high of 96 degrees with a heat index of 114 degrees.
Meanwhile, moisture-rich air and daytime heating triggered isolated thunderstorms across portions of the Southeast and the Deep South. To the west, a high pressure system ushered monsoonal moisture over the Southwest. This moisture and daytime heating initiated isolated storm across the Four Corners. Excessive heat warnings and heat advisories stayed in effect for parts of southern California and Arizona as a result of high pressure. Bullhead City, Ariz., recorded a midday high of 109 degrees, while Needles, Calif., recorded a midday high of 108 degrees.
In the eastern Pacific, Tropical Storm Darby approached the Big Island of Hawaii. Tropical storm warnings and flood advisories were issued for the island chain. Hilo, Hawaii, reported a midday total of 1.44 inches of rain.
Temperatures in the Lower 48 states Saturday have ranged from a morning low of 30 degrees at Truckee-Tahoe, Calif. to a midday high of 109 degrees at Bullhead City, Ariz.