A cold frontal boundary brought active weather to the northern tier of the country on Sunday, while Post-Tropical Cyclone Hermine affected the Mid-Atlantic.
A cold frontal boundary stretched west southwestward from the northern Plains to the Great Basin. As this frontal boundary transitioned eastward, it generated strong to severe thunderstorms from the Intermountain West to the upper Midwest. Devils Lake, N.D., reported a midday total of 1.86 inches of rain. New Salem, N.D., recorded wind gusts of 60 mph. Cool air trailed this frontal boundary, which supported a mixture of rain and snow in the higher elevations of the northern Rockies. Winter weather advisories were issued for western Montana and eastern Idaho. Stanley, Idaho, recorded a morning low of 27 degrees. Meacham, Ore., recorded a morning low of 28 degrees.
Meanwhile, isolated monsoonal thunderstorms popped up across the lower Intermountain West and the high Plains. Severe thunderstorm warnings were issued in eastern Colorado. Flood warnings were also issued in northwest Kansas. Hill City, Kan., reported a midday total of 2.27 inches of rain.
Tropical moisture from the Gulf of Mexico lead to the development of rain and thunderstorms along the Gulf Coast and into the Southeast. Flood advisories were issued for the western edge of the Florida Panhandle and across the northern tier of the Florida Peninsula. Panama City Tyndall Air Force Base, Fla., reported a midday total of 3.74 inches of rain.
Post-Tropical Cyclone Hermine continued to affect the northern Mid-Atlantic and southern New England in the form of dangerous storm surge, gusty winds and scattered showers. Tropical storm warnings remained in effect from eastern Maryland to southern Connecticut on Sunday.
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