Weather Underground midday recap for Sunday, April 21, 2013.
Another spring storm developed over the Northern Rockies and Northern Plans with wintry precipitation on Sunday as a trough of low pressure moved eastward through the region. While this system carried less moisture than previous late season winter storms, plenty of cold air will accompany the system across the Upper Midwest. This cooler airmass allowed snow showers to blanket the higher elevations from the Pacific Northwest to the Northern Rockies and a mixture of precipitation to fall across the Upper Midwest. The heaviest amounts of precipitation were expected to remain over the Northern Rockies, while lighter and more scattered showers moved into the Upper Midwest. Snowfall totals over the Northern Rockies were expected to range from 2 to 6 inches, with 5 to 10 inches likely at higher elevations through Sunday evening. The Upper Midwest experienced snow showers, mixed with rain in the warmer hours of the middle of the day and afternoon., and snow accumulations of 1 to 2 inches. Meanwhile, an associated cold front trailed behind this system and moved into the Central Plains with chances of showers and thunderstorms.
In the East, a ridge of high pressure maintained dry but cool conditions across the Eastern Valleys and East Coast. To the south, the tail end of a frontal boundary lingered over the Florida peninsula and allowed for more scattered showers and thunderstorms to continue throughout the day.
Temperatures in the Lower 48 states Sunday have ranged from a morning low of 5 degrees at Mt. Washington, N.H. to a midday high of 89 degrees at Palm Springs, Calif.