Weather Underground midday recap for Tuesday, April 16, 2013.
Wintry weather continued for the West on Tuesday, while showers and thunderstorms formed in the Central and Eastern U.S.
In the West, an upper trough of low pressure dropped southeastward into the Intermountain West, allowing energy in the Desert Southwest to advance toward the Southern Rockies and cold air to pour into the Intermountain West from the north. This setup maintained snow showers in the mountains of the Pacific Northwest and Sierra Nevadas and translated into another shot of moderate to heavy snowfall for areas of the Great Basin through the Central and Northern Rockies and into parts of Nebraska and western South Dakota. The heaviest snowfall accumulations were expected in the Colorado and Wyoming Rockies as storm snow totals of 12 to 16 inches remained possible. In addition to heavy snow, strong winds, gusty at times, created periods of blowing and drifting snow, leading to lowered visibilities and ultimately hazardous travel conditions.
As this system shifted eastward on Tuesday, moisture from the Gulf of Mexico streamed northward into the Plains and created chances of isolated to scattered showers and thunderstorms in the Southern and Central Plains. Parts of the Texas South Plains into northwest Texas were at slight risk of severe thunderstorms development through the afternoon and evening, while parts of the Central Plains remained at slight risk through tonight. The main concerns with severe weather activity in these regions were large hail events.
Meanwhile, a cold front associated with low pressure lifting through eastern Canada trekked eastward through the Midwest toward the Northern Appalachians. Ample moisture ahead and along the front fueled scattered showers and thunderstorms along and jest north of the front in the Ohio Valley and scattered showers ahead of the front in the interior Northeast. Areas of the Lower Ohio and Tennessee Valley remained at slight risk of severe thunderstorm development during the afternoon and evening. The main severe weather concerns in these regions were large hail and damaging wind gusts.
Temperatures in the Lower 48 states Tuesday have ranged from a morning low of 8 degrees at Yellowstone, Wyo. to a midday high of 90 degrees at Naples, Fla.
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Sub-freezing temperatures and an approaching upper level disturbance could combine to produce some patchy freezing drizzle or sleet Saturday and early Sunday morning.