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Short Range Public Discussion
 
(Caution: Version displayed is not the latest version. - Issued 0800Z Dec 04, 2022)
 
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 300 AM EST Sun Dec 04 2022 Valid 12Z Sun Dec 04 2022 - 12Z Tue Dec 06 2022 ...Heavy snow in the Sierras; snow spreading from northern and central Rockies into the northern High Plains; isolated flash flooding possible in parts of California and Southwest... ...Heavy rain threat increasing over Tennessee Valleys/interior Deep South from Monday through Tuesday morning... ...Cold air being ushered into the eastern U.S. behind a front... A fresh dose of cold air from Canada is being ushered into the eastern U.S. early this morning behind a cold front. A large high pressure system centered over the mid-section of the country will build eastward to provide fine and dry weather from the Midwest to the East Coast through Monday. Meanwhile, a low pressure system off the West Coast continues to pump Pacific moisture onshore into California this morning. This system will be rather slow-moving as it dumps heavy snow into the Sierra Nevada while periods of moderate rain, heavy at times, will impact the lower elevations especially the northern coast of California for the next couple of days. The moisture will then be carried farther inland and precipitated as snow across the Intermountain West and into the northern and central Rockies through Monday. By Monday night into early Tuesday, a cold front dipping southward from western Canada will interact with the Pacific moisture to bring a period of snow over the northern High Plains as a low pressure wave forms along the front. Farther south, another plume of moisture associated with the subtropical jet stream is spreading an axis of enhanced rainfall this morning from southern Arizona across New Mexico and into the southern High Plains where temperatures are cold enough to support frozen precipitation. This jet stream will be instrumental in setting up a potential heavy rain event across the interior Deep South into the Tennessee Valley during Monday and especially Monday night into early Tuesday as the Gulf moisture is lifted ahead of a warm front. Rain is forecast to expand northeastward toward the Ohio Valley and eventually reach the Northeast with mixed precipitation possible Monday night and early Tuesday ahead of a cold front advancing into the Midwest and across the Great Lakes. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php