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National Snow Analyses
Weather SummaryOn Sunday, a surface low pressure center developed in the northwestern Gulf of Mexico beneath a moderately-strong midlevel wave and moved to the northeastern Gulf by Monday morning. Moisture flow from the gulf into the Arklatex over a cold surface air mass caused up to 6 inches of snow to fall there, with lighter amounts extending into northern Alabama, where up to a foot of snow fell.. Moist flow also occurred over a stationary front along the coast. A weak surface low associated with a disturbance rotating about a northern West upper low caused a widespread 1/2 to 1 foot of snow in the central coterminous U.S. The heavier amounts fell in higher-elevation Colorado. This system was able to tap some of the gulf moisture and generate upslope flow into Colorado. A deep surface low continued to move northeastward away from the Northeast; light snow fell there yesterday. Except for the new snow in the South (where some of it was mixed with rain) and the snowpack on the West Coast mountains (which still contain a lot of energy due to their depth), the coterminous U.S. snowpack is cool and stable. There was some slow snowmelt in the Southwest due to above-freezing temperatures and in the windward Cascades to warm and rainy conditions. In the higher-elevation Sierra Nevada, moderate to rapid surface sublimation occurred again on Sunday. The low in the northeastern Gulf of Mexico will cross Florida and be off the Carolina coast by Tuesday morning. Another 1/2 to 1 foot of snowfall is likely across around the southern Appalachians, with the higher amounts expected at elevation. Freezing rain is likely just to the southeast of the mountain range, roughly from eastern Georgia through south-central North Carolina. On Tuesday, the low will strengthen and deepen as it moves from the Carolina coast to south of Cape Cod. One-half to 1 foot of snowfall is likely from the Delmarva to southeastern New York, Connecticut, and Rhode Island. From there, the low will accelerate northeastward on Wednesday and bring up to a foot of snowfall to the coastal Northeast. One-half to 1 foot of snowfall is expected in the higher-elevation northern Appalachians on Tuesday through Wednesday. The central U.S. system will shift eastward to the middle Mississippi River basin by Tuesday morning While the system still has a tap of gulf moisture, it will cause up to 1/2 foot of snowfall today from southern Minnesota to northeastern Kansas to central Missouri. As the system moves to the upper Ohio River basin, it will up to 1/2 foot of snowfall to occur between the Great Lakes and the Ohio River and in the higher-elevation northern Appalachians. After that, this system will merge with the East Coast system. Behind this system will be a moderately-strong Arctic air mass which will spread across the coterminous U.S. which lies east of the Rockies. A surface low will near the Northwest coast by Tuesday night and be onshore by Wednesday morning. The surface pressure gradient ahead of this system will tighten, and a small area of onshore flow will commence into the central West Coast. Around 1/2 foot of snowfall is likely in the northern Cascades on Tuesday with the approach of this system, and up to a foot of snowfall is possible in the interior Northwest as a piece of midlevel energy moves inland. Onshore flow into the northern West Coast will continue through at least midweek and bring heavy precipitation to this area. Snow Reports
Note: these data are unofficial and provisional.
Station Snowfall Reports Interpolated Snowfall Products Model Assimilation
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