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Short Range Public Discussion
(Caution: Version displayed is not the latest version. - Issued 0820Z Dec 06, 2021)
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 320 AM EST Mon Dec 06 2021 Valid 12Z Mon Dec 06 2021 - 12Z Wed Dec 08 2021 ...Gusty winds and lake effect snow to impact the Great Lakes and Interior Northeast through early Tuesday... ...Strong to severe thunderstorms and heavy rain possible today across portions of the Southeast and Lower Mississippi Valley... A vigorous low pressure system currently located over the Upper Great Lakes will exit the U.S. and enter southeast Canada by this afternoon. Light-to-moderate snow on the backside of the system will turn into mostly lake effect showers by this evening as bitterly cold air rushes over the ice-free Great Lakes. Several additional inches of snow are likely for localized areas that typically see impacts from lake effect snow. The arctic airmass over the Northern Plains and Upper Midwest will definitely make extra layers necessary if venturing outdoors. Low temperatures below zero and highs only into the single digits are forecast throughout northern Montana, North Dakota, and northern Minnesota until Wednesday. Gusty winds will make it feel even colder. In fact, Wind Chill Advisories are in effect here to highlight the potential for wind chills to dip as low as 30 below zero. Speaking of wind gusts, portions of the Interior Northeast will also be dealing with potentially damaging winds as a potent cold front pushes through this evening along with scattered showers. High Wind Warnings and Wind Advisories have been issued from far northern Pennsylvania to northern Vermont, where winds could gust over 50 mph. Outside of the aforementioned lake effect snow, Tuesday should be a much quieter day throughout these regions. Farther south, the aforementioned cold front extends to the Southern Plains and is expected to continue racing southeastward until stalling along the Gulf Coast on Tuesday. A line of showers and thunderstorms riding this cold front could spawn a few damaging wind gusts and isolated tornadoes between Alabama and eastern Texas today. The Storm Prediction Center has issued a Slight Risk (level 2/5) of severe weather that includes central Mississippi, northern Louisiana, and far eastern Texas. Additionally, heavy rain and a few isolated instances of flooding cannot be ruled out as well. By Tuesday night, an approaching upper-level trough is forecast to enter the Ohio Valley while an area of low pressure begins to develop along the Carolina coast. As a result, an area of light snow is expected to stretch from the Ohio Valley to the Mid-Atlantic into Wednesday morning. There remains large uncertainty regarding where exactly light snow will fall, but morning commutes may be impacted nonetheless as this would be the first accumulating snowfall for many. For the western U.S., periods of light coastal/lower elevation rain and mountain snow are forecast to overspread much of the Northwest and Northern Rockies today before moisture reaches the Central Rockies and parts of central California tonight. The next cold front is set to sweep into the Northwest on Tuesday night and produce more rounds of mostly light precipitation, with heavier snowfall confined to the far northern Washington Cascades. Snell Graphics are available at