Sunday, February 5, 2023

National Weather Service: Weather forecast for the United States for today December 13, 2022

United States.- The weather forecast center of the National Weather Service, reports on a Gran storm system continues to bring significant weather and widespread hazards Flooding to the blizzard in the center of America,

winter rain It will dissipate northeast from the upper Great Lakes by Tuesday afternoon.

it keeps snowing Temperatures remain cool in the northern and central Rocky Mountains, while temperatures remain cooler throughout the West.

a deep depression and closes in the west, it will move slowly eastward over the Lanos through the period.

A strong embedded vortex maximum over the high plains has been removed as upper level height continues to drop ahead of the tight low, forming a deep surface cyclone in the lee of the Rockies.

This storm system will continue to produce numerous, widespread and impactful weather hazards from the Rocky Mountains to the East Coast.

The Lower Mississippi Valley to the southeast of the warm area of ​​the system will carry both flash flooding and severe weather risks.

Unusually high humidity for December will drift northward from the Gulf and a cold front moving east.

Increased shear and aloft cool air will provide the necessary ingredients for a line of intense convection that will continue to move along the front, with thunderstorms including supercells.

There is a slight risk of extreme rainfall (Level 2/4) concentrated in the lower Mississippi Valley on Tuesday as the initial supercells and convection line produce rainfall totals between 1-2 inches with a few localized areas of Round 2 of rain will do. -4+ inches leads to some scattered cases of flash flooding.

Additionally, the Storm Prediction Center has increased the risk of severe weather (Level 3/5) for southwest Mississippi through northern Louisiana to east-central Texas.

Enough layer combined with strong low- and upper-level shear will be present for any early supercells ahead of the line, as well as embedded within the line to carry the risk of severe hail, winds, and tornadoes, including a couple Capacity is also included. Tornado’s Powerful.

The danger will remain the same as it moves east on Wednesday. There is a slight risk of extreme precipitation from the lower Mississippi Valley northeast to the Tennessee Valley and southern Appalachians.

A tendency for heavy downpours within an area of ​​convection to move parallel to a north-southwest oriented front will extend the duration of rain and toward widespread rainfall of 2+ inches, locally 4+, and the potential for scattered cases Will take Flash flood.

There is also an increased risk of severe weather along the central Gulf Coast as continuing storms have the potential to produce severe hail, winds and tornadoes, including severe thunderstorms.

Meanwhile, cold front air will continue to move south behind the low-lying areas as warm air moves north from the top, bringing widespread winter precipitation and heavy snow across the northern and central Plains and parts of the upper Midwest.

Snow accumulations on Wednesday morning will generally be between 10 and 18 inches, concentrated in the northern High Plains.

The highest snow totals are currently forecast for western South Dakota, eastern Wyoming and northwestern Nebraska where more than 18-24+ inches are possible.

Sustained winds in excess of 40-50 mph will move east of the Rocky Mountains with a rising pressure gradient along the deep surface cyclone, producing widespread blizzard conditions and significant impacts to travel in the high plains.

Accumulations of sleet and snow are also expected in the far east, sleet and snow across parts of eastern Dakota in the upper Midwest.

The current risk of the largest snow accumulations is for northeastern South Dakota, southwestern Minnesota and northwestern Iowa, where snow storm warnings are in effect through Tuesday afternoon.

An accumulation of 3 to 4 tenths of an inch of snow is expected which could cause some power outages.

Additional accumulations of more than one-tenth of an inch are possible for the eastern Dakotas, southern Minnesota and central Wisconsin, with snow and ice accumulation expected in some places, especially in the Dakotas. You can also get up to a quarter inch of nap in the above areas.

Temperatures will be in the teens and 20s for the north and center. High plains and lows in the 50s on Tuesday to the 40s on Wednesday for the central and southern plains. It will begin to dissipate eastward over the upper Great Lakes late Tuesday and Wednesday and the storm system will continue east to the northeast late Wednesday night.

The northward flow of warm air ahead of the system will make it difficult to pinpoint the movement of the rain/snow line over the Great Lakes, and subsequently how long the snow fell and how high the totals could be.

Currently, the best confidence for the highest snow totals is for northern Wisconsin and Michigan’s Upper Peninsula, where surface temperatures should remain cool close to the cyclone’s track and 4-8 inches, locally. Snow has begun in parts of the interior Northeast with a chance of freezing rain for the central Appalachians Wednesday night.

Winter precipitation will continue into Thursday, although an initial snow accumulation of more than one-tenth of an inch will be possible late Wednesday night into Thursday morning.

The temperature just ahead of the system will be between 10 and 20 degrees. above average from the plains to the lower Great Lakes, Ohio and Tennessee basins, and as an upper-level ridge travels southwest between the close to the east and the other to the northeast over the Canadian Maritimes.

Highs will be in the 40s and 50s for the Lower Great Lakes and Ohio Valley to 60s and 70s for the Southeast Tennessee Valley. Highs will remain seasonal for the East Coast as the Northwest flow continues into the region, with lows in the 30s and 40s for the Northeast and the 50s and low 60s for the Carolinas.

Snow will continue in the west under the influence of an upper level trough, with some additional accumulation for the northern and central Rocky Mountains.

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Temperatures will be 10 to 20 degrees below average for this time of year, with highs in the 20s to 30s for the Great Basin and northern and central Rocky Mountains, 40s for the Pacific Northwest and mountains, and 50s to 60s for the southern Rockies. Will be between For California and the Southwest.



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