Because the West Coast of the United States has unusually high thermal values, The center and northeast experience wintry conditions characterized by snowfall, strong gusts, etc extremely low temperatures. The information released by the National Weather Service (NWS) assumes a diverse panorama that will affect millions of people between this Friday, December 12th and Sunday, December 14th.
Starting this Friday, a greatly enhanced atmospheric pattern over North America. As detailed by the NWS, a mid- and high-level ridge will dominate to the west, while a An extensive low pressure area will strengthen over the center and east. This contrast will promote very different temperatures from region to region Record heat in several western states and severe cold over the northern Plains and Midwest.
In the areas that cover the West Coast, Southwest, Great Basin, Rocky Mountains and parts of the Southern Plainsthe thermal markings are localized well above the average at the time.
It is expected that both The daily maximums and morning minimums could break historical records between this Friday and Saturdayparticularly in regions of California and the Southwest.
At the other end of the North American country Arctic air will move from Canada toward the Dakotas, Minnesota, Wisconsin and other sectors of the central north between this Friday and Saturday.
There, those Afternoon highs range from 20°F to 30°F below the usual. This thermal collapse could result in new lows in daily maximum temperatures, particularly on Saturday in the northern Plains and upper Mississippi Valley.
On the way to SundayThe The ice outbreak will reach the Ohio Valley and the Tennessee Valleywhere exceptionally low values could also be recorded.
The interaction between very cold air and a medium disturbance results in a extensive strip of snow that expands in different phases all weekend long. The NWS anticipated this This Friday, snowfall will shift from the northern Plains to the mid-Mississippi Valleywith accumulations increasing as the hours pass. For him SaturdayHe The system will move over the Midwest and later over sectors of the central Appalachians.
The winter weather warnings are in effect in the USA from this Friday.
There are several throughout the United States NWS regional offices maintain updated advisories on winter conditions This will take effect from this Friday morning until Saturday:
The heavy snowfall that accompanies the initial passage of cold air will decrease in the areas downwind of the sea Great lakes this Friday. However, the NWS assumes that they will get stronger again between Saturday evening and Sundaywhen a new influx of arctic air and northwesterly winds increase the thermal contrast over lake water.
This combination will reactivate the snow bandswhich could become permanent and lead to significant accumulations in traditional lake effect sectors.
They were activated based on these conditions Snow warnings due to lake effects in various parts of New York State:
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