National Weather Summary for Friday, December 22, 2017
by David Moran, on Dec 22, 2017 10:45:19 AM
Thunderstorms will continue from east Texas into the Lower Mississippi Valley ahead of a cold front on Friday. Snow will continue for portions of Montana through early Friday evening. Snow is expected for portions of the Central Rockies behind a cold front. Freezing rain and snow will continue across the Great Lakes and Northeast as an area of low pressure moves across the region. Across portions of Oklahoma, light snow and freezing rain may develop through the day and into the overnight hours. Excessive rainfall will continue from northeast Texas to West Virginia ahead of a cold front.
- Thunderstorms from East Texas into the Lower Mississippi Valley Friday
- Snow Friday across Montana
- Snow for the Central Rockies through Saturday
- Freezing Rain and Snow through Saturday across the Northeast
- Snow and Freezing Rain for Portions of Oklahoma through Early Saturday
- Excessive Rainfall Friday from Northeast Texas to West Virginia
Thunderstorms from East Texas into the Lower Mississippi Valley Friday
There will be a threat for strong to severe thunderstorms throughout the day across East Texas into the Lower Mississippi Valley on Friday. A large area of thunderstorms is ongoing across the region ahead of a slow moving cold front. This activity will slowly shift south and east throughout the day and evening. Strong to damaging winds and an isolated tornado will be the primary hazards.
Major Cities in Region: Waco, TX, Shreveport, LA, Little Rock, AR, Tupelo, MS
Snow Friday across Montana
Moderate to heavy snow will continue through the day across Montana, leading to slick to hazardous conditions. Snow accumulations of 3-6 inches are expected in the lower elevations and 8-12 inches in the higher elevations,
Major Cities in Region: Butte, MT, Helena, MT, Great Falls, MT, Billings, MT
Snow for the Central Rockies through Saturday
A cold front is expected to move through the region, bringing the potential for snow late Friday into Saturday behind the front. Snow accumulations will range 2-5 inches in the lower elevations with locally higher amounts. In the higher elevations, 4-8 inches are expected.
Major Cities in Region: Cheyenne, WY, Scottsbluff, NE
Freezing Rain and Snow through Saturday across the Great Lakes and Northeast
Snow and freezing rain will continue across the Northeast through Saturday as an area of low pressure continues to move northeastward. Across western and central New York and northern Pennsylvania, snow accumulations of 1-3 inches with locally higher amounts in excess of 4 inches are forecast. In addition, ice accumulations up to a tenth of an inch will be possible. Across eastern New York, southwestern New Hampshire, and northwestern Massachusetts, 4-8 inches of snow with locally higher amounts and ice accumulations between a trace and a quarter inch are expected. Across southeastern New York into portions of Connecticut and Massachusetts, up to an inch of snow and a tenth of an inch of ice is forecast. Snow accumulations of 3-6 inches are expected across portions of New Hampshire, Vermont, and Maine.
Major Cities in Region: Buffalo, NY, Syracuse, NY, Albany, NY, Burlington, VT, Boston, MA
Snow and Freezing Rain for Portions of Oklahoma through Early Saturday
With temperatures near freezing, as well as temperatures aloft hovering near freezing, there is a chance for a wintry mix during the day. By the late morning, due to warming, freezing rain will transition to rain. Into the evening, temperatures are forecast to fall below freezing both aloft and near the surface. This will allow rain to transition to snow. Snow accumulations up to an inch are forecast across the Oklahoma City metro into the very early morning hours on Saturday.
Major Cities in Region: Lawton, OK, Oklahoma City, OK
Excessive Rainfall Friday from Northeast Texas to West Virginia
Storms along a cold front could produce very heavy rainfall, especially from northeast Texas across adjacent parts of Arkansas and Louisiana into Tennessee, Kentucky, and West Virginia on Friday. Rainfall amounts of 2-4 inches with locally heavier amounts in excess of 5 inches will not be uncommon in locations that receive multiple rounds of heavy rainfall. This will result in a flash flooding threat. The heaviest rainfall is expected overnight into Saturday morning.
Major Cities in Region: Shreveport, LA, Little Rock, AR, Memphis, TN, Nashville, TN, Knoxville, TN
Excessive Rainfall Risk Outline for Friday
A Look Ahead
Model guidance is indicating a surface low moving off the New England coast by early Monday morning. Snow is likely to develop to the north and northwest of this low, and some could be heavy. The low is forecast to continue moving rapidly off to the northeast, however, which should limit accumulations. Currently, the forecast keeps the heaviest snow offshore, however, should the storm's path be closer to shore, snowfall amounts will be higher.
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