National Weather Summary for Tuesday, December 13, 2016
by David Moran, on Dec 13, 2016 11:17:14 AM
Thunderstorms across southern portions of Louisiana and Mississippi will increase in coverage Tuesday morning. Heavy snow is forecast for portions of the Pacific Northwest and Northern Rockies Wednesday through Friday.
Thunderstorms ongoing this morning across southern portions of Louisiana and Mississippi are forecast to increase in coverage and intensity throughout the morning. Moderate wind shear, but limited instability, may allow a few thunderstorms to become strong, with wind gusts of over 50 mph the primary hazard.
Along the Texas and Louisiana coasts, dense fog is expected to continue through early Wednesday morning. This fog is expected to reduce visibility below two miles and possibly one mile at times.
Major Cities in Region: Baton Rouge, LA, New Orleans, LA, Mobile, AL, Pensacola, FL
A surface low will develop off the coast of Northern California late tonight and into Wednesday. Moisture will increase ahead of the low. At the same time, cold air will move south, leading to heavy snowfall. Snowfall accumulations of 6-12 inches, with isolated higher amounts more than 15 inches, will be possible for portions of central and eastern Oregon. Light freezing rain will also be possible on Wednesday with accumulations generally less than a tenth of an inch. Snow is expected to be the primary hazard. Given that snowfall will be heavy at times, visibilities may be reduced below two miles within heavy snow bands. Wind chills below 15 degrees will be possible. Across Idaho, 4-8 inches of snow, with locally higher amounts in excess of 10 inches, will be possible. Snow accumulations of 5-10 inches, with locally higher amounts in excess of 12 inches, will be possible. In addition to the snow, winds of 10-15 mph with gusts in excess of 20 mph, and wind chills of -15 to -25 F will be possible for western Wyoming and south-central Montana.
Major Cities in Region: Boise, ID, Missoula, MT, Helena, MT, Jackson, WY, Billings, MT
Excessive Rainfall Possible for the Pacific Northwest on Tuesday
With the approach of a Pacific low along the coast of the Pacific Northwest, heavy to excessive rainfall will be possible beginning on Wednesday and continuing through early Thursday morning. Given ample moisture in the region, total rainfall accumulations of 3-5 inches with locally heavier amounts in excess of 6 inches will be possible.
Major Cities in Region: Portland, OR
Excessive Rainfall Risk Outline for Wednesday
A Look Ahead
As the area of low pressure moving into the Pacific Northwest continues to move eastward, heavy snow will continue across portions of the Northern Rockies and into the Northern Plains on Friday. Snow accumulations of 8-12 inches with isolated higher amounts in excess of 16 inches will be possible in the higher elevations. Across the Northern Plains and into the Dakotas, 6-8 inches of snow will be possible. Snow will continue across portions of the Rockies on Sunday for areas of Colorado, Wyoming, and Nebraska. Accumulations of 3-4 inches with locally higher amounts in excess of 12 inches will be possible. As an area of low pressure moves eastward on Saturday, snow is likely across portions of the Ohio Valley into the Northeast; snow accumulations of 4-6 inches will be possible. Across the Appalachians, sleet and freezing rain will be possible.
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