Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
219 PM EST Mon Dec 05 2016
Valid 00Z Tue Dec 06 2016 - 00Z Thu Dec 08 2016
...Severe thunderstorms and heavy rain possible for portions of the
Southeast and lower Mississippi valley...
...Heavy snow possible for portions of the northern plains and Upper
Midwest, as well as the Pacific Northwest...
...Cold air expected to spread across much of the Rockies and the Great
A strengthening low pressure system in the northern Gulf of Mexico will
continue to spread rain and thunderstorms across much of the Southeast and
lower Mississippi valley through tonight. Some areas from the lower
Mississippi valley to the Southeast could see a threat of severe
thunderstorms as well as heavy rain/flash flooding. As the surface low
moves northeastward to the Tennessee valley on Tuesday, precipitation will
spread farther north into the Ohio valley, Mid-Atlantic, and the
Northeast. Cold air in place on the northern periphery of the system will
allow some precipitation to fall as a mix of rain, sleet, and snow from
the northern Mid-Atlantic region into the Northeast. Rain will begin to
come to an end across the Southeast by Tuesday afternoon, but areas of
rain and snow will persist across the Northeast into Wednesday morning as
the low pressure system moves out into the open Atlantic Ocean.
An area of low pressure is forecast to continue deepening across the Upper
Midwest this evening. The system will bring snow to areas from the
northern plains into the Upper Midwest through tonight and into Tuesday.
Heavy snow snow along with gusty winds are possible for some areas,
resulting in the potential for some blowing and drifting snow. Snow will
begin to taper off by Tuesday afternoon as the low pressure system moves
northeast into Ontario, however scattered snow showers will persist into
Onshore flow will continue to spread moisture and precipitation into the
Pacific Northwest through tonight. Cold air in place across the region
will allow precipitation to fall as snow even in valleys, with some
accumulations possible. Across the higher terrain of southeastern Oregon,
including the southern Cascades and Coastal Range, heavy snow is possible.
An Arctic cold front will spread a frigid air mass southward into the
Rockies and much of the plains through midweek. Afternoon highs on Tuesday
are forecast to be 20 to 30 degrees below average from the northern
Rockies into the northern High Plains. On Wednesday these cold
temperatures will spread south into the central Rockies and the central
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php