Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
224 AM EST Thu Jan 23 2020
Valid 12Z Thu Jan 23 2020 - 12Z Sat Jan 25 2020
...Wintry weather expected for the Upper/Middle Mississippi Valley to the
Great Lakes and central Appalachians...
...Locally heavy rain with flooding possible over the Pacific Northwest...
A complex frontal system developing over the MS Valley is expected to
produce areas of light to moderate snow from the mid MS Valley to the
upper Great Lakes through tonight. Rain is expected for much of the Lower
Mississippi Valley. A few embedded thunder showers
are possible there, too. As cold air dams against the southern
Appalachians, light freezing drizzle or freezing rain is possible in
western NC and SC.
As a surface low pressure system consolidates Friday and moves northeast
into the mid MS Valley, snow will spread north of the low into western MI
and WI. Further east,warming aloft changes snow to mixed sleet and
freezing rain in the Central Appalachians. A period of rain is forecast
for the Tennessee Valley, Southeast, and the Mid-Atlantic.
On Saturday, the new low developing in the mid Atlantic spreads the rain
north into New York and southern New England.
Further inland in New York and New England, warming aloft changes snow
into sleet and freezing rain. Interior New Hampshire and Maine may see
freezing rain amounts of a quarter to half of an inch.
Periods of precipitation will continue for the Northwest through the end
of the workweek as ample moisture flows into the region and a front passes
through slowly. Upslope flow is expected to enhance precipitation totals
of the Cascades, Olympics, and Coastal Ranges. The lower elevations should
remain all rain, and flooding is possible in western Washington and
northwestern Oregon through Thursday night and early Friday. Snow is
confined to the higher peaks of the Cascades and into the Northern
Rockies. Locally heavy snow is expected in the highest elevations of the
northern WA Cascades.
Temperatures over the contiguous U.S. will generally be near to above
average over the next couple of days. Cooler spots are forecast to be near
where the cyclone is producing clouds and precipitation over the
Lower/Middle Mississippi Valley today, the Southeast to Mid Atlantic
Friday, and northern mid Atlantic into New England Saturday.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php