Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
359 PM EST Wed Dec 17 2014
Valid 00Z Thu Dec 18 2014 - 00Z Sat Dec 20 2014
...A slow-moving storm is expected to deliver up to a foot of snow in
northern New England...
...Fine weather prevails in the northern and eastern U.S. while a new
storm will begin to form in the southern Plains...
...Occasional mountain snow and coastal rain showers are expected in the
The short-term forecast period begins with an intensifying coastal storm
over the Gulf of Maine. The storm center is forecast to pass just east of
New England, moving slowly into the Canadian Maritimes over the next
couple of days. Snow is expected to accumulate to the north and west of
the storm track, bringing up to a foot of snow in northern New England.
The snow should taper off early on Friday and should end later in the day
as the storm moves far enough to the east.
A high pressure system is providing fine weather with milder than normal
temperatures across the northern U.S., the Ohio Valley and into the
eastern U.S. Meanwhile moisture is gathering in the central and southern
Plains ahead of an upper-level trough. Some snow and mixed precipitation
can be expected across the central Plains and mid-Mississippi Valley
tonight into early Thursday. However, the entire batch of precipitation
is forecast to collapse during the day on Thursday as the upper-level
trough loses support and de-amplifies. Farther to the south, moisture from
the Gulf of Mexico will begin to gather along a stationary front near the
Texas coast where a new low pressure center is forecast to develop. The
development will begin to accelerate as upper-level energy coming from the
southern Rockies is injected into the system. It appears that showers and
thunderstorms will become heavier and more widespread in southern Texas
Thursday night which will be spreading eastward into the central Gulf
States on Friday.
Over the western U.S., pieces of energy associated with weakening lows and
frontal systems from the Pacific will bring occasional snow showers over
the interior mountains, particularly the southern Rockies and
Intermountain West through Friday. Moderate amounts of rainfall can be
expected in coastal northern California tonight as well as the Pacific
Northwest Thursday night into Friday with the arrival of a new Pacific
No real cold air is in sight for the entire continental U.S. through
Friday. In fact, temperatures are forecast to be more than 10 degrees
above normal in the northern Rockies, northern Plains as well as the
western Gulf Coast.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php