Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
351 AM EST Wed Dec 17 2014
Valid 12Z Wed Dec 17 2014 - 12Z Fri Dec 19 2014
...Widely scattered showers expected across the Western U.S....
...Weather will become increasingly active over the south central U.S....
...Conditions will remain unsettled from the Great Lakes to the
Multiple weak pieces of energy rippling through the flow aloft will
trigger widely scattered showers across the Western U.S. Wednesday and
Thursday. Moisture will be extremely limited with these
features...keeping precipitation totals light and confined to the favored
slopes of the terrain; However...a more robust system approaching the
coast will bring some more significant precipitation into the Pacific
Northwest by late Thursday or early Friday.
Upper energy swinging out of the Southwest...combined with return flow
from the western Gulf...will spread precipitation across the south central
U.S. Wednesday into Thursday. Rumbles of thunder will be possible across
Texas while a mix of snow...sleet...and freezing rain is expected within
the northern edge of the precipitation shield stretching across the
Central Plains and Middle Mississippi Valley. Upstream...a second piece
of energy aloft will cross northern Mexico and is expected to ignite an
area of heavy rains and thunderstorms over Texas by early Friday.
A surface low deepening off the New England coast and lifting towards the
Canadian Maritimes will keep conditions unsettled from the Great Lakes to
the Northeast the next few days. Atlantic moisture wrapping around the
strengthening storm will fuel widespread coastal rains and interior snows.
Also...the warm ocean air moving in over cooler air at the surface could
result in periods of freezing rain across portions of interior New England.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php