Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
242 PM EST Sun Dec 08 2013

Valid 00Z Mon Dec 09 2013 - 00Z Wed Dec 11 2013

...A cold Santa Ana for southern California tonight into Tuesday...
...Cold conditions from the West into the northern Plains through
Tuesday...
...Winter Weather for the Northeast today into Late Monday...

Cold conditions are expected from the Intermountain West into the Northern
Plains as an upper level trough remains steadfast over the region. 
Temperatures across the large section of the West and Northern Plains
should struggle to rise to 20F through Tuesday, before high temperatures
moderate towards 30F Wednesday as the flow becomes more westerly in the
wake of a fairly strong upper level disturbance.

A strong surface high building into the Great Basin combined with a packet
of upper level energy moving by the Sierra Nevada is expected to lead to a
cool Santa Ana wind event for southern California from late tonight into
Tuesday with winds gusting to 40 mph.

On the eastern side of the upper-level trough is where the action is as
upper level disturbances foster waves of low pressure which then ripple up
a frontal boundary, bringing moderate to heavy rainfall to the Southeast. 
From the Mid-Atlantic states northward into New England, a mixed bag of
snow, sleet, and freezing rain is expected through Monday in association
with one of the stronger low pressure centers.


Roth

Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php