Unseasonably warm temps offer one more weekend to finish outdoor
winter storm in western and Rocky Mountain states this weekend,
push cold through Midwest to East Coast next week
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[November 10, 2012]
The National Weather Service
Hydrometeorological Prediction Center in College Park, Md., released
the following short-range forecast Friday afternoon.
A major winter
storm is expected to hit the Intermountain West, Rockies and
temperatures for the central and southern Plains will spread
into the eastern U.S.
A strong cold front will cross the
Plains with thunderstorms and much colder temperatures.
The pieces for a major winter storm were coming together Friday.
The forecast says that across the western U.S., a strengthening
upper-level jet and midlevel shortwave trough diving into the
southwestern U.S. will provide plenty of forcing for widespread rain
and snow showers across the Intermountain West. Strong
south-southwesterly flow ahead of a surface cold front will provide
additional orographic lift in favored upslope regions. In Montana,
easterly upslope flow combined with upper-level jet dynamics will
lead to heavy snow across the state. A surface low will develop in
the lee of the Rockies in Colorado by Saturday morning and move
northeast toward the northern Great Lakes. Areas to the north and
west of the track of the surface low will receive heavy snow. Sleet
and freezing rain will be possible to the northeast of the surface
low across the northern Plains as warmer air filters in aloft.
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As this surface low tracks to the northeast across the northern
Plains, a trailing cold front will push across the central and
southern Plains this weekend. Ahead of the cold front, strong
southerly flow produced above-normal temperatures across the central
and southern Plains on Friday. This will continue Saturday with a
warming trend pushing into the eastern U.S. for the weekend. Along
the cold front, showers and thunderstorms will develop Saturday
afternoon across the central Plains, with heavy rain possible.
Temperatures will drop sharply behind this strong cold front.
forecast by the National Weather Service Hydrometeorological Prediction