Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
458 PM EDT Tue Mar 24 2015
Valid 00Z Wed Mar 25 2015 - 00Z Fri Mar 27 2015
...Wintry precipitation across the northern Plains into the Great Lakes...
...Severe weather expected in the southern Plains and Mississippi Valley...
...Risk of flash flooding for the Ohio Valley...
Another round of wintry precipitation will make its way from the northern
Rockies eastward into the Great Lakes over the short term period. As an
upper level trough digs across the Plains, snow and mixed precipitation
will move across the northern Plains and into the Upper Midwest by Tuesday
night and into Wednesday morning. By late Tuesday night, freezing rain
will approach the Upper Midwest and spread across North Dakota and
Minnesota by Wednesday morning. Meanwhile, snow will fall north of the
mixed precipitation and will spread across the Great Lakes region through
Wednesday evening. The front associated with the upper level trough will
move away from the Great Lakes and into New England. Snow will taper off
the Great Lakes and will spread across New England as a result.
To the south of the Upper Midwest/Great Lakes system, another front has
set up along the Tennessee Valley eastward into the southern Plains. This
front will get a push from an upper level disturbance and will begin to
move quickly eastward. Ahead of the front, warm and very moist air will
be in place thanks to the influence of the Gulf. These factors, along
with enough instability in place, there could be a threat for severe
weather on Wednesday and into Thursday morning /see the Storm Prediction
Center for more information/. By Thursday, the cold front will stretch
from Canada southward across Texas and into Mexico. This front will
ignite a line of showers and thunderstorms. The risk of flash flooding
will occur on Thursday through the middle Mississippi Valley through the
Ohio Valley. Behind this cold front, there will be a noticeable difference
in air masses as cooler and dry air spreads across the southern Plains and
into the Southeast, Mississippi and Tennessee Valleys.
The Pacific Northwest will have continuous rounds of showers and higher
elevation snow throughout most of the short term period. The peak
intensity of precipitation will occur on Wednesday as a warm front
approaches the coast. However, once the upper level ridge slides across
the West Coast by Thursday, this cuts off moisture across the region and
most of the precipitation will stay northward across British Columbia.
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php