Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 238 AM EST Mon Nov 10 2014 Valid 12Z Mon Nov 10 2014 - 12Z Wed Nov 12 2014 ...Heavy snow possible for the Upper Great Lakes... ...Temperatures will be 20 to 30 degrees below average over parts of the Northern Plains... A storm over the Central Plains will move northeastward to the Great Lakes by Tuesday evening. Cold air over Western Canada will move southward east of the Rockies bring cold air as far south as the Southern Plains. Moisture will overrun the east-west boundary associated with the storm over the Upper Midwest producing moderate snow from the Northern Plains to the Upper Mississippi Valley/Upper Great Lakes that will move into the Upper Great Lakes by Monday evening. The snow will become moderate to heavy over the Upper Great Lakes on Tuesday before moving into Ontario by Tuesday evening. In addition, upslope flow over the Northern/Central Rockies/High Plains will produce moderate snow over the region on Monday morning that will taper off to light snow over the area that will linger over parts of the Northern/Central Rockies through Tuesday evening. On Tuesday as the associated cold front moves over the Middle/Lower Mississippi Valley, moisture will pool along the boundary producing rain over parts of the Ohio Valley to the Lower Mississippi Valley that will move into the Lower Great Lakes/Ohio Valley to the Tennessee Valley by Tuesday evening. Showers and thunderstorms will develop over parts of the Lower Mississippi Valley/Western Gulf Coast also on Tuesday evening. Elsewhere, low pressure off the East Florida Coast will move roughly northeastward to off the Carolina Coast by Tuesday. Showers and thunderstorms will develop along the East Coast of Florida through Tuesday. The showers and thunderstorms will creep into Southeast/Southern Mid-Atlantic Coast on Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php