Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 443 AM EDT Sun Apr 28 2013 Valid 12Z Sun Apr 28 2013 - 12Z Tue Apr 30 2013 ...Showers and thunderstorms moving across much of the East... ...Scattered precipitation from the Pacific Northwest to the upper Great Lakes... ...Colder temperatures for the Northwest... A weak area of low pressure is forecast to lift northward through the Ohio valley into the lower Great Lakes region today where it is forecast to dissipate as it runs into an area of high pressure anchored over southeastern Canada and New England. Showers and thunderstorms over the Ohio and Tennessee valleys this morning will continue to move north ahead of the low, while storms continue to develop along the trailing cold front extending back to the western Gulf coast and south Texas. Ample moisture streaming in from the Gulf of Mexico may help to produce locally heavy rainfall amounts in some of these storms. As the system continues to weaken and its upper level remnants drift east, showers and thunderstorms will shift further to the east as well across the mid Atlantic and the Southeast on Monday. High pressure remaining across the Northeast however should keep much of New England dry through Monday. From the Pacific Northwest to the upper Great Lakes region, a parade of cold fronts with scattered precipitation is expected. Precipitation will fall in the form of snow across some of the higher reaches of the northern Cascades and Rockies. The strongest of the cold fronts is expected to drop into the northwestern U.S. late in the period delivering much colder temperatures to the Pacific Northwest and northern Rockies by late Monday. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php