Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Tue Jun 13 2017 Valid 12Z Tue Jun 13 2017 - 12Z Thu Jun 15 2017 ...Strong to severe thunderstorms possible from the Dakotas/Minnesota to the Southern High Plains today, shifting into the Upper Midwest/Midwest on Wednesday... ...Heavy rain and flash flooding possible from the Northern Rockies eastward into the Upper Mississippi Valley today... ...Colder than average temperatures for the West, with snow possible at highest elevations of the Great Basin and Northern Rockies... A low pressure system lifting northeast through the Central/Northern Plains and into Upper Midwest will generate scattered to numerous showers and thunderstorms over the next couple of days. The Storm Prediction Center has highlighted a vast area spanning from the Northern High Plains/Minnesota to the Texas panhandle as having slight to an enhanced risk for severe storms. Additionally, embedded areas of heavy rain will be possible across portions of the northern-tier states that may lead to flash flooding. The area of risk will shift eastward on Wednesday, encompassing much of the Upper to Middle Mississippi valley and surrounding areas. An upper-level low located in the western U.S. is leading to colder than average temperatures and precipitation for the Great Basin, Northern Rockies, and Northern and Central High Plains. Snow is possible for higher elevations of the Great Basin and Northern Rockies through tonight. Elsewhere, thunderstorms are expected over Maine today as a warm front lifts northward. There is a slight risk of severe weather in effect from the Storm Prediction Center. As a cold front moves southward, the Great Lakes and the Northeast are expecting showers and thunderstorms, reaching the Mid-Atlantic on Tuesday. Before this cold front moves through, however, temperatures will be 10-20 degrees above average in these areas. Additionally, throughout the next few days, a combination of warm Gulf moisture advecting northward and upper-level impulses will aid in producing showers and thunderstorms over parts of the Western Gulf Coast eastward into the Southeast. Some storms could produce heavy rain. Campbell/Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php