Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Fri Jun 9 2017 Valid 00Z Sat Jun 10 2017 - 00Z Mon Jun 12 2017 ...Severe thunderstorms possible for portions of the northern plains through tonight... ...Rain and high elevation snow expected for portions of the Northwest and northern Rockies... ...Well above average temperatures spreading east from the plains and Midwest to the Northeast through the weekend... A low pressure system will move across portions of the northern plains and Upper Midwest tonight, bringing scattered showers and thunderstorms, some of which could be strong to severe. The cold front associated with this system will sweep east into the upper Great Lakes on Saturday before becoming stationary. This will keep showers and thunderstorms a possibility across the northern Great Lakes and the Upper Midwest through the weekend. A few strong to severe thunderstorms will remain possible, and the threat for heavy rainfall will also increase by Sunday as the front becomes stationary across the region. Please refer to products issued by the Storm Prediction Center for further details on the severe weather threat. An anomalous upper-level trough/low will dig southward along the West Coast through the weekend as a stationary frontal boundary remains locked in place from the Great Basin to the central Rockies. Onshore flow associated with the deep upper low will keep showers and a few thunderstorms possible for coastal areas of the Northwest. Locally heavy rain is possible. At the higher elevations of the Cascades and the Sierras, snow will be possible as colder air associated with the upper-level low decreases snow-levels. By Sunday rain and high elevation snow will spread into portions of the northern Rockies. As the upper trough digs into the West, an upper-level ridge will expand across much of the central and eastern U.S., supporting well above average temperatures. High temperatures on Saturday are forecast to rise well into the 90s to near 100 degrees from much of the southern and central High Plains to the Upper Midwest, which is 10 to 20 degrees above average. On Sunday the heat will begin to spread east, with much of the Mid-Atlantic and Northeast reaching the low to mid 90s. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php