Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Sat May 07 2016 Valid 00Z Sun May 08 2016 - 00Z Tue May 10 2016 ...Excessive rain for portions of Intermountain West, Central Rockies and western plains... ...Severe thunderstorms possible across the southern/central Plains and the Lower Mississippi Valley... A low pressure system will be present over the southern and central Plains through the weekend; and with a ridge overhead in the mid-to-upper levels of the atmosphere, very little eastward progression will be made by Tuesday. Scattered to widespread showers and thunderstorms, with mountain snows, is forecast across a vast portion of the West and southern/central Plains over the next couple of days. The Storm Prediction Center has issued a slight risk for Sunday for severe thunderstorms to develop from Texas to Nebraska - with Oklahoma and Kansas having a moderate risk. The area of concern will shift slightly to east on Monday, covering eastern Texas and Oklahoma, northern Louisiana, Arkansas, southern Missouri and southeast Kansas. General thunderstorm activity will be possible along a frontal boundary that will extend eastward to the Southeast U.S. coast. Refer to the www.spa.noaa.gov for detailed information on the severe weather threats. The heaviest snow is expected for the highest mountains of Wyoming, Utah, and Colorado. Wyoming has already had significant rainfall with this system with flash flooding - the threat for flooding will remain elevated with any additional rainfall. An excessive rainfall outlook is in effect for portions of Idaho, Utah, southern Wyoming, northern Colorado and western Nebraska through Sunday morning. Another Pacific cold front will move through the Pacific Northwest on Sunday, crossing the northern/central Rockies on Monday. This will keep the Intermountain West region cooler and cloudy with continued precipitation. Snow, or a mix of rain and snow, will be possible for the mountainous areas of northern Idaho and western Montana Monday and Tuesday. A cold front sagging south and east ward through the Northeast and Mid-Atlantic region will keep showers and thunderstorms possible through Sunday. Temperatures across much of the Northeast and northern Mid-Atlantic will finally moderate after nearly a week of unseasonably cool weather and persistent cloudy skies. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php