Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 PM EDT Fri Oct 10 2014 Valid 00Z Sat Oct 11 2014 - 00Z Mon Oct 13 2014 ...There is a slight risk of severe thunderstorms over parts of the Southern Plains... ...Flash flooding is possible over parts of the lower Mississippi valley and Tennessee valley... ...Temperatures will be 10 to 20 degrees below average across portions of the southern/central plains, Ohio valley and Great Lakes... A quasi-stationary frontal boundary extends from the Mid-Atlantic states across the Tennessee and Ohio River valleys and into the southern plains this afternoon. The portion of the front over western Texas/New Mexico is moving south as a cold front. This frontal boundary will be the focus for several areas of showers and thunderstorms through the short range forecast period. A wave of low pressure will develop along the front near the Mid-Atlantic coast tonight and move northeastward off the New England coastline on Saturday, bringing widespread showers and thunderstorms to the Mid-Atlantic states and southern portions of New England. Farther west along the front, scattered to widespread showers and thunderstorms will persist from the southern plains into the Tennessee/Ohio valleys through much of the weekend. The Storm Prediction Center is forecasting a slight risk of severe thunderstorms across portions of the southern plains through tonight. Please see the Day 1 Convective Outlook issued by the Storm Prediction Center for more information. Additionally, flash flooding will pose a threat tonight into Saturday for areas along the front from Texas to Tennessee. North of this frontal boundary, afternoon high temperatures will be 10 to 20 degrees below average -- due to a combination of a cooler air mass behind the front as well as some clouds and precipitation. A Pacific frontal system will move onshore tonight and will cross the northern Intermountain states on Saturday. Precipitation will increase across the Pacific Northwest on Saturday as the front passes and across the Intermountain West by Saturday night into Sunday. Snow is forecast to fall Saturday night into early Sunday at some of the higher elevations in western Wyoming. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php