Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 331 AM EDT Thu Mar 12 2015 Valid 12Z Thu Mar 12 2015 - 12Z Sat Mar 14 2015 ...Flash flooding possible for portions of the lower and middle Mississippi valley and Ohio valley... ...High temperatures 20 to 40 degrees above average are forecast for portions of the northern and central plains and Midwest... A slow-moving low pressure system at the surface and the upper-levels will continue to bring scattered to widespread showers and thunderstorms to much of the south central and southeastern U.S. today. Moisture streaming into the Gulf Coast and lower Mississippi valley today will result in widespread showers and thunderstorms, some of which may produce heavy rain and the possibility of flash flooding. This area of widespread rain and thunderstorms will shift northward into the Ohio valley and eventually into the Mid-Atlantic states tonight into Friday. An upper-level disturbance crossing the western U.S. will bring scattered rain and snow to much of the Intermountain West today. Scattered rain and snow showers will begin to decrease in coverage early Friday morning as the upper-level disturbance moves away from the region. Another upper-level disturbance and the associated surface frontal system will bring scattered rain and snow showers to portions of the Upper Great Lakes late Friday into Saturday. Temperatures are forecast to be well above average today across much of the western and central U.S. The northern and central plains and the Midwest will see temperatures as much as 20 to 40 degrees above average today. The above average temperatures will continue into Friday where temperatures of 15 to 25 degrees above average are forecast. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php