Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Fri Sep 21 2018 Valid 00Z Sat Sep 22 2018 - 00Z Mon Sep 24 2018 ...Heavy rain expected for the Southern plains and much cooler weather for the northern tier states... Ongoing widespread, heavy rain across much of Texas and Oklahoma have increased the threat of flooding across the Southern Plains today. Localized areas of 6 to 10 inches will be possible therefore WPC has issued a high risk for excessive rainfall and flash flooding. Although not as elevated, the area of concern will shift east into the Lower and Middle Mississippi Valley this weekend as the frontal boundary slowly moves through the Mid-Atlantic and Gulf states, where additional 1 to 4 inches are forecast. Further north, showers and thunderstorms are tracking across the Great Lakes region and into the Ohio Valley. Some of these storms may be severe given that the Storm Prediction Center has an enhanced risk in effect for portions of Ohio, Pennsylvania, and New York today. Precipitation amounts up to an 1 inch will be possible for the Northeast and northern Mid-Atlantic states this weekend as the front continues eastward. Temperatures are expected to remain below normal across the north-central U.S. It's still summer-like across the Deep South and extending eastward to the southeast coast with highs in the upper 80s and lower 90s with high humidity as the upper level ridge continues to govern the weather pattern. A Pacific low pressure system will move inland tonight over parts of Washington and British Columbia. A plume of heavy showers ahead of it that would affect the greater Seattle area and mainly points north and west. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php