Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 PM EDT Sun Sep 23 2018 Valid 00Z Mon Sep 24 2018 - 00Z Wed Sep 26 2018 ...Heavy to excessive rainfall possible from the lower Mississippi Valley to the eastern Tennessee and Ohio Valleys... ...Elevated to critical fire weather threat continues across the Central Great Basin and the Central Rockies... Multiple rounds of heavy rainfall is forecast to continue through midweek along a nearly stationary frontal boundary stretched from the lower Mississippi Valley to the Mid-Atlantic. Areal averages of 2 to 3 inches are forecast through Wednesday afternoon, with isolated amounts nearing 5 inches possible for Tennessee and Kentucky. The WPC excessive rainfall/flash flood outlooks place much of this region within a slight risk on today with a focused area of central Tennessee with a moderate risk. A marginal to slight risk will continue on Monday and Tuesday for the Ohio Valley and central Appalachians. A strong Canadian high pressure sliding into southern Canada behind the cold front will keep parts of the Great Lakes and Northeast on the cooler side. Much of the Southeast and southern Mid-Atlantic will remain in a warm and humid airmass over the next few days. Light and scattered showers are spreading across the Northern Rockies and adjacent High Plains this afternoon as an upper level system moves through the Northwest. This system will increase the threat for rain and thunderstorms along a cold front from the Upper Midwest to the Central Plains Monday and Tuesday. Warmer and drier conditions are expected to persist across parts of the Great Basin and Intermountain region, which will maintain the elevated to critical fire danger. Numerous red flag warnings remain in effect across portions of Nevada, Utah, Wyoming and long with a few counties in South Dakota, Nebraska, Colorado, northern California and southwest Oregon. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php