Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 351 PM EDT Tue Oct 10 2017 Valid 00Z Wed Oct 11 2017 - 00Z Fri Oct 13 2017 ...Heavy rain possible across the Ohio Valley and Mid-Atlantic tonight and Wednesday... ...Well above average temperatures expected to continue across parts of the Eastern U.S. with numerous record warm minimas forecast... ...Well below normal temperatures across the Central states should begin to moderate by Wednesday... A frontal boundary will push eastward across the Ohio Valley and the Deep South tonight, eventually stalling along the Southeast coast by Thursday. Expect showers and thunderstorms to accompany this system across much of the eastern third of the nation with the best threat for heavy rainfall near the low across the Upper Midwest and Ohio Valley tonight, into the northern Mid-Atlantic region by Wednesday. Ahead of this front, a hot and humid air mass will remain in place across the Eastern states with afternoon high temperatures as much as 10 to 15 degrees above normal, and dew point values more reminiscent of summer rather than mid-October. In fact, several locations across the Mid-Atlantic, the Southeast, and the central/southern Appalachians are forecasting record values for warm overnight low temperatures tonight and on Wednesday. By Thursday, temperatures may moderate a bit but are expected to remain above average as persistent upper level ridging remains in place. On the other hand, much of the central U.S. has seen well below normal temperatures the past couple of days where widespread freeze and hard freeze warnings were in effect. These temperatures should begin to increase to near normal values by Wednesday and eventually above normal as southerly flow pulls in a more mild air mass ahead of an advancing system from the West. Elsewhere across the country, strong troughing moving into the Western U.S. will bring rain showers to the Pacific Northwest states and wintry precipitation to the higher elevations of the Northwest and northern Rockies. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php