Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 258 PM EST Thu Feb 15 2018 Valid 00Z Fri Feb 16 2018 - 00Z Sun Feb 18 2018 ...Heavy rainfall could bring flooding to parts of the Ohio Valley and Northeast... ...Warm temperatures expected across the eastern U.S. before a strong cold front sweeps eastward... ...Active weather expected for the Pacific West and northern Rockies... Warm, moist air will lift through the eastern U.S. over the next few days. This will lead to very warm conditions--with high temperatures expected to be over 30 degrees above normal. In addition a strong cold front will sweep across the Mississippi Valley and Ohio Valley this evening and into the early morning hours of Friday. As the warm, moist air is in place--showers and thunderstorms will fire off along the boundary. Heavy rainfall will particularly impact the Ohio Valley and may give way to a slight chance of flash flooding overnight. Showers and thunderstorms will move into parts of the Mid-Atlantic and Northeast by tonight. As the front pushes south, lighter rainfall will increase in the Southeast and the Carolinas. Behind the cold front, high temperatures are expected to become slightly below average. Multiple upper level disturbances will bring active weather to the Pacific Northwest and the northern Rockies. As a Pacific front approaches the Washington coast on Friday morning, precipitation will begin to increase--in the form of showers and higher elevation snow. This precipitation will continue into Friday and the weekend as multiple systems move across these regions. Heavy snow is expected along the Washington Cascades where there are winter weather advisories in effect mostly on Friday. Reinhart Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php