Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 PM EDT Tue May 15 2018 Valid 00Z Wed May 16 2018 - 00Z Fri May 18 2018 ...A wet and stormy pattern will continue over much of the eastern U.S., with flash flooding and strong to severe thunderstorms possible over southern New England and the northern Mid-Atlantic states... ...An active pattern is expected over the northwestern quarter of the Nation the next few days... ...Shower and thunderstorm activity will be possible for portions of the Great Plains... A wet and stormy pattern will continue over much of the eastern U.S. the next few days as a wavy frontal boundary sags southward into a moist and unstable airmass. The greatest threat for any flash flooding or severe weather will be across southern New England and the northern Mid-Atlantic states Tuesday evening, with the threat for flash flooding across the northern Mid-Atlantic region expected to continue into Wednesday. Also, a weak disturbance lifting out of the eastern Gulf of Mexico could lead to localized areas of heavy rainfall within widespread convection developing across the Southeast and Carolinas Tuesday and Wednesday. WPC's Excessive Rainfall Outlooks and SPC's Convective Outlooks should continue to be monitored. An active pattern is expected over the northwestern quarter of the Nation the next few days as a weakening upper low lifts northeastward of the central Great Basin and an upstream upper low begins to edge inland over California. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php