Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 319 AM EDT Tue Jul 15 2014 Valid 12Z Tue Jul 15 2014 - 12Z Thu Jul 17 2014 ...A slow moving cold front will be associated with heavy rainfall along the East Coast from the Southeast across the Mid Atlantic states into New England... ...Cooler temperatures and low humidity will be common across the mid section of the nation into the Tennessee and Ohio Valleys. Showers and cool temperatures will persist across the Great Lakes... ...Showers and thunderstorms will persist across the Rockies and heavy showers will develop across the Southern Plains where heavy rain is possible as well as temperatures far below seasonal levels... The deep upper trough over the Midwest will begin to lift northeastward but a portion of the system will remain over much of the East Coast. As a result...a cold front will move increasingly slowly as it crosses the eastern states. Copious moisture ahead of the cold front will fuel widespread showers and thunderstorms and the slow movement of the front is likely to cause heavy rainfall to persist especially from the Mid Atlantic states into New England. Several inches of rainfall are possible with an increased possibility of localized flash flooding...as well as a chance for some severe weather as well. Behind the front...a significant period of cooler and drier weather is likely across much of the Tennessee and Ohio Valleys...the middle and Upper Mississippi Valleys and parts of the Northern and Central Plains. Over the Midwest...instability showers and very cool weather will begin to end and clearing skies will follow with comfortable temperatures and humidity. Showers and thunderstorms will be especially prevalent across the Rocky Mountains, peaking in afternoon and early evening. An upper air disturbance currently over the Pacific Northwest will drift southeastward along the Front Range of the Rockies. Combined with a frontal system unusually far south for July, heavy rainfall is expected to occur not only along the Front Range but will spread across the Southern Plains, where rainfall will combine with unusually low temperatures for mid July by Wednesday. Temperatures could be 20 to 30 degrees cooler than the typical very hot conditions found this time of year. Kocin Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php