Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 456 AM EDT Tue May 06 2014 Valid 12Z Tue May 06 2014 - 12Z Thu May 08 2014 ...Late season snowfall accumulations expected across the mountains of the Western U.S.... ...Rain and thunderstorm activity will be on the increase to the north of a frontal boundary stretched from the central Plains to the Mid-Atlantic coast... ...Enhanced wildfire danger from the Southwest to southern Plains... Widespread unsettled weather will continue beneath a large scale upper trough amplifying over the Western U.S.. On Tuesday...shower activity should concentrate to the north and west of a frontal boundary stretched from Wyoming down into southern Nevada...and the activity should sink slightly southeastward with the front on Wednesday. Although there will not be a tremendous amount of moisture to work with out West...orographic effects should lead to some moderate amounts over the upslope side of the terrain. Also...falling temperatures across the region should lead to numerous snow showers and even some late season accumulations in the higher elevations. A frontal boundary will remain stretched through the eastern half of the Nation...extending from the Mid-Atlantic coast to the Great Plains. Rain and thunderstorm activity will be on the increase to the north of the boundary as moisture makes a gradual return from the Gulf and pieces of energy streak through aloft. This should impact locations across the northern Plains...Great Lakes...and northern Mid-Atlantic states...and some of the developing storms will have the potential to become severe. Also...as the amplifying upper trough impacting the West edges eastward...an axis of moderate to heavy precipitation should set up to the north and west of an area of low pressure deepening in the lee of the Colorado Rockies. Persistently dry conditions and gusty winds will heighten the wildfire threat from the Southwest to the southern Plains. Farther east...afternoon convection...especially on Wednesday...will be possible to the east of a dry line across Texas and Oklahoma. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php