Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 402 PM EDT Thu May 10 2018 Valid 00Z Fri May 11 2018 - 00Z Sun May 13 2018 ...Rain and late season mountain snow expected across the Intermountain West and northern to central Rockies... ...Widespread red flag warnings remain in place from the Desert Southwest to the southern High Plains... ...Heavy rain and thunderstorms will be possible along and north of a frontal boundary stretched from the central Plains to the northern Mid-Atlantic states... ...Above normal warmth will continue across the southern tier while cooler conditions will prevail over much of the northern U.S.... Rain and late season mountain snow is expected with a large scale upper trough amplifying and closing off over the western U.S. late this week. The highest rain and snowfall totals should be along the northern and central Rockies, where moist easterly flow into the terrain will enhance precipitation in the favored upslope regions. Farther south, the combination of gusty winds and low humidity will heighten the risk for fire weather, and red flag warnings remain in place across a large portion of the Desert Southwest, southern Rockies, and southern Plains. Broad warm advection ahead of the amplifying western U.S. trough will bring an abundance of moisture northward into a strong frontal boundary stretched from the central Plains to the northern Mid-Atlantic states, fueling heavy rain and thunderstorms along and north of the boundary Friday and Saturday. Also north of the boundary, cooler conditions will prevail from the northern Plains to the Northeast while above normal warmth will continue across much of the southern tier, with daytime temperatures possibly approaching or exceeding record highs. An exception to the above normal temperatures will be over the southern tip of Florida, where heavy rains and thunderstorms are expected to lift through the region. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php