Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 351 AM EDT Fri May 11 2018 Valid 12Z Fri May 11 2018 - 12Z 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.... Over the next few days the central U.S. will have a frontal boundary in place from the Central High Plains to the Mid-Atlantic. Warm Gulf moisture will transport northward over this boundary and aid in the development of showers and thunderstorms from the Central Rockies, Midwest, Lower Great Lakes/Ohio Valley- some the storms will likely become strong to severe, with embedded heavy rain also possible. The Storm Prediction Center has issued a slight risk for severe weather today across southeast Wyoming/northeast Colorado, shifting on Saturday from northern Illinois to western New Jersey. WPC has marginal risks for excessive rainfall within these common areas, as well. Much of the northern tier states will be cooler through the weekend, while the central and southern states will have temperatures near or above seasonal normal. Heavy rain expected across south Florida will keep the hot temperatures at bay. Some locations is in the South/Southwest may reach, or exceed daily records. Hot, dry and windy conditions will prevail across much of the Southwest/Southern Rockies region which will maintain critical fire weather conditions. Red flag warnings are in effect across most of southeast California, Arizona, New Mexico and southern Colorado. 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. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php