Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Fri Sep 29 2017 Valid 12Z Fri Sep 29 2017 - 12Z Sun Oct 01 2017 ...Heavy rain possible across the southern Rockies... ...Scattered showers and thunderstorms expected in southern Florida... ...Snow possible for portions of the Northern Rockies this weekend... Numerous to widespread showers and thunderstorms are expected for portions of the Southwest/Southern Rockies into the weekend as ample moisture interacts with a stalled frontal near the Mexican Plateau. Heavier amounts will focus along the higher terrain of central New Mexico today before shifting northward to western Colorado and Wyoming Saturday and Sunday. Higher elevation snow is expected on Saturday in the higher peaks of Wyoming, Utah and Colorado. A marginal risk for excessive rainfall South Texas in addition to New Mexico. Due to the rainfall activity across these areas, temperatures will remain up to 15 degrees cooler than normal. Coverage of lower elevation rain with mountain snow, will increase across the Pacific Northwest and Intermountain West this weekend as a cold front pass through. Heavy snow will be possible Saturday into Sunday for the highest peaks in Idaho, western Montana and Wyoming - a moderate risk for heavy snow in effect for this region on Sunday. Areal coverage of showers and thunderstorms for southern Florida will increase over the next few days as an upper level low over the eastern Gulf of Mexico tracks very slowly over southern Florida. Rain is forecast to expand northward in the central portions of the state -- a marginal risk of flash flooding will be possible over the next few days as some of these thunderstorms could produce heavy downpours that may lead to flash flooding. Cooler temperatures began to infiltrate the East Coast on Thursday as a cold front pushed through. This cooler airmass will continue to sink toward Mexico and the Southeast, keeping much of the East Coast in an Autumn-like pattern. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php