Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 256 PM EST Thu Dec 07 2017 Valid 00Z Fri Dec 08 2017 - 00Z Sun Dec 10 2017 ...Light accumulating snowfall possible across parts of Southern Texas, the interior Southeast, as well as the Mid-Atlantic with heavy rainfall possible elsewhere across the Deep South... ...Locally heavy lake effect snowfall to continue tonight downwind of the Great Lakes... ...Critical to extreme fire weather conditions expected to persist across portions of southern California and southern Arizona... With the presence of a deep upper level trough, daytime temperatures will remain chilly for locations east of the Rockies and especially across the South. From the Southern High Plains to the Deep South, afternoon high temperatures could be as much as 10 to 20 degrees below normal. The cold temperatures combined with energy moving through aloft will continue to allow for accumulating snows across portions of southwest Texas, where winter storm warnings and winter weather advisories are in effect for up to 6 inches of snow. Farther east, moderate to heavy rainfall across the Southern Plains and into the Deep South will continue tonight and into tomorrow as a surface boundary stalls across the northern Gulf of Mexico and central Florida. The possibility remains for a changeover to snow overnight tonight and early tomorrow morning on the back edge of this precipitation shield from south Texas to parts of the interior Gulf Coast. Winter weather advisories are in effect across Southern Texas, as well as from southeast Louisiana to central Alabama for the possibility of minor accumulations. By Saturday, a surface low developing along the front and moving into the western Atlantic could bring mainly light accumulating snows to interior portions of the Mid-Atlantic as well. To the north, cold air moving over the still relatively warm lakes will allow for moderate to locally heavy snowfall to continue tonight immediately downwind of the Great Lakes where winter storm warnings, advisories, and lake effect snow warnings are in effect. A surface low dropping into the region on Friday may also bring additional light snows to parts of the Great Lakes, Upper Midwest, and the Ohio Valley. Finally, amplified upper-level ridging across the Western U.S. will continue the warm and dry pattern through at least the weekend. Gusty winds will keep dangerous fire weather conditions elevated across parts of southern California and into southern Arizona. Wildfires across this region are ongoing and a critical to extreme risk is expected to continue today and into tomorrow, with red flag and high wind warnings in effect. Please monitor products issued by the local weather forecast offices across those areas for additional information. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php