Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 304 PM EDT Wed Oct 30 2019 Valid 00Z Thu Oct 31 2019 - 00Z Sat Nov 02 2019 ...Extremely critical and life threatening fire weather conditions will continue for portions of Southern California through Thursday. Northern California will begin to see less winds Wednesday night... ...Huge temperatures contrast will continue for 1 more day on either side of a strong front moving across the east... ...Accumulating snows likely from portions of the Upper Mississippi Valley into the Great Lakes... ...Trick or Treaters may get wet from the Gulf Coast, through the Appalachians, Mid-Atlantic, eastern Great Lakes and Northeast, while covered in snow across portions of the western Great Lakes... The Extremely critical and life threatening fire weather conditions will begin to abate tonight across Northern California and late Thursday across Southern California as the strong pressure gradient across California, responsible for the recent high winds, begins to weaken. Dry conditions, however, will remain across California over the next week as the overall weather pattern remains very unfavorable for precipitation along the west coast. The anomalously strong upper trof that has triggered the high winds across California is expected to continue to support a very strong cold front pressing eastward across the eastern U.S. Wednesday night into Thursday. This front is separating much below average temperatures across the western and central U.S. from much above average temperatures across the East. High temperatures are forecast to be 20 to 25 degrees below average Thursday across the Southern-Central Plains and much of the Mississippi Valley, while 10-15 degrees above average across the East. Numerous record high minimum temperature expected Thursday morning stretching from Florida, through the Southeast, Appalachians, Upper Ohio Valley, Mid-Atlantic into southern New England, and again Friday morning across central to south Florida and eastern New England. In contrast numerous record low minimum temperatures expected Thursday morning from California, the Great Basin, southern and central Rockies into the Central and Southern Plains, and again Friday morning across the Southern Plains and portions of the Southwest and Mid Mississippi Valley. The strong front separating the record cold and warmth across the nation will continue to be the focus for a broad region of potentially heavy precipitation from the Gulf Coast, across the Tennessee Valley, Upper Ohio Valley, Mid-Atlantic, Great Lakes and Northeast. Isolated flash flooding and severe weather possible from the Tennessee Valley, Southern Appalachians, Mid-Atlantic and Northeast from Wednesday night through Thursday. Accumulating snows possible Wednesday night through Thursday from northern Missouri, eastern Iowa, northern Illinois, southern Wisconsin into the northern portions of the L.P. of Michigan. Happy Halloween. Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php