Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Thu Nov 01 2018 Valid 12Z Thu Nov 01 2018 - 12Z Sat Nov 03 2018 ...Ongoing heavy rainfall will continue along a frontal boundary from the Gulf Coast to the Ohio Valley on Thursday, shifting into the Northeast by Friday... ...Slight risk of severe weather across portions of the central Gulf Coast states on Thursday... ...Another round of heavy rainfall expected by Friday for the Pacific Northwest... A frontal boundary extending from the Northeast to the Lower Mississippi Valley will push slowly eastward, reaching the East Coast by this weekend. Ongoing widespread heavy rainfall will continue along and ahead of the boundary, and given its relatively slow movement, excessive rainfall/flash flooding is a threat. On Thursday, the flash flood threat is greatest along the central Gulf Coast states, as well as into portions of the Ohio Valley and lower Great Lakes, shifting eastward into the Northeast on Friday as this portion of the front begins lifting northward as a warm front. Across the central Gulf Coast states, severe weather with the main threats being tornadoes and damaging winds, will also be possible and SPC has this region within a slight risk on Thursday. Temperature wise, southerly flow ahead of the front will promote another warm day for the Eastern U.S. on Thursday where daytime highs in the 70s (80s across southern locations) are about 10 to 20 degrees above normal, especially for the Mid-Atlantic states. The backside of the front features a much colder airmass with temperatures 5 to about 10 degrees below normal from the Southern Plains to the Ohio Valley. Out west, general unsettled weather keeps scattered precipitation in the forecast for much of the Northwest. By Friday, a cold front nearing the Pacific Northwest coast will bring another round of heavy rain to western Washington and Oregon, and parts of the interior Northwest. Higher elevation snow, with mainly minor accumulations, will also be possible in portions of Idaho, Montana, and Wyoming. Farther south, warm and dry conditions combined with gusty winds will continue an elevated fire weather threat on Thursday for portions of Southern California including the Los Angeles and San Diego regions. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php