Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Wed Apr 08 2020 Valid 00Z Thu Apr 09 2020 - 00Z Sat Apr 11 2020 ...Significant snow and gusty winds expected for interior northern New England on Thursday... ...Unsettled weather to continue into Thursday across the Southwest with heavy mountain snow, heavy valley and coastal rain, and the potential for flash flooding over southern California... ...Severe weather possible across the Ohio Valley through tonight before much colder and blustery conditions arrive on Thursday... The anomalously deep upper-level low that has doused California with rain and mountain snowfall the last few days will continue to wobble across the Desert Southwest for a couple more days. Pacific moisture wrapping around the upper low will continue to bring the threat of excessive rainfall into southern California through much of Thursday, with the interior desert being more susceptible to see flash flooding. In the higher elevations, more than of foot of snow remains likely near the highest mountain peaks of southern California, and possibly along the southern stretch of the Sierra Nevada. By Thursday evening, the upper low should begin to show signs of weakening as it drifts farther south to near the Mexican border. Precipitation across southern California should gradually become more widely scattered on Friday as the upper low begins to move toward the east. Farther east, a developing low pressure system ahead of a surge of cold air from Canada will raise the severe weather threat from the Ohio Valley down across the central Mississippi Valley and into the Tennessee Valley through tonight. The severe weather threat will quickly come to an end in these areas on Thursday as a cold air mass rushes in behind a strong cold front. Some thunderstorms can be expected to move across the Mid-Atlantic states Thursday morning before much colder and blustery conditions arrive as a coastal low pressure system is forecast to intensify rapidly near the New England coast Thursday night. In response to this rapid deepening storm, winds will pick up across New England with accumulating snow likely to develop across the northern half of the region where wet snow of over a foot is expected. When the storm intensifies further, gusty winds combining with heavy snowfall could lead to treacherous travel and whiteout conditions. In addition, some lake-effect snow will likely develop on Thursday downwind from the lower Great Lakes on the back side of the intense low pressure system. Meanwhile, a cold Canadian air mass will race across much of the eastern two-thirds of the country behind the storm. Temperatures in portions of the Central Plains could wake up to temperatures near freezing by Friday morning. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php