Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 345 PM EDT Tue Sep 29 2020 Valid 00Z Wed Sep 30 2020 - 00Z Fri Oct 02 2020 ...There is a slight risk of excessive rainfall over parts of the Northeast and Mid-Atlantic... ...Temperatures will be 5 to 10 degrees below average over the Northern High Plains in contrast temperatures will be 10 to 20 degrees above average over parts of the interior West Coast and the Great Basin... ...Fire weather danger in California to persist through Thursday, dry conditions and record heat along the West Coast... A strong front over the East Coast and tropical moisture will produce heavy rain along the East Coast through roughly Wednesday morning. The WPC has issued a a slight risk of excessive rainfall over parts of the Northeast and Mid-Atlantic through Wednesday morning. The heavy rain will aid in producing scattered, mainly localized, areas of flash flooding with urban areas most vulnerable as well as small streams with isolated significant flash flooding possible through Wednesday morning. The front and moisture will move off the East Coast by Wednesday evening. Meanwhile, another strong front over the Plains will move eastward to Northeast and south to interior Gulf Coast States by Thursday morning. As the boundary passes over the Great Lakes it will produce showers and some of the showers will be rain and snow mixed over the Upper Great Lakes overnight Thursday. Cold high pressure over Western Canada will move southward to the Northern/Central Plains by Thursday evening. In contrast, a strong upper-level high over the West Coast will lead to temperatures being 10 to 20 degrees above average over parts of the interior West Coast and the Great Basin with dry conditions over the region. Additionally, high pressure over the Rockies will aid in producing strong wind over the area with offshore flow over Southern California through Thursday. The SPC has issued an elevated area of fire weather over parts of the Northern High Plains into the Central Plains and over Southern California through Thursday morning. Furthermore, parts of Southern California and the Central Rockies have air quality alerts. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php