Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun May 10 2020 Valid 00Z Mon May 11 2020 - 00Z Wed May 13 2020 ...Much colder than average temperatures continue through Tuesday for the central/eastern U.S., while warmth continues in the Great Basin... ...Rain and thunderstorms increasing across the Pacific Northwest/Northern California and the Southern/Central Plains Monday and Tuesday, while southern Florida also stays wet... ...Low pressure system could cause thunderstorms across the Great Lakes to Northeast, then light mix or snow on the backside... For the beginning of the workweek, much of the central and eastern U.S. will continue to be dominated by colder than average temperatures. Record low minimum and maximum temperatures should be set from the Plains all the way to the Eastern Seaboard both Monday and Tuesday. Freeze Warnings are currently located across parts of the Midwest, with Freeze Watches across the Appalachians into parts of the Northeast. Meanwhile in the West, warmer than average temperatures are expected to continue across the Great Basin on Monday. Warm and windy conditions will lead to fire weather danger there and parts of the Southwest, and a Critical Risk has been outlined by the Storm Prediction Center. Temperatures in the West are forecast to cool on Tuesday as an upper-level low approaches. The upper-level low coming into the West will also lead to increasing chances for rainfall in the Pacific Northwest and northern California on Monday into Tuesday, with the likely maximum rainfall along the northern California and southern Oregon coast. Higher elevations in the Cascades and Sierra Nevada and then into the Northern Rockies could see some light snow with this. The Northern High Plains could also see a couple of rounds of light snow on the cold side of a front draped across the Intermountain West over the next couple of days, while isolated showers and thunderstorms are possible across the Four Corners states this evening and the Rockies on Monday. Then as upper-level energy moves eastward, rain chances will ramp up over the Central and Southern Plains Monday and Tuesday. Some areas could see 1-2 inches of rain, with locally higher amounts, which may cause isolated instances of flash flooding. Additionally, portions of the Florida peninsula are expected to dry out after this evening's rain, but showers and thunderstorms will linger over southern Florida through Tuesday with a couple of frontal systems in its vicinity. Farther east, a low pressure system is expected to track across the Great Lakes region tonight and into the Northeast on Monday. Thunderstorms are forecast ahead of this low, some of which could be strong to severe--Marginal Risks of severe weather are in place for the Ohio Valley today and for New England tomorrow. Another round of light mixed precipitation or snow is also possible for the Central Appalachians and across parts of the interior Northeast behind the low. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php