Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Tue Apr 21 2020 Valid 12Z Tue Apr 21 2020 - 12Z Thu Apr 23 2020 ...Strong to severe thunderstorms possible across parts of the Mid-Atlantic and Northeast today along a cold front... ...Developing low pressure system will bring severe weather and flash flooding potential to the Southern Plains to the Lower Mississippi Valley... As a cold front moves across the Northeast and Mid-Atlantic today, thunderstorms are forecast along and ahead of it. A Slight Risk of severe weather is forecast by the Storm Prediction Center for northern parts of the Mid-Atlantic and southern parts of the Northeast before storms move out to sea by this afternoon and evening. Behind the front, light rain and snow is expected for the Great Lakes to the interior Northeast, and a few inches of snow could accumulate in some locations like northern Maine. Windy conditions are also expected, and Wind Advisories are in place for southern New York and southern New England. This cold front will also usher in cold air for the Great Lakes region and Northeast, with high temperatures 15 to 25 degrees below normal. Meanwhile, the Northern Plains should be a warm spot over the next couple of days, along with southern Texas and the Florida peninsula again. An upper-level trough will first lead to rain and snow showers across the Four Corners, and then spread thunderstorms into the Southern Plains today as it moves eastward and a surface low pressure system consolidates. Severe weather is forecast with this thunderstorm activity, so a Slight Risk of severe weather in in place for much of Oklahoma and parts of the Texas Panhandle today. Localized heavy rainfall of 1 to 2 inches causing a few instances of flash flooding is also possible. As the system moves east on Wednesday, thunderstorms are expected to increase across the Lower Mississippi Valley while remaining across eastern parts of the Southern Plains, and severe weather and flash flooding are once again forecast. The highest risk for flash flooding will be across areas that have seen lots of rainfall over the past couple of weeks. Behind this system, Critical fire weather conditions are expected for portions of the Southwest and West Texas. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php