Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 246 AM EDT Mon Jun 22 2020 Valid 12Z Mon Jun 22 2020 - 12Z Wed Jun 24 2020 ...There is a slight risk of severe thunderstorms and excessive rainfall over parts Red River Valley of the South & ArkLaTex today... ...Record high temperatures possible near northern California, northern New York, and Interior New England Monday & Tuesday... An upper level trough will slowly move from the Northern Plains in the Great Lakes with time. Between this upper trough and the Bermuda High strengthening east of Florida, the best inflow from the Gulf of Mexico, instability and moisture convergence should lie between the Southern Plains, Gulf Coast, and Southeast -- the region where the most concentrated thunderstorm activity and highest rainfall amounts are expected through Wednesday. The highest risk of severe weather and flash flooding (a Slight Risk for each) is today into tonight across portions of the Red River of the South and ArkLaTex near and ahead of a cold front. As the front moves east and south through Wednesday morning, thunderstorm activity is expected to migrate in tandem with the boundary, but the risk of both severe weather and flash flooding are expected to become more marginal with time per guidance from the Storm Prediction and Weather Prediction Centers. Behind the cold front, the coolest temperatures are expected to persist across the North-Central United States. Out West, a building warm core high pressure system will lead to heat building into California and the Great Basin. Record high temperatures will be possible in and near Northern California on Monday and Tuesday. Heat advisories and an excessive heat watch have been posted for between southwest Oregon and the central valleys of California. The building high expanding in from the West will foster hot temperatures across the adjoining Southern Plains, with a risk of record highs near the Trans Pecos region of Texas on Monday. The most anomalous temperature departures from normal over the next few days are forecast for northern New York and interior New England, where highs at or above 90 degrees possible; Monday and Tuesday appear to be when record high temperatures are most threatened in this area. Roth Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php