Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 AM EDT Fri Jun 21 2019 Valid 12Z Fri Jun 21 2019 - 12Z Sun Jun 23 2019 ...Severe weather and flash flooding both possible for the central and eastern U.S. through the end of the week... ...Snow possible for higher elevations of the West with much below average temperatures... ...Favorable fire weather conditions expected for the Southwest and north-central California... An upper-level trough centered over the northwestern U.S. will gradually deepen and move eastward through Sunday. At the surface, a low pressure system is forecast to track slowly northeastward from the Northern High Plains into south central Canada, while the associated fronts move slowly as well. These features will lead to widespread scattered thunderstorms in the central and eastern U.S. On Friday, Slight Risks of severe weather and flash flooding stretch from the Northern/Central Plains into the Upper/Middle Mississippi Valley and into portions of the Ohio and Tennessee Valleys. An Enhanced Risk of severe weather is in place from the Storm Prediction Center for parts of the Southern/Central Plains on Saturday, and a Slight Risk of flash flooding is outlooked here too. Thunderstorms are also possible for the Ohio Valley and Tennessee Valley, with flash flooding along with a few strong storms forecast. The aforementioned upper-level trough is pretty anomalous for this time of year, and will cause cold conditions in the Intermountain West, Northern/Central Rockies, and Northern High Plains, where high temperatures are expected to be 15 to 30 degrees below average on Friday and Saturday. Some locations have Freeze Warnings in effect. This cold will support accumulating snow in higher elevations of the Northern/Central Rockies, Tetons/Wind River Mountains, and the Wasatch. Several inches of snow is possible in some areas. Winds are forecast to strengthen in the Southwest and in north-central California on Friday and Saturday, and combine with dry fuels and low relative humidity to create dangerous fire weather conditions. The Storm Prediction Center has outlooked Critical Risks of fire weather in these areas. On Saturday, dry thunderstorms are possible in the Southwest, where lightning can ignite a fire with no rain to help extinguish it. Warmer than average temperatures are expected farther east in the Southern Plains, Middle/Lower Mississippi Valley, and the Southeast. Record temperatures, mainly for high minimum temperatures, are possible. Elsewhere, as another low pressure system tracks off the Northeast coast, rain showers on Friday morning should lessen throughout the day in the northern Mid-Atlantic and Northeast. Cooler temperatures are expected for these areas for the end of the week, with high temperatures 5 to 10 degrees below average. Tate Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php