Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 321 PM EDT Sat May 30 2020 Valid 00Z Sun May 31 2020 - 00Z Tue Jun 02 2020 ...An Enhanced risk of severe thunderstorms, Slight Risk of excessive rainfall over parts of the Pacific Northwest, critical fire weather conditions in the Great Basin... ...The northern Rockies and Plains to bask in hot temperatures into the start of the upcoming week... ...Severe threat in the North Central region, heavy showers and strong storms possible in Texas on Monday... A potent upper-level low slamming into California this afternoon will head north this evening with heavy showers and thunderstorms developing out ahead of it. This storm system is responsible for several weather hazards, most notably the threats for severe weather and excessive rainfall. Central Oregon and central Washington are now under both Severe Thunderstorm and Flash Flood Watches through this evening. Parts of northern California and the northern Rockies could also contend with heavy rain and strong thunderstorms. In addition to precipitation, strong winds are likely across the Great Basin where High Wind Warnings and Wind Advisories are in place. The combination of brisk winds and low humidity levels are a recipe for critical fire weather conditions throughout the weekend in the Great Basin and Colorado River Valley. The storm system quickly races northward tonight and by Sunday scattered showers and thunderstorms should be confined to northern Washington, northern Idaho, and northwest Montana. One more day of record breaking heat in the Snake River Valley this afternoon before cooler temperatures arrive throughout the Northwest on Sunday. Sizzling temperatures set up shop over the northern and central Rockies and High Plains where some daily record high temps are possible. A couple daily record high temps could also be set in the Arizona Desert as Excessive Heat warnings continue into Sunday. The regime of much above normal temperatures heads east on Monday with heat indices approaching the century mark in the northern Plains and Upper Midwest. While the North Central region bakes the Great Lakes, Northeast, and on south into the Carolinas will witness substantially cooler temperatures. Daily temperature departures are forecast to range between 5 to 15 degrees below normal both Sunday and Monday. Seasonally cool conditions versus normal are also be possible in the Rio Grande Valley and along the West Coast. The threat for severe weather and heavy rainfall returns to the North Central U.S. on Monday as an area of low pressure passes overhead. To the south, areas of showers and thunderstorms will dot the central Rockies and Texas where heavy downpours are possible, along with the potential for some severe weather. A swath of heavy showers and strong thunderstorms track through the Great Lakes late Monday. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php