Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Sat May 31 2025 Valid 12Z Sat May 31 2025 - 12Z Mon Jun 02 2025 ...Moderate to heavy rain expected to move across the interior New England today with gusty winds... ...Showers and thunderstorms expected to reach the Desert Southwest Sunday night and then the Four Corners Monday morning... ...A round of rain expected to reach Montana Sunday night into Monday morning with gusty winds... ...One more day of significant heat expected across interior California and portions of the Southwest for today... A rather strong low pressure system for late May was tracking into southern New England early this Saturday morning. This system is forecast to move northeastward through the rest of New England for the remainder of today while bringing a round of moderate to heavy rain especially across the interior sections during the day today along with gusty winds expanding across the Northeast. The cold front trailing south from the system center will be pushing well off the East Coast today. Nevertheless, instability associated with a cold upper-level trough behind the front could trigger additional scattered thunderstorms across the Mid-Atlantic region this afternoon, even though temperatures will be cooler in the wake of the front. Saturday night into Sunday morning, a reinforcing cold front will bring cooler than normal temperatures from the Great Lakes through the Northeast and down into the Mid-Atlantic, setting up a fairly pleasant Sunday to round out the weekend. Some rain/showers are expected to linger over northern New England Sunday into Monday due to the proximity of the deep and large low pressure system which will be taking its time to exit eastern Canada. Meanwhile, in contrast to the rain and cooling trend in the eastern U.S., a strong ridge of high pressure will bring heat and dry weather initially across much of the western U.S. and into the northern Plains. In fact, high temperatures reaching daily record levels will be expanding into the Great Basin, Idaho, and as far north as western Montana today. The anticipated heat has prompted another day of Extreme Heat Warnings for portions of southernmost Nevada, southeast California, and northwestern most Arizona. Meanhwile, Heat Advisories remain in effect for most of today across the interior valleys of California, portions of Nevada into eastern Oregon, portions of Idaho and northwestern Montana. Drinking plenty of water, wearing light colored clothing, and staying in air conditioned areas is advised as temperatures soar as high as the mid-110s Fahrenheit in lower desert locations like Death Valley, California. A cold front from the Pacific is forecast to bring rapid cooling into the Pacific Northwest later today into Sunday but with minimal rainfall expected. Farther south and east, surging moisture ahead of the front across parts of the Rockies and Intermountain West will support high elevation showers and thunderstorms Sunday afternoon and evening. Given the enhanced moisture being drawn in, some of these showers and storms could produce briefly heavy downpours. Across the Desert Southwest, showers and thunderstorms will be on the increase beginning Sunday as an upper-level low from the Pacific reaches into northern Mexico. Scattered thunderstorms can also be expected to develop across the central Rockies Sunday night. By Monday morning, showers and thunderstorms assocaited with the upper low will likely spread further northeastward into the Four Corners region. Across the northern Rockies into the northern High Plains, a low pressure system is forecast to develop as the Pacific cold front progresses farther inland. A swath of moderate to locally heavy rainfall is expected to develop over Montana (especially central Montana) Sunday night into Monday morning as a surge of cooler air associated with a Canadian high pressure system arrives to bring gusty northerly winds. Across the Sunshine state, scattered showers and thunderstorms are expected to linger especially for the southern portions of the Florida Peninsula through the next couple of days due to a stalled front. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php