Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 335 PM EDT Fri May 30 2025 Valid 00Z Sat May 31 2025 - 00Z Mon Jun 02 2025 ...A strengthening low pressure system will bring moderate to heavy rain and gusty winds from the Ohio Valley to the Mid-Atlantic states this evening into tonight, then to New England and the interior Northeast on Saturday... ...Severe thunderstorms likely this evening for parts of the Mid-Atlantic and the Southeast... ...Significant heat expected across interior California and portions of the Southwest through Saturday... A strengthening low pressure system will track across the northern Mid-Atlantic through the evening and overnight hours, reaching New England and the interior Northeast by Saturday. A complex of thunderstorms with moderate to heavy rain along with increasingly gusty winds can be expected along the track of this storm system. The highest chance of heavy rain will be across the Ohio Valley this afternoon an evening and then into the northern Mid-Atlantic by tonight. Some thunderstorms will also have the potential to become strong to severe, possibly resulting in damaging winds, hail, isolated tornadoes, and scattered instances of flash flooding. The severe thunderstorm potential also extends southward into portions of the southern Mid-Atlantic and the Southeast, particularly across the Carolinas and parts of eastern Georgia. The low is forecast to deepen further as the center tracks northeastward through New England on Saturday with a swath of moderate to heavy rain across the interior along with gusty winds expanding across the Northeast. While the initial cold front will be well off the East Coast by Saturday, the instability associated with a cold upper-level trough could trigger additional scattered thunderstorms across the Mid-Atlantic region Saturday afternoon, even though temperatures will be cooler in the wake of the front. Saturday night into Sunday morning, a reinforcing cold front will bring anomalously cool 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. Meanwhile, in contrast to the rain and cooling trend in the eastern U.S., a strong ridge of high pressure will bring heat and persistent dry weather across much of the western U.S. and into the northern Plains. In fact, record high temperatures will be threatened across interior northern California this afternoon, expanding into the Great Basin, Idaho, and as far north as western Montana on Saturday. The anticipated dangerous heat in the Southwest for the next couple of days has led to the issuance of Extreme Heat Warnings for portions of southernmost Nevada, southeast California, and northwestern most Arizona. 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 Saturday 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. Miller/Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php