Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 311 PM EDT Sat May 31 2025 Valid 00Z Sun Jun 01 2025 - 00Z Tue Jun 03 2025 ...Moderate to heavy rainfall and localized flash flooding continues into this evening for interior New England... ...Showers and thunderstorms expected to reach the Desert Southwest Sunday night and then the Four Corners Monday morning with a risk for flash flooding... ...A round of rain expected for the northern Rockies/High Plains Sunday night into Monday morning with gusty winds... ...Storm chances shift from the southern Plains Sunday to the central/northern Plains Monday... An anomalously deep low pressure system for late May continues to churn northward through New England this afternoon (Saturday) accompanied by widespread showers and thunderstorms. Plentiful moisture leading to locally heavy downpours (rain rates of 1"/hr) and repeated rounds of storms focused through portions of Vermont and New Hampshire may lead to some scattered instances of flash flooding, with a Slight Risk of Excessive Rainfall (level 2/4) in effect. Storms will lift northeastward from central New England into Maine through this evening and should come to an end for all locations by Sunday morning. Forecast high temperatures Sunday more broadly across the Northeast and into the Mid-Atlantic, Lower Great Lakes, and Ohio Valley will remain below average Sunday under an associated upper-low and following a cold front passage, ranging from the 50s and 60s in the Interior Northeast and 60s and 70s elsewhere. Highs will climb closer to average and be in the 70s for most by Monday as the upper-low departs the region. The upper-ridge bringing very hot, Summer-like and record heat to the West Saturday will begin to shift eastward on Sunday, with well above average temperatures into the 80s and 90s stretching from the Interior West into the northern Plains. The heat will shift into the Upper Midwest on Monday while an upper trough/accompanying surface cold front moving south through the interior West brings much cooler temperatures to the northern Rockies/High plains (highs in the 60s) and more seasonable temperatures elsewhere in the Great Basin and along the West Coast (70s and 80s). Showers and thunderstorms, along with some gusty winds, will accompany the cold front passing through the northern Rockies/High Plains Sunday night into Monday. Meanwhile, further south, moisture associated with the remnants of Alvin will flow northward into the Southwest Sunday bringing showers and thunderstorms capable of locally heavy rainfall. Some scattered instances of flash flooding will be possible, especially across southeastern Arizona where a Slight Risk of Excessive Rainfall is in place. The storms will shift northward into the Four Corners region Monday with moderate to locally heavy rainfall and additional isolated instances of flash flooding possible. Below average highs are expected, with 80s to low 90s in the Desert Southwest Sunday and 60s across the Four Corners region by Monday. An upper-level shortwave and accompanying surface cold front moving southward over the central/southern Plains will trigger a round of storms this evening. Some storms may be severe across portions of southern Kansas and central Oklahoma, with a Slight Risk from the Storm Prediction Center (level 2/5) for the threat of large hail and damaging winds. The front will continue southward into central/eastern Texas Sunday, with another Slight Risk of severe weather in effect for the threat of very large hail and some damaging winds. Then, on Monday, anomalously high moisture will return northward ahead of the approaching upper-trough/cold front passing through the northern Rockies and into the central/northern Plains and Upper Midwest. Thunderstorm development is expected to focus along the cold front, with Slight Risks in effect for both severe weather and Excessive Rainfall/flash flooding, generally from eastern South Dakota southwest through central/western Nebraska and into southeastern Wyoming/northeastern Colorado. Forecast highs across the central/southern Plains and into the Mississippi Valley will be around to above average the next couple of days, with 80s and 90s forecast. Elsewhere, daily shower and thunderstorm chances continue for Florida. An upper-level shortwave passing over the Southeast will lead to some scattered storm chances Sunday. Forecast highs Sunday and Monday are generally around average, with mostly 80s expected. Putnam Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php