Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Wed May 28 2025 Valid 00Z Thu May 29 2025 - 00Z Sat May 31 2025 ...Wet weather and below average temperatures expected the next few days from the Central to Southern Plains, east through the Lower Mississippi Valley, Ohio Valley, Southern to Central Appalachians, Southeast and Mid-Atlantic... ...Much above average temperatures to build late week into this weekend from California into the Great Basin as an early season heatwave develops... A wet weather pattern will continue over the next few days across a large portion of the Lower 48 from the Central to Southern Plains, east into the Lower Mississippi Valley, Ohio Valley, Southern to Central Appalachians, Southeast and Mid-Atlantic. Rains currently falling from the Lower Lakes into the Mid-Atlantic Wednesday afternoon will shift northeastward into the Northern Mid-Atlantic, New York State and New England Wednesday night into Thursday. At the same time, the next round of heavy rains will continue to expand eastward across the Central and Southern Plains tonight and into the Lower Missouri Valley, Ohio Valley and Lower Mississippi Valley Thursday into Friday, and across the Central to Southern Appalachians and into the Mid-Atlantic by Friday afternoon/evening. Thunderstorms are possible with this broad area of potentially heavy rains with severe weather also possible from the Central to Southern Plains, east into the Lower Mississippi Valley and Southeast over the next two days. Across these region, large hail and high winds have the greatest probability of occurring, with tornadoes a lesser probability. For most of these areas, this is a continuation of a wet pattern that has been in place for much of the month with much above average observed precipitation having occurred, especially from the Central to Southern Plains into the Lower Mississippi Valley. This next round of potentially heavy rains is in response to a broad mid to upper level closed low centered over the Upper Mississippi Valley, with its effects stretching far to the south and east of the circulation center. In addition to the potential for additional heavy rains across these regions, high temperatures will remain below average for the end of the work week and into the weekend for these areas. There are signs, however, of a pattern change by the end of the weekend into next week, with drier conditions from the central to eastern U.S., and increasingly wet conditions across the Rockies into the Northern Plains. While wet and cool conditions stretch across large portions of the central and eastern U.S. over the next few days, the opposite will be true for much of the west. Much above average temperatures expected to build from California into the Great Basin Thursday, Friday and Saturday, before cooler temperatures begin to move in later in the weekend into next week in response to the above mentioned pattern change on tap for the West. A few record or near record high temperatures possible Friday across California into southern Nevada, with a more widespread record high potential on Saturday from California into Nevada, eastern Oregon, central to southern Idaho, western Montana and northern Utah. This early season heatwave will be producing moderate to major heat related impacts across these regions. Heat advisories are currently in effect across much of central to northern California, while Extreme Heat watches are in effect for southern Nevada into southeast California, with these advisories and watches affecting nearly 15 million people. Oravec Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php