Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Wed Sep 25 2019 Valid 00Z Thu Sep 26 2019 - 00Z Sat Sep 28 2019 ...Heavy rain and flash flooding possible across portions of the Southwest, southern Plains and lower to mid Mississippi valley through Wednesday into Thursday... ...Well above-normal to record-breaking temperatures to continue across portions of the South and East through the end of the week... ...Low pressure to produce strong, gusty winds over portions of the northern Rockies and High Plains on Thursday... ...Strong to severe storms, with heavy rain possible, over portions of the mid to upper Mississippi valley and upper Great Lakes on Friday... An upper level low interacting with lingering moisture will continue to produce periods of heavy rain, with isolated severe winds and hail across the Southwest. Flash flooding remains a concern across portions of interior Southern California, Arizona and far southern Nevada through Thursday. As the upper low weakens and moves east, drier conditions can be expected by Friday. Heavy rain, with isolated severe winds and hail, are also possible as showers and storms continue to develop ahead of a cold front dropping into southern Kansas, northern Oklahoma and the Ozark region this afternoon and evening. Ahead of the front, summer-like temperatures will continue, with well above-normal temperatures expected from the southern Plains to the Southeast and along the East Coast on Thursday. Record-breaking heat is expected across parts of the Southeast as temperatures climb well into the 90s across some portions of region Thursday and Friday. While the Southeast will remain warm, some cooling is forecast for parts of the Northeast and Mid-Atlantic as the front moves offshore on Friday. However, warm air surging north ahead of the next system will move from the Midwest on Friday into the eastern U.S. by the weekend. This next system is forecast to develop on Thursday, with a strong area of low pressure moving east along the U.S./Canada border from Montana to North Dakota - producing strong, gusty winds from western into central Montana. This low will continue to move east toward the upper Great Lakes on Friday. A strong trailing cold front will become the focus for strong to severe storms, with heavy rain, as it moves across the upper and mid Mississippi valley into the Great Lakes region on Friday. Lastly, an upper low dropping into the Pacific Northwest late Friday is forecast to foster the beginning of what is expected to become a significant early-season winter storm across portions of the northern Rockies. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php