Deep moisture associated with a slow moving system may produce locally heavy rain and flash flooding in the Lower Mississippi Valley. Three to six inches of rain can be expected, with isolated amounts as high as 10 to 15 inches. Severe storms could produce very large hail and damaging winds in the North Plains. Dry, Gusty winds continue to produce critical fire weather threats in the Great Basin.
Heat Advisories are in place across portions of the Northeast states through Monday due to the combination of hot temperatures and high humidity. Heat Advisories are also in place for the Minneapolis/St. Paul metro area through Thursday. Critical fire weather conditions are forecast through Wednesday across portions of the Great Basin.
Slow moving weather systems may produce isolated severe thunderstorms and heavy rain in the Lower and Middle Mississippi Valleys, and portions of the South Plains into the Central High Plains. Strong high pressure in the West continues to produce record breaking heat and elevated fire weather threats. Dangerously hot conditions are present across interior California and the Desert Southwest.
Strong to severe thunderstorms with damaging winds, large hail, and heavy rain will persist in the South Plains. Additional rain on saturated soils may produce flash flooding, especially, across north-central Texas. A heat wave in the West will reach dangerous levels into the triple digits for some locations. Elevated fire weather threats are in place for portions of interior California.
Scattered severe thunderstorms and heavy rains are possible across parts of the Great Plains where damaging wind gusts, large hail, and a couple of tornadoes are possible. Scattered severe thunderstorms will also be possible across parts of the central and northern Appalachians. Record high temperatures are possible along the East Coast.
Multiple days of heavy rainfall will likely continue to cause considerable flash and urban flooding impacts across portions of eastern Texas, Oklahoma, western Arkansas, and extreme western Louisiana this week. New and renewed widespread minor to isolated major river flooding is expected, and will continue into next week on slow-to-drain rivers.
A meandering front across the Gulf Coast states will continue to bring localized flash, urban, and small stream flooding from the Southern Plains through the Lower Mississippi Valley. Isolated strong to severe storms may produce marginal hail or localized wind damage across parts of northern Florida and southern Georgia.
Isolated strong to severe storms capable of producing large hail and damaging wind gusts may occur across parts of the southern Plains into the Southeast. Heavy rains may cause localized flash, urban, and small stream flooding from the Southern Plains across the Lower Mississippi Valley through Wednesday. Elevated fire weather conditions continue across the Southwest and northern California.
Marginally severe thunderstorms will bring the threat of wind gusts and hail from parts of the central Gulf Coast northeastward into the Mid-Atlantic, and a part of the central High Plains today. This weekend into early next week, heavy rain and strong to severe thunderstorms will be possible over the Central U.S.