An upper-level high will begin to weaken overnight Sunday.
Article continues below
However, high temperatures to climb into the upper 90s and 100s over the Southern Plains into the Lower Mississippi Valley and dew points in the upper 60s to mid-70s have prompted Excessive Heat Warnings and Heat Advisories over the region through Monday.
In addition, many locations will have record high low temperatures contributing to areas not cooling off overnight, which will also contribute to the effects of heat.
In addition, there will be other areas with Excessive Heat Warnings and Heat Advisories over parts of Northern California and extreme Southeastern California/Arizona along with parts of the Central Plains, but none of these look like they will be records.
Meanwhile, a lingering stationary front with waves of low pressure and tropical moisture will aid in producing showers and thunderstorms over parts of the Southeast that will create areas of heavy rain.
Therefore, the WPC has issued a Slight Risk of excessive rainfall with these showers and thunderstorms over the Southeast through Monday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
However, the excessive rainfall threat continues over Southeast Coast over a slightly smaller area on Monday.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of South Carolina and Georgia from Monday into Tuesday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
In the meantime, upper-level energy and a weak front will aid in destabilizing the atmosphere over the Northern Plains/Upper Mississippi Valley.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of North Dakota, Minnesota, and Wisconsin through Monday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, there will be a second area of severe thunderstorms over parts of the Northern High Plains.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of Montana, Wyoming, and South Dakota through Monday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
From Sunday evening into Monday morning, the front will become more robust over parts of the Midwest, producing more severe thunderstorms on Monday.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Middle Mississippi Valley and Upper Great Lakes from Monday into Tuesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
Moreover, weak monsoonal moisture will trigger diurnal showers and thunderstorms over parts of the Southwest and Southern Rockies into parts of the Central Rockies on Sunday into Monday morning.
However, on Monday, there is a Slight Risk of excessive rainfall with the monsoonal thunderstorms over parts of south-central Colorado and northeast New Mexico into Tuesday morning.
Furthermore, there is an area of Elevated Risk of fire weather over parts of Idaho and Wyoming on Sunday and a second area over parts of western Kansas. ■
A clipper system will move quickly across the northern Plains into the Midwest Friday and the Northeast by Saturday, bringing a wintry mix of rain and snow showers ahead of a sweeping cold front.