A front extending from the Great Lakes/Middle Mississippi Valley to the Southern High Plains will move northeastward to the Northwest and the Mid-Atlantic/Ohio Valley by Wednesday.
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Showers and thunderstorms will develop along and ahead of the boundary.
Some of these storms may become severe over parts of the Tennessee/Lower Mississippi Valleys.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Tennessee/Lower Mississippi Valleys through Tuesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, on Monday, a wave of low pressure over the Northern High Plains will slowly deepen and move southeastward to the Middle Mississippi Valley by Wednesday.
A second area of showers and thunderstorms will develop along and ahead of the boundary.
Some of these storms may become severe.
Therefore, the SPC has issued Slight Risk of severe thunderstorms over parts of the Northern/Central High Plains through Tuesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Furthermore, there will be heavy rain associated with these thunderstorms.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall with these thunderstorms over parts of the Northern/Central High Plains and a second area over parts of the Great Lakes and Ohio/Tennessee/Lower Mississippi Valleys through Tuesday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
The threat of severe thunderstorms decreases slightly on Tuesday over Tennessee and Arkansas.
Therefore, the SPC has issued a Marginal Risk of severe thunderstorms over parts of the Tennessee/Lower Mississippi Valleys from Tuesday through Wednesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and minimal risk for tornadoes.
In addition, on Tuesday, the wave of low pressure and associated front will produce showers and thunderstorms from parts of Nebraska to the Texas Panhandle, with some of the thunderstorms becoming severe.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Central/Southern High Plains from Tuesday into Wednesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Moreover, the storms will produce heavy rain over parts of Oklahoma and Arkansas and adjoining areas.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Central/Southern Plains and the Middle/Lower Mississippi Valley from Tuesday into Wednesday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable through Sunday morning.
Meanwhile, upper-level ridging and dry soils will combine to allow temperatures to rise to record levels over parts of Texas, with high temperatures in the low to mid-hundreds on Monday and Tuesday.
Additionally, a third front will move onshore over the Pacific Northwest overnight Tuesday.
The system will produce rain over parts of the Pacific Northwest overnight Tuesday and into Wednesday morning. ■