A front extending across the Great Lakes to the Central Plains will move slowly eastward to the Northeast Coast by Tuesday.
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The front will trigger showers and thunderstorms along and ahead of the boundary producing areas of heavy rain.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of Northern New England through Tuesday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
Furthermore, the showers and thunderstorms will be strong to severe.
Therefore, the SPC has issued a Marginal Risk of severe thunderstorms over parts of the Northeast through Tuesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
Meanwhile, low pressure off the California Coast will stream moisture into parts of Northern/Central California, producing rain with the possibility of heavy rain over the region through Wednesday.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of Northern/Central California through Tuesday morning.
On Tuesday, the Marginal Risk of excessive rainfall will extend over Northern California and parts of Oregon through Wednesday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain and burn scars.
In addition, moisture surging northward into the Southwest/Southern Rockies and upper-level energy will aid in producing showers and thunderstorms with the possibility of heavy rain.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of Southwest/Southern Rockies and far western Texas through Tuesday morning.
On Tuesday, the Marginal Risk of excessive rainfall will continue over parts of the Southwest/Southern Rockies and extend into parts of the Great Basin/Central Rockies through Wednesday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain and burn scars.
Moreover, a front over the Northern High Plains into the Pacific Northwest will move eastward to the Great Lakes on Tuesday into Wednesday.
The system will produce showers and thunderstorms over parts of the Northern Plains on Monday, moving into the Great Lakes on Tuesday.
On Tuesday, the showers and thunderstorms will be strong to severe.
Therefore, the SPC has issued a Marginal Risk of severe thunderstorms over parts of Wisconsin and Michigan from Tuesday into Wednesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
Additionally, temperatures will be 10 to 20 degrees above average over parts of the Central Plains/Middle Mississippi Valley.
Temperatures will be in the 90s to near 100 over the region, possibly setting records on Tuesday.
Elsewhere, the SPC has issued an Elevated Risk of fire weather over parts of the Northern Rockies on Monday, prompting Red Flag Warnings over portions of Wyoming through Monday evening. ■
Predominant upper-level ridging stretching from the Southwest to the southern High Plains will allow for another day of record-breaking heat across parts of Nevada and Arizona today.