Upper-level energy, weak fronts, tropical moisture, and upslope flow will aid in producing showers and thunderstorms with heavy rain over parts of northeast Alabama and northwestern Georgia.
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Therefore, the WPC has issued a Moderate Risk of excessive rainfall over parts of Southern Appalachians through Monday morning, Labor Day.
The associated heavy rain will create numerous areas of flash flooding.
Furthermore, many streams may flood, potentially affecting larger rivers.
In addition, the WPC has issued a Slight Risk of excessive rainfall over parts of the Lower Great Lakes/Northeast and another area over southern Texas 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.
Furthermore, monsoonal moisture and upper-level energy will produce diurnal areas of showers and thunderstorms from parts of Southern California and Southwest through late Sunday night, with heavy rain possible.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of Southeastern California and Southwest through Monday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
On Labor Day, the threat of excessive rainfall lessens slightly and moves eastward into the Northeast to the Ohio Valley and Southern Appalachians Monday.
The threat of excessive rainfall decreases to a Slight Risk over parts of the Northeast to Ohio/Tennessee Valleys and Southern Appalachians and a second small area over the southern tip of Texas from Monday, Labor Day, 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.
The showers and thunderstorms continue from parts of Northeast to Ohio Valley and the Lower Mississippi Valley on Tuesday.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Northeast to the Mid-Atlantic on Tuesday into Tuesday evening.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
Meanwhile, an upper-level ridge over parts of California and into the Northern Rockies will remain over the area through Tuesday.
Therefore, excessive Heat Warnings are over most of California into parts of far western Arizona/southern Nevada through Monday.
High temperatures will be in the 100 to mid-110 degrees in some places, with nighttime lows in the upper 80s and low nineties.
Moreover, a few locations will have record high low temperatures contributing to areas not cooling off overnight, which will also contribute to the effects of heat over parts of the region.
Additionally, Heat Advisories are over parts of northern Nevada/western Utah and southeastern Oregon/southern Idaho into Tuesday.
High temperatures will be in the upper-eighties to upper-nineties and low temperatures will be in the low-seventies to mid-sixties.
There is a Critical Risk of fire weather over parts of the Northern California/Great Basin through Monday morning.
Likewise, there is an Elevated Risk of fire weather over parts of Northeastern California, Great Basin, Northern Intermountain Region, Northern Rockies, and Northern Plains through Monday morning.
The fire weather threat has prompted Red Flag Warnings over most of the region. ■