Tropical moisture, upper-level energy, and a weak front over parts of the Central Gulf Coast into the Southeast will aid in producing showers and thunderstorms with heavy rain over parts of Louisiana, Mississippi, Alabama, and the western parts of the Florida Panhandle.
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Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Lower Mississippi Valley and Central Gulf Coast through Friday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
The threat of excessive rainfall reduces on Saturday over the Western/Central Gulf Coast/Southeast.
However, the system will continue to produce showers and thunderstorms with possible heavy rain over the area on Saturday and Sunday.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Western/Central Gulf Coast and Southeast from Saturday into Sunday.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
Meanwhile, monsoonal moisture and upper-level energy will aid in producing diurnal showers and thunderstorms over parts of the Southwest, Great Basin, and Central/Southern Rockies.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Southwest, Great Basin, and Central/Southern Rockies through Sunday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
On Saturday, drier air will begin to move into parts of the Great Basin and the Central/Southern Rockies.
Therefore the threat of excessive rainfall will decrease over the region on Sunday.
However, diurnally driven monsoonal moisture showers and thunderstorms will decrease significantly on Sunday evening.
In the meantime, a wave of low pressure and associated front over the Northeast will push off the Northeast Coast by Saturday.
The system will produce showers and thunderstorms over parts of the Northeast into the Central Appalachians through late Friday night.
The low pressure will destabilize the atmosphere over parts of the Northeast, producing showers and thunderstorms that will become severe.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Northeast through Saturday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Moreover, a developing front over the Northwest will move eastward to the Northern/Central Plains by Sunday.
The system will produce light rain over parts of the Pacific Northwest through Saturday.
As the storm begins to pull out of the Rockies into the Plains, a plume of moisture will move into Upper Midwest ahead of the system on Saturday into Sunday.
An upper-level impulse ahead of the front will aid in producing showers and thunderstorms over parts of the Upper Midwest into the Central Plains on Saturday, moving into the Great Lakes and the Ohio Valley on Sunday.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Upper Midwest into Central/Southern High Plains on Saturday, moving into the Upper Great Lakes to Middle Mississippi Valley by Sunday.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
Furthermore, lowering relative humidity, increasing surface winds, and dry thunderstorms will contribute to fire weather concerns over parts of the Great Basin.
Therefore, the SPC has issued an Elevated Risk of fire weather over parts of the Great Basin through Saturday morning.
The threat of fire weather increases on Saturday.
Therefore, the SPC has issued a Critical Risk of fire weather over parts of the Great Basin, expanding into the Northern Intermountain Region and Northern Rockies on Saturday into Sunday morning. ■
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