On Thursday, low pressure over the Central/Southern Plains will move eastward to the Ohio Valley/Mid-Atlantic by Saturday.
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The associated boundary aids in destabilizing the atmosphere producing showers and thunderstorms over parts of the South-Central portion of the country.
Therefore, the SPC has issued an Enhanced Risk of severe thunderstorms over parts of the Southern Plains, Middle/Lower Mississippi Valley, and Tennessee Valley through Friday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, heavy rain will be associated with these thunderstorms.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Central/Southern Plains, Middle/Lower Mississippi Valley, and Ohio/Tennessee Valleys through Friday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams being the most vulnerable.
The severe thunderstorm threat moves eastward to the Southeast and Appalachians on Friday.
As a result, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Central/Southern Appalachians, Central Gulf Coast/Southeast, and Mid-Atlantic from Friday through Saturday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
However, the threat of excessive rainfall will continue over a much small area over the Ohio Valley/Mid-Atlantic.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of the Ohio Valley/Mid-Atlantic from Friday through Saturday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams being the most vulnerable.
Also, on Saturday, upper-level riding building over the Central/Southern Plains aiding in producing high temperatures that will be tied, near, or break records over the region.
Meanwhile, on Thursday, upper-level energy and an associated front will begin to move onshore over the Pacific Northwest, producing light rain over the Northwest.
The light rain will start to move into Northern California by late Thursday morning and by late Thursday afternoon, the rain will develop over parts of the Northern Intermountain Region.
Overnight Thursday, the rain will change over to snow at the highest elevations.
Light rain will move into parts of the Northern High Plains and Northern Plains on Friday, then into parts of the Upper Mississippi Valley by Saturday.
Additionally, the snow levels lower slightly over the Northwest overnight Friday.
Furthermore, on Thursday, the SPC issued two areas of an Elevated Risk of fire weather, one over the Southern Rockies and the second over parts of the Great Basin.
The fire weather threat is due to gusty winds, dry fuels, and low relative humidity.
There are no fire weather threat areas over the lower forty-eight states on Friday. ■