On Tuesday, low pressure roughly over the Middle Mississippi Valley will move eastward to the Lower Great Lakes by Wednesday morning, then move off the New England Coast by Wednesday evening.
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The system will draw moisture northward into the Ohio Valley, and the associated boundary will aid in destabilizing the atmosphere producing showers and thunderstorms from the Ohio Valley to the Southern Plains.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Ohio Valley/Central Appalachians through Wednesday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, moderate to heavy rain will be associated with these thunderstorms that will be going over areas sensitive to excessive rainfall.
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Lower Great Lakes/Ohio Valley into the Central Appalachians through Wednesday morning.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
Furthermore, late Tuesday afternoon, showers and thunderstorms will move into the Mid-Atlantic, with some of the thunderstorms becoming severe.
On Wednesday, showers and thunderstorms will slowly move eastward from Southern New England, the Mid-Atlantic, and the Southeast to off the coast through overnight Wednesday.
Rain will also develop over parts of the Eastern Ohio Valley to the Northeast that will move off the East Coast overnight Wednesday.
Meanwhile, on Tuesday, a front will move from the Northern Rockies/Great Basin to the Southern Plains by Wednesday.
The system will produce rain and highest elevation snow over parts of the Northern Intermountain Region/Great Basin.
Overnight Tuesday, more snow than rain, with a few embedded thunderstorms, will move into the Northern Rockies/Central Rockies and rain over parts of the Central High Plains by Wednesday morning.
As the associated energy moves out of the Rockies into the Plains, moisture will once again be drawn over the Southern/Central Plains late Tuesday into Wednesday.
As a result, showers and thunderstorms will develop over parts of the Southern Plains overnight Tuesday.
On Wednesday, the associated boundary will aid in destabilizing the atmosphere producing showers and thunderstorms over parts of the Southern Plains.
Therefore, the SPC has issued an Enhanced Risk of severe thunderstorms over the Southern Plains from Wednesday through Thursday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, there is an increased risk for EF2 to EF5 tornadoes and large hail, two inches or greater, over parts of the area.
In addition, heavy rain will be associated with these thunderstorms.
Therefore, the WPC has issued a Slight Risk of excessive rainfall with these thunderstorms over parts of Central/Southern Plains and Middle/Lower Mississippi Valley through Thursday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams being the most vulnerable.
Furthermore, the SPC issued a Critical Risk of fire weather over the Southern Rockies and parts of the Southwest on Tuesday.
The fire weather threat is due to gusty winds, dry fuels, and low relative humidity.
On Wednesday, the threat of Critical Risk of fire weather continues over parts of the Southern Rockies. ■