A front extending from the Great Lakes to the Southern Plains will slowly dissipate on Friday while a new front develops over parts of the Central Plains/Great Basin.
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Upper-level energy over the Southern Plains/Lower Mississippi Valley and very moist air will aid in producing showers and thunderstorms with heavy rain over parts of southeastern Texas and Louisiana.
Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Western/Central Gulf Coast through Saturday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas the most vulnerable.
In addition, some of the showers and thunderstorms will be severe.
Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Southern High Plains through Saturday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Further, there will be an additional risk of hail two inches or greater over the area.
Moreover, the developing front over western Kansas will cause a second area of severe thunderstorms.
Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Central High Plains through Saturday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Furthermore, on Friday, showers and thunderstorms will develop along and ahead of the front extending from the Great Lakes to the Lower Mississippi Valley.
The showers and thunderstorms will march eastward into the Lower Great Lakes, Central Appalachians, Mid-Atlantic, and Southeast.
By Saturday, the new front will extend from the Upper Great Lakes to the Southern High Plains.
Moisture pooling along the boundary will create showers and thunderstorms with heavy rain over central Texas and parts of southeastern Oklahoma.
Therefore, the WPC has issued a Slight Risk (level 2/4) of excessive rainfall over parts of the Southern Plains from Saturday into Sunday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, small streams, and low-lying areas the most vulnerable.
Similarly, some of the showers and thunderstorms will be severe.
Therefore, the SPC has issued a Slight Risk (level 2/5) of severe thunderstorms over parts of the Southern High Plains from Saturday into Sunday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Moreover, there will be an additional risk of hail two inches or greater over the area.
The showers and thunderstorms will also develop along and ahead of the front from the Great Lakes to the Ohio Valley.
A dissipating front will move over the Appalachians into the Southeast on Saturday.
Rain showers will develop over parts of the Northeast into the Mid-Atlantic.
Additionally, showers and thunderstorms will extend from parts of the Tennessee Valley to the Southeast.
Meanwhile, upper-level energy over the Northern Rockies will create light snow over parts of the Northern Rockies and Northern High Plains on Friday, ending by Friday night.
Moreover, a front over the Eastern Pacific will move onshore over the Pacific Northwest overnight Friday, moving inland to the Northern Intermountain Region and Southern California by Sunday morning.
The system will produce rain over parts of the Pacific Northwest Coast overnight Friday, expanding into Northern California by Saturday morning.
Light snow will develop over parts of the higher elevations of the Pacific Northwest on Saturday.
As the front moves inland, rain expands into Southern California on Saturday afternoon.
Heavy snow will develop over parts of the Sierra Nevada Mountains overnight Saturday into Sunday.
By Sunday morning, snow will move over parts of the Great Basin. ■
A very active and complex mid-May weather pattern is set to produce numerous areas of severe weather, heavy rain, high winds, and anomalous temperatures through this weekend.