Upper-level energy and ample amounts of moisture will aid in producing showers and thunderstorms with heavy rain over southwestern Texas.
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Therefore, the WPC has issued a Moderate Risk of excessive rainfall over parts of southwestern Texas through Friday morning.
The associated heavy rain will create numerous areas of flash flooding.
Furthermore, many streams may flood, potentially affecting larger rivers.
In addition, due to the cloud cover and rain, the temperatures over southwestern Texas will be 10 to 15 degrees below average through Friday.
The threat of excessive rainfall will reduce on Friday over western Texas.
However, the system will continue to produce showers and thunderstorms with possible heavy rain over the area through Friday evening.
Therefore, the WPC has issued a Slight Risk of excessive rainfall over parts of southwestern Texas through Friday evening.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
Meanwhile, a front over Southeastern Canada will move over parts of the Northeast, moving off the Northeast Coast by Thursday evening.
The front will destabilize the atmosphere over parts of the Northeast, producing showers and thunderstorms that will become strong to severe.
Therefore, the SPC has issued a Moderate Risk of severe thunderstorms over parts of the Northeast through Thursday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
Moreover, upper-level energy over the Central Plains will also aid in producing showers and thunderstorms on Wednesday evening into Thursday.
The energy will help destabilize the atmosphere over parts of the Central Plains, producing showers and thunderstorms that will become strong to severe.
Therefore, the SPC has issued a Moderate Risk of severe thunderstorms over parts of the Central Plains through Thursday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a minimal threat of tornadoes.
Additionally, tropical moisture and a weak front will aid in producing showers and thunderstorms over parts of the Gulf Coast into the Southeast through Friday.
Furthermore, an upper-level ridge over the West Coast extending into the Great Basin/Northern Intermountain Region will remain over the area through Friday.
Excessive Heat Warnings are over most of California into parts of far western Arizona through Friday.
High temperatures will be in the 100 to 110 degrees in some places, with nighttime lows in the 80s.
Heat Advisories are over parts of the interior Pacific Northwest into the Northern Intermountain Region and Great Basin through Friday.
High temperatures will be in the upper-90s and low temperatures in the mid-60s.
In addition, 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 Northwest.
There are two areas of Elevated Risk of fire weather over parts of the Northern Intermountain Region. ■
A clipper system will move quickly across the northern Plains into the Midwest Friday and the Northeast by Saturday, bringing a wintry mix of rain and snow showers ahead of a sweeping cold front.