While the late-July sun continues, it's a mixed bag of weather across the U.S. this weekend, with showers and thunderstorms popping up from coastal Texas to Louisiana and over to the Carolinas.
The cities that are expected to see the most rain and face the highest risk of flash flooding include Raleigh in North Carolina, as well as Houston and Galveston in Texas, according to AccuWeather meteorologists.
AccuWeather Meteorologist Brandon Buckingham has pointed out that the main surge of moisture from the Gulf of Mexico is set to target southeastern Texas and parts of Louisiana throughout the weekend and possibly into next week.
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"From Tuesday to Saturday, this zone from the Texas coast to western Louisiana will receive a general 1-4 inches of rain with pockets of 4-8 inches," Buckingham noted, adding, "There is an AccuWeather Local StormMaxTMof 15 inches for the event."
Already, Brownsville, Texas, has been drenched with nearly 5 inches of rain due to the ongoing pattern since early Friday morning, while Lake Charles, Louisiana, has seen 6.17 inches.
In southeastern North Carolina, expect scattered showers and storms to bubble up later this morning through the afternoon. Some of these storms may linger and unleash heavy downpours, raising the threat of flash flooding.
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Weather Nation has reported that Raleigh, NC, has retracted its flash flood warning, yet an areal flood watch is still in place until Friday. Meanwhile, a Flash Flood Warning is in effect for Galveston, Texas City, and La Marque, TX, until 11:00 AM CDT.
AccuWeather meteorologists are sounding the alarm for a weather pattern reminiscent of the one from late June to mid-July, which brought flooding and damaging winds to parts of the northern Plains and Midwest.
Additionally, a large heat dome, created when a vast area of high pressure sets up at most atmospheric levels during the summer, is predicted to form over the southern Plains and Rockies next week.
This most recent bout of severe weather feels like a continuation of the major flooding and rains that has affected a chunk of the country. Just last week, a severe storm was forecasted to rip across the North-Central US, with warnings of hail, frequent lightning, flash flooding, and even tornadoes.
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This impending heat dome's northern and eastern tiers will experience disturbances in the jet stream, becoming the hotspots for thunderstorms and severe weather events.
These storms could evolve into large thunderstorm complexes, bringing powerful wind gusts, hail, frequent lightning, and flash flooding. In some cases, tornadoes may also occur.
When a particularly fierce weather pattern stretches over 400 miles or more, accompanied by persistently high wind, it may escalate into a derecho. A derecho is a widespread, enduring wind storm associated with a rapidly moving band of showers or thunderstorms.
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According to the National Weather Service: "Although a derecho can produce destruction similar to the strength of tornadoes, the damage typically is directed in one direction along a relatively straight swath. As a result, the term "straight-line wind damage" sometimes is used to describe derecho damage."
"By definition, if the wind damage swath extends more than 240 miles (about 400 kilometers) and includes wind gusts of at least 58 mph (93 km/h) or greater along most of its length, then the event may be classified as a derecho."
Last week, a derecho swept through parts of Iowa, Illinois, and Indiana. There's a possible threat of another derecho next week.
Periods of severe thunderstorms can usher in hurricane-strength wind gusts and heavy rainfall, leading to widespread damage and even significant flight delays. Some of the most volatile and unstable thunderstorm complexes can even spawn tornadoes.
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