Downpours to drench Houston, San Antonio early this week

By Kristina Pydynowski, Senior Meteorologist

July 25,2016; 7:44PM,EDT

 

 

Downpours will spread from the lower Mississippi Valley to eastern and central Texas early this week, delivering needed rain but raising the concern for flash flooding.
A westward-tracking storm system will combine with moisture from the Gulf of Mexico to deliver downpours in the south-central United States.
The downpours will focus on eastern Texas into Monday night before spreading to central Texas by Tuesday and Wednesday.
"Places like Lake Charles, Louisiana, and Houston and Waco, Texas, will all be under the threat of these heavy thunderstorms," AccuWeather Meteorologist Brett Rossio said.

Other cities at risk include Shreveport, Louisiana, Austin, San Antonio and Corpus Christi, Texas.
The slow-movement of the drenching showers and thunderstorms could trigger localized flash flooding.
"The reason these storms will be slow-moving is because of the very weak winds that will be present several thousand feet above the ground," Rossio said.
"This will prevent thunderstorms from moving very quickly and they will instead remain over the same locations for long periods of time," he said.
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Since the region has had little rain recently, the ground may not absorb heavy rainfall, further contributing to flash flooding.
Low-lying and poor drainage areas, as well as places along small streams, will be most susceptible to any flooding problems.
Even if no flash flooding ensues, commuters should prepare for slower travel. The downpours will create hazards for motorists by reducing visibility and heightening the risk of vehicles hydroplaning when traveling at highway speeds.

Anyone planning to spend time outdoors should seek shelter as soon as thunder is heard to avoid being struck by lightning.
However, the rain will bring longer-term benefits to the region.
Rainfall has become sparse in Louisiana and Texas this summer after an extremely wet spring.
San Antonio has barely seen any rainfall this July, recording only 0.01 of an inch through July 24. A total of 2.74 inches is more common this month.
Since the middle of June, rainfall has been held to 17 percent of normal in Houston.