Beware Dallas: Dangerous, disruptive flash flood threat looms

As a strong push of Canadian air swings across the southern Plains, the handoff from very warm to cool conditions will set off torrential downpours that may not only ease short-term drought conditions but may also lead to dangerous flash flooding in portions of north-central and northeastern Texas, including the Dallas/Fort Worth Metroplex from late Wednesday to Thursday morning, AccuWeather meteorologists warn.

Should the situation escalate to its full potential, a life-threatening flash flood situation could unfold along portions of interstates 20, 30, 35 and 45 in the area near Dallas.

Along with the risk of severe thunderstorms packing strong winds and hail, there is the potential for hourly rainfall to exceed 1 inch, which can easily overwhelm storm drains and catch basins, as well as cause dry streambeds to rapidly fill with rushing water.

When the ground is very dry and hard-packed like it is now, it can behave much like concrete or pavement, AccuWeather Meteorologist Jake Sojda said.

“After an extensive lack of rain, it can take time for the ground to soften [when rain returns] and then become more ‘spongelike’ and able to more effectively absorb rainfall once again,” Sojda explained.

A general 2-4 inches of rain will fall on the zone from northeastern Texas to western Arkansas and eastern Oklahoma from Wednesday to Thursday. At the local level, there is the possibility that 6 inches of rain will pour down within several hours.

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AccuWeather meteorologists expect the heaviest rain and worst travel conditions from flash flooding to occur in the Dallas area from Wednesday evening to Wednesday night as storms build in from the west.

AccuWeather forecasters urge motorists to be prepared for major delays, as some roads may become blocked by high water. Even seemingly shallow areas of water may be subject to a rapid rise that can strand vehicles and create a life-threatening situation in a matter of a few minutes.

Making sure storm drains are free of debris and avoiding parking in low-lying areas that are prone to flooding during torrential downpours are also good measures to take, experts say.

Even though the heaviest rain may shift to the east of Dallas around daybreak Thursday, the effects from areas of torrential rain and flooding may linger into the morning commute.

There is the potential for torrential rain to extend southward toward the Gulf Coast, affecting travel and outdoor activities in part of the Houston area from Thursday to Thursday evening.

“After an abnormally warm September [and a blistering summer] in the southern Plains and Texas, temperatures more akin to autumn are finally forecast to sweep the region,” AccuWeather Senior Meteorologist Courtney Travis said.

In the wake of the cold front and its associated showers and thunderstorms, temperatures will be slashed by 10-20 degrees with much lower humidity levels later this week. The air should feel the coolest it has been since last spring over much of the Lone Star State and neighboring Oklahoma.

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