This Saturday is shaping up to be a washout for parts of the South, as the National Weather Service (NWS) has issued a thunderstorm warning for Arkansas, Louisiana, Oklahoma, and Texas. The culprit: a slow-moving storm system that's already dumping torrential rain, with some areas seeing up to 2 inches per hour.
According to the NWS advisory, the heaviest activity is concentrated south of the Interstate 20 corridor, with a gradual push northward. Radar and satellite imagery show persistent, slow-moving convection, particularly between Corsicana and Fairfield, Texas, where rainfall rates have exceeded 2 inches per hour. The atmosphere is primed for efficient rain production, with deep warm-layer clouds and high precipitable water values near 2 inches.
While instability is somewhat limited, forecast models suggest the heavy rain will continue through the late morning and into midday, moving toward the Dallas-Fort Worth area and along I-20. The latest HRRR model indicates potential rainfall totals of 3 to 6 inches between Dallas, Tyler, and Fairfield, with lighter amounts elsewhere. This has prompted concerns about flash flooding, especially through 1 p.m. local time.
The NWS has urged residents in the affected areas to stay alert and take precautions. Here are some key safety tips:
- Never drive through flooded roadways—turn around, don't drown.
- Monitor local weather updates and heed any warnings.
- Move to higher ground if flooding is imminent.
- Avoid outdoor activities during the storm.
This storm comes on the heels of other severe weather events across the country, including a deadly rain threat that has already impacted several states. The region is no stranger to intense weather, but the rapid rainfall rates could strain drainage systems and cause rapid flooding in low-lying areas.
Forecasters are keeping a close eye on the system as it evolves. The NWS notes that while the mixed-layer CAPE is generally 500 J/kg or less, the high precipitable water values are the main driver of the heavy rain. This means even without strong thunderstorm dynamics, the sheer moisture content can produce significant rainfall.
For those living in the affected zones, it's crucial to stay informed and be prepared. The NWS advises having an emergency plan in place and staying connected to local alerts. The storm is expected to move out by the afternoon, but the aftermath could leave some areas dealing with localized flooding.
As the weekend progresses, residents are encouraged to check on neighbors and avoid unnecessary travel during the worst of the weather. The NWS will continue to update advisories as conditions change.
