Houston Weather Alert: Severe Storms & Flash Flood Threat Today

Soggy skies are about to slam Southeast Texas just as May begins, and Houston is bracing for its first widespread flood threat of the warm-season. Forecasters at the National Weather Service have blanketed nearly every county surrounding the Bayou City in a Flood Watch from 3 a.m. Friday through 4 a.m. Saturday. Several rounds of slow-moving thunderstorms are expected to sweep east out of the Hill Country, tapping Gulf moisture and wringing out 2–4 inches of rain across the metro. Isolated bull’s-eyes could collect 5 inches or more, quickly overwhelming streets and underpasses that already struggled with runoff earlier this week. Timing • Pre-dawn Friday: First band of storms reaches Katy and The Woodlands, dropping heavy rain before most morning commuters hit the road. • Morning rush hour: Intermittent lightning and tropical-style downpours make travel hazardous on I-10, I-45 and Beltway 8; brief street flooding is possible. • Mid-afternoon: A second, stronger complex slides southeast, with rainfall rates topping 2 in./hr. Minor bayous such as White Oak and Brays could jump their banks during this window. • Evening events: Storms taper to scattered showers, but ponding water will linger on frontage roads and low-lying neighborhoods. Threats • Flash flooding: The greatest risk sits northwest of downtown—from Cypress to Conroe—where soils are saturated and creeks respond fastest. • Power outages: Gusty downdrafts may topple tree limbs onto lines; keep phones charged. • Travel delays: Hobby and Bush Intercontinental can expect ground stops during peak lightning bursts; check flight status if you’re headed out for Mother’s Day weekend. How unusual is early-May flooding? Houston averages its wettest days between April 25 and May 10, when the jet stream still dives far enough south to spark spring squall lines, yet Gulf humidity already feels midsummer-thick. In 2015 the infamous Memorial Day flood arrived on virtually the same timeline, underscoring why meteorologists warn that “tax day to Mother’s Day” is flash-flood season along the Upper Texas Coast. Preparedness checklist • Download a reliable radar app and enable lightning alerts. • Never drive across a water-covered road; just 12 inches can sweep away most vehicles. • Clear storm drains around your driveway tonight to help water escape tomorrow. • Stock the car with snacks, a phone charger and patience—gridlock grows quickly when feeder roads flood. Silver lining: a weekend reward Once the final band exits before sunrise Saturday, a rare taste of spring slides in. Sunshine, lower humidity and highs in the upper 70s will dominate Saturday and Sunday, providing ideal conditions for patio brunch and the Astros’ homestand—all without the daily rumble of thunder. Bottom line Friday is a textbook Houston flood setup: tropical moisture, a stalled boundary and training thunderstorms. Plan for disrupted commutes, monitor trusted weather sources and give bayous room to rise. By the weekend, the city swaps rain boots for sunglasses, but Friday’s flash-flood punch demands respect first.