200+ mm: Significant rainfall, flood threat for the U.S. Gulf Coast
Flood watches and warnings are active for parts of the U.S. Gulf Coast, with 100-200+ mm of rain expected through midweek. Authorities caution against flooded areas and warn of potential tropical cyclone development
Flood watches and warnings are in effect across southeast Texas, central Louisiana, and southwest Mississippi as the Gulf Coast region braces for significant rainfall.
The U.S. National Weather Service is warning of potential life-threatening flooding, with forecasts indicating 100-200+ mm of rainfall through mid-week in the affected zones. Some rivers may rise above flood stage by Monday, but are expected to recede by Tuesday.
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What's behind this heavy rainfall?
A stationary front over the Gulf states, combined with a disturbance in northwestern Gulf of Mexico, is creating a prolonged period of instability. This system is pulling moisture from the Gulf of Mexico, resulting in heavy rain and training thunderstorms.
The National Hurricane Center (NHC) now gives this area of disturbed weather a 60 per cent chance of tropical cyclone development over the next seven days.
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The disturbance is expected to drift northeastward, where environmental conditions may improve for development by midweek.
Regardless of tropical development, heavy rainfall and gusty winds will impact the Gulf Coast. Authorities are urging residents to stay vigilant, avoid flooded areas, and heed road barricades.
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The Atlantic hurricane season has officially started and will continue through the end of November. This year, NOAA is forecasting a below-average hurricane season, with expectations for 8-14 named storms, 3-6 hurricanes, and up to two major hurricanes reaching Category 3 or higher.
El Niño, which has now been officially confirmed, is a key factor in this forecast. El Niño typically reduces tropical cyclone activity in the Atlantic basin due to stronger, upper-level winds that can disrupt storm formation.
Looking ahead, El Niño is projected to strengthen further as the region moves into the winter of 2026-27, potentially influencing global weather patterns beyond this hurricane season.
Stay updated on evolving conditions, and remember, even a small amount of moving water can pose significant dangers.