Hurricane Simon Moisture Triggers 1,000-Mile Flash Flood and Severe Weather Threat for 40 Million Across US Central Plains and Midwest

Key Points

• Expansive Severe Threat: A weather system stretching over 1,000 miles from Texas to Illinois poses severe thunderstorm and flood risks for more than 40 million residents.
• Tropical Moisture Source: Deep tropical moisture from Hurricane Simon, currently a Category 1 storm off western Mexico, is being funnelled north by a sharp dip in the jet stream.
• Severe Weather Hazards: Severe storms expected on Tuesday carry risks of damaging wind gusts, large hail, and low-end tornado threats across the Plains and Midwest.
• Multiday Flash Flood Warning: Persistent rainfall will drive a flash flood threat from Tuesday through at least Thursday, with widespread totals of 1 to 2 inches anticipated.
• Escalating Threat Levels: Flood threat severity elevates to Level 2 out of 4 by Wednesday across western Kansas, Missouri, and western Illinois.

Texas 24 News (T24N) October 13, 2026 – A massive weather pattern stretching over 1,000 miles across the U.S. Plains and Midwest is bringing severe thunderstorms and a multiday flash flood threat to more than 40 million people. Deep tropical moisture from Hurricane Simon, churning off the coast of western Mexico, is funneling northward and interacting with a storm system emerging from the Rockies. The system will bring damaging winds, large hail, potential tornadoes, and heavy rainfall from Texas to Illinois through at least Thursday. Widespread rainfall totals of 1 to 2 inches are forecast across the affected region.

How Is Hurricane Simon Enhancing Storms Across the Central United States?

As reported by meteorologists at the FOX Forecast Center, moisture originating from Hurricane Simon is being pulled northward by a significant dip in the jet stream, directly fueling severe weather activity across the central United States. As documented by photojournalist Brandon Bell of Getty Images, severe rainfall and flash flooding have previously caused significant disruptions along the Guadalupe River in Center Point, Texas, requiring emergency evacuations and multiple water rescues.

Hurricane Simon, currently classified as a Category 1 storm after reaching Category 4 intensity over the weekend, has stalled just off the coast of western Mexico. Although Simon has not yet made landfall, it continues to unleash torrential rains causing life-threatening flash floods and landslides along the Mexican coastline. Forecasters expect the storm to linger offshore before making landfall on Friday or Saturday.

Meanwhile, a low-pressure disturbance moving east out of the Rocky Mountains on Tuesday is tapping directly into this tropical atmospheric river. The collision between the trough and warm tropical air has triggered severe storm warnings and flash flood alerts spanning more than 1,000 miles.

Which Regions Face the Highest Risk of Severe Weather and Flash Flooding on Tuesday?

According to meteorological advisories issued by the FOX Forecast Center, a Level 2 out of 5 severe storm risk has been established for Tuesday across the Texas Panhandle, the Oklahoma Panhandle, and portions of Kansas and Missouri. Primary severe weather threats include high wind gusts, large hail, and a low-end threat of tornadoes.

Concurrently, a Level 1 out of 4 flash flood threat covers northern Texas, Oklahoma, Kansas, and Missouri. As reported by meteorologists at the FOX Forecast Center, scattered downpours are expected to generate isolated flash flooding in urban areas and low-lying river basins.

Where Will the Flash Flood Threat Intensify and Shift on Wednesday and Thursday?

As detailed by weather tracking reports from the FOX Forecast Center, the storm system will intensify on Wednesday while shifting slightly eastward. The flash flood risk will elevate to a Level 2 out of 4 threat across western Kansas, most of Missouri, and western Illinois. Major metropolitan areas located within this heightened risk zone include Kansas City, Missouri; St. Louis, Missouri; and Wichita, Kansas.

By Thursday, the main corridor of heavy precipitation is projected to track northeast into the Upper Midwest and Great Lakes region. Repeated rounds of heavy rain over saturated soil will sustain flash flood conditions across the Ohio Valley. Total cumulative rainfall between 1 and 2 inches is anticipated from Northern Texas through parts of the Ohio Valley, directly impacting over 40 million residents.

Background of the Development

The development of severe weather systems across the central U.S. driven by tropical remnants is a well-documented atmospheric phenomenon during the late summer and autumn months. When tropical cyclones form in the Eastern Pacific off the coast of Mexico, strong upper-level troughs or dips in the jet stream over the western United States can act as atmospheric vacuums. These jet stream configurations draw tropical moisture thousands of miles inland across the North American continent.

In this instance, Hurricane Simon’s slow movement off Mexico’s western coastline provided a continuous reservoir of warm, moisture-laden air. When this moisture collides with cooler continental air masses pulled down by low-pressure systems moving off the Rocky Mountains, severe instability occurs. Similar historical interactions have produced significant multi-state flood events across the U.S. Plains and Midwest, demonstrating how offshore Pacific storms can trigger severe inland weather hazards far from their point of landfall.

Prediction: How This Development Can Affect the Population

This prolonged multi-day weather event poses direct challenges for the 40 million residents residing within the 1,000-mile impact corridor stretching from Texas to Illinois:

• Transportation and Commuting Disruptions: Repeated downpours and flash flooding will create hazardous driving conditions along major interstate highways, including key routes connecting Kansas City, St. Louis, and Wichita. Low-lying roadways and underpasses are at high risk of sudden inundation.
• Property and Agricultural Risks: Flash flooding, combined with large hail and damaging winds, threatens commercial and residential properties. Agricultural producers in the Plains and Midwest may experience localized crop damage and field saturation during critical harvest periods.
• Emergency Infrastructure Strain: Municipal storm drainage systems in urban centres under Level 2 flood threats may become overwhelmed by swift runoff, potentially prompting localized evacuations and demanding increased emergency response and water rescue operations.