More than 150 million people across 30-plus states face a weeklong flash flood threat as moisture from Pacific tropical systems races inland, with the worst stretch expected by midweek.
Heavy rain and thunderstorms are set to roll from the Southwest into the Plains and Midwest after flash flooding already hit southern Nevada and parts of New Mexico on Monday. FOX Weather reported the multi-day danger is being fed by moisture from Hurricane Polo and Tropical Storm Rachel, with leftover moisture from the remnants of Odalys already in the mix.
A Flood Watch already covers a dozen states, and more states are expected to be added in the coming days. The threat is forecast to peak Wednesday and Thursday along a path that can stretch from Minnesota to the Texas-Mexico border.
Flash flooding struck parts of southern Nevada on Monday. In Laughlin, roads took debris flows as the water moved through. Further east, roads flooded in Crownpoint, New Mexico, according to images dated Sept. 28, 2026, and credited to the Navajo Police Department.
That early damage came as moisture from the remnants of Odalys worked across the region. An active monsoon season had already left parts of New Mexico and Grand Canyon National Park dealing with deadly flooding earlier in the season, raising the stakes for ground that cannot take much more water in some places.
Hurricane Polo made landfall in Baja California early Tuesday morning, and its remnants were expected to rush into New Mexico with intense rain and wind gusts of 50 to 60 mph. Widespread power outages were possible as that surge moved in.
Before that inland push, the New York Post reported Polo as a Category 3 storm with sustained winds near 115 mph aimed at Baja California Sur, with 6 to 12 inches of rain possible in parts of the peninsula and a clear risk of flash floods and mudslides. Mexican authorities urged coastal evacuations, suspended classes in Baja California and Sonora, and stationed navy personnel and soldiers for aid and shelters.
The National Hurricane Center urged residents in the storm’s path to finish preparations immediately, warning that conditions would deteriorate rapidly through the day. In a separate update described in the forecast coverage, the center had Tropical Storm Warnings up for the southwestern Mexico coast.
Reuters reported Polo had been tracked about 200 miles off the Baja California coast with sustained winds of 125 mph while moving north-northwest, with landfall expected to bring heavy rain, strong winds, and flooding and mudslide risks in the tourist region. The U.S. National Hurricane Center warned the rainfall could produce “life-threatening flooding and mudslides, especially in areas of steep terrain.” Related flooding in Jalisco had already killed two minors, with their parents missing after a home was swept away.
"life-threatening flooding and mudslides, especially in areas of steep terrain"
Tuesday’s flood threat targeted about 33 million people across the Southwest and Central Plains. Heavy rain was expected to build across the Four Corners, the Texas and Oklahoma Panhandles, and parts of the Central Plains.
A Level 3 out of 4 flash flood risk covered more than 230,000 square miles across southern and eastern Arizona, much of New Mexico, southern Colorado, southwestern Nebraska, and the Texas and Oklahoma Panhandles. If that risk area were a state, it would rank as the third largest behind only Alaska and Texas.
Northern New Mexico sat inside that elevated zone as Polo’s moisture moved in. Separate Level 3 pockets were also flagged later for southern Colorado and extreme northern New Mexico as the pattern evolved.
Polo’s moisture was expected to keep fueling the Southwest and Central U.S. flood threat through Wednesday. From late Wednesday through Friday, moisture tied to Tropical Storm Rachel was forecast to feed additional heavy rain across Texas, the Southern Plains, and the Midwest.
Wednesday and Thursday were identified as the peak window. In Oklahoma and Central Texas, storms could pour out up to 3 inches of rain per hour under a Level 3 risk. The broader threat line was described as reaching from Minnesota down to the Texas-Mexico border before gradually shifting east later in the week, with Oklahoma and Texas remaining in the center of the action for a stretch.
Dallas sits in the path of a significant flood threat after a long dry spell. The city had not seen measurable rain since July 16, leaving ground conditions that can limit how fast water soaks in when intense storms finally arrive.
Forecast totals for the week point to a massive volume of water. Nearly 80 trillion gallons could fall across the threatened region, enough, the forecast coverage noted, to fill more than 122 million Olympic-sized swimming pools.
That kind of runoff does not need a coastal landfall to do real damage. Short-period downpours on already wet ground, debris-choked washes, and urban drainage systems that cannot keep up are enough to turn routine travel into a hazard, as Monday’s flooded roads already showed.
A jet-stream dip is helping pull the tropical moisture north, which is why a Pacific hurricane and a tropical storm can reshape flood risk deep into the Plains and Midwest. The pattern keeps the door open for repeated rounds of storms rather than a single afternoon of rain.
Communities under these watches do not get a vote on the track. They get a choice about readiness, and this week’s map leaves very little room for delay.
