The National Weather Service placed central and southern Utah under a flood watch starting Monday, Sept. 28, according to a September 29 report. Tropical moisture from Hurricanes Polo and Odalys is expected to push into the state through Tuesday, Sept. 29.
Alpine, Highland, Cedar Hills, and Lehi fall within a 15% flash flood risk zone extending along and south of Interstate 80, according to ABC4 Utah meteorologist Noah Price. Southern Utah faces a steeper threat, with the Weather Prediction Center issuing a Day 3 Moderate risk, indicating a 40% chance of flash flooding within 25 miles of any point in that zone. Price noted that the Moderate designation is unprecedented for the region, stating the flood threat confidence continues to increase as the Weather Prediction Center issued the risk for excessive rainfall across southern Utah for the first time ever.
Hurricane Polo, which recently held Category 5 strength, is pulling moisture northward from the eastern Pacific. Hurricane Odalys is also contributing moisture as it tracks northeast near Polo. An upper-level low over the Great Basin will steer this moisture into Utah, where a cold front could produce heavier thunderstorms, Price reported. Additionally, Fox Weather hurricane specialist Bryan Norcross reported that NOAA's Weather Prediction Center showed a 3-out-of-4-level risk of flash flooding around the Four Corners region involving Arizona, New Mexico, Colorado, and Utah.
The National Weather Service forecast for Lehi included likely showers on Monday with a high of 72°F and a low of 50°F Monday night. Tuesday's forecast predicted mostly sunny skies with a high of 73°F, while drier conditions are expected to return by Wednesday and Thursday as high pressure moves in. The NWS also noted that severe to extreme drought conditions persisted across much of Utah as of August 2026, though the agency did not link the drought to this storm's flood risk.
As of Sunday, Sept. 27, the Lone Peak Fire District, Lone Peak Police Department, Lehi Police Department, and local emergency management had not posted public statements regarding the storm. Residents can monitor current watches and warnings via the NWS Salt Lake City website.
