Rachel’s remnants leave flood risk across the Great Basin
Federal forecasters kept a slight excessive-rainfall risk from northwest Arizona into much of Utah after Sunday’s heaviest rain.
The circulation moved north, but moisture stayed behind
The remnants of Rachel raced north into the central Rockies overnight, but flood and wind hazards continued Monday across parts of the Great Basin and Southwest. The Weather Prediction Center’s Sunday evening storm summary placed a 996-millibar surface low over southwestern Wyoming while locally heavy showers and thunderstorms affected the Great Basin and Four Corners region.
Flood watches covered much of the Great Basin at the time of that summary, and wind advisories extended across the Great Basin, Four Corners and Desert Southwest. The former tropical cyclone had lost its organized center, yet its moisture was interacting with a separate upper-level low and terrain across the interior West.
That distinction matters because the hazards no longer follow a simple tropical-storm track. Rainfall can be heaviest far from the remnant surface low, while higher terrain can experience strong gusts and colder precipitation.
Monday brings a smaller but overlapping flood zone
For Monday into early Tuesday, the Weather Prediction Center maintained a slight risk of excessive rainfall from northwest Arizona into much of Utah, including the Wasatch region. The agency expected lower totals than on Sunday but noted that new rain could overlap areas that had already received heavy precipitation.
Repeated rainfall raises runoff risk because soils and drainage systems have less capacity to absorb additional water. Slot canyons, desert washes, burn scars, steep slopes and urban low points can respond quickly even when the regional forecast total appears modest.
A slight risk is not a prediction that every community will flood. It identifies a corridor where scattered flash flooding is possible. Local flash-flood warnings, road closures and emergency messages provide the specific information needed for travel decisions.
Wind, mountain snow and local decisions
The same broad western storm pattern was expected to lower snow levels as an upper low moved through Nevada and toward the Arizona–Utah border. Federal forecasters said substantial high-elevation snow was possible through midweek in parts of Nevada, Utah, Wyoming and Colorado. That snow forecast involves the larger weather system and should not be attributed solely to Rachel.
Travelers crossing mountain passes should check current road and weather conditions along the entire route. Strong crosswinds can be hazardous to campers, trailers and other high-profile vehicles, while rain at lower elevations can become snow at higher elevations.
Residents should avoid driving through water and stay out of normally dry channels during storms. Water depth, current and pavement damage are difficult to judge from a vehicle.
The national outlook establishes the broad Monday pattern: the former tropical center is fading, the most intense rainfall has shifted, and an overlapping flood risk remains. Conditions will vary by elevation and county, so readers should use their local National Weather Service office for the newest warning status.