Remnants of Hurricane Rachel are poised to bring widespread precipitation and an elevated threat of flash flooding to southern and central Utah through Thursday, according to a National Weather Service forecast issued Oct. 21. The system, which has been moving toward the region since mid-October, is expected to deliver heavy moisture to the area, creating a prolonged risk of flooding and severe thunderstorms across several Utah counties.
Flash Flood and Storm Threats
The National Weather Service in Salt Lake City issued a forecast on Wednesday night, Oct. 21, stating that a Flood Watch remains in effect through Thursday evening for several areas, including parts of southern and central Utah. The agency identified a Slight Risk of excessive rainfall, specifically a level 2 of 4 risk, for southern Utah on Thursday. Additionally, a Marginal Risk, or level 1 of 5, for severe thunderstorms is in place for southern and western Utah throughout Thursday.
Moisture and Storm Movement
Meteorologists noted that the current weather pattern is driven by a broad closed low approaching the California coast. As this system moves, it has allowed deep tropical moisture to move into the forecast area. Satellite-derived precipitable water levels are primarily in the 0.6 to 0.7 inch range, which the National Weather Service reports is above the 90th percentile for this time of year.
While convection is currently in a relative lull, showers and thunderstorms are expected to continue over southern Utah overnight. The main low is expected to move onshore on Thursday and split. One piece of the system is expected to eject northward across Utah and southwest Wyoming between late Thursday afternoon and early Friday. This movement is expected to cause convection to become more intense over southern Utah by early Thursday afternoon, with moisture and instability spreading northward into northern portions of the area.
The Path of Hurricane Rachel
The system's origins trace back to the tropical activity of Hurricane Rachel. On Oct. 8, 2026, the National Hurricane Center reported Tropical Storm Rachel with maximum sustained winds of 55 knots and gusts reaching 65 knots. By Oct. 11, 2026, the system had transitioned into the remnants of Rachel, located near 35.8N 114.6W, with maximum sustained winds of 30 knots and gusts up to 40 knots. The National Hurricane Center issued its final forecast advisory for the system on Oct. 11, noting that the center was moving toward the north-northeast.
Snowfall and Temperature Changes
The weather pattern is expected to shift significantly as the trough moves through the region. On Friday afternoon, the influx of colder air is expected to bring highs that are 5 to 10 degrees Fahrenheit below seasonal normals. This temperature drop will also lower snow levels to approximately 9,000 feet.
In the high terrain of northern and central Utah, the National Weather Service anticipates accumulating snowfall on Friday. While 1 to 4 inches of snow is likely above 9,000 feet, the agency noted there is a chance for locally higher amounts in favored locations. Although the north piece of the trough is expected to move out of the area by Friday, the presence of the southern branch of the low will keep temperatures on the cool side through the weekend.
Weekend and Long-Range Outlook
Looking further ahead, the National Weather Service expects a period of drier conditions to follow the main storm system. However, the southern branch of the low is expected to bring a few showers to at least southeast Utah from Saturday into Sunday as it tracks east across the Desert Southwest.
By the upcoming work week, weak ridging is expected to move over Utah and southwest Wyoming, which should lead to a slight warming trend. Despite this, the National Weather Service noted that the storm track is expected to remain active in some fashion next week, as there is no blocking ridge in place off the coast to halt the progression of weather systems.
Salt Lake City Forecast Details
For the Salt Lake City terminal, the National Weather Service expects VFR conditions through the overnight hours, with southerly winds continuing through Thursday. While there is a 30 percent chance of impacts to the terminal in the afternoon, gusty winds are expected to be the primary threat. Showers and storms are expected to become more widespread beginning early Friday evening, bringing an increased potential for gusty winds.
