A moderate risk for excessive rainfall has been identified for central and southern Utah as tropical moisture moves into the region, according to the National Weather Service. The influx of moisture, which may exceed 200% of seasonal normal values, brings potential for flash flooding and isolated severe weather through Monday, September 7, 2026.
Moisture and Rainfall Risks
The National Weather Service Salt Lake City reported on Sunday, September 6, 2026, that moisture associated with Hurricane Marie is phasing into the upper flow. This moisture is expected to push north across much of Utah, with precipitation levels potentially exceeding 200% of normal values.
Weather Prediction Center guidance has outlined a slight risk, or level 2/4, for excessive rainfall across central and southern Utah. While rainfall rates are expected to be between 0.3 and 0.5 inches per hour at their highest, the anomalously moist airmass continues to raise concerns for flash flooding in those areas.
Wind and Severe Weather Threats
The weather pattern is also producing gusty winds across much of Utah and southwest Wyoming. The National Weather Service Salt Lake City noted on September 6, 2026, that gusts in the 25-35 mph range are expected, with areas west of I-15 potentially seeing gusts that approach or exceed 45 mph due to stronger winds aloft.
In addition to wind and rain, an isolated severe weather threat exists for far northwest Utah. The National Weather Service Salt Lake City reported that this threat may include isolated wind gusts of approximately 58 mph and sub-severe hail measuring less than 1 inch.
Current Regional Conditions
The National Weather Service Grand Junction reported on the evening of September 6, 2026, that a rich plume of tropical Pacific moisture is advecting across the region, with precipitable water levels near one inch.
While some areas in northeast Utah have seen showers training over the previous six hours, totals have remained limited to a few hundredths of an inch. The agency expects showers and thunderstorms to continue through Monday morning, with the potential for isolated stronger storms capable of producing flash flooding.
Forecast Outlook for Midweek
The current active weather pattern is expected to transition toward drier conditions by the middle of the week. The National Weather Service Grand Junction reported that a Pacific Northwest trough and building high pressure will lead to a drier zonal flow over eastern Utah and western Colorado by midweek.
Although a wetter pattern is expected to return, forecasts for the remainder of the week show low confidence. Ensemble guidance suggests a 50% chance of moisture return around the Thursday and Friday timeframe, with roughly 80% of ensemble members supporting precipitation by the weekend.
Safety and Monitoring
For residents in affected areas, the National Weather Service provides resources for tracking flash flood potential and real-time weather updates. Localized heavy rains and runoff issues remain a concern as the moisture-rich airmass moves through the region.
Ongoing Monitoring
The National Weather Service continues to monitor the progression of the moisture axis. While the current high moisture content yields concern for flash flooding in central and southern Utah, the progressive nature of the incoming fronts may limit the duration of heavy precipitation events.
Regional Rainfall Outlooks
The Weather Prediction Center has issued specific outlooks for various regions. While Utah faces moderate risks, other areas like northwestern Montana and the Upper Mississippi Valley have also been identified for potential excessive rainfall or marginal risks of heavy precipitation.
