Scattered storms and thunderstorms are expected to return to the region through the weekend, bringing risks of flash flooding and heavy rainfall to vulnerable terrain. This weather shift follows a period of high temperatures and follows a series of intense storms that occurred in mid-August.
Pattern Shift Brings Cooler Weather
A significant pattern change is underway as high pressure over the Four Corners breaks down, allowing moisture to intensify. The National Weather Service in Grand Junction reported on August 28 that this transition will likely lead to widespread precipitation chances across eastern Utah and western Colorado throughout the weekend.
As a result of this shift, daytime highs are expected to trend downward. The National Weather Service in Grand Junction noted that temperatures are expected to hover near or below normal as the pattern evolves into next week.
Severe Storm and Flood Risks
The threat of severe weather remains a concern for several areas. The National Weather Service in Grand Junction warned on August 28 that strong upper-level winds could create enhanced wind shear along and north of I-70, potentially triggering severe thunderstorms with damaging wind gusts.
In addition to wind threats, flash flooding is a primary concern for regions with susceptible terrain. On August 28, officials warned that localized heavy rainfall could lead to flash floods or debris flows, particularly in areas such as slot canyons, normally dry washes, and recent burn scars.
Increasing Moisture Levels
The current moisture surge is expected to be bolstered by tropical systems. According to a forecast from the National Weather Service in Grand Junction on August 28, moisture from a tropical system in the eastern Pacific may enhance the push of monsoonal moisture late next week.
Forecast models indicate that precipitation chances will remain high through the weekend. In Vernal, the National Weather Service forecast for Saturday, August 30, shows an 80 percent chance of showers and thunderstorms, with a 70 percent chance of showers and thunderstorms likely on Saturday night.
Salt Lake Valley Forecast
The forecast for Salt Lake City indicates a period of unsettled weather. On August 29, the National Weather Service forecast for the Salt Lake Valley shows a 70 percent chance of showers and thunderstorms for Saturday, August 30, with a similar chance for showers and thunderstorms likely on Saturday night.
By Sunday, August 31, the Salt Lake Valley is expected to see a 50 percent chance of showers and thunderstorms, with a 20 percent chance of isolated showers and thunderstorms on Sunday night.
Utility Safety and Outages
Rocky Mountain Power continues to monitor utility safety during weather events. The company maintains an outage map to help customers report and check the status of power outages.
The company noted that enhanced safety settings used to prevent wildfires can increase the potential for outages, as field crews must patrol lines before restoring power. Customers are advised to never touch or go near downed power lines.
Recent Weather Patterns
Looking back at the month, the region has faced intense weather conditions. On August 23, the National Weather Service in Salt Lake City reported that strong to severe convection had been impacting northern Utah, with some storms producing wind gusts in excess of 70 mph.
Earlier in the month, on August 11, the National Weather Service reported that monsoon moisture was facilitating scattered showers and thunderstorms across northern Utah, with a warning that such storms could bring threats of flash flooding and gusty outflow winds.
