The National Weather Service (NWS) has issued flash flood warnings for parts of the Four Corners region as monsoonal thunderstorms intensify across the area. The warnings cover portions of southwestern Colorado, northwestern New Mexico, southeastern Utah, and northeastern Arizona. Heavy rainfall is expected through Friday, increasing the risk of localized flash flooding, especially in areas with burn scars. Erinanne Saffell, a climatologist at Arizona State University, explained that the summer monsoon structure in the Southwest brings moisture from the South that can lead to the formation of thunderstorms, resulting in potential flash flooding, lightning, strong winds, and microbursts.
The risk of flash flooding in the Four Corners region is heightened due to the nature of its soil—clayey soils are not good at absorbing moisture, making runoff more likely. Other risks associated with monsoon thunderstorms in the area include dust devils, gustnadoes, and hail. The NWS Forecast Office Salt Lake City, Utah advised residents to monitor the latest forecasts and be prepared for possible flood warnings. Those living in flood-prone areas should be ready to take action if flooding occurs. The office also highlighted specific locations, such as slot canyons, dry washes, recent burn scars, and low-lying flood-prone areas, that may be particularly susceptible to flash flooding.
Saffell cautioned drivers in the Southwest to be aware of potential flash flooding risks, especially on highways that cross over flash flooding channels that can fill during a flood event. It is important for drivers to understand where the rains may go and where they are driving to stay safe from potential flash flooding. Monsoonal thunderstorms across the Four Corners region may result in excessive rainfall and isolated incidences of flash flooding through Friday, especially in burn scar locations. Elevated to critical fire weather conditions are also forecasted in the Great Basin and Intermountain areas. The combination of excessive rainfall and dry, burn-scarred areas poses an increased risk of flash flooding and other weather-related hazards in the region.
Overall, the warnings issued by the NWS highlight the potential dangers of monsoonal thunderstorms in the Four Corners region, particularly in areas with burn scars. Residents are advised to stay informed of the latest forecasts, be prepared for possible flood warnings, and take necessary precautions to protect themselves and their property from flash flooding and other weather-related risks. By understanding the nature of monsoonal thunderstorms and the specific risks associated with them, individuals can better navigate potential hazards and stay safe during severe weather events in the Southwest.
