In the early morning hours (just before 4am MST) of September 26, 2019, a strong thunderstorm moved through the Spring Valley area in Yavapai County. A Severe Thunderstorm Warning was issued by the National Weather Service office in Flagstaff at 3:48 AM MST, continuing through 4:15 AM MST. Damage to several mobile homes and at least one power pole has been reported. A storm survey was conducted and it was determined that straight line winds around 75 mph was the likely culprit. Along with the strong storm, a Flash Flood Watch was in effect for Yavapai County. There were reports around the county of localized flooding throughout the morning hours.

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Radar Reflectivity from 3:28am MST to 4:02am MST as the storm moved through Spring Valley.

Radar velocity of the storm as it moved through Spring Valley. There was some weak rotation noted on the radar with this storm as it approached Spring Valley.

• September 26, 2019 at 3:48 AM MST:  A strong thunderstorm was detected on radar by staff at the NWS Flagstaff office. A Severe Thunderstorm Warning was issued.


• September 26, 2019 at 4:15 AM MST:  The storm showed signs of weakening at 4:15 AM MST and the Severe Thunderstorm Warning expired.


• September 26, 2019 at 9:00 AM MST:  Fire emergency management called the NWS Flagstaff office to make them aware of considerable damage to mobile homes and at least one power pole in Spring Valley. The area was without power for several hours.


• September 26, 2019:  An NWS Storm Survey team traveled to Spring Valley and conducted a storm survey. It was determined that straight line winds around 75 mph was the likely culprit.