The primary threats were wind and hail with a low probability threat of a few tornadoes.įig. At 11:45 AM MST the SPC in coordination with NWS offices in Phoenix, Tucson, Flagstaff, and Las Vegas issued a Severe Thunderstorm Watch for most of Arizona. 6, 2021.Īt 5:40 AM MST on October 5, the Storm Prediction Center (SPC) upgraded their Day 1 Convective Outlook to include a Slight Risk for severe thunderstorms in Central Arizona. In addition to the hail, some thunderstorms produced damaging winds and heavy rainfall with localized flash flooding.įig. With cold air aloft and unstable conditions, most thunderstorms produced at least small hail and the strongest thunderstorms produced large hail up to 1.5 to 2 inches in diameter (ping-pong ball to lime sized). The most notable and attention-grabbing impact from thunderstorms on Tuesday was hail. Initially showers and thunderstorms were relatively weak, but increased in intensity through the day Tuesday as the upper level low gradually progressed through the region. Credit: Spike Davis (left) & William Pitts (right).Ī strong low pressure system led to the development of scattered showers and thunderstorms across Arizona and southern California beginning on Monday October 4th and lasting through the evening of Tuesday October 5th. Images of the supercell that moved through Phoenix and estimated ping-pong ball sized hail that fell between Phoenix Sky Harbor Airport and South Mountain. Impacts: Supercells with large hail, strong winds, and heavy rainįig. Last updated at 700 PM MST on October 14, 2021
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