SPC Severe Thunderstorm Watch 689

WW 689 SEVERE TSTM AZ 212035Z - 220400Z URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 689 NWS Storm Prediction Center Norman OK 135 PM MST Wed Oct 21 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central and Southern Arizona * Effective this Wednesday afternoon and evening from 135 PM until 900 PM MST. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Thunderstorm coverage is expected to increase this afternoon and evening across portions of central and southern Arizona. Recent sounding from PHX sampled an unstable and strongly sheared environment supportive of supercells. Primary hazards with these storms are large hail and strong gusts. Isolated very large hail (i.e. 2"+ in diameter) and a brief tornado could also occur. The severe thunderstorm watch area is approximately along and 55 statute miles north and south of a line from 55 miles northwest of Gila Bend AZ to 35 miles east of Safford AZ. For a complete depiction of the watch see the associated wa...