Mount Lemmon Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Mount Lemmon.

Use the Radar Maps link provided to understand the trajectory of a storm.

Extreme Heat Warning issued June 11 at 4:30AM MST until June 11 at 8:00PM MST by NWS Flagstaff AZ

* WHAT...Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 102 degrees at Havasupai Gardens, to 110 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...From 10 AM this morning to 8 PM MST this evening. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.