Extreme Heat Warning

* WHAT...Thunderstorms will initially develop over the Mogollon Rim and other sky islands of Southeast Arizona, then track southwest into the valleys of Southeast Arizona and become widespread during the late afternoon, then move across the lower deserts of Southeast Arizona through the evening. The stronger storms will produce organized thunderstorm outflow winds between 45-55 mph, resulting in dense blowing dust with visibility between one-quarter and one-half mile and possibly a haboob with near-zero visibility. For the Extreme Heat Warning, dangerously hot conditions with temperatures 105 to 110. Major to Extreme HeatRisk is expected.

* WHERE...South central and southeastern Pinal county, Tohono O'odham Nation, and Western Pima County.

* WHEN...For the Extreme Heat Warning, until 8 PM MST this evening. For the Blowing Dust Advisory, until 10 PM MST this evening.

* IMPACTS...Hazardous driving conditions due to reduced visibility. Heat related illnesses increase significantly during extreme heat events.