Extreme Heat Warning Extreme Heat Warning issued August 2 at 2:07PM MST until August 3 at 8:00PM MST by NWS Tucson AZ Effective 2:07 PM MST, Sun Aug 2 through 8:00 PM MST, Mon Aug 3 Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening.… https://www.weather.gov/twc/