Severe Thunderstorm and Excessive Heat Warnings Issued for Maricopa County

The National Weather Service has declared severe weather warnings for Maricopa County in Arizona, with a severe thunderstorm warning starting at 3:33 p.m. and an excessive heat warning starting at 12:26 p.m. Both warnings have specific expiration times, with the severe thunderstorm warning ending at 4:15 p.m. on June 20, and the excessive heat warning expiring at 4:00 a.m. on June 21.

Climate Data and Urban Heat Effect

Climate data from the federal government indicates a significant increase in temperatures in the Southwest over the past decade. This region has experienced the most pronounced warming in the country, a change attributed to the influence of global warming, as stated by federal meteorologists. The urban "heat-island" effect has notably contributed to the rise in temperatures in developed areas like Phoenix and its surrounding areas. This effect occurs as exposed asphalt, concrete, and roofs absorb heat from the sun, leading to higher temperatures compared to the surrounding desert.

Impact on Driving and Safety Tips

For individuals driving in the rain, the Arizona Department of Transportation has provided safety tips, including inspecting and replacing windshield wipers before expected rainfall, turning on headlights, reducing speeds, avoiding sudden braking on wet pavement, maintaining a "space cushion" between vehicles, and steering clear of areas with pooled water in travel lanes.

The National Weather Service has outlined safety measures to protect against lightning strikes. These include seeking shelter in a building with plumbing and wiring, staying inside a vehicle, avoiding open water, refraining from showering or bathing, and not using electric appliances with plugs or cords. Additionally, the "30-30 rule" is recommended, where individuals should wait at least 30 minutes after hearing the last thunder before going outside.

Heat-Related Illness Prevention

The Arizona Department of Health Services has shared tips to prevent heat-related illnesses, advising individuals to stay hydrated, wear light-colored clothing, apply sunscreen, consume smaller and frequent meals, monitor those at risk, engage in strenuous activities during the coolest hours of the day, stay indoors, and take regular breaks in a cool environment when engaging in physical activities on hot days.