"We saw rainfall upwards of half an inch in 10 to 15 minutes," a National Weather Service meteorologist told The Arizona Republic.

In about 15 minutes, Tempe recorded nearly three-quarters of an inch of rain. A supercell thunderstorm forms when wind speed and direction change with height, a phenomenon called wind shear.

Tropical moisture from the remnants of Hurricanes Priscilla and Raymond pushed into Arizona, bringing days of showers and ...

A microburst with wind gusts up to 70 mph hit Tempe, leaving over 70 small businesses inoperable. The damage is so extensive that officials say several buildings may be demolished, forcing some ...