This is not the week to take up running in the Valley.
With triple-digit temperatures forecast through Friday across the region, public health officials have issued a heat advisory for parts of Los Angeles County, and the National Weather Service forecasts "excessive heat" and "oppressive conditions" in and around the San Fernando, San Gabriel, Santa Clarita and Antelope Valleys.
Officials are urging everyone to wear light, loose clothing, drink plenty of water, check on friends and neighbors and stay out of the sun as much as possible.
Prolonged hot temperatures can create potentially dangerous heat-illness situations. People without air-conditioning are advised to visit public facilities, and warned against leaving kids, elderly folks and pets unattended in vehicles, as temperatures inside cars can quickly rise to life-threatening levels, even with windows cracked.
This week's blistering heatwave comes day after a study by NASA scientist James Hansen -- a man often called the "godfather of global warming" -- asserts that statistically what's happening can't be anything other than man-made climate change.