* WHAT. Dangerously hot conditions with temperatures up to 100 to 105 possible, and upwards of 105 to 115 possible over interior valleys and foothills including the Antelope Valley. * WHERE. A portion of southwest California. * WHEN. From Tuesday morning through Saturday, July 06. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. Warm overnight low temperatures, especially late next week, will worsen the effects of extreme heat. * ADDITIONAL DETAILS. Very warm to hot conditions will have the potential to bring significant heat impacts to the coast, starting on Wednesday and continuing through the remainder of next week. Heat headlines may need to be expanded to include a larger portion of Southern California in later forecasts.

* WHAT. Dangerously hot conditions with temperatures up to 100 to 105 possible, and upwards of 105 to 115 possible over interior valleys and foothills including the Antelope Valley. * WHERE. A portion of southwest California. * WHEN. From Tuesday morning through late Friday night. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. Warm overnight low temperatures, especially late in the week, will worsen the effects of extreme heat. * ADDITIONAL DETAILS. Very warm to hot conditions will have the potential to bring significant heat impacts to the coast, starting on Wednesday and continuing through the remainder of the week. Heat headlines may need to be expanded to include a larger portion of Southern California in later forecasts.

* WHAT. Dangerously hot conditions with temperatures up to 100 to 110 expected, and upwards of 105 to 115 expected over interior valleys and foothills including the Antelope Valley. * WHERE. Portions of interior Southern California. * WHEN. From 11 AM Tuesday to 5 AM PDT Monday, July 08. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures up to 100 to 110 expected, and upwards of 105 to 115 expected over interior valleys and foothills including the Antelope Valley. * WHERE. Portions of interior Southern California. * WHEN. From 11 AM Tuesday to 5 AM PDT Monday, July 08. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures up to 100 to 110 expected, and upwards of 105 to 115 expected over interior valleys and foothills including the Antelope Valley. * WHERE. A portion of southwest California. * WHEN. Until 6 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures up to 114. * WHERE. A portion of southwest California. * WHEN. Until 6 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures up to 106 to 116 expected, except 100 to 110 in the mountains. * WHERE. A portion of southwest California. * WHEN. Until 6 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with high temperatures of 106 to 116 common, with very warm nights. * WHERE. Interior valleys and mountains of southwest California. * WHEN. Until 6 PM PDT Wednesday. * IMPACTS. There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.