Heatwave: Thunderstorms possible on Sunday, 5th Flex Alert

BREAKING NEWS: A flash flood warning is in place for parts of the San Bernardino County Mountains, including Lake Arrowhead, Running Springs and Rimforest, Sunday from 2 p.m. to 5 p.m National Weather Service.

ORIGINAL POST: The extended Southern California heatwave continues Sunday with another flex alert and the possibility of thunderstorms over the mountains, deserts and some valleys.

The seemingly never-ending heatwave is likely to last until next Wednesday, and possibly longer, according to the National Weather Service.

Excessive heat warnings are in place for parts of Los Angeles, Ventura, Orange, Riverside and San Bernardino counties.

Meteorologists call for temperatures well above average in all areas:

  • Coastal: 80-95 degrees
  • Valleys: 100-113 degrees
  • Mountains: Up to 105 degrees
  • Deserts: 105-113 degrees

Residents are urged to wear light and light-colored clothing, stay hydrated and avoid outdoor activities during the heat of the day.

To reduce energy stress on the power grid, the California Independent System Operator (ISO) has issued a Flex Alert for the fifth straight day.

Consumers are urged to conserve energy between 4pm and 9pm by setting thermostats to 78 degrees or higher, avoiding the use of large appliances and turning off all unnecessary lights.

According to Cal ISO, consumer response to the Flex Alerts has helped ease strained conditions on the power grid.

The National Weather Service is warning some Southland residents of a chance of rain.

There is a impending monsoon storms Sunday over the mountains, deserts and parts of the valleys.

Heavy downpours could strike quickly, with possible local flooding, high winds, hail and frequent lightning.

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