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The original item was published from 6/17/2021 9:00:00 AM to 6/17/2021 11:12:18 AM.

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NEWS - Emergency Preparedness

Posted on: June 15, 2021

[ARCHIVED] NWS Issues Heat Advisory and Excessive Heat Warning Wednesday-Friday

Preparing for Hot Weather

The National Weather Service has issued a HEAT ADVISORY (temperatures up to 94-102 expected) from 11:00 AM Wednesday to 11:00 AM Thursday. This is immediately followed by an EXCESSIVE HEAT WARNING (dangerously hot conditions with temperatures from 98 to 108 expected) from 11:00 AM Thursday to  9:00 PM on Friday for the East Bay. 

Additionally, overnight temperatures will only cool into the 70s if not lower 80s in the hills, ridges, and peaks. 

Temperatures will increase on Wednesday, with the hottest day of the week on Thursday. While temperatures reduce on Friday, they will still be hot. 

Extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.

A Spare The Air Alert is in effect through Thursday. Wood Burning is banned.

The California Independent System Operator (CAISO) has issued a Flex Alert for Thursday, June 17th asking consumers and businesses to conserve energy between the hours of 5pm to 10pm.


  • Drink plenty of fluids
  • stay in an air-conditioned room
  • stay out of the sun
  • check up on relatives and neighbors
  • Young children and pets should never be left unattended in vehicles under any circumstances
  • Watch for hot pavements when walking dogs
  • If you don't have air conditioning, seek out public buildings with a/c, such as the Danville Library

Cooling Centers in Contra Costa County

Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. 

Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

For more information go to 

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