San Bernardino County, CA
Alerts
Alerts are listed in order of start time and level of severity. Click on the alert title to read details for each alert.
In effect from Sunday 07/26 11:14 AM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS San Diego CA
What
Dangerously hot conditions with high temperatures of 100 to 109 and low temperatures in the low 70s to low 80s.
Where
Apple and Lucerne Valleys.
When
Until 8 PM PDT Monday.
Impacts
Heat related illnesses increase significantly during extreme heat events.
Additional Details
Areas of major HeatRisk. Elevated low temperatures will limit overnight relief from the heat.
What to Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Areas Impacted
- Apple and Lucerne Valleys
Tips to Stay Safe
An Extreme Heat Warning means that extremely dangerous heat conditions are happening now or soon. You must take precautions to protect yourself and others from extreme heat.
- Stay inside in air conditioning if possible. If you don’t have air conditioning, go to a library, mall, or local cooling center.
- Drink plenty of water to stay hydrated, and wear loose, light-colored clothing.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
- Reschedule outdoor activities for a cooler day.
- If you must be outdoors, take longer and more frequent breaks in the shade or air conditioning, and avoid the hottest parts of the day.
- Bring pets indoors if possible. If pets are left outside, make sure they have shade and plenty of cool water.
- Make sure you know the signs of heat-related illness and how to respond.
In effect from Sunday 07/26 11:59 AM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS Phoenix AZ
What
Dangerously hot conditions. Afternoon temperatures 104 to 116. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.
Where
Mostly rural portions of southwest Arizona and southeast California, including Joshua Tree National Park.
When
Until 8 PM MST /8 PM PDT/ Monday.
Impacts
Heat related illnesses increase significantly during extreme heat events.
What to Do
An Extreme Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat.
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 and drink plenty of water.
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.
Public cooling shelters are available in some areas. Consult county officials for more details.
Areas Impacted
- Kofa
- Central La Paz
- Southeast Yuma County
- Gila River Valley
- Joshua Tree NP West
- Joshua Tree NP East
- Imperial County Southwest
- Salton Sea
- Chuckwalla Mountains
- Imperial County Southeast
- Imperial County West
- Chiriaco Summit
Tips to Stay Safe
An Extreme Heat Warning means that extremely dangerous heat conditions are happening now or soon. You must take precautions to protect yourself and others from extreme heat.
- Stay inside in air conditioning if possible. If you don’t have air conditioning, go to a library, mall, or local cooling center.
- Drink plenty of water to stay hydrated, and wear loose, light-colored clothing.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
- Reschedule outdoor activities for a cooler day.
- If you must be outdoors, take longer and more frequent breaks in the shade or air conditioning, and avoid the hottest parts of the day.
- Bring pets indoors if possible. If pets are left outside, make sure they have shade and plenty of cool water.
- Make sure you know the signs of heat-related illness and how to respond.
In effect from Sunday 07/26 3:42 PM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS Las Vegas NV
What
Dangerously hot conditions expected. Afternoon temperatures in the desert valleys will climb into the 108 to 114 degree range, and may exceed 115 along the Colorado River Valley and 120 in Death Valley. Overnight lows generally 80 to 95 degrees.
Where
Portions of northwest Arizona, southeast California, and southern Nevada including the Greater Mojave Desert region.
When
Until 8 PM PDT /8 PM MST/ Monday.
Impacts
Heat related illnesses increase significantly during extreme heat events.
What to Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
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.
Monitor the latest forecasts and warnings for updates.
Areas Impacted
- Lake Havasu and Fort Mohave
- Lake Mead - AZ side
- Lake Mohave - AZ side
- Northwest Deserts
- Death Valley National Park
- Western Mojave Desert
- Eastern Mojave Desert, Including the Mojave National Preserve
- Morongo Basin
- Cadiz Basin
- San Bernardino County-Upper Colorado River Valley
- Northeast Clark County
- Western Clark and Southern Nye County
- Las Vegas Valley
- Southern Clark County
- Lake Mead - NV side
- Lake Mohave - NV side
Tips to Stay Safe
An Extreme Heat Warning means that extremely dangerous heat conditions are happening now or soon. You must take precautions to protect yourself and others from extreme heat.
- Stay inside in air conditioning if possible. If you don’t have air conditioning, go to a library, mall, or local cooling center.
- Drink plenty of water to stay hydrated, and wear loose, light-colored clothing.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
- Reschedule outdoor activities for a cooler day.
- If you must be outdoors, take longer and more frequent breaks in the shade or air conditioning, and avoid the hottest parts of the day.
- Bring pets indoors if possible. If pets are left outside, make sure they have shade and plenty of cool water.
- Make sure you know the signs of heat-related illness and how to respond.
In effect from Wednesday 07/22 10:00 AM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS San Diego CA
The Heat Advisory has been replaced. Please see the latest information from NWS San Diego CA on this developing situation.
What to Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Areas Impacted
- San Bernardino and Riverside County Valleys-The Inland Empire
Tips to Stay Safe
A Heat Advisory means dangerous heat conditions are happening now or soon. Take action before, during and after the heat to stay safe.
- Stay in air-conditioned spaces if possible. Find cooling centers or places with AC in your community that you can go to, like libraries or shopping malls.
- Stay hydrated and stock up on clean drinking water to get you through multiple days of heat.
- Reschedule outdoor activities for cooler times of the day, and take breaks in the shade or air conditioning.
- Cover windows with curtains or shades, or use window reflectors designed to reflect heat back outside.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
Make sure you know the signs of heat-related illness and how to respond.
In effect from Sunday 07/26 11:14 AM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS San Diego CA
What
Dangerously hot conditions with high temperatures in the mid 90s to 103 and low temperatures in the mid 60s to low 70s.
Where
San Bernardino and Riverside County Valleys-The Inland Empire.
When
Until 8 PM PDT Monday.
Impacts
Hot temperatures may cause heat illnesses.
What to Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Areas Impacted
- San Bernardino and Riverside County Valleys-The Inland Empire
Tips to Stay Safe
A Heat Advisory means dangerous heat conditions are happening now or soon. Take action before, during and after the heat to stay safe.
- Stay in air-conditioned spaces if possible. Find cooling centers or places with AC in your community that you can go to, like libraries or shopping malls.
- Stay hydrated and stock up on clean drinking water to get you through multiple days of heat.
- Reschedule outdoor activities for cooler times of the day, and take breaks in the shade or air conditioning.
- Cover windows with curtains or shades, or use window reflectors designed to reflect heat back outside.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
Make sure you know the signs of heat-related illness and how to respond.
In effect from Sunday 07/26 11:14 AM PDT – Monday 07/27 8:00 PM PDT
Issued by NWS San Diego CA
What
High temperatures in the mid 80s to upper 90s and lows in the mid 60s to mid 70s below 6500 ft.
Where
Riverside County Mountains and San Bernardino County Mountains.
When
Until 8 PM PDT Monday.
Impacts
Hot temperatures may cause heat illnesses.
What to Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Areas Impacted
- San Bernardino County Mountains
- Riverside County Mountains
Tips to Stay Safe
A Heat Advisory means dangerous heat conditions are happening now or soon. Take action before, during and after the heat to stay safe.
- Stay in air-conditioned spaces if possible. Find cooling centers or places with AC in your community that you can go to, like libraries or shopping malls.
- Stay hydrated and stock up on clean drinking water to get you through multiple days of heat.
- Reschedule outdoor activities for cooler times of the day, and take breaks in the shade or air conditioning.
- Cover windows with curtains or shades, or use window reflectors designed to reflect heat back outside.
- Check on friends, family, and neighbors, especially those who do not have air conditioning or spend much of their time alone.
Make sure you know the signs of heat-related illness and how to respond.
Briefings
From the Forecaster
Dangerous Heat
Created by the NWS Las Vegas WFO
Temperatures increase over the coming days, resulting in dangerous heat across the Mojave Desert Thursday through Monday. Anomalously warm overnight lows will greatly limit overnight relief while high temperatures run around 5 degrees above normal.
Extreme Heat Warning
Created by the NWS Phoenix WFO
Temperatures will cool a couple degrees during the beginning of the week before leveling off during the middle of the week. Lower desert high temperatures will reach 106-115 degrees, while lows will be in the upper 80s to middle 90s. With temperatures cooling HeatRisk will decrease to widespread Moderate with some areas of Major. An Extreme Heat Warning is in effect for all of the lower deserts through Monday evening. The Extreme Heat Warning was extended for the Phoenix Metro, Lower CO River Valley, and Imperial Valley through Wednesday.
Seven-day Weather Risk Overview
The graphic shows the daily risk summary for 7 days. Daily risk is based on highest risk factor for that day.
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