Los Angeles 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 Thursday 07/30 11:07 PM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
Dangerously hot conditions with temperatures of 105 to 115 expected.
Where
Antelope Valley, Eastern Antelope Valley Foothills, and Western Antelope Valley Foothills.
When
Until 8 PM PDT Sunday.
Impacts
Heat related illnesses increase significantly during extreme heat events.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
Stay cool, stay hydrated, stay informed.
Monitor the latest forecasts and warnings for updates.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- Western Antelope Valley Foothills
- Eastern Antelope Valley Foothills
- Antelope Valley
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 Friday 07/31 10:00 AM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
For the Heat Advisory, hot temperatures of 90 to 100 expected. For the Extreme Heat Warning, dangerously hot conditions with temperatures of 95 to 105 expected.
Where
Interstate 5 Corridor and Western San Gabriel Mountains and Highway 14 Corridor.
When
For the Heat Advisory, until 10 AM PDT Friday. For the Extreme Heat Warning, from 10 AM Friday to 8 PM PDT Sunday.
Impacts
Heat hazards may extend into next week for portions of the region.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
Stay cool, stay hydrated, stay informed.
Monitor the latest forecasts and warnings for updates.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- Interstate 5 Corridor
- Western San Gabriel Mountains and Highway 14 Corridor
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 Friday 07/31 10:00 AM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
Dangerously hot conditions with temperatures of 95 to 110 expected.
Where
A large portion of southwest California including the coastal ranges and adjacent foothills, as well as the coastal valleys.
When
From 10 AM Friday to 8 PM PDT Sunday.
Impacts
Heat related illnesses increase significantly during extreme heat events.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
Stay cool, stay hydrated, stay informed.
Monitor the latest forecasts and warnings for updates.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- Cuyama Valley
- Santa Clarita Valley
- Southern Salinas Valley
- San Luis Obispo County Interior Valleys
- San Luis Obispo County Mountains
- Santa Ynez Mountains Western Range
- Santa Ynez Mountains Eastern Range
- Santa Barbara County Interior Mountains
- Ventura County Inland Coast
- Lake Casitas
- Ojai Valley
- Central Ventura County Valleys
- Los Angeles County Inland Coast including Downtown Los Angeles
- Western Santa Monica Mountains Recreational Area
- Eastern Santa Monica Mountains Recreational Area
- Calabasas and Agoura Hills
- Western San Fernando Valley
- Eastern San Fernando Valley
- Southeastern Ventura County Valleys
- Santa Susana Mountains
- Southern Ventura County Mountains
- Los Angeles County San Gabriel Valley
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 Thursday 07/30 11:07 PM PDT – Friday 07/31 10:00 AM PDT
Issued by NWS Los Angeles/Oxnard CA
What
For the Heat Advisory, hot temperatures of 90 to 100 expected. For the Extreme Heat Warning, dangerously hot conditions with temperatures of 95 to 105 expected.
Where
Interstate 5 Corridor and Western San Gabriel Mountains and Highway 14 Corridor.
When
For the Heat Advisory, until 10 AM PDT Friday. For the Extreme Heat Warning, from 10 AM Friday to 8 PM PDT Sunday.
Impacts
Heat hazards may extend into next week for portions of the region.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
Stay cool, stay hydrated, stay informed.
Monitor the latest forecasts and warnings for updates.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- Interstate 5 Corridor
- Western San Gabriel Mountains and Highway 14 Corridor
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 Thursday 07/30 11:07 PM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
Temperatures of 90 to 100 expected.
Where
A portion of southwest California near the coast including the beaches.
When
Until 8 PM PDT Sunday.
Impacts
Heat hazards may extend into next week for portions of the region.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
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.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- Eastern San Gabriel 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.
In effect from Friday 07/31 10:00 AM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
Temperatures of 85 to 100 expected.
Where
A portion of southwest California near the coast including the beaches.
When
From 10 AM Friday to 8 PM PDT Sunday.
Impacts
Heat hazards may extend into next week for portions of the region.
Additional Details
Heat hazards may extend into next week for portions of the region.
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.
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.
If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat.
Areas Impacted
- San Luis Obispo County Inland Central Coast
- Santa Lucia Mountains
- Santa Barbara County Inland Central Coast
- Santa Ynez Valley
- Santa Barbara County Southwestern Coast
- Santa Barbara County Southeastern Coast
- Ventura County Beaches
- Malibu Coast
- Los Angeles County Beaches
- Palos Verdes Hills
- Northern Ventura 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.
In effect from Thursday 07/30 2:14 PM PDT – Saturday 08/01 3:00 AM PDT
Issued by NWS Los Angeles/Oxnard CA
What
For the High Surf Advisory, large breaking waves of 4 to 8 feet with dangerous rip currents, highest across south to southwest facing beaches exposed to southerly swells. Very strong rip currents are occuring along some beaches, especially exposed south to southwest facing beaches. For the Coastal Flood Advisory, minor coastal flooding expected at the times of highest tide.
Where
Catalina and Santa Barbara Islands, Ventura County Beaches, Malibu Coast, and Los Angeles County Beaches.
When
For the Coastal Flood Advisory, until 3 AM PDT Saturday. For the High Surf Advisory, until 5 PM PDT Saturday.
Impacts
Flooding of sea water is likely around the time of high tide, over low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.
Additional Details
High tides of 6.2 to near 7.0 feet will occur in the evening hours through Friday night, peaking tonight through Thursday night. In conjunction with the highest expected surf from Tropical Cyclone Genevieve southerly swell, the best potential for minor coastal flooding impacts is expected Wednesday and Thursday evening.
What to Do
Take the necessary actions to protect flood-prone property. Do NOT drive around barricades or through water of unknown depth.
Remain out of the water due to dangerous surf conditions, or stay near occupied lifeguard towers. Rock jetties can be deadly in such conditions, stay off the rocks.
Areas Impacted
- Catalina and Santa Barbara Islands
- Ventura County Beaches
- Malibu Coast
- Los Angeles County Beaches
Tips to Stay Safe
A Flood Advisory is issued when flooding may cause significant inconvenience, or even become dangerous if you are not careful. Know your risk at home, work and school, and use caution when flooding is expected.
- Be aware of low-lying areas along your travel routes that are most likely to flood.
- Check road conditions before traveling, and obey road closures and barricades.
- Never walk, swim, or drive through flood waters.
- Stay tuned for local weather updates on the situation as it develops.
In effect from Thursday 07/30 2:14 PM PDT – Saturday 08/01 5:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
For the High Surf Advisory, large breaking waves of 4 to 8 feet with dangerous rip currents, highest across south to southwest facing beaches exposed to southerly swells. Very strong rip currents are occuring along some beaches, especially exposed south to southwest facing beaches. For the Coastal Flood Advisory, minor coastal flooding expected at the times of highest tide.
Where
Catalina and Santa Barbara Islands, Ventura County Beaches, Malibu Coast, and Los Angeles County Beaches.
When
For the Coastal Flood Advisory, until 3 AM PDT Saturday. For the High Surf Advisory, until 5 PM PDT Saturday.
Impacts
Flooding of sea water is likely around the time of high tide, over low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.
Additional Details
High tides of 6.2 to near 7.0 feet will occur in the evening hours through Friday night, peaking tonight through Thursday night. In conjunction with the highest expected surf from Tropical Cyclone Genevieve southerly swell, the best potential for minor coastal flooding impacts is expected Wednesday and Thursday evening.
What to Do
Take the necessary actions to protect flood-prone property. Do NOT drive around barricades or through water of unknown depth.
Remain out of the water due to dangerous surf conditions, or stay near occupied lifeguard towers. Rock jetties can be deadly in such conditions, stay off the rocks.
Areas Impacted
- Catalina and Santa Barbara Islands
- Ventura County Beaches
- Malibu Coast
- Los Angeles County Beaches
Tips to Stay Safe
A High Surf Advisory means that breaking waves could result in dangerous conditions.
- Very strong waves could be dangerous to anyone in the water and along the shore.
- Always stay near lifeguards.
- Stay off of rocks or jetties where large waves could pop up suddenly.
In effect from Thursday 07/30 4:02 PM PDT – Sunday 08/02 8:00 PM PDT
Issued by NWS Los Angeles/Oxnard CA
What
The South Coast AQMD has issued an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels.
Where
Glendora, San Fernando Valley, Santa Clarita Valley, San Gabriel Valley, San Bernardino, Redlands, Riverside, Crestline and the Coachella Valley.. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport.
When
until 8 PM Sunday. The highest ozone levels typically occur in the afternoon and early-evening hours.
Impacts
Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.
What to Do
To protect your health, check air quality levels and act as needed:
* When Air Quality Index (AQI) levels are "Unhealthy for Sensitive Groups" (orange), sensitive groups as specified above should limit extended or intense outdoor activity. * When AQI is "Unhealthy" (red), everyone may experience health impacts. Sensitive groups should avoid extended time outdoors. * When AQI is "Very Unhealthy" (purple), sensitive groups should avoid all outdoor physical activity. Everyone else should avoid extended or intense outdoor activity. * When AQI is "Hazardous" (maroon), everyone should avoid all outdoor physical activity.
* ADDITIONAL DETAILS...
To help keep indoor air clean when air quality is poor:
* Keep windows and doors closed * Run your air conditioner and/or an air purifier * Do not use whole house fans or swamp coolers that bring in outside air if you have other methods to stay cool * Avoid other sources of pollution such as fireplaces, candles, incense, and grilling
To help minimize outdoor ozone air pollution levels:
* Limit the use of gasoline powered lawn and garden equipment until evening hours * Try to delay trips to the gas station and the use of household chemicals until the evening
Areas Impacted
- Eastern San Fernando Valley
- Eastern San Gabriel Mountains
- Interstate 5 Corridor
- Los Angeles County San Gabriel Valley
- Santa Clarita Valley
- Western San Fernando Valley
- Western San Gabriel Mountains and Highway 14 Corridor
Tips to Stay Safe
When an Air Quality Alert is active for your location:
- Check the air quality levels in your area at airnow.gov.
- Limit your time outdoors, especially if you are at higher risk. This includes seniors, children, or those with asthma or other health conditions.
Briefings
From the Forecaster
Heat Peaking Friday - Sunday
Created by the NWS Los Angeles/Oxnard WFO
Hot conditions are underway today, with Heat Advisories for the San Gabriel Mountains and Heat Warnings for the Antelope Valley. Heat will peak Friday through Sunday, with widespread heat advisories and warnings throughout much of the area. Suggested Actions: Limit outdoor activities to just the early morning hours. Stay in air conditioned spaces during the afternoon and evening hours. Check in on loved ones. Never leave children or pets in unattended vehicles. Take frequent rest breaks and stay hydrated. Outdoor workers take rest breaks in the shade. Provide shade and water for outdoor animals.
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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