California Weather & Safety Alerts
11 active alerts
Data source: National Weather Service (NWS)
Extreme Heat
Heat Advisory (ADVISORY) - expires September 9, 2026 at 11:15 PM EDT
Areas affected: West Side Mountains north of 198; Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; West Side Mountains South of 198; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Buena Vista; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley; Mariposa Madera Foothills; Fresno-Tulare Foothills; South End Sierra Foothills
Heat Advisory issued September 9 at 11:31AM PDT until September 10 at 10:00PM PDT by NWS Hanford CA
- WHAT...High temperatures up to 102 and morning lows up to 75 expected. Widespread Moderate HeatRisk will be present with areas of Major HeatRisk in the foothills where the thermal belt is strongest and in urban areas.
WHERE...The San Joaquin Valley, Sierra Nevada Foothills, and West Side Hills along the Coastal Range.
WHEN...Until 10 PM PDT Thursday.
IMPACTS...Hot temperatures may cause heat illnesses, especially those without effective cooling and/or adequate hydration.
ADDITIONAL DETAILS...Little to no relief at night in areas of Major HeatRisk. Air conditioning is necessary; fans and open windows at night will not be enough.
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.
Source: NWS Hanford CA
Heat Advisory (ADVISORY) - expires September 10, 2026 at 8:00 PM EDT
Areas affected: Sierra Nevada of Tehama-Butte-Plumas Counties Between 1000-3000 ft; Northern Motherlode Between 1000-3000 ft; Central Motherlode Between 1000-3000 ft; Southern Motherlode Between 1000-3000 ft; Northern Sacramento Valley in Tehama County; Central Glenn County Including Interstate 5; Eastern Glenn County; Butte County Below 1000 ft; Central Colusa County Including Interstate 5; Eastern Colusa County; Sutter and Yuba Counties Below 1000 ft; Capay Hills of Yolo County and Vaca Hills of Solano County; Western Yolo County Including Capay Valley and Interstate 505; Central Yolo and Northeast Solano Counties Including Woodland and Davis; Sacramento Metro and Western El Dorado and Amador Counties; Central Solano County Including Fairfield and Vacaville; Southwestern Solano County Including Vallejo; Sacramento County Delta; San Joaquin County Delta; Central San Joaquin County Including Stockton Metro; Tracy Triangle Below 1000 ft; Northeastern San Joaquin Valley Below 1000 ft; Eastern Diablo Range Above 1000 ft; Western Stanislaus County Below 1000 ft Including Interstate 5; Central Stanislaus County Including Modesto Metro
Heat Advisory issued September 9 at 10:37AM PDT until September 10 at 10:00PM PDT by NWS Sacramento CA
- WHAT...High temperatures 97 to 103 and low temperatures 65 to 75 expected, with widespread Moderate HeatRisk and areas of Major HeatRisk.
WHERE...The central and southern Sacramento Valley, northern San Joaquin Valley, Delta and Carquinez Strait, foothills, and portions of the Coast Range.
WHEN...Until 10 PM PDT Thursday.
IMPACTS...Hot temperatures may cause heat illnesses, especially to anyone without effective cooling and/or adequate hydration.
ADDITIONAL DETAILS...Hottest temperatures and areas of Major HeatRisk are expected today. Warmest overnight lows are expected in the Sierra foothills thermal belts.
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.
Source: NWS Sacramento CA
Heat Advisory (ADVISORY) - expires September 11, 2026 at 1:00 AM EDT
Areas affected: San Francisco; Marin Coastal Range; Sonoma Coastal Range; North Bay Interior Mountains; Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys; San Francisco Bay Shoreline; San Francisco Peninsula Coast; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
Heat Advisory issued September 9 at 3:14AM PDT until September 10 at 10:00PM PDT by NWS San Francisco CA
- WHAT...Hot conditions with temperatures 10 to 20 degrees above normal during the day, with overnight lows also running 10 to 20 degrees above normal.
WHERE...Bay Area and Central Coast.
WHEN...Until 10 PM PDT Thursday.
IMPACTS...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries. Hot conditions can cause heat illnesses.
What to do: Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable.
Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke.
Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
Source: NWS San Francisco CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: Santa Ana Mountains and Foothills
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the 90s to near 100 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the mid 80s to mid 90s expected.
WHERE...Santa Ana Mountains and Foothills.
WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday.
IMPACTS...Heat related illnesses increase significantly during extreme heat events.
ADDITIONAL DETAILS...Areas of Major HeatRisk. Very warm overnight temperatures will limit 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.
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.
Source: NWS San Diego CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: Riverside County Mountains; San Diego County Mountains
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...High temperatures in the 90s below 5500 feet expected.
WHERE...Riverside County Mountains and San Diego County Mountains below 5500 feet.
WHEN...Until 8 PM PDT Thursday.
IMPACTS...Hot temperatures may cause heat illnesses.
ADDITIONAL DETAILS...Moderate HeatRisk. Warm overnight temperatures will limit 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.
Source: NWS San Diego CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: San Diego County Coastal Areas; Orange County Coastal
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 80s to lower 90s at the beaches to around 100 higher coastal terrain with low temperatures in the lower to mid 70s. For the Heat Advisory, high temperatures in the 80s and lower 90s.
WHERE...Orange County Coastal Areas and San Diego County Coastal Areas.
WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday.
IMPACTS...Heat related illnesses increase significantly during extreme heat events.
ADDITIONAL DETAILS...Major to Extreme HeatRisk through today. Warm overnight low temperature will limit 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.
Source: NWS San Diego CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures of 104 to 110 with low temperatures in the 70s and lower 80s expected. For the Heat Advisory, high temperatures in the upper 90s to 105 expected.
WHERE...San Bernardino and Riverside County Valleys-The Inland Empire.
WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday.
IMPACTS...Heat related illnesses increase significantly during extreme heat events.
ADDITIONAL DETAILS...Major HeatRisk through today. Warm overnight temperatures will limit 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.
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
Source: NWS San Diego CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: Orange County Inland
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures of 100 to 106 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the 90s expected.
WHERE...Orange County Inland Areas.
WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday.
IMPACTS...Heat related illnesses increase significantly during extreme heat events.
ADDITIONAL DETAILS...Major HeatRisk. Warm overnight temperatures will limit 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.
Source: NWS San Diego CA
Heat Advisory (ADVISORY) - expires September 9, 2026 at 6:30 PM EDT
Areas affected: San Diego County Inland Valleys
Heat Advisory issued September 9 at 2:58AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures in the mid 90s to 107 with low temperatures in the 70s expected. For the Heat Advisory, high temperatures in the mid 90s to 104 expected.
WHERE...San Diego County Valleys.
WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday.
IMPACTS...Heat related illnesses increase significantly during extreme heat events.
ADDITIONAL DETAILS...Major to Extreme HeatRisk. Warm overnight temperatures will limit 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.
Source: NWS San Diego CA
Flooding
Coastal Flood Advisory (ADVISORY) - expires September 9, 2026 at 6:00 PM EDT
Areas affected: San Diego County Coastal Areas; Orange County Coastal
Coastal Flood Advisory issued September 9 at 1:30AM PDT until September 9 at 11:00PM PDT by NWS San Diego CA
- WHAT...Minor coastal flooding from high tides this evening.
WHERE...Beaches of Orange and San Diego Counties.
WHEN...Until 11 PM PDT.
IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Most likely during Wednesday evening's high tide.
ADDITIONAL DETAILS...High tides this evening at Newport Beach: 6.3 feet at 845 PM. At La Jolla: 6.3 feet at 839 PM. Measured high tides are exceeding predicted levels by 6-7 inches.
What to do: High tides could generate flooding of low areas along the shore.
Source: NWS San Diego CA
Coastal Flood Advisory (ADVISORY) - expires September 10, 2026 at 4:00 AM EDT
Areas affected: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
Coastal Flood Advisory issued September 9 at 1:01AM PDT until September 10 at 1:00AM PDT by NWS San Francisco CA
- WHAT...Up to 1\.0 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways.
WHERE...Bayshore locations along the San Francisco Bay, San Pablo Bay, and Monterey Bay.
WHEN...In effect now through 1 AM PDT Thursday.
IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected.
ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.0 ft above normal (6.79 ft MLLW) at 10:54 PM Wednesday 9/9. These predictions include up to 0.6 ft of storm surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
What to do: If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Source: NWS San Francisco CA
Source
Alert data provided by the National Weather Service (NWS). This page shows active alerts only and is refreshed daily. For real-time updates, visit weather.gov.