URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
509 AM PDT Thu Mar 19 2026
CAZ006-502>506-508>510-512>518-528>530-192200-
/O.CON.KMTR.HT.Y.0001.000000T0000Z-260321T0300Z/
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-
509 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the low to mid 90s across the interior
and 80s along the coastline.
* WHERE...The Bay Area and Central Coast.
* WHEN...Until 8 PM PDT Friday.
* 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.
* ADDITIONAL DETAILS...Much above normal temperatures in the upper
80s to mid 90s are expected through the remainder of the week
across the Bay Area and Central Coast. Portions of the interior
Central Coast may reach the upper 90s starting mid to late week.
Overnight lows in the upper 50s to low 60s will offer some relief
to the lower elevations but will offer minimal relief within the
higher elevations. Conditions will be much above normal along the
coast this week but coastal residents may experience more relief
overnight than those across the interior. The risk of heat related
illnesses will increase with each additional day of heating from
this event.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
Flynn
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ048-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Rancho Cucamonga, San Bernardino,
Riverside, Corona, Ontario, Moreno Valley, and Fontana
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the upper 90s to 104 degrees expected.
* WHERE...San Bernardino and Riverside County Valleys-The Inland
Empire.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Overnight low temperatures in foothill
locations will only fall into the lower to mid 70s limiting relief
from the heat.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ050-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
San Diego County Valleys-
Including the cities of Escondido, La Mesa, San Marcos, El Cajon,
Poway, and Santee
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the upper 90s to 104 expected.
* WHERE...San Diego County Valleys.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
* ADDITIONAL DETAILS...Overnight low temperatures in foothill
locations will only fall into the lower 70s limiting relief from
the heat.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ055-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
San Bernardino County Mountains-
Including the cities of Wrightwood, Crestline, Running Springs,
and Lake Arrowhead
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the 80s to mid 90s below 6500 feet
expected.
* WHERE...San Bernardino County Mountains.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ056-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
Riverside County Mountains-
Including the cities of Idyllwild-Pine Cove
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the 80s to mid 90s below 6500 feet
expected.
* WHERE...Riverside County Mountains.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ043-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
San Diego County Coastal Areas-
Including the cities of National City, Chula Vista, San Diego,
Vista, Encinitas, Carlsbad, and Oceanside
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the upper 80s to mid 90s away from the
beaches.
* WHERE...San Diego County Coastal Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ057-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
Santa Ana Mountains and Foothills-
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the 90s expected.
* WHERE...Santa Ana Mountains and Foothills.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ554-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
Orange County Inland Areas-
Including the cities of Fullerton, Anaheim, Irvine, Santa Ana,
Mission Viejo, Orange, and Garden Grove
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the 90s expected.
* WHERE...Orange County Inland Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
17
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ552-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
Orange County Coastal Areas-
Including the cities of Huntington Beach and Costa Mesa
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the 80s and lower 90s.
* WHERE...Orange County Coastal Areas.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
151 AM PDT Thu Mar 19 2026
CAZ058-192300-
/O.CON.KSGX.HT.Y.0002.000000T0000Z-260321T0300Z/
San Diego County Mountains-
Including the cities of Julian and Pine Valley
151 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...High temperatures in the mid 80s above 5000 feet to 90s
below 4500 feet expected.
* WHERE...San Diego County Mountains.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
1203 AM PDT Thu Mar 19 2026
CAZ520-NVZ014-015-192200-
/O.CON.KVEF.HT.Y.0001.000000T0000Z-260322T0300Z/
Owens Valley-Esmeralda and Central Nye County-Lincoln County-
Including the cities of Beatty, Lone Pine, Alamo, Independence,
Goldfield, Olancha, Silver Peak, Hiko, Pioche, Caliente, Rachel,
Dyer, Bishop, and Panaca
1203 AM PDT Thu Mar 19 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT SATURDAY...
* WHAT...Hot temperatures climbing to near-30 degrees above seasonal
normals.
* WHERE...In California, Owens Valley. In Nevada, Esmeralda and
Central Nye County and Lincoln County.
* WHEN...Until 8 PM PDT Saturday.
* IMPACTS...Heat-related illnesses increase significantly during
extreme heat events.
* ADDITIONAL DETAILS...Extreme early-season heat coupled with high
tourism rates will make this heat very dangerous, particularly for
those not acclimated to the heat and/or traveling from cooler
climates. Numerous daily and monthly heat records are in jeopardy
through at least Sunday.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
For more information from the National Weather Service visit
http://weather.gov/lasvegas
MW
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
106 PM PDT Wed Mar 18 2026
CAZ549-550-210300-
/O.CON.KLOX.HT.Y.0004.000000T0000Z-260321T0300Z/
San Miguel and Santa Rosa Islands-Santa Cruz and Anacapa Islands-
Including the cities of Smugglers Cove and Cuyler Harbor
106 PM PDT Wed Mar 18 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...Hot conditions with high temperatures between 80 and 90
expected.
* WHERE...San Miguel and Santa Rosa Islands and Santa Cruz and
Anacapa Islands.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...There is a high risk for heat illness for sensitive
populations including the very young, the very old, those without
air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Warm overnight low temperatures will
contribute to the heat risk, especially in the mountain and
foothill locations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
Visit us at http://www.weather.gov/LosAngeles
MW
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
106 PM PDT Wed Mar 18 2026
CAZ340-341-346>350-210300-
/O.CON.KLOX.HT.Y.0003.000000T0000Z-260321T0300Z/
San Luis Obispo County Beaches-San Luis Obispo County Inland
Central Coast-Santa Barbara County Central Coast Beaches-Santa
Barbara County Inland Central Coast-Santa Ynez Valley-Santa
Barbara County Southwestern Coast-Santa Barbara County
Southeastern Coast-
Including the cities of Buellton, Goleta, Montecito, Avila Beach,
Vandenberg Space Force Base, Carpinteria, Los Olivos, Lopez Lake,
Santa Barbara, Cambria, Jalama Beach, Santa Ynez, Gaviota,
Refugio State Beach, El Capitan State Beach, Arroyo Grande, Pismo
Beach, San Luis Obispo, Lake Cachuma, Morro Bay, Solvang, Nipomo,
Santa Maria, and Lompoc
106 PM PDT Wed Mar 18 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...Hot conditions with high temperatures in the 80s and 90s
expected.
* WHERE...San Luis Obispo County Beaches, San Luis Obispo County
Inland Central Coast, Santa Barbara County Central Coast Beaches,
Santa Barbara County Inland Central Coast, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast, and
Santa Ynez Valley.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...There is a high risk for heat illness for sensitive
populations including the very young, the very old, those without
air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Warm overnight low temperatures will
contribute to the heat risk, especially in the mountain and
foothill locations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
106 PM PDT Wed Mar 18 2026
CAZ354-355-362-366-367-210300-
/O.CON.KLOX.HT.Y.0003.000000T0000Z-260321T0300Z/
Ventura County Beaches-Ventura County Inland Coast-Malibu Coast-
Los Angeles County Beaches-Palos Verdes Hills-
Including the cities of LAX, Malibu, Point Mugu, Santa Monica,
Pacific Palisades, Torrance, Rancho Palos Verdes, Ventura, Long
Beach, Port Hueneme, Redondo Beach, Oxnard, Camarillo, and East
Ventura
106 PM PDT Wed Mar 18 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...Hot conditions with high temperatures in the 80s and 90s
expected.
* WHERE...Los Angeles County Beaches, Malibu Coast, Palos Verdes
Hills, Ventura County Beaches, and Ventura County Inland Coast.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...There is a high risk for heat illness for sensitive
populations including the very young, the very old, those without
air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Warm overnight low temperatures will
contribute to the heat risk, especially in the mountain and
foothill locations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
106 PM PDT Wed Mar 18 2026
CAZ038-343-344-210300-
/O.CON.KLOX.HT.Y.0004.000000T0000Z-260321T0300Z/
Cuyama Valley-Southern Salinas Valley-San Luis Obispo County
Interior Valleys-
Including the cities of Templeton, Paso Robles, San Miguel,
Atascadero, Shandon, Creston, New Cuyama, Carrizo Plain, and Lake
Nacimiento
106 PM PDT Wed Mar 18 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...Hot conditions with high temperatures in the 80s and 90s
expected.
* WHERE...Cuyama Valley, San Luis Obispo County Interior Valleys,
and Southern Salinas Valley.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...There is a high risk for heat illness for sensitive
populations including the very young, the very old, those without
air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Warm overnight low temperatures will
contribute to the heat risk, especially in the mountain and
foothill locations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
106 PM PDT Wed Mar 18 2026
CAZ087-210300-
/O.CON.KLOX.HT.Y.0003.000000T0000Z-260321T0300Z/
Catalina and Santa Barbara Islands-
Including the cities of Avalon
106 PM PDT Wed Mar 18 2026
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY...
* WHAT...Hot conditions with high temperatures between 80 and 90
expected.
* WHERE...Catalina and Santa Barbara Islands.
* WHEN...Until 8 PM PDT Friday.
* IMPACTS...There is a high risk for heat illness for sensitive
populations including the very young, the very old, those without
air conditioning, and those active outdoors.
* ADDITIONAL DETAILS...Warm overnight low temperatures will
contribute to the heat risk, especially in the mountain and
foothill locations.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$ |
