440
WWUS76 KMTR 211325
NPWMTR

URGENT - WEATHER MESSAGE
National Weather Service San Francisco CA
625 AM PDT Thu Aug 21 2025

CAZ504-510-513>515-220500-
/O.EXT.KMTR.HT.Y.0004.250821T1700Z-250824T0400Z/
North Bay Interior Mountains-East Bay Interior Valleys-Santa
Clara Valley Including San Jose-Eastern Santa Clara Hills-East
Bay Hills-
625 AM PDT Thu Aug 21 2025

...HEAT ADVISORY NOW IN EFFECT FROM 10 AM THIS MORNING TO 9 PM PDT
SATURDAY...

* WHAT...Daytime temperatures in the 90s to low 100s expected.
  Nighttime temperatures in the low 60s in the Santa Clara Valley
  and upper 60s to mid 70s at higher elevations.

* WHERE...The Santa Clara Valley and Eastern Hills, The East Bay
  Hills and Valleys, and North Bay Interior Mountains.

* WHEN...From 10 AM this morning to 9 PM PDT Saturday.

* IMPACTS...Hot conditions can cause heat illnesses. 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Hydration is a critical piece to surviving the heat. Drink water,
and if possible, take water to those who are vulnerable.

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.

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.

&&

$$

CAZ506-508-220500-
/O.CON.KMTR.HT.Y.0004.250821T1700Z-250822T0500Z/
North Bay Interior Valleys-San Francisco Bay Shoreline-
625 AM PDT Thu Aug 21 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 PM
PDT THIS EVENING...

* WHAT...Temperatures in the 80s to the middle 90s expected near the
  Bay and 90s to near 100 degrees interior North Bay.

* WHERE...North Bay Interior Valleys and San Francisco Bay Shoreline.

* WHEN...From 10 AM this morning to 10 PM PDT this evening.

* IMPACTS...Hot conditions can cause heat illnesses. 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Hydration is a critical piece to surviving the heat. Drink water,
and if possible, take water to those who are vulnerable.

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.

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.

&&

$$

CAZ512-220500-
/O.CON.KMTR.HT.Y.0004.250821T1700Z-250823T0500Z/
Santa Cruz Mountains-
625 AM PDT Thu Aug 21 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 PM
PDT FRIDAY...

* WHAT...Daytime temperatures in the 90s with nighttime temperatures
  ranging from upper 50s in San Mateo County to mid 70s along the
  ridge.

* WHERE...The Santa Cruz Mountains.

* WHEN...From 10 AM this morning to 10 PM PDT Friday.

* IMPACTS...Hot conditions can cause heat illnesses. 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Hydration is a critical piece to surviving the heat. Drink water,
and if possible, take water to those who are vulnerable.

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.

Stay cool, stay hydrated, stay informed.

&&

$$

CAZ516>518-220500-
/O.CON.KMTR.HT.Y.0004.250821T1700Z-250824T0400Z/
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-
625 AM PDT Thu Aug 21 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 9 PM
PDT SATURDAY...

* WHAT...Daytime temperatures from the 90s to near 107 expected.
  Nighttime temperatures in the hills 60s to mid 70s.

* WHERE...Interior Monterey County and the Santa Lucia Range,
  Interior San Benito County, and Southern Salinas Valley/Arroyo
  Seco and Lake San Antonio.

* WHEN...From 10 AM this morning to 9 PM PDT Saturday.

* IMPACTS...Hot conditions can cause heat illnesses. 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.

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.

&&

$$

Flynn