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Updated:June 10, 2026 11:15 pm PDT

Red Flag Warning RED FLAG WARNING  
Santa Clara County

  Effective: Wed, 6/10 10:33pm Severity:  Severe 
  Updated: June 10, 2026 11:15 pm Urgency: Expected
  Expires: Thu, 6/11 9:00am Certainty: Likely

Areas Affected: North Bay Interior Mountains - East Bay Hills
 
Alert Details:
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 AM PDT THURSDAY DUE TO
WIND AND LOW RELATIVE HUMIDITY RECOVERY FOR NORTH BAY INTERIOR
MOUNTAINS AND EAST BAY HILLS...

....Dry and windy conditions combined with some dry vegetation will
lead to a critical fire weather threat through Thursday morning...

* AFFECTED AREA...East Bay Hills and North Bay Interior Mountains.

* TIMING...Until 9 AM PDT Thursday.

* WINDS 20 FOOT...Northerly winds 10 to 20 mph with gusts up to 45
mph.

* RELATIVE HUMIDITY RECOVERY...Thursday morning relative humidity of
less than 40 percent.

* IMPACTS...Extreme fire behavior and rapid rates of spread likely on
new and existing wildfires. There will be an increased risk for
power outages.

Information:
Please advise responding agencies or fire crews in the field of this
fire weather alert.

Never leave burning debris or camp fires unattended; extinguish them
completely. Avoid using equipment or machinery that could create a
spark. Secure tow chains to avoid dragging and subsequent sparks.
Never toss cigarette butts out of your vehicle's window. Remember,
one less spark, one less flame.

Familiarize yourself with your emergency plan! Where will you go? How
will you get there? Do you have your go kit ready to go? Who will you
call to let others know you are safe? Visit ready.gov/plan for more
information.
Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Santa Clara County

  Effective: Wed, 6/10 9:43pm Severity: Minor
  Updated: June 10, 2026 11:15 pm Urgency: Expected
  Expires: Thu, 6/11 5:45am Certainty: Likely

Areas Affected: San Francisco - San Francisco Bay Shoreline
 
Alert Details:
* WHAT...Up to 1.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.

* WHERE...Bayshore regions near the San Francisco Bay.

* WHEN...From 7 PM Thursday to 3 AM PDT Wednesday.

* 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 1.2 ft above normal (6.98 ft MLLW) at 8:51 PM
on Thursday the 11th, 1.5 ft above normal (7.33 ft MLLW) at 9:34
PM on Friday the 12th, 1.8 ft above normal (7.58 ft MLLW) at
10:20 PM on Saturday the 13th, 1.3 ft above normal (7.10 ft
MLLW) at 11:10 PM on Sunday the 14th, 1.2 ft above normal (7.05
ft MLLW) at 12:02 AM on Tuesday the 16th, and 1.0 ft above
normal (6.81 ft MLLW) at 12:56 AM on Wednesday the 17th. High
tide varies up to 90 minutes earlier or later along the Pacific
Coast and through the San Francisco Bay, respectively.

Information:
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.
Heat Advisory HEAT ADVISORY  
Santa Clara County

  Effective: Wed, 6/10 9:16pm Severity:  Moderate 
  Updated: June 10, 2026 11:15 pm Urgency: Expected
  Expires: Thu, 6/11 3:00pm Certainty: Likely

Areas Affected: East Bay Interior Valleys - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills
 
Alert Details:
* WHAT...Temperatures between 90 and 95 for most areas, with some
readings above 100 degrees. Hottest conditions across the East Bay
Hills and Valleys.

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

* WHEN...From noon Thursday to 7 PM PDT Friday.

* IMPACTS...This level of heat affects primarily those individuals
extremely sensitive to heat, especially when outdoors without
effective cooling and/or adequate hydration. 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.

Information:
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.
Heat Advisory HEAT ADVISORY  
Santa Clara County

  Effective: Wed, 6/10 9:16pm Severity:  Moderate 
  Updated: June 10, 2026 11:15 pm Urgency: Expected
  Expires: Thu, 6/11 3:00pm Certainty: Likely

Areas Affected: Sonoma Coastal Range - North Bay Interior Mountains - North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* WHAT...High temperatures between 90 and 103 for interior valleys
and higher elevations. High temperatures between 85 and 96 degrees
for the Bay Shoreline.

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

* WHEN...From noon to 11 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.

Information:
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.