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Weather Alerts for Santa Clara Valley

Issued by the National Weather Service

Red Flag Warning  RED FLAG WARNING   Red Flag Warning
SANTA CLARA VALLEY

Areas Affected:
East Bay Hills and the Diablo Range - North Bay Mountains
Effective: Wed, 11/20 4:54am Updated: Wed, 11/20 12:45pm Urgency: Expected
Expires: Thu, 11/21 7:00am Severity:  Severe  Certainty: Likely

 
Details:
...RED FLAG WARNING FOR THE NORTH BAY MOUNTAINS AND EAST BAY
HILLS THROUGH THURSDAY MORNING...
.Offshore winds will continue over the higher elevations of the
North Bay and East Bay early this morning through Wednesday
night. These offshore winds in combination with low relative
humidity values will lead to critical fire weather conditions.
Additionally, poor overnight relative humidity recoveries are
expected Wednesday night and into Thursday morning as a result of
the continued offshore winds.
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 AM PST THURSDAY FOR
DRY OFFSHORE WINDS FOR FIRE WEATHER ZONES 507 AND 511...
* AFFECTED AREA...North Bay Mountains above 1000 feet, East Bay
Hills above 1000 ft, and the Diablo Range. Fire weather zones
507 and 511.
* WIND...North to northeast winds 20 to 30 mph with gusts 35 to
45 mph. Local gusts at isolated peaks and ridgetops may
approach and possibly exceed 60 mph.
* HUMIDITY...Wednesday afternoon relative humidity values
dropping to 15 to 30 percent. Poor recoveries are forecast on
Wednesday night with relative humidity values in the 30 to 45
percent range with localized values down to 25 percent.
* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Information:
A Red Flag Warning means that critical fire weather conditions
are either occurring now...or will shortly. A combination of
strong winds...low relative humidity...dry fuels...and warm
temperatures can contribute to extreme fire behavior.

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