WEATHER »
  • Red Flag Warning for San Francisco County, California
  • Red Flag Warning issued December 17 at 2:18AM PST until December 17 at 10:00AM PST by NWS
  • Effective: Sunday, December 17, 2017 at 2:18 a.m.
  • Expires: Sunday, December 17, 2017 at 10 a.m.
  • ...Gusty northerly winds will continue to combine with low
    humidity values through Sunday morning...
    .High pressure rapidly building into the Great Basin this morning
    is resulting in a strong offshore pressure gradient and a
    combination of gusty winds and low humidity values. Due to these
    factors and the recent long stretch of warm and dry conditions, a
    very elevated fire weather risk exists particularly for higher
    elevation locations.
    ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
    MORNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY...
    * WIND...Northerly winds of 15 to 30 mph with local gusts over
    50 mph. Strongest gusts will be over the North Bay Mountains
    and East Bay Hills.
    * HUMIDITY...Overnight maximum humidity readings will likely be
    confined to the 20 to 30% range.
    * HIGHEST THREAT...Elevations above 1000 ft, especially in the
    North Bay Mountains and East Bay Hills.
    * IMPACTS...Any fires that develop will likely spread rapidly.
    Outdoor burning is not recommended.

  • Red Flag Warning for San Francisco County, California
  • Red Flag Warning issued August 06 at 9:06PM PDT until August 07 at 11:00AM PDT by NWS
  • Effective: Thursday, August 6, 2015 at 9:06 p.m.
  • Expires: Friday, August 7, 2015 at 11 a.m.
  • ...RED FLAG WARNING IN EFFECT THROUGH 11 AM FRIDAY FOR THE ENTIRE
    SAN FRANCISCO BAY AREA AND MONTEREY BAY AREA FOR DRY
    THUNDERSTORMS...
    .AN UPPER LEVEL LOW NEAR THE BIG SUR COAST HAS COMBINED WITH
    SUBTROPICAL MOISTURE TO PRODUCE SCATTERED THUNDERSTORMS ACROSS
    SANTA CRUZ AND WESTERN MONTEREY COUNTY ON THURSDAY EVENING. THESE
    STORMS ARE EXPECTED TO MOVE TO THE NORTH AND EAST OVERNIGHT AND
    POSSIBLY IMPACT MUCH OF THE SAN FRANCISCO BAY AREA. INDIVIDUAL
    THUNDERSTORMS ARE MOVING RAPIDLY TO THE NORTH-NORTHEAST AT ABOUT
    40 MPH WHICH MEANS PRECIPITATION ACCUMULATION IS PROBABLY LIGHT.
    THUS...THERE IS A HIGH LIKELIHOOD FOR DRY LIGHTNING AND THE
    POTENTIAL FOR FIRE STARTS. THUNDERSTORM ACTIVITY IS FORECAST TO
    MOSTLY END BY FRIDAY MORNING EXCEPT PERHAPS A FEW ISOLATED
    LINGERING THUNDERSTORMS OVER THE EASTERN PART OF THE DISTRICT
    THROUGH MID MORNING.
    ...RED FLAG WARNING FOR DRY THUNDERSTORMS REMAINS IN EFFECT UNTIL
    11 AM PDT FRIDAY FOR FIRE WEATHER ZONES 509... 511...512...513...
    516...517...518...528...529 AND 530...
    * AFFECTED AREA...FIRE WEATHER ZONES 509...511...512...513...
    516...517...518...528...529 AND 530.
    * TIMING...SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH THURSDAY
    NIGHT...AND SHOULD END BY MID MORNING FRIDAY.
    * THUNDERSTORMS...THUNDERSTORMS ARE EXPECTED TO PRODUCE
    SIGNIFICANT LIGHTNING ACTIVITY WITH A HIGH LIKELIHOOD OF DRY
    LIGHTNING.
    * IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.
    WINDS CAN CHANGE SUDDENLY IN THE VICINITY OF THUNDERSTORMS.

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