WEATHER »
  • Red Flag Warning for San Francisco County, California
  • Red Flag Warning issued September 02 at 12:18PM PDT until September 02 at 9:00PM PDT by NWS
  • Effective: Saturday, September 2, 2017 at 12:18 p.m.
  • Expires: Saturday, September 2, 2017 at 9 p.m.
  • ...HOT AND DRY CONDITIONS WILL CONTINUE TO IMPACT THE REGION INTO
    THE WEEKEND...ALONG WITH LOCALLY GUSTY WINDS IN THE HILLS...
    .Strong high pressure over California will continue to produce
    very hot and dry weather across the entire district through
    Saturday. After very poor humidity recoveries overnight, daytime
    relative humidity values will drop as low as the single digits
    and teens. Daytime temperatures will also once again exceed
    100 degrees across most areas and up to 110 to 115 in the hottest
    inland areas. In addition, moderate and locally gusty offshore winds
    are forecast into this evening. These weather factors will result
    in the potential for rapid fire spread in the warned area through
    at least Saturday evening.
    ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING
    FOR HOT AND DRY CONDITIONS FOR FIRE WEATHER ZONES 507, 511, 512,
    517, AND 518...
    * AFFECTED AREA...Fire weather zones 507, 511, 512, 517, and
    518. This includes elevations above 1000 feet in the North and
    East Bay Hills, the Santa Cruz Mountains, the Diablo Range,
    the Santa Lucia Range, and the interior mountains of Monterey
    and San Benito Counties.
    * WIND...North to Northeast winds 5 to 10 mph with gusts 20 mph
    during the night and North to Northwest winds 5 to 15 mph
    with gusts 20 to 25 mph during the day.
    * HUMIDITY...Daytime relative humidity values in the single
    digits and teens. Nighttime humidity recoveries very poor
    with humidity values remaining below 30 percent for locations
    in the 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.

event calendar sponsored by: