Red Flag (Fire Weather) Warning for North Bay Mountains, CA

This alert expired on October 15, 2017 at 8:00:00 AM PDT
National Weather Service
Alert area: North Bay Mountains

Posted October 14, 2017 at 5:07:00 PM PDT

...RED FLAG WARNING REMAINS IN EFFECT THROUGH 8 AM PDT SUNDAY FOR
THE NORTH BAY MOUNTAINS...

...RED FLAG WARNING NOW IN EFFECT THROUGH 8 AM PDT SUNDAY FOR THE
EAST BAY HILLS AND THE DIABLO RANGE...

...RED FLAG WARNING FOR THE NORTH BAY VALLEYS WILL BE ALLOWED TO
EXPIRE AT 5 PM PDT SATURDAY...

.Northeast to east winds had decreased in most areas late Saturday
afternoon and are expected to remain mostly light through
Saturday evening. However, easterly winds are forecast to
increase in the hills of the North and East Bay late tonight.
Winds in the hills tonight are not expected to be as strong as
last night, but still strong enough to create critical fire
weather conditions when combined with the warm and very dry
airmass and dry fuels. Expect very poor overnight humidity
recoveries in the North Bay Mountains and East Bay Hills tonight
with relative humidity values remaining below 30 percent, and even
below 20 percent on the higher ridges. Minimum relative humidity
values on Sunday are forecast to be 10 to 20 percent and as low as
the single digits in the hills. In addition, high temperatures on
Sunday are forecast to be warmer than Saturday by about five
degrees. Overnight relative humidity recoveries are expected to
be better for North Bay Valleys and winds will mostly be light in
the valleys.
Warm and very dry conditions are forecast to continue into Monday,
but winds will generally be light, even in the hills, from mid
morning Sunday through Monday.

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM PDT SUNDAY FOR
LOW RELATIVE HUMIDITIES AND OFFSHORE WINDS FOR FIRE WEATHER ZONE
507...

* AFFECTED AREA...Fire weather zone 507. North Bay Mountains.

* WIND...North to northeast winds of 10 to 15 mph with gusts of 25
and with isolated gusts to 30 mph possible on highest ridges and
peaks. Strongest winds expected in the Napa Hills and hills of
eastern Sonoma County between midnight and sunrise early Sunday
morning.

* HUMIDITY...Minimum daytime values between 5 to 15 percent
with night time recovery values between 15 to 35 percent.

* HIGHEST THREAT...The Napa County hills, around Mount Saint
Helena, hills of eastern Sonoma County.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Recommended actions

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...and warm temperatures can
contribute to extreme fire behavior.
ready.gov

Tips from ready.gov


Excerpted from ready.gov
Before:

  • To begin preparing, you should build an emergency kit and make a family communications plan.

  • Plant fire-resistant shrubs and trees. For example, hardwood trees are less flammable than pine, evergreen, eucalyptus or fir trees.
    Regularly clean roof and gutters.

  • Use 1/8-inch mesh screen beneath porches, decks, floor areas, and the home itself. Also, screen openings to floors, roof and attic.

  • Keep handy household items that can be used as fire tools: a rake, axe, handsaw or chain saw, bucket and shovel.

  • Consider installing protective shutters or heavy fire-resistant drapes.

  • Clear items that will burn from around the house, including wood piles, lawn furniture, barbecue grills, tarp coverings, etc. Move them outside of your defensible space.

  • Identify and maintain an adequate outside water source such as a small pond, cistern, well, swimming pool, or hydrant.

  • Have a garden hose that is long enough to reach any area of the home and other structures on the property.

  • More about what to do before a wildfire.

Excerpted from ready.gov
During:

  • Wear protective clothing when outside – sturdy shoes, cotton or woolen clothes, long pants, a long-sleeved shirt, gloves and a handkerchief to protect your face.

  • Close outside attic, eaves and basement vents, windows, doors, pet doors, etc. Remove flammable drapes and curtains. Close all shutters, blinds or heavy non-combustible window coverings to reduce radiant heat.

  • Close all doors inside the house to prevent draft. Open the damper on your fireplace, but close the fireplace screen.

  • Shut off any natural gas, propane or fuel oil supplies at the source.

  • Connect garden hoses to outdoor water faucet and fill any pools, hot tubs, garbage cans, tubs or other large containers with water.

  • Place lawn sprinklers on the roof and near above-ground fuel tanks. Leave sprinklers on and dowsing these strutures as long as possible.

  • If you have gas-powered pumps for water, make sure they are fueled and ready.
    Place a ladder against the house in clear view.

  • More about what to do during a wildfire.

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