North Bay Mountains Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Heat Advisory
Issued: 3:18 AM PDT Jun. 22, 2018 – National Weather Service

... Heat advisory remains in effect from 11 am to 8 PM PDT

* timing... 11 am to 8 PM Saturday

* locations... most of the inland greater San Francisco Bay area
(excluding coastal areas), inland Monterey County, and inland
San Benito County. For the San Francisco Bay shoreline... main
heat risk is primarily from Redwood City to Cupertino.

* Temperatures... widespread temperatures in the mid 90s
to low 100s in the impacted areas are expected. The hottest
inland locations such as Pinnacles National Park and the extreme
inland portions of Napa, Sonoma, and possibly Contra Costa
counties may surpass 105 degrees. The cities of San Francisco
and Oakland are excluded from this heat advisory, but will be
very warm on Saturday with highs expected in the mid to upper
80s. San Jose, which is included in the advisory, is forecast
reach the mid to upper 90s. For the San Francisco Bay shoreline,
the main heat risks are generally from Redwood City to
Cupertino where triple digit temperatures are forecast, while
other areas of the shoreline will be noticeably cooler.

* Impacts... moderate to high risk of heat related illness,
especially for vulnerable populations during the day Saturday.
Increased number of visitors to coastal communities and beaches
to escape heat, potentially resulting in increased water
rescues. Exacerbation of critical fire weather conditions,
especially in the north and East Bay hills and mountains.

Precautionary/preparedness actions...

A heat advisory means that a period of hot temperatures is
expected. Hot temperatures will create a situation in which heat
illnesses are possible. Drink plenty of fluids... stay in an air-
conditioned room... stay out of the sun... and check up on
relatives and neighbors.

Fire Weather Watch, Fire Weather Warning
Issued: 3:20 AM PDT Jun. 22, 2018 – National Weather Service

... Fire Weather Watch remains in effect from Saturday morning
through Sunday evening for gusty north winds and low relative
humidity for fire weather zones 507 and 511...

* affected area... North Bay mountains, East Bay hills and the
Diablo Range

* wind... northerly winds of 15 to 30 mph with gusts to 40 mph.
Isolated highest terrain could see locally higher winds.

* Humidity... minimum humidity readings of 10 to 20% will be
common during the day, with the driest locations dropping
into the single digit range during the warmest, driest,
windiest times of the day.

* Highest threat... elevations above 1000 feet, especially in the
extreme northern and eastern portions of the North Bay
mountains and East Bay hills

* impacts... any fires that develop will likely spread rapidly.
Outdoor burning or other activities that may lead to fire
creation is not recommended.

Precautionary/preparedness actions...

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
red flag warnings.

300 am PDT Fri Jun 22 2018

... Red flag warning remains in effect from midnight tonight to
8 PM PDT Sunday for gusty wind and low humidity for fire weather
zones 213, 215, 216, 217, 218, 219, 220, 263, 264, 266, 267, and

* wind... northerly wind 10 to 25 mph with gusts up to 35 mph,
strongest on the west side of the Sacramento Valley extending
into the coastal range.

* Humidity... daytime minimum humidity as low as 6-12 percent with
areas of maximum humidity recovery of only 30-45 percent rh.

* Impacts... any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Precautionary/preparedness 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.

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