Alert archive / California / Red Flag Warnings in 2017

Red Flag Warning 5, NWS San Francisco Bay Area, CA

September 30, 2017

NWS San Francisco Bay Area, CA issued this red flag warning at Sep 30, 2017, 9:57 AM PDT. It took effect at Sep 30, 2017, 11:00 PM PDT. It was in force for 64 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 30, 2017, 9:57 AM PDT (16:57 UTC)
In effect from
Sep 30, 2017, 11:00 PM PDT
Expired
Oct 3, 2017, 2:35 PM PDT
In force
64 hr
Issued by
NWS San Francisco Bay Area, CA

The text

As transmitted.

458 
WWUS86 KMTR 301657
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
957 AM PDT Sat Sep 30 2017

...Gusty Offshore Winds and Low Humidity through Monday...

.Gusty offshore winds arrive overnight tonight and increase in
strength for Sunday and Monday. These winds will promote a
significant drying trend and bring poor overnight recoveries (as 
low as the upper 20s to mid 30s in places) and low daytime 
humidities (in the upper single digits to low teens). The gusty 
winds and low humidity values will combine to bring critical fire 
weather conditions. 

CAZ507-511-010400-
/O.UPG.KMTR.FW.A.0002.171001T0400Z-171002T0300Z/
/O.NEW.KMTR.FW.W.0005.171001T0600Z-171003T0600Z/
North Bay Mountains-East Bay Hills and the Diablo Range-
957 AM PDT Sat Sep 30 2017

...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 PM
PDT MONDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE 
WEATHER ZONES 507 AND 511...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 PM this evening to 11 PM
PDT Monday. The Fire Weather Watch is no longer in effect. 

* AFFECTED AREA...Fire weather zones 507 and 511.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Northerly winds will be
  strongest on Sunday around and after sunset through sunrise
  Monday.
  
* HUMIDITY...Overnight relative humidity recoveries as low as
  25-35%. Daytime minimum humidity values as low the upper single
  digits to low teens. 

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest. 

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

&&

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.

&&

$$
9 follow-up statements
632 
WWUS86 KMTR 302320
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
420 PM PDT Sat Sep 30 2017

...Gusty Offshore Winds and Low Humidity through Monday...

.Gusty offshore winds arrive overnight tonight and increase in
strength for Sunday and Monday. These winds will promote a
significant drying trend and bring poor overnight recoveries (as
low as the upper 20s to mid 30s in places) and low daytime
humidities (in the upper single digits to low teens). The gusty
winds and low humidity values will combine to bring critical fire
weather conditions.

CAZ507-511-011130-
/O.CON.KMTR.FW.W.0005.171001T0600Z-171003T0600Z/
North Bay Mountains-East Bay Hills and the Diablo Range-
420 PM PDT Sat Sep 30 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO
11 PM PDT MONDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR 
FIRE WEATHER ZONES 507 AND 511...

* AFFECTED AREA...Fire weather zones 507 and 511.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph. Northerly winds 
  will be strongest on Sunday around and after sunset through 
  sunrise Monday.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
098 
WWUS86 KMTR 011035
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
335 AM PDT Sun Oct 1 2017

...Gusty Offshore Winds and Low Humidity through Monday...

.Gusty offshore winds are forecast to increase in strength for 
late this evening and persist into Monday. These winds will 
promote a significant drying trend and bring poor overnight 
recoveries (as low as the upper 20s to mid 30s in places) and low 
daytime humidities (in the upper single digits to low teens). The 
gusty winds and low humidity values will combine to bring critical
fire weather conditions to the North Bay Mountains and East Bay
Hills.

CAZ507-511-012300-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
North Bay Mountains-East Bay Hills and the Diablo Range-
335 AM PDT Sun Oct 1 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT MONDAY FOR
GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES
507 AND 511...

* AFFECTED AREA...Fire weather zones 507 and 511.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph. Northerly winds 
  will be strongest on Sunday around and after sunset through 
  sunrise Monday.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
122 
WWUS86 KMTR 011613
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
913 AM PDT Sun Oct 1 2017

...Gusty Offshore Winds and Low Humidity now into Tuesday...

.Gusty offshore winds are forecast to increase late this evening
and persist into Tuesday. These winds will promote a significant 
drying trend and bring poor overnight recoveries (as low as the 
upper 20s to mid 30s in places) and low daytime humidities (in the
upper single digits to low teens). The gusty winds and low 
humidity values will combine to bring critical fire weather 
conditions to the North Bay Mountains and East Bay Hills. For
Monday Night into Tuesday... the critical fire weather conditions
shift to just the North Bay Mountains.

CAZ507-020400-
/O.EXT.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
913 AM PDT Sun Oct 1 2017

...RED FLAG WARNING NOW IN EFFECT UNTIL 5 PM PDT TUESDAY FOR GUSTY
OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE 507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Northerly winds will be
  strongest from sunset Sunday through sunrise Monday and again  
  sunset Monday into Tuesday morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$

CAZ511-020400-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
East Bay Hills and the Diablo Range-
913 AM PDT Sun Oct 1 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT MONDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE 
511...

* AFFECTED AREA...Fire weather zone 511.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Mount Diablo has already
  gusted to 50 mph as of Sunday morning. Northerly winds will be
  strongest from sunset Sunday through sunrise Monday.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
026 
WWUS86 KMTR 012135
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
235 PM PDT Sun Oct 1 2017

...Gusty Offshore Winds and Low Humidity now into Tuesday...

.Gusty offshore winds are forecast to increase late this evening
and persist into Tuesday. These winds will promote a significant
drying trend and bring poor overnight recoveries (as low as the
mid 20s to mid 30s in places) and low daytime humidities (in the 
upper single digits to low teens). The gusty winds and low 
humidity values will combine to bring critical fire weather 
conditions to the North Bay Mountains and East Bay Hills. For 
Monday Night into Tuesday... the critical fire weather conditions 
shift to just the North Bay Mountains.

CAZ507-021200-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
235 PM PDT Sun Oct 1 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE 
507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph. Northerly winds 
  will be strongest from sunset Sunday through sunrise Monday 
  and again sunset Monday into Tuesday morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$

CAZ511-021200-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
East Bay Hills and the Diablo Range-
235 PM PDT Sun Oct 1 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT MONDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE 
511...

* AFFECTED AREA...Fire weather zone 511.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph. Mount Diablo has 
  already gusted to 50 mph as of Sunday morning. Northerly 
  winds will be strongest from sunset Sunday through sunrise 
  Monday.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
581 
WWUS86 KMTR 021032
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
332 AM PDT Mon Oct 2 2017

...Gusty Offshore Winds and Low Humidity into Tuesday...

.Breezy and gusty offshore winds are forecast to persist today
through Tuesday, especially in the North Bay Mountains and East 
Bay Hills. These winds will combine with low relative humidity 
values and result in critical fire weather conditions, especially 
in the higher elevations. 

CAZ507-022200-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
332 AM PDT Mon Oct 2 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE
507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Northerly winds will be
  strongest through sunrise Monday and again sunset Monday into 
  Tuesday morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$

CAZ511-022200-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
East Bay Hills and the Diablo Range-
332 AM PDT Mon Oct 2 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE
WEATHER ZONE 511...

* AFFECTED AREA...Fire weather zone 511.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Mount Diablo has already
  gusted to 50 mph as of Monday morning. Northerly winds will be
  strongest through sunrise Monday. 

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
333 
WWUS86 KMTR 022121
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
221 PM PDT Mon Oct 2 2017

...Gusty Offshore Winds and Low Humidity into Tuesday...

.Breezy and gusty offshore winds are forecast to persist through 
Tuesday, especially in the North Bay Mountains and East Bay Hills.
These winds will combine with low relative humidity values and 
result in critical fire weather conditions, especially in the 
higher elevations.

CAZ507-030545-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
221 PM PDT Mon Oct 2 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE
507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Northerly winds will be
  strongest sunset tonight into Tuesday morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  20-30%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$

CAZ511-030545-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
East Bay Hills and the Diablo Range-
221 PM PDT Mon Oct 2 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE
WEATHER ZONE 511...

* AFFECTED AREA...Fire weather zone 511.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  25-35%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
703 
WWUS86 KMTR 030604
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
1104 PM PDT Mon Oct 2 2017

...Gusty Offshore Winds and Low Humidity into Tuesday...

.Breezy and gusty offshore winds are forecast to persist through
Tuesday, especially in the North Bay Mountains. These winds will 
combine with low relative humidity values and result in critical 
fire weather conditions, especially in the higher elevations.

CAZ511-030715-
/O.EXP.KMTR.FW.W.0005.000000T0000Z-171003T0600Z/
East Bay Hills and the Diablo Range-
1104 PM PDT Mon Oct 2 2017

...RED FLAG WARNING HAS EXPIRED FOR GUSTY OFFSHORE WINDS AND LOW
HUMIDITIES FOR FIRE WEATHER ZONE 511...

Wind speeds have diminished across the East Bay Hills and the
Diablo Range this evening. While breezy conditions will be
possible through the night and relative humidity recoveries will
remain poor, the threat for explosive fire growth has diminished.

$$

CAZ507-031600-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
1104 PM PDT Mon Oct 2 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE WEATHER ZONE
507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with 
  gusts generally up to 35 mph, locally higher. Gusts over 
  peaks and ridges up to or exceeding 50 mph. Northerly winds 
  will be strongest sunset tonight into Tuesday morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  20-30%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
037 
WWUS86 KMTR 031049
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
349 AM PDT Tue Oct 3 2017

...Gusty Offshore Winds and Low Humidity Today...

.Breezy and gusty offshore winds are forecast to persist through
this evening, especially in the North Bay Mountains. These winds 
will combine with low relative humidity values and result in 
critical fire weather conditions, especially in the higher 
elevations.

CAZ507-040000-
/O.CON.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
349 AM PDT Tue Oct 3 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM PDT THIS
AFTERNOON FOR GUSTY OFFSHORE WINDS AND LOW HUMIDITIES FOR FIRE
WEATHER ZONE 507...

* AFFECTED AREA...Fire weather zone 507.

* WIND...North to northeast winds sustained 10 to 25 mph with
  gusts generally up to 35 mph, locally higher. Gusts over peaks
  and ridges up to or exceeding 50 mph. Northerly winds will be
  strongest through this morning.

* HUMIDITY...Overnight relative humidity recoveries as low as 
  20-30%. Daytime minimum humidity values as low the upper 
  single digits to low teens.

* HIGHEST THREAT...In elevations above 1000 feet where winds 
  will be the strongest and humidity recoveries the poorest.

* IMPACTS...Any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended. Downed powerlines in 
  remote areas will likely cause new fire starts.

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.

&&

$$
823 
WWUS86 KMTR 032135
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
235 PM PDT Tue Oct 3 2017

CAZ507-032245-
/O.CAN.KMTR.FW.W.0005.000000T0000Z-171004T0000Z/
North Bay Mountains-
235 PM PDT Tue Oct 3 2017

...RED FLAG WARNING IS CANCELLED FOR FOR FIRE WEATHER ZONE 507...

The National Weather Service in San Francisco has cancelled the
Red Flag Warning for the North Bay Mountains.  

Dry and warm conditions continue this afternoon but offshore winds
are easing. Therefore the Red Flag Warning has been cancelled. 

$$

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 30, 2:23 AM PDTSmall Craft AdvisoryMTR44 hr

Nearby

Red Flag Warnings in California, 2017Every red flag warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.