Alert archive / California / Red Flag Warnings in 2017

Red Flag Warning 6, NWS San Francisco Bay Area, CA

October 6, 20178 counties in California

NWS San Francisco Bay Area, CA issued this red flag warning at Oct 6, 2017, 9:49 AM PDT for 8 counties in California. It took effect at Oct 8, 2017, 11:00 AM PDT. It was in force for 42 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
Oct 6, 2017, 9:49 AM PDT (16:49 UTC)
In effect from
Oct 8, 2017, 11:00 AM PDT
Expired
Oct 10, 2017, 5:00 AM PDT
In force
42 hr
Issued by
NWS San Francisco Bay Area, CA

Counties Alameda County, CA, Contra Costa County, CA, Marin County, CA, Napa County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 77 km from the middle of the area, began a volume at 16:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 4.8 hours before the alert went out and 8 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2017-10-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2017-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2597 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WWUS86 KMTR 061649
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
949 AM PDT Fri Oct 6 2017

...Red Flag Warning Sunday through late Monday night...

.A classic autumn fire weather pattern is forecast to develop
later this weekend into early next week. Warm temperatures, low
humidity and gusty north winds will coincide with critically dry
fuels. Current indications suggest this will be the strongest
offshore wind event so far this fall.

CAZ507-070400-
/O.UPG.KMTR.FW.A.0003.171008T1800Z-171010T1200Z/
/O.NEW.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Mountains-
949 AM PDT Fri Oct 6 2017

...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 5 AM PDT
TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE 
WEATHER ZONE 507...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 AM Sunday to 5 AM PDT
Tuesday. The Fire Weather Watch is no longer in effect. 


* WIND...Northeast winds 15 to 30 mph gusts 40 to 55 mph.

* HUMIDITY...10-20 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...is located in the Napa County hills as well 
  as around Mount Saint Helena and the hills of Marin around 
  Mount Tamalpais.

* 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.

&&

$$

CAZ511-070400-
/O.UPG.KMTR.FW.A.0003.171008T1800Z-171010T1200Z/
/O.NEW.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Hills and the Diablo Range-
949 AM PDT Fri Oct 6 2017

...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 5 AM PDT
TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE 
WEATHER ZONE 511...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 AM Sunday to 5 AM PDT
Tuesday. The Fire Weather Watch is no longer in effect. 


* WIND...North to Northeast winds 15 to 30 mph frequent gusts 
  40-55 mph expected above 2000 feet. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

* 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.

&&

$$

CAZ512-070400-
/O.NEW.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
Santa Cruz Mountains-
949 AM PDT Fri Oct 6 2017

...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 5 AM PDT
TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE 
WEATHER ZONE 512...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 AM Sunday to 5 AM PDT
Tuesday. 

* WIND...North to Northeast winds 10 to 20 mph frequent gusts
  30-40 mph expected above 2000 feet. 

* HUMIDITY...15 to 25 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet, especially Ben
  Lomond.

* 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.

&&

$$

CAZ510-070400-
/O.NEW.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Interior Valleys-
949 AM PDT Fri Oct 6 2017

...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 5 AM PDT
TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE 
WEATHER ZONE 510...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 AM Sunday to 5 AM PDT
Tuesday. 

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30
  mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 25-35 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including far
  eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-070400-
/O.NEW.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Interior Valleys-
949 AM PDT Fri Oct 6 2017

...RED FLAG WARNING IN EFFECT FROM 11 AM SUNDAY TO 5 AM PDT
TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE 
WEATHER ZONE 506...

The National Weather Service in San Francisco has issued a Red
Flag Warning, which is in effect from 11 AM Sunday to 5 AM PDT
Tuesday. 

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30
  mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 25-35 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and
  Northern Sonoma.

* 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.

&&

$$
7 follow-up statements
788 
WWUS86 KMTR 070357
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
857 PM PDT Fri Oct 6 2017

...Red Flag Warning Sunday through late Monday night...

.A classic autumn fire weather pattern is forecast to develop
later this weekend into early next week. Warm temperatures, low
humidity and gusty north winds will coincide with critically dry
fuels. Current indications suggest this will be the strongest
offshore wind event so far this fall.

CAZ507-072230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Mountains-
857 PM PDT Fri Oct 6 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 507...

* WIND...Northeast winds 15 to 30 mph gusts 40 to 55 mph.

* HUMIDITY...10-20 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...is located in the Napa County hills as well 
  as around Mount Saint Helena and the hills of Marin around 
  Mount Tamalpais.

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

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.

&&

$$

CAZ511-072230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Hills and the Diablo Range-
857 PM PDT Fri Oct 6 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 511...

* WIND...North to Northeast winds 15 to 30 mph frequent gusts 
  40-55 mph expected above 2000 feet. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

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.

&&

$$

CAZ512-072230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
Santa Cruz Mountains-
857 PM PDT Fri Oct 6 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 512...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 
  30-40 mph expected above 2000 feet. 

* HUMIDITY...15 to 25 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet, especially Ben 
  Lomond.

* 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.

&&

$$

CAZ510-072230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Interior Valleys-
857 PM PDT Fri Oct 6 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 510...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 25-35 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including
  far eastern portions of Contra Costa County. 

* 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.

&&

$$

CAZ506-072230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Interior Valleys-
857 PM PDT Fri Oct 6 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 506...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 25-35 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  Northern Sonoma.

* 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.

&&

$$
538 
WWUS86 KMTR 072224
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
324 PM PDT Sat Oct 7 2017

...Red Flag Warning Sunday through late Monday night...

.A classic autumn fire weather pattern is forecast to develop
later this weekend. Warm temperatures, low humidity and locally
strong north to northeast winds will coincide with critically dry
fuels. Current indications suggest this will be the strongest 
offshore wind event so far this fall. Strongest winds are expected
across the North and East Bay, and locally in the Santa Cruz
Mountains. Winds will decrease Monday and Monday night, but a 
very dry airmass will persist into Monday night.

CAZ507-081300-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Mountains-
324 PM PDT Sat Oct 7 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 507...

* WIND...Northeast winds 15 to 30 mph gusts 40 to 55 mph.

* HUMIDITY...10-20 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...will be across the Napa and Sonoma County 
  hills as well as around Mount Tamalpais in Marin County.

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

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.

&&

$$

CAZ511-081300-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Hills and the Diablo Range-
324 PM PDT Sat Oct 7 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 511...

* WIND...North to Northeast winds 15 to 25 mph frequent gusts
  35-45 mph expected above 2000 feet. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

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.

&&

$$

CAZ512-081300-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
Santa Cruz Mountains-
324 PM PDT Sat Oct 7 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 512...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts
  25-35 mph expected above 2000 feet. 

* HUMIDITY...15 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet.

* 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.

&&

$$

CAZ510-081300-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Interior Valleys-
324 PM PDT Sat Oct 7 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 510...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 30-45 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including 
  far eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-081300-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Interior Valleys-
324 PM PDT Sat Oct 7 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SUNDAY TO 5 AM
PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE
WEATHER ZONE 506...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 25-40 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  northern Sonoma County valleys.

* 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.

&&

$$
908 
WWUS86 KMTR 081123
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
423 AM PDT Sun Oct 8 2017

...Red Flag Warning Today Through Late Monday Night...

.A classic autumn fire weather pattern is forecast to develop
by late today. Warm temperatures, low humidity and locally strong
north to northeast winds will coincide with critically dry fuels.
Current indications suggest this will be the strongest offshore 
wind event so far this fall. Strongest winds are expected across 
the North and East Bay, and locally in the Santa Cruz Mountains. 
Winds will decrease Monday and Monday night, but a very dry 
airmass will persist into Monday night.

CAZ507-082230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Mountains-
423 AM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 AM PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR
FIRE WEATHER ZONE 507...

* WIND...Northeast winds 20 to 35 mph with frequent gusts of 40 
  to 55 mph.

* HUMIDITY...10-20 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...will be across the Napa and Sonoma County 
  hills as well as around Mount Tamalpais in Marin County.

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

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.

&&

$$

CAZ511-082230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Hills and the Diablo Range-
423 AM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 AM PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR
FIRE WEATHER ZONE 511...

* WIND...North to Northeast winds 15 to 25 mph with frequent gusts
  of 35 to 45 mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

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.

&&

$$

CAZ512-082230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
Santa Cruz Mountains-
423 AM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 AM PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR
FIRE WEATHER ZONE 512...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 
  25-35 mph expected above 2000 feet. 

* HUMIDITY...15 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet.

* 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.

&&

$$

CAZ510-082230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
East Bay Interior Valleys-
423 AM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 AM PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR
FIRE WEATHER ZONE 510...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 30-45 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including 
  far eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-082230-
/O.CON.KMTR.FW.W.0006.171008T1800Z-171010T1200Z/
North Bay Interior Valleys-
423 AM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 AM PDT TUESDAY FOR STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR
FIRE WEATHER ZONE 506...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 25-40 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  northern Sonoma County valleys.

* 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.

&&

$$
651 
WWUS86 KMTR 082151
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
251 PM PDT Sun Oct 8 2017

...Red Flag Warning Today Until 5 am Tuesday morning...

.A stronger than usual offshore wind flow pattern will develop 
tonight into Monday. Warm temperatures, low humidity and locally 
strong north to northeast winds will coincide with critically dry 
fuels. Models forecast this to be the strongest offshore wind 
event so far this fall. The strongest winds are expected across 
the North and East Bay, and locally in the Santa Cruz Mountains,
however winds will also pick up over the valleys resulting in red
flag warning conditions there as well. Winds will generally decrease
by Monday night, but a very dry airmass will persist into early 
Tuesday morning.

CAZ507-091300-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Mountains-
251 PM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 507...

* WIND...Northeast winds 20 to 35 mph with frequent gusts of 40 
  to 55 mph. 

* HUMIDITY...10-20 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...will be across the Napa and Sonoma County 
  hills as well as around Mount Tamalpais in Marin County.

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

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.

&&

$$

CAZ511-091300-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Hills and the Diablo Range-
251 PM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 511...

* WIND...North to Northeast winds 15 to 25 mph with frequent 
  gusts of 35 to 45 mph. 

* HUMIDITY...12 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

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.

&&

$$

CAZ512-091300-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
Santa Cruz Mountains-
251 PM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 512...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 
  25-35 mph expected above 2000 feet. 

* HUMIDITY...15 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet.

* 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.

&&

$$

CAZ510-091300-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Interior Valleys-
251 PM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 510...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 30-45 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including 
  far eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-091300-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Interior Valleys-
251 PM PDT Sun Oct 8 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 506...

* WIND...North to Northeast winds 10 to 20 mph frequent gusts 30 
  mph. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 25-40 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  northern Sonoma County valleys.

* 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.

&&

$$
499 
WWUS86 KMTR 091224
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
524 AM PDT Mon Oct 9 2017

...Red Flag Warning Until 5 am Tuesday morning...

.Strong and gusty northeast winds will continue through this
morning, especially in the North and East Bay. Warm temperatures,
low humidity and locally strong winds will coincide with 
critically dry fuels. Winds will decrease by this afternoon, but 
a very dry airmass will persist into tonight.

CAZ507-092330-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Mountains-
524 AM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE
507...

* WIND...Northeast winds 20 to 35 mph this morning, with frequent
  gusts of 40 to 55 mph. Winds becoming east 10 to 20 mph by
  midday.

* HUMIDITY...8-15 percent afternoon with night time recovery 
  under 30 percent.

* HIGHEST THREAT...will be across the Napa and Sonoma County 
  hills as well as around Mount Tamalpais in Marin County.

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

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.

&&

$$

CAZ511-092330-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Hills and the Diablo Range-
524 AM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE
511...

* WIND...North to Northeast winds 15 to 25 mph this morning, with
  frequent gusts of 35 to 45 mph. Winds becoming east 10 to 20 mph
  by midday.

* HUMIDITY...8 to 15 percent afternoons. Recovering 20-30 percent
  overnight.

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

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.

&&

$$

CAZ512-092330-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
Santa Cruz Mountains-
524 AM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
STRONG OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE
512...

* WIND...North to Northeast winds 10 to 20 mph this morning with
  frequent gusts 25-35 mph expected above 2000 feet. Winds
  becoming south 5 to 15 mph in the afternoon with local gusts to
  25 mph.

* HUMIDITY...10 to 20 percent afternoons. Recovering 20-30 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet.

* 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.

&&

$$

CAZ510-092330-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Interior Valleys-
524 AM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 510...

* WIND...North to Northeast winds 10 to 20 mph this morning with
  frequent gusts 30 mph. Winds decreasing to 5 to 15 mph in the
  afternoon. 

* HUMIDITY...10 to 20 percent afternoons. Recovering 30-45 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including 
  far eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-092330-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Interior Valleys-
524 AM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
GUSTY OFFSHORE WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 506...

* WIND...North to Northeast winds 10 to 20 mph this morning with
  frequent gusts 30 mph. Winds shifting to the south and decreasing
  to 5 to 15 mph in the afternoon.

* HUMIDITY...10 to 20 percent afternoons. Recovering 25-40 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  northern Sonoma County valleys.

* 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.

&&

$$
554 
WWUS86 KMTR 092251
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
351 PM PDT Mon Oct 9 2017

...Red Flag Warning Until 5 am Tuesday morning...

.Red Flag Warning remains in effect overnight for ongoing
wildfires, shifting winds and low humidity that will be a direct
threat to life and property.

CAZ507-100700-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Mountains-
351 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
SHIFTING WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 507...

* WIND...Southwest winds 10 to 15 mph gusts to 20 mph.

* HUMIDITY...8-15 percent through sunset then recovering 50-60
  percent below 1000 feet in Napa and Sonoma Valleys. Recovery 
  only 20 to 30 percent for interior hills of Napa County 
  including the Atlas Fire.

* HIGHEST THREAT...will be across the Napa and Sonoma County hills.

* IMPACTS...Shifting winds may push the fire in new directions.

A Red Flag Warning means that critical fire weather conditions
are either occurring now. A combination of shifting winds...low 
relative humidity...and warm temperatures can contribute to 
extreme fire behavior.

&&

$$

CAZ511-100700-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Hills and the Diablo Range-
351 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
SHIFTING WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 511...

* WIND...Southwest 5 to 15 mph gusts to 20 mph. 

* HUMIDITY...8 to 15 percent afternoons. Recovering 25-35 percent
  overnight. 

* HIGHEST THREAT...is located around Mount Diablo and the East 
  Bay Hills between interstate 880 and 680.

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

A Red Flag Warning means that critical fire weather conditions
are either occurring now. A combination of strong winds...low 
relative humidity...and warm temperatures can contribute to 
extreme fire behavior.

&&

$$

CAZ512-100700-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
Santa Cruz Mountains-
351 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
SHIFTING WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 512...

* WIND...Winds becoming southwest 5 to 15 mph with local gusts to
  25 mph. 

* HUMIDITY...10 to 20 percent through sunset. Recovering 25-35 
  percent overnight.

* HIGHEST THREAT...is located above 2000 feet.

* 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.

&&

$$

CAZ510-100700-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Interior Valleys-
351 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
SHIFTING WIND AND LOW HUMIDITY FOR FIRE WEATHER ZONE 510...

* WIND...Southwest winds 5 to 15 mph gusts to 20 mph.
 
* HUMIDITY...10 to 20 percent this afternoon. Recovering 30-45 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Delta including 
  far eastern portions of Contra Costa County.

* 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.

&&

$$

CAZ506-100700-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Interior Valleys-
351 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
SHIFTING WINDS FOR FIRE WEATHER ZONE 506...

* WIND...Winds shifting to the south 10 to 15 mph with gusts 20
  mph. 

* HUMIDITY...10 to 20 percent through sunset. Recovering 25-40 
  percent overnight.

* HIGHEST THREAT...Windy locations through the Napa Valley and 
  northern Sonoma County valleys.

* IMPACTS...ongoing fires may shift in different directions as
  southerly winds develop.

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.

&&

$$
552 
WWUS86 KMTR 100347
RFWMTR

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco CA
847 PM PDT Mon Oct 9 2017

...Red Flag Warning Until 5 am Tuesday morning for the North Bay...

.Red Flag Warning remains in effect overnight for ongoing
wildfires, shifting winds and low humidity that will be a direct
threat to life and property.

CAZ510>512-100500-
/O.CAN.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-
847 PM PDT Mon Oct 9 2017

...RED FLAG WARNING IS CANCELLED FOR FOR FIRE
WEATHER ZONES 510, 511, AND 512...

The National Weather Service in San Francisco has cancelled the
Red Flag Warning for the East Bay and Santa Cruz Mountains. 

Onshore winds are gradually returning with lighter wind speeds,
higher humidity and cooler temperatures.

$$

CAZ507-101200-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Mountains-
847 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
ONGOING FIRES AND SHIFTING WINDS FOR FIRE WEATHER ZONE 507...

* WIND...Southwest winds 5 to 15 mph gusts to 20 mph.

* HUMIDITY...Recovering 50-60 percent below 1000 feet in Napa 
  and Sonoma Valleys. Recovery only 20 to 30 percent for interior 
  hills of Napa County including the Atlas Fire.

* HIGHEST THREAT...will be across the Napa and Sonoma County
  hills.

* IMPACTS...Shifting winds may push the fire in new directions.

A Red Flag Warning means that critical fire weather conditions
are either occurring now. A combination of shifting winds...low
relative humidity...and warm temperatures can contribute to
extreme fire behavior.

&&

$$

CAZ506-101200-
/O.CON.KMTR.FW.W.0006.000000T0000Z-171010T1200Z/
North Bay Interior Valleys-
847 PM PDT Mon Oct 9 2017

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR
ONGOING FIRES AND SHIFTING WINDS FOR FIRE WEATHER ZONE 506...

* WIND...Winds shifting to the south 5 to 15 mph with gusts 20 mph. 

* HUMIDITY...Recovering 25-45 percent overnight.

* HIGHEST THREAT...Locations with ongoing fires through the Napa Valley 
  and northern Sonoma County valleys.

* IMPACTS...ongoing fires may shift in different directions as 
  southerly winds develop.

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.

&&

$$

What forecasters said that day

The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this red flag warning went out at Oct 6, 8:31 AM PDT, 1 hour 18 minutes earlier.

Area forecast discussion, Oct 6, 8:31 AM PDT, 1 hour 18 minutes before
Area Forecast Discussion
National Weather Service San Francisco Bay Area
831 AM PDT Fri Oct 6 2017

.SYNOPSIS...General warming trend with dry weather through the
end of the week and into the weekend. Dry offshore winds will
cause breezy conditions especially over the North Bay starting
Sunday evening. Slightly cooler weather expected next week.

&&

.DISCUSSION...as of 8:30 AM PDT Friday...Clear skies and warm
temperatures can be expected across our entire region today as
offshore flow will combine with a severely squashed marine layer.
Highs will be mostly in the 70s at the coast with 80s to lower 90s
inland. For many areas today will be the warmest day of the week.

Biggest concern for the public today is the ridge of high pressure
that will build into the Great Basin on Sunday. This will set up a
strong pressure gradient between our region and spots to the east.
Highest speeds will be over the North Bay with gusts over 40 mph
likely by Sunday evening/night. Unless 12Z guidance greatly
changes a wind advisory will be issued. Fire weather concerns will
also be greatly elevated during this time.

.PREVIOUS DISCUSSION...Clear skies across the district allowing
good viewing of the Harvest Moon. There were a few wisps of
stratus moving south along the San Mateo county coast earlier, but
those have since dissipated. Some haze or ground fog is showing
up on GOES-16 fog product along the eastern edge of the Salinas
Valley. There is only the shallowest of inversions apparent on the
Fort Ord profiler, only 100 feet at most. Thus, do not anticipate
any visibility or ceiling issues at area airports this morning.

An upper level ridge building along the coast will bring warmer
temperatures to the area today and Saturday. Highs today and
Saturday are expected to range from the 70s at the coast to the
80s to mid 90s inland. Temperatures are expected to begin to cool
slightly beginning Sunday and through the rest of next week.

Meanwhile, a surface high over the northern Great Basin will ramp
up offshore flow by Sunday and Monday resulting in gusty winds
and enhanced fire weather concerns across mainly the North and
East Bay Hills late in the weekend and early next week. Winds are
expected to lessen by midweek as a weak upper level trough
settles in over California. This will also help max temps return
closer to seasonal normals by the end of the week.

&&

.AVIATION...As of 4:29 AM PDT Friday...For 12z Tafs. Minimal
changes from last aviation package. VFR conditions with generally light
onshore flow through the forecast period. The marine layer will
remain extremely shallow and any low clouds that develop will
remain confined to the coast.

High confidence.

Vicinity of KSFO...VFR with only a few high clouds through today.
Light offshore winds this morning will increase and turn westerly
by afternoon, 15-20 kt.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...VFR. Light and variable winds through
the morning, increasing out of the west/northwest this afternoon,
around 10 kt.

&&

.FIRE WEATHER...as of 2:48 AM PDT Friday...Increased northeast
winds will persist into the morning hours with strongest winds in
the hills of Napa county...but all of the North and East Bay hills
will see offshore winds with poor humidity recovery this morning.
Offshore winds will decrease by tonight and Saturday bringing
some cooling and higher humidity to the coast. Northerly winds
increase Sunday as an upper trough deepens over the Great Basin.
Strong northerly winds possible Sunday night into Monday as models
indicate 925 mb winds up to 45-50 kt. A fire weather watch is in
effect for the North and East Bay Hills for Sunday afternoon
through Monday night.

&&

.MARINE...as of 03:58 AM PDT Friday...Long period northwesterly
and southwesterly swells will continue through the weekend. The
mixed swell will result in an enhanced risk of large shore breaks
and rip currents at the beaches. Strong northerly winds are
forecast to develop later this evening as coastal troughing
interacts with high pressure over the Eastern Pacific. Strong
winds will last through the weekend, increasing to Gale or near
Gale force for the northern outer ocean waters by Sunday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .Tday...SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM

&&

PUBLIC FORECAST: Bell/Sims
AVIATION: BAM
MARINE: BAM

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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 5, 9:03 PM PDTSmall Craft AdvisoryMTR3 days
Oct 6, 2:40 AM PDTSmall Craft AdvisoryMTR3 days
Oct 6, 12:44 PM PDTWind AdvisoryMTRAlameda, Contra Costa, Marin, Napa, Sonoma68 hr
Oct 6, 1:53 PM PDTGale WarningMTR55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.