Alert archive / California / Red Flag Warnings in 2026

Red Flag Warning 5, NWS Eureka, CA

September 11, 2026Lake County, California

NWS Eureka, CA issued this red flag warning at Sep 11, 2026, 10:09 AM PDT for Lake County, California. It took effect at Sep 12, 2026, 10:00 AM PDT. It was in force for 16 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 11, 2026, 10:09 AM PDT (17:09 UTC)
In effect from: Sep 12, 2026, 10:00 AM PDT
Expired: Sep 13, 2026, 2:00 AM PDT
In force: 16 hr
Issued by: NWS Eureka, CA

County Lake County, CA

The radar

The Beale AFB radar (KBBX), 106 km from the middle of the area, began a volume at 17:12 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, 5.2 hours before the alert went out and 160 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1854 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

300 
WWUS86 KEKA 111709
RFWEKA

Urgent - Fire Weather Message
National Weather Service Eureka CA
1009 AM PDT Fri Sep 11 2026

CAZ418>421-120800-
/O.UPG.KEKA.FW.A.0002.260912T1700Z-260913T0900Z/
/O.NEW.KEKA.FW.W.0005.260912T1700Z-260913T0900Z/
Northern Lake Including Gravelly Valley-
Eastern Lake Including Clearlake and Middletown-
Southern Lake Including Cobb and Konocti-
Western Lake Including Lakeport-
1009 AM PDT Fri Sep 11 2026

...RED FLAG WARNING IN EFFECT FROM 10 AM SATURDAY TO 2 AM PDT
SUNDAY...

The National Weather Service in Eureka has issued a Red Flag
Warning, which is in effect from 10 AM Saturday to 2 AM PDT
Sunday.


* WIND...Northwest winds gusts of 20 to 30 mph, locally up to 40 
  for the higher ridges. 

* HUMIDITY...Relative humidity 20 to 30 percent.

* IMPACTS...Any fires that develop or are already burning 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.

&&

$$


http://weather.gov/eureka

4 follow-up statements

960 
WWUS86 KEKA 120032
RFWEKA

Urgent - Fire Weather Message
National Weather Service Eureka CA
532 PM PDT Fri Sep 11 2026

...UPDATE FOR LOCATION CLARIFICATION...

CAZ418>421-120845-
/O.CON.KEKA.FW.W.0005.260912T1700Z-260913T0900Z/
Northern Lake Including Gravelly Valley-
Eastern Lake Including Clearlake and Middletown-
Southern Lake Including Cobb and Konocti-
Western Lake Including Lakeport-
532 PM PDT Fri Sep 11 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM SATURDAY TO 2 AM
PDT SUNDAY...

* WIND...Northwest winds gusts of 20 to 30 mph, locally up to 40 
  for the higher ridges. 

* HUMIDITY...Relative humidity 20 to 30 percent.

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

* WHERE...All of Lake County, California. Including but not
  limited to Lakeport, Clearlake, Kelseyville, Upper Lake, Cobb,
  Middletown, and Lower Lake.

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.

&&

$$


http://weather.gov/eureka

657 
WWUS86 KEKA 120948
RFWEKA

Urgent - Fire Weather Message
National Weather Service Eureka CA
248 AM PDT Sat Sep 12 2026

...UPDATE FOR LOCATION CLARIFICATION...

CAZ418>421-121800-
/O.CON.KEKA.FW.W.0005.260912T1700Z-260913T0900Z/
Northern Lake Including Gravelly Valley-
Eastern Lake Including Clearlake and Middletown-
Southern Lake Including Cobb and Konocti-
Western Lake Including Lakeport-
248 AM PDT Sat Sep 12 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
2 AM PDT SUNDAY...

* WIND...Northwest winds gusts of 20 to 30 mph, locally up to 40 
  for the higher ridges. 

* HUMIDITY...Relative humidity 20 to 30 percent.

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

* WHERE...All of Lake County, California. Including, but not
  limited to; Lakeport, Clearlake, Kelseyville, Upper Lake, Cobb,
  Middletown, and Lower Lake.

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.

&&

$$


http://weather.gov/eureka

313 
WWUS86 KEKA 121751
RFWEKA

Urgent - Fire Weather Message
National Weather Service Eureka CA
1051 AM PDT Sat Sep 12 2026

CAZ418>421-130900-
/O.CON.KEKA.FW.W.0005.000000T0000Z-260913T0900Z/
Northern Lake Including Gravelly Valley-
Eastern Lake Including Clearlake and Middletown-
Southern Lake Including Cobb and Konocti-
Western Lake Including Lakeport-
1051 AM PDT Sat Sep 12 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 2 AM PDT SUNDAY...

* WIND...Northwest winds gusts of 20 to 30 mph, locally up to 40 
  for the higher ridges. 

* HUMIDITY...Relative humidity 20 to 30 percent.

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

* WHERE...All of Lake County, California. Including, but not 
  limited to; Lakeport, Clearlake, Kelseyville, Upper Lake, 
  Cobb, Middletown, and Lower Lake.

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.

&&

$$


http://weather.gov/eureka

504 
WWUS86 KEKA 130914
RFWEKA

Urgent - Fire Weather Message
National Weather Service Eureka CA
214 AM PDT Sun Sep 13 2026

CAZ418>421-131015-
/O.EXP.KEKA.FW.W.0005.000000T0000Z-260913T0900Z/
Northern Lake Including Gravelly Valley-
Eastern Lake Including Clearlake and Middletown-
Southern Lake Including Cobb and Konocti-
Western Lake Including Lakeport-
214 AM PDT Sun Sep 13 2026

...RED FLAG WARNING HAS EXPIRED...

The strongest winds have diminished, thus ending the threat for
all of Lake County, California. Including, but not limited to; 
Lakeport, Clearlake, Kelseyville, Upper Lake, Cobb, Middletown, 
and Lower Lake. Less gusty winds (below red flag criteria) are 
still expected this afternoon/evening.

$$


http://weather.gov/eureka

The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 10, 9:18 PM PDT	Fire Weather Watch	EKA	Lake	13 hr

Nearby

Red Flag Warnings in California, 2026 Every red flag warning in 2026

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.