Alert archive / California / Red Flag Warnings in 2012

Red Flag Warning 7, NWS San Diego, CA

December 8, 20124 counties in California

NWS San Diego, CA issued this red flag warning at Dec 8, 2012, 1:35 PM PST for 4 counties in California. It took effect at Dec 9, 2012, 6:00 PM PST. It was in force for 10 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: Dec 8, 2012, 1:35 PM PST (21:35 UTC)
In effect from: Dec 9, 2012, 6:00 PM PST
Expired: Dec 10, 2012, 3:45 AM PST
In force: 10 hr
Issued by: NWS San Diego, CA

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 21:36 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

San Diego, CA (KNKX), launched 12:00Z, 9.6 hours before the alert went out and 124 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: 1598 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

969 
WWUS86 KSGX 082135
RFWSGX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
135 PM PST SAT DEC 8 2012

...RED FLAG WARNING FOR SUNDAY THROUGH TUESDAY FOR THE MOUNTAINS...
THE VALLEYS...AND INLAND ORANGE COUNTY FOR STRONG GUSTY NORTHEAST
WINDS AND LOW RELATIVE HUMIDITIES...

.SURFACE HIGH PRESSURE OVER THE GREAT BASIN WILL COMBINE WITH A
TROUGH OF LOW PRESSURE OVER THE CENTRAL AND SOUTHERN ROCKIES TO
BRING STRONG AND GUSTY NORTHEAST TO EAST WINDS THROUGH AND BELOW
PASSES AND CANYONS FOR SUNDAY THROUGH TUESDAY. LOW RELATIVE
HUMIDITIES WILL DEVELOP OVER INLAND AREAS...WITH POOR TO MODERATE
RECOVERIES.

CAZ242-248-255-257-091300-
/O.UPG.KSGX.FW.A.0006.121209T1800Z-121211T0200Z/
/O.NEW.KSGX.FW.W.0007.121209T2200Z-121211T2200Z/
ORANGE COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN BERNARDINO COUNTY MOUNTAINS-
INCLUDING THE MOUNTAIN TOP AND FRONT COUNTRY RANGER DISTRICTS OF
THE SAN BERNARDINO NATIONAL FOREST-SANTA ANA MOUNTAINS-
INCLUDING THE TRABUCO RANGER DISTRICT OF THE CLEVELAND NATIONAL
FOREST-
135 PM PST SAT DEC 8 2012

...RED FLAG WARNING IN EFFECT FROM 2 PM SUNDAY TO 2 PM PST
TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A RED FLAG
WARNING FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...WHICH IS IN
EFFECT FROM 2 PM SUNDAY TO 2 PM PST TUESDAY. THE FIRE WEATHER
WATCH IS NO LONGER IN EFFECT. 

* WINDS...NORTHEAST 20 TO 30 MPH...WITH GUSTS TO 50 MPH. LOCAL
  GUSTS UP TO 60 MPH THROUGH AND BELOW THE FAVORED PASSES AND
  CANYONS FOR SUNDAY NIGHT AND MONDAY MORNING. WIND WILL DECREASE
  MONDAY AFTERNOON AND TUESDAY TO 15 TO 25 MPH...WITH GUSTS UP TO
  40 MPH. LOCAL GUSTS UP TO 50 MPH THROUGH AND BELOW THE FAVORED
  PASSES AND CANYONS MONDAY NIGHT AND TUESDAY MORNING.

* RELATIVE HUMIDITY...DAYTIME HUMIDITY VALUES WILL RANGE BETWEEN
  10 AND 15 PERCENT...WITH SINGLE DIGITS POSSIBLE
  LOCALLY...ESPECIALLY ON TUESDAY. POOR OVERNIGHT RECOVERY WILL
  DEVELOP.

* TIMING...WINDS WILL INCREASE SUNDAY AFTERNOON...AS HUMIDITY
  VALUES FALL. HOWEVER...THE STRONGEST WINDS WILL OCCUR SUNDAY
  NIGHT AND MONDAY MORNING...AND THEN AGAIN MONDAY NIGHT INTO
  TUESDAY MORNING.

* OUTLOOK...WINDS WILL SHIFT TO ONSHORE ON WEDNESDAY...AS A TROUGH
  OF LOW PRESSURE BRINGS COOLER CONDITIONS AS WELL AS A CHANCE OF
  PRECIPITATION WEDNESDAY NIGHT AND THURSDAY.

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

CAZ250-256-258-091300-
/O.UPG.KSGX.FW.A.0006.121210T0000Z-121211T0200Z/
/O.NEW.KSGX.FW.W.0007.121210T0200Z-121211T2200Z/
SAN DIEGO COUNTY INLAND VALLEYS-RIVERSIDE COUNTY MOUNTAINS-
INCLUDING THE SAN JACINTO RANGER DISTRICT OF THE SAN BERNARDINO
NATIONAL FOREST-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE PALOMAR AND DESCANSO RANGER DISTRICTS OF THE
CLEVELAND NATIONAL FOREST-
135 PM PST SAT DEC 8 2012

...RED FLAG WARNING IN EFFECT FROM 6 PM SUNDAY TO 2 PM PST
TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A RED FLAG
WARNING FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...WHICH IS IN
EFFECT FROM 6 PM SUNDAY TO 2 PM PST TUESDAY. THE FIRE WEATHER
WATCH IS NO LONGER IN EFFECT. 

* WINDS...NORTHEAST 20 TO 30 MPH...WITH GUSTS TO 50 MPH. LOCAL
  GUSTS UP TO 60 MPH THROUGH AND BELOW THE FAVORED PASSES AND
  CANYONS FOR SUNDAY NIGHT AND MONDAY MORNING. WIND WILL DECREASE
  MONDAY AFTERNOON AND TUESDAY TO 15 TO 25 MPH...WITH GUSTS UP TO
  40 MPH. LOCAL GUSTS UP TO 50 MPH THROUGH AND BELOW THE FAVORED
  PASSES AND CANYONS MONDAY NIGHT AND TUESDAY MORNING.

* RELATIVE HUMIDITY...DAYTIME HUMIDITY VALUES WILL RANGE BETWEEN
  10 AND 15 PERCENT...WITH SINGLE DIGITS POSSIBLE
  LOCALLY...ESPECIALLY ON TUESDAY. POOR OVERNIGHT RECOVERY WILL
  DEVELOP.

* TIMING...WINDS WILL INCREASE SUNDAY EVENING. HOWEVER...THE
  STRONGEST WINDS WILL OCCUR SUNDAY NIGHT AND MONDAY MORNING...AND
  THEN AGAIN MONDAY NIGHT INTO TUESDAY MORNING.

* OUTLOOK...WINDS WILL SHIFT TO ONSHORE ON WEDNESDAY...AS A TROUGH
  OF LOW PRESSURE BRINGS COOLER CONDITIONS AS WELL AS A CHANCE OF
  PRECIPITATION WEDNESDAY NIGHT AND THURSDAY.

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/SANDIEG0

PALMER

3 follow-up statements

341 
WWUS86 KSGX 091137
RFWSGX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
337 AM PST SUN DEC 9 2012

...RED FLAG WARNING FOR THE MOUNTAINS AND INLAND VALLEYS FOR
MONDAY...FOR STRONG GUSTY NORTHEAST WINDS AND LOW RELATIVE
HUMIDITIES...

.SURFACE HIGH PRESSURE OVER THE GREAT BASIN WILL BRING PERIODS OF
GUSTY NORTHEAST WINDS THROUGH TUESDAY FOR AREAS THROUGH AND BELOW
PASSES AND CANYONS WITH LOWER HUMIDITIES FOR INLAND AREAS. WINDS
ARE EXPECTED TO BE STRONGEST TONIGHT THROUGH MONDAY MORNING WITH
STRONGEST GUSTS TO AROUND 50 MPH. HUMIDITIES ARE EXPECTED TO BE
LOWEST FOR MID MORNING THROUGH LATE AFTERNOON MONDAY. SLIGHT
RECOVERY OF HUMIDITIES FOR TUESDAY WITH GREATER RECOVERY FOR
WEDNESDAY.

CAZ242-248-250-255>258-092230-
/O.EXT.KSGX.FW.W.0007.121210T1800Z-121211T0000Z/
ORANGE COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY INLAND VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
INCLUDING THE MOUNTAIN TOP AND FRONT COUNTRY RANGER DISTRICTS OF
THE SAN BERNARDINO NATIONAL FOREST-RIVERSIDE COUNTY MOUNTAINS-
INCLUDING THE SAN JACINTO RANGER DISTRICT OF THE SAN BERNARDINO
NATIONAL FOREST-SANTA ANA MOUNTAINS-
INCLUDING THE TRABUCO RANGER DISTRICT OF THE CLEVELAND NATIONAL
FOREST-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE PALOMAR AND DESCANSO RANGER DISTRICTS OF THE
CLEVELAND NATIONAL FOREST-
337 AM PST SUN DEC 9 2012

...RED FLAG WARNING NOW IN EFFECT FROM 10 AM TO 4 PM PST MONDAY
FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...

THE RED FLAG WARNING IS NOW IN EFFECT FROM 10 AM TO 4 PM PST
MONDAY. 

* WINDS...NORTHEAST 15 TO 25 MPH WITH GUSTS TO 45 MPH.

* RELATIVE HUMIDITY...10 TO 15 PERCENT.

* OUTLOOK...LOCALLY GUSTY NORTHEAST WINDS TO 35 MPH WILL CONTINUE
  NEAR THE COASTAL FOOTHILLS INTO TUESDAY WITH MODEST RECOVERY OF 
  HUMIDITIES FOR INLAND AREAS.

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/SANDIEG0

17

874 
WWUS86 KSGX 092120
RFWSGX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
120 PM PST SUN DEC 9 2012

...RED FLAG WARNING FOR THE MOUNTAINS AND INLAND VALLEYS FOR
TONIGHT AND MONDAY...FOR STRONG GUSTY NORTHEAST WINDS AND LOW
RELATIVE HUMIDITIES...

.SURFACE HIGH PRESSURE OVER THE GREAT BASIN WILL BRING PERIODS OF
GUSTY NORTHEAST WINDS THROUGH TUESDAY FOR AREAS THROUGH AND BELOW
PASSES AND CANYONS AS WELL AS LOWER HUMIDITIES FOR INLAND AREAS.
WINDS WILL BE THE STRONGEST TONIGHT THROUGH MONDAY MORNING...WITH
STRONGEST GUSTS TO AROUND 50 MPH. WIDESPREAD MODERATE TO POOR
RECOVERIES WILL DEVELOP TONIGHT...WITH HUMIDITY VALUES FALLING
RAPIDLY ON MONDAY MORNING. MODERATE TO POOR RECOVERIES WILL
DEVELOP AGAIN TUESDAY NIGHT...BUT ONLY LOCALLY GUSTY CONDITIONS
WILL PREVAIL. 

CAZ242-248-250-255>258-101300-
/O.EXT.KSGX.FW.W.0007.121210T0200Z-121211T0000Z/
ORANGE COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY INLAND VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
INCLUDING THE MOUNTAIN TOP AND FRONT COUNTRY RANGER DISTRICTS OF
THE SAN BERNARDINO NATIONAL FOREST-RIVERSIDE COUNTY MOUNTAINS-
INCLUDING THE SAN JACINTO RANGER DISTRICT OF THE SAN BERNARDINO
NATIONAL FOREST-SANTA ANA MOUNTAINS-
INCLUDING THE TRABUCO RANGER DISTRICT OF THE CLEVELAND NATIONAL
FOREST-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE PALOMAR AND DESCANSO RANGER DISTRICTS OF THE
CLEVELAND NATIONAL FOREST-
120 PM PST SUN DEC 9 2012

...RED FLAG WARNING NOW IN EFFECT FROM 6 PM THIS EVENING TO 4 PM
PST MONDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...

THE RED FLAG WARNING IS NOW IN EFFECT FROM 6 PM THIS EVENING TO
4 PM PST MONDAY. 

* WINDS...NORTHEAST 15 TO 30 MPH...WITH GUSTS TO 45 MPH. LOCAL
  GUSTS UP 50 MPH WILL BE POSSIBLE THROUGH AND BELOW THE PASSES
  AND CANYONS.

* RELATIVE HUMIDITY...POOR TO MODERATE RECOVERIES
  TONIGHT...FALLING RAPIDLY TO AROUND 10 PERCENT ON MONDAY.

* OUTLOOK...LOCALLY GUSTY NORTHEAST WINDS TO 35 MPH WILL CONTINUE
  NEAR THE COASTAL FOOTHILLS INTO TUESDAY...WITH LOWER HUMIDITY
  VALUES PREVAILING.

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/SANDIEG0

PALMER

505 
WWUS86 KSGX 101145
RFWSGX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
345 AM PST MON DEC 10 2012

...RED FLAG WARNING FOR THE MOUNTAINS AND INLAND VALLEYS TODAY FOR 
STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITIES...

.WEAK TO MODERATE OFFSHORE FLOW WILL CONTINUE INTO THIS AFTERNOON 
WITH GUSTY NORTHEAST WINDS AND LOWER RELATIVE HUMIDITIES 
OCCASIONALLY MEETING RED FLAG CRITERIA FOR AREAS THROUGH AND BELOW 
PASSES AND CANYONS TODAY. SLOW RECOVERY OF HUMIDITIES FOR TONIGHT 
AND TUESDAY WITH LOCALLY GUSTY NORTHEAST WINDS NEAR THE COASTAL 
FOOTHILLS.

CAZ242-248-250-255>258-102200-
/O.CAN.KSGX.FW.W.0007.000000T0000Z-121211T0000Z/
/O.NEW.KSGX.FW.W.0008.121210T1600Z-121211T0000Z/
ORANGE COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY INLAND VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
INCLUDING THE MOUNTAIN TOP AND FRONT COUNTRY RANGER DISTRICTS OF
THE SAN BERNARDINO NATIONAL FOREST-RIVERSIDE COUNTY MOUNTAINS-
INCLUDING THE SAN JACINTO RANGER DISTRICT OF THE SAN BERNARDINO
NATIONAL FOREST-SANTA ANA MOUNTAINS-
INCLUDING THE TRABUCO RANGER DISTRICT OF THE CLEVELAND NATIONAL
FOREST-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE PALOMAR AND DESCANSO RANGER DISTRICTS OF THE
CLEVELAND NATIONAL FOREST-
345 AM PST MON DEC 10 2012

...RED FLAG WARNING IN EFFECT FROM 8 AM THIS MORNING TO 4 PM PST
THIS AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A RED FLAG
WARNING FOR STRONG GUSTY WINDS AND LOW HUMIDITIES...WHICH IS IN
EFFECT FROM 8 AM THIS MORNING TO 4 PM PST THIS AFTERNOON. 

* WINDS...NORTHEAST 15 TO 25 MPH WITH GUSTS TO 45 MPH.

* RELATIVE HUMIDITY...LOWEST AROUND 10 TO 15 PERCENT.

* LOCATION...THROUGH AND BELOW PASSES AND CANYONS AND NEAR COASTAL FOOTHILLS.

* OUTLOOK...LOCALLY GUSTY NORTHEAST WINDS TO 35 MPH WILL CONTINUE
  NEAR THE COASTAL FOOTHILLS INTO TUESDAY WITH POOR OVERNIGHT
  RECOVERY AND LOWEST DAYTIME HUMIDITIES TUESDAY AROUND 15 PERCENT.

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/SANDIEG0

17

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 8, 1:20 PM PST	Dense Fog Advisory	SGX	Riverside, San Bernardino, San Diego	21 hr
Dec 8, 1:20 PM PST	High Wind Warning	SGX	Orange, Riverside, San Bernardino, San Diego	14 hr

Nearby

Red Flag Warnings in California, 2012 Every red flag warning in 2012

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.