Alert archive / Colorado / Red Flag Warnings in 2011

Red Flag Warning 24, NWS Denver/Boulder, CO

September 26, 20117 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Sep 26, 2011, 10:45 AM MDT for 7 counties in Colorado. It took effect at Sep 26, 2011, 12:00 PM MDT. It was in force for 7 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 26, 2011, 10:45 AM MDT (16:45 UTC)
In effect from
Sep 26, 2011, 12:00 PM MDT
Expired
Sep 26, 2011, 7:00 PM MDT
In force
7 hr
Issued by
NWS Denver/Boulder, CO

Counties Adams County, CO, Arapahoe County, CO, Elbert County, CO, Larimer County, CO, Lincoln County, CO, Morgan County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 26 km from the middle of the area, began a volume at 16:45 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

Denver, CO (KDNR), launched 12:00Z, 4.8 hours before the alert went out and 90 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, Denver, CO at 12:00Z on 2011-09-26Temperature 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 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2011-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 square meters per square second.1939Sfc1 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
3533 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
-34 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.

122 
WWUS85 KBOU 261645
RFWBOU

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
1045 AM MDT MON SEP 26 2011

...UNSEASONABLY WARM AND DRY CONDITIONS ALONG WITH BREEZY NORTH
WINDS WILL BRING HIGH FIRE DANGER TODAY...

.AN INCREASE IN NORTHERLY FLOW WILL BRING BREEZY NORTH WINDS TO
PORTIONS OF NORTHEAST COLORADO THIS AFTERNOON. THE STRONGEST WINDS
OF 15-20 MPH WITH GUSTS TO 25 TO 30 MPH WILL OCCUR FROM LARIMER
AND WELD COUNTIES SOUTHWARD THROUGH THE FORT MORGAN...BYERS...AND
LIMON AREA. TEMPERATURES WILL BE UNSEASONABLY WARM WITH VERY LOW
HUMIDITY READINGS. FUELS ARE QUITE DRY AS WELL...ESPECIALLY
GRASS. ANY NEW FIRE STARTS COULD SPREAD RAPIDLY THIS AFTERNOON DUE
TO THE DRY CONDITIONS.

COZ238-242>246-270045-
/O.NEW.KBOU.FW.W.0024.110926T1800Z-110927T0100Z/
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-
1045 AM MDT MON SEP 26 2011

...RED FLAG WARNING IN EFFECT UNTIL 7 PM MDT THIS EVENING FOR
WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF NORTHEAST COLORADO...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A RED FLAG
WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT
UNTIL 7 PM MDT THIS EVENING. 

* AFFECTED AREA...FIRE WEATHER ZONES 238...242...243...244... 
  245 AND 246.

* TIMING...NOON UNTIL 1900 MDT.

* WINDS...NORTH 15 TO 20 MPH WITH GUSTS UP TO 30 MPH.

* RELATIVE HUMIDITY...NEAR 10 PERCENT.

* IMPACTS...THE VERY DRY CONDITIONS AND GUSTY WINDS COULD LEAD TO
  RAPID GROWTH OF NEW FIRE STARTS ESPECIALLY IN THIS SEASONS WELL
  CURED GRASS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE
OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING.

&&

$$

BARJENBRUCH
1 follow-up statement
283 
WWUS85 KBOU 270101
RFWBOU

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
701 PM MDT MON SEP 26 2011


COZ238-242>246-270215-
/O.EXP.KBOU.FW.W.0024.000000T0000Z-110927T0100Z/
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-
701 PM MDT MON SEP 26 2011

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY...

THE RED FLAG WARNING IS NO LONGER IN EFFECT. 



$$

Nearby

Red Flag Warnings in Colorado, 2011Every red flag warning in 2011

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.