Alert archive / Colorado / Red Flag Warnings in 2012

Red Flag Warning 9, NWS Denver/Boulder, CO

April 7, 20125 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Apr 7, 2012, 1:49 AM MDT for 5 counties in Colorado. It took effect at Apr 7, 2012, 10:00 AM MDT. It was in force for 5 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
Apr 7, 2012, 1:49 AM MDT (07:49 UTC)
In effect from
Apr 7, 2012, 10:00 AM MDT
Expired
Apr 7, 2012, 3:18 PM MDT
In force
5 hr
Issued by
NWS Denver/Boulder, CO

Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 150 km from the middle of the area, began a volume at 07:51 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 00:00Z, 7.8 hours before the alert went out and 76 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 00:00Z on 2012-04-07Temperature 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 00:00Z on 2012-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 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
5117 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
91 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.

388 
WWUS85 KBOU 070749
RFWBOU

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
149 AM MDT SAT APR 7 2012

COZ242-248>251-071800-
/O.NEW.KBOU.FW.W.0009.120407T1600Z-120407T2200Z/
NORTHEAST WELD COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-
SEDGWICK COUNTY-PHILLIPS COUNTY-
149 AM MDT SAT APR 7 2012

...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 4 PM MDT
THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE 
NORTHEASTERN CORNER OF COLORADO...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A RED FLAG
WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY...WHICH IS IN
EFFECT FROM 10 AM THIS MORNING TO 4 PM MDT THIS AFTERNOON.

* AFFECTED AREA...FIRE WEATHER ZONES 242...248...249...250 AND 
  251.

* TIMING...NORTHWEST WINDS WILL INCREASE AGAIN BY MID MORNING AND
  REMAIN GUSTY INTO EARLY AFTERNOON. THE WINDS WILL THEN
  GRADUALLY DECREASE DURING THE MID AND LATE AFTERNOON HOURS.

* WINDS...NORTHWEST 20 TO 25 MPH WITH GUSTS AROUND 35 MPH.

* RELATIVE HUMIDITY...AS LOW AS 9 PERCENT.

* IMPACTS...THE GUSTY WINDS AND VERY LOW HUMIDITY WILL ALLOW RAPID
  SPREAD OF ANY GRASSLAND WILDFIRES.

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
021 
WWUS85 KBOU 072118
RFWBOU

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
318 PM MDT SAT APR 7 2012

COZ242-248>251-072230-
/O.CAN.KBOU.FW.W.0009.000000T0000Z-120407T2200Z/
NORTHEAST WELD COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-
SEDGWICK COUNTY-PHILLIPS COUNTY-
318 PM MDT SAT APR 7 2012

...RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY FOR ZONES
242...248...249...250...251 IS CANCELLED.

THE NATIONAL WEATHER SERVICE IN DENVER HAS CANCELLED THE RED FLAG
WARNING.

WINDS OVER THE NORTHEAST CORNER OF COLORADO HAVE DECREASED AND
WILL CONTINUE TO DECREASE THROUGH THE REMAINDER OF THE AFTERNOON.
RELATIVE HUMIDITIES STILL REMAIN BELOW 20 PERCENT IN MANY PLACES
SO ELEVATED FIRE DANGER WILL CONTINUE UNTIL TEMPERATURES COOL
DURING THE EVENING.

$$

Nearby

Red Flag Warnings in Colorado, 2012Every 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.