Alert archive / Oklahoma / Red Flag Warnings in 2011

Red Flag Warning 49, NWS Norman, OK

September 1, 201113 counties in Oklahoma

NWS Norman, OK issued this red flag warning at Sep 1, 2011, 4:13 AM CDT for 13 counties in Oklahoma. It took effect at Sep 1, 2011, 12:00 PM CDT. It was in force for 9 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 1, 2011, 4:13 AM CDT (09:13 UTC)
In effect from: Sep 1, 2011, 12:00 PM CDT
Expired: Sep 1, 2011, 9:00 PM CDT
In force: 9 hr
Issued by: NWS Norman, OK

Counties Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Grant County, OK, Harper County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 103 km from the middle of the area, began a volume at 09:11 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

Lamont, OK (KLMN), launched 00:00Z, 9.2 hours before the alert went out and 146 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: 87 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 3538 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 62 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.

916 
WWUS84 KOUN 010913
RFWOUN

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORMAN OK
413 AM CDT THU SEP 1 2011

OKZ004>006-009>011-014>017-011715-
/O.UPG.KOUN.FW.A.0050.110901T1700Z-110902T0100Z/
/O.NEW.KOUN.FW.W.0049.110901T1700Z-110902T0200Z/
HARPER-WOODS-ALFALFA-ELLIS-WOODWARD-MAJOR-ROGER MILLS-DEWEY-
CUSTER-BLAINE-
413 AM CDT THU SEP 1 2011

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM CDT THIS
EVENING FOR HOT.. DRY AND WINDY CONDITIONS FOR PORTIONS
OF NORTHERN AND WESTERN OKLAHOMA...

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM NOON TODAY TO 9 PM CDT THIS
EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. 

* WIND...SOUTH TO SOUTHWEST WINDS 20 TO 25 MPH WITH GUSTS OVER 30
  MPH.

* HUMIDITY...15 TO 20 PERCENT.

* TEMPERATURE...100 TO 107 DEGREES.

* THE ONGOING DROUGHT HAS CREATED EXCEPTIONALLY DRY GROUND AND 
  VEGETATION CONDITIONS FOR THIS TIME OF YEAR ACROSS THE 
  REGION. THESE CONDITIONS WILL FURTHER ENHANCE THE RISK OF 
  WILDFIRES. 

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FIRES MAY START EASILY AND SPREAD RAPIDLY. REPORT SMOKE OR FIRE
TO YOUR LOCAL FIRE DEPARTMENT.

&&

$$

OKZ007-021-022-011715-
/O.NEW.KOUN.FW.W.0049.110901T1700Z-110902T0200Z/
GRANT-BECKHAM-WASHITA-
413 AM CDT THU SEP 1 2011

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM CDT THIS
EVENING FOR HOT... DRY AND WINDY CONDITIONS FOR PORTIONS OF
NORTHERN AND WESTERN OKLAHOMA...

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM NOON TODAY TO 9 PM CDT THIS
EVENING. 

* WIND...SOUTH TO SOUTHWEST WINDS 20 TO 25 MPH WITH GUSTS OVER 30
  MPH.

* HUMIDITY...15 TO 20 PERCENT.

* TEMPERATURE...100 TO 107 DEGREES.

* THE ONGOING DROUGHT HAS CREATED EXCEPTIONALLY DRY GROUND AND 
  VEGETATION CONDITIONS FOR THIS TIME OF YEAR ACROSS THE 
  REGION. THESE CONDITIONS WILL FURTHER ENHANCE THE RISK OF 
  WILDFIRES. 

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FIRES MAY START EASILY AND SPREAD RAPIDLY. REPORT SMOKE OR FIRE
TO YOUR LOCAL FIRE DEPARTMENT.

&&

$$

1 follow-up statement

764 
WWUS84 KOUN 012029
RFWOUN

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORMAN OK
329 PM CDT THU SEP 1 2011

OKZ004>007-009>011-014>017-021-022-020200-
/O.CON.KOUN.FW.W.0049.000000T0000Z-110902T0200Z/
HARPER-WOODS-ALFALFA-GRANT-ELLIS-WOODWARD-MAJOR-ROGER MILLS-DEWEY-
CUSTER-BLAINE-BECKHAM-WASHITA-
329 PM CDT THU SEP 1 2011

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING...

* WIND...SOUTH TO SOUTHWEST WINDS 15 TO 25 MPH WITH GUSTS TO 30
  MPH.

* HUMIDITY...15 TO 20 PERCENT.

* TEMPERATURE...101 TO 107 DEGREES.

* THE ONGOING DROUGHT HAS CREATED EXCEPTIONALLY DRY GROUND AND 
  VEGETATION CONDITIONS FOR THIS TIME OF YEAR ACROSS THE 
  REGION. THESE CONDITIONS WILL FURTHER ENHANCE THE RISK OF 
  WILDFIRES. 

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FIRES MAY START EASILY AND SPREAD RAPIDLY. REPORT SMOKE OR FIRE
TO YOUR LOCAL FIRE DEPARTMENT.

&&

$$

Nearby

Red Flag Warnings in Oklahoma, 2011 Every 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.