Alert archive / Texas / Red Flag Warnings in 2009

Red Flag Warning 21, NWS Norman, OK

April 1, 20098 counties in Texas; 7 counties in Oklahoma

NWS Norman, OK issued this red flag warning at Apr 1, 2009, 4:27 AM CDT for 8 counties in Texas; 7 counties in Oklahoma. It took effect at Apr 1, 2009, 1:00 PM CDT. It was in force for 6 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 1, 2009, 4:27 AM CDT (09:27 UTC)
In effect from
Apr 1, 2009, 1:00 PM CDT
Expired
Apr 1, 2009, 7:00 PM CDT
In force
6 hr
Issued by
NWS Norman, OK

Counties Beckham County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Roger Mills County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 26 km from the middle of the area, began a volume at 09:27 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

Norman, OK (KOUN), launched 00:00Z, 9.5 hours before the alert went out and 197 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, Norman, OK at 00:00Z on 2009-04-01Temperature 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 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2009-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939587897117Sfc1 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
3295 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
64 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.

000 
WWUS84 KOUN 010927
RFWOUN

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORMAN OK
427 AM CDT WED APR 1 2009

...STRONG WINDS AND VERY DRY AIR EXPECTED WEDNESDAY AFTERNOON...

.GUSTY SOUTH WINDS WILL DEVELOP TODAY AS A STRONG STORM SYSTEM
APPROACHES THE SOUTHERN PLAINS. THIS WIND COMBINED WITH WARM
WEATHER AND VERY DRY AIR IN WESTERN NORTH TEXAS AND SOUTHWEST
OKLAHOMA...WILDFIRE CONTAINMENT MAY BE DIFFICULT.

OKZ033-034-036-037-044-TXZ083>090-011730-
/O.UPG.KOUN.FW.A.0017.090401T1800Z-090402T0000Z/
/O.NEW.KOUN.FW.W.0021.090401T1800Z-090402T0000Z/
HARMON-GREER-JACKSON-TILLMAN-COTTON-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
427 AM CDT WED APR 1 2009

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM
CDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT
THIS EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. 

WIND SPEEDS FROM 20 TO 25 MPH...ALONG WITH GUSTS OVER 30 MPH...
ARE EXPECTED TO OCCUR THIS AFTERNOON. COMBINED WITH TEMPERATURES
IN THE UPPER 70S AND LOWER 80S AND AFTERNOON RELATIVE HUMIDITY
FROM 12 TO 20 PERCENT ACROSS WESTERN NORTH TEXAS AND SOUTHWEST
OKLAHOMA...THESE CONDITIONS WILL CREATE OPTIMAL CONDITIONS FOR
WILDFIRES TO SPREAD QUICKLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE FORECAST TO OCCUR. A COMBINATION OF STRONG WINDS...LOW
RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE
FIRE GROWTH POTENTIAL.

&&

$$

OKZ014-021-011730-
/O.NEW.KOUN.FW.W.0021.090401T1800Z-090402T0000Z/
ROGER MILLS-BECKHAM-
427 AM CDT WED APR 1 2009

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM
CDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT
THIS EVENING. 

WIND SPEEDS FROM 20 TO 25 MPH...ALONG WITH GUSTS OVER 30 MPH...
ARE EXPECTED TO OCCUR THIS AFTERNOON. COMBINED WITH TEMPERATURES
IN THE MID TO UPPER 70S AND AFTERNOON RELATIVE HUMIDITY FROM 15
TO 20 PERCENT ACROSS BECKHAM AND ROGER MILLS COUNTIES...THESE
CONDITIONS WILL CREATE OPTIMAL CONDITIONS FOR WILDFIRES TO SPREAD
QUICKLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE FORECAST TO OCCUR. A COMBINATION OF STRONG WINDS...LOW RELATIVE
HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH
POTENTIAL.

&&

$$

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 10:52 AM CDTWind AdvisoryOUNArcher, Clay, Wichita8 hr

Nearby

Red Flag Warnings in Texas, 2009Red Flag Warnings in Oklahoma, 2009Every red flag warning in 2009

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.