Alert archive / Texas / Red Flag Warnings in 2009
Red Flag Warning 21, NWS Norman, OK
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 10:52 AM CDT | Wind Advisory | OUN | Archer, Clay, Wichita | 8 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.