Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 302, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at May 6, 2009, 2:49 AM CDT for Garvin County, Murray County, Oklahoma. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 6, 2009, 2:49 AM CDT (07:49 UTC)
- Expired
- May 6, 2009, 3:30 AM CDT
- In force
- 41 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Garvin County, OK, Murray County, OK
The radar
The Norman radar (KTLX), 83 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 5, 11:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 7.8 hours before the alert went out and 72 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
- 2 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 466 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 375 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 5, 11:53 PM CDT, 2 hours 56 minutes earlier.
Area forecast discussion, May 5, 11:53 PM CDT, 2 hours 56 minutes before
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</html>Hazardous weather outlook, May 5, 9:30 PM CDT, 5 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
930 PM CDT TUE MAY 5 2009
OKZ004>048-050>052-TXZ083>090-061000-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
930 PM CDT TUE MAY 5 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...TONIGHT...
THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHERN
OKLAHOMA AND PARTS OF WESTERN NORTH TEXAS.
LOCATION...
THE SLIGHT RISK AREA IS SOUTH AND EAST OF A HOLDENVILLE...TO PAULS
VALLEY...TO DUNCAN... TO WICHITA FALLS...TO SEYMOUR LINE.
TIMING...
THUNDERSTORMS ARE EXPECTED TO BECOME NUMEROUS ACROSS SOUTHERN
OKLAHOMA AND NORTH TEXAS LATE TONIGHT. THE MOST LIKELY TIME FOR
SEVERE WEATHER WILL BE AFTER MIDNIGHT.
IMPACTS...
HAIL TO 2 INCHES IN DIAMETER AND WIND GUSTS TO 70 MPH WILL BE
POSSIBLE. ISOLATED TORNADOES WILL ALSO BE POSSIBLE IN FAR SOUTHERN
OKLAHOMA NEAR THE WARM FRONTAL BOUNDARY.
RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREAS SHOULD BE PREPARED FOR SEVERE WEATHER OPERATIONS
OVERNIGHT.
DISCUSSION...
THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE OVERNIGHT AS A
SOUTHWESTERLY LOW LEVEL JET INTENSIFIES AND INTERACTS WITH A WARM
FRONT JUST SOUTH OF THE RED RIVER. INSTABILITY AND SHEAR WILL BE
FAVORABLE FOR SEVERE THUNDERSTORMS ACROSS PARTS OF SOUTHERN OKLAHOMA
AND WESTERN NORTH TEXAS. DAMAGING WIND AND LARGE HAIL WILL BE THE
MAIN THREATS...WITH A CHANCE FOR TORNADOES IN FAR SOUTHERN OKLAHOMA
CLOSEST TO THE FRONT. IN ADDITION TO THE THREAT OF SEVERE
WEATHER...FLOODING RAINS WILL ALSO BE POSSIBLE WITH THESE STORMS.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY MAY 6.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...70 PERCENT.
OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL HAS LEFT THE GROUND SATURATED ACROSS MUCH OF THE
AREA. ADDITIONAL HEAVY RAINFALL WILL RESULT IN RAPID RUNOFF AND
POSSIBLE FLASH FLOODING. A FLASH FLOOD WATCH IS IN EFFECT. PLEASE
REFER TO THE LATEST VERSION OF THIS PRODUCT FOR MORE INFORMATION.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS ARE EXPECTED TO EXIT SOUTHEAST PORTIONS OF OKLAHOMA
EARLY WEDNESDAY MORNING. AT LEAST SMALL CHANCES FOR THUNDERSTORMS
WILL OCCUR EACH DAY THROUGH NEXT WEEKEND... WITH SEVERE STORMS
POSSIBLE.
OTHER HAZARDOUS WEATHER...
WITH EACH EPISODE OF RAINFALL THROUGH THE FORECAST PERIOD... MOST OF
THE RAIN WILL RESULT IN RAPID RUNOFF AND POSSIBLE FLOODING. MAINSTEM
RIVER FLOODING MAY ALSO OCCUR WITH REPEATED RAINFALL.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
WEDNESDAY MORNING.
CJS/IIIn the hours before
Special weather statement, May 6, 2:27 AM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 227 AM CDT WED MAY 6 2009 OKZ039>041-046-060800- MURRAY OK-GARVIN OK-CARTER OK-STEPHENS OK- 227 AM CDT WED MAY 6 2009 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...GARVIN...MURRAY AND STEPHENS COUNTIES. A STRONG THUNDERSTORM WAS LOCATED OVER PERNELL AT 227 AM CDT...MOVING EAST AT 20 MPH. ANOTHER STORM WAS JUST NORTHEAST OF TURNER FALLS. THESE STORMS WILL PRODUCE HEAVY RAIN... AND SMALL HAIL. STORM INTENSITY WAS INCREASING... AND THESE STORMS MAY BECOME SEVERE. PEOPLE IN CARTER...GARVIN...MURRAY AND STEPHENS COUNTIES SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS. CMS
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 3:06 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Garvin, Grady, Stephens | 39 min |
| May 6, 3:24 AM CDT | Severe Thunderstorm Warning | OUN | Murray | 36 min |
| May 6, 3:27 AM CDT | Flash Flood Warning | OUN | Garvin, Grady, Murray, Stephens | 5 hr |
| May 6, 3:40 AM CDT | Severe Thunderstorm Warning | OUN | Cotton | 65 min |
| May 6, 3:57 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Johnston, Murray | 48 min |
| May 6, 4:27 AM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan, Carter, Johnston, Love, Marshall | 63 min |
| May 6, 4:45 AM CDT | Severe Thunderstorm Warning | OUN | Love | 45 min |
| May 6, 4:59 AM CDT | Areal Flood Advisory | OUN | Atoka, Bryan, Carter, Johnston, Love, Marshall | 3 hr |
| May 6, 5:11 AM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan | 49 min |
| May 6, 8:49 AM CDT | River Flood Warning | OUN | Atoka, Bryan | 23 hr |
| May 6, 9:10 AM CDT | Areal Flood Advisory | OUN | Garvin, Murray | 3 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm 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.