Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 593, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 28, 2009, 9:37 PM CDT for Cleveland County, Oklahoma County, Pottawatomie County, Oklahoma. It was in force for 31 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
- Jul 28, 2009, 9:37 PM CDT (02:37 UTC)
- Expired
- Jul 28, 2009, 10:08 PM CDT
- In force
- 31 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Cleveland County, OK, Oklahoma County, OK, Pottawatomie County, OK
The radar
The Norman radar (KTLX), 5 km from the middle of the area, began a volume at 02:40 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, 2.6 hours before the alert went out and 19 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
- 553 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1736 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Jul 28, 6:02 PM CDT, 3 hours 35 minutes earlier.
Area forecast discussion, Jul 28, 6:02 PM CDT, 3 hours 35 minutes before
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</html>Hazardous weather outlook, Jul 28, 4:30 PM CDT, 5 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
430 PM CDT TUE JUL 28 2009
OKZ004>048-050>052-TXZ083>090-291000-
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-
430 PM CDT TUE JUL 28 2009
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...THIS AFTERNOON AND TONIGHT...
THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH THIS EVENING
ACROSS WESTERN AND NORTHERN OKLAHOMA...AND FAR WESTERN NORTH TEXAS.
LOCATION...
THE SLIGHT RISK AREA IS WEST OF A LINE FROM BENJAMIN AND VERNON
TEXAS...TO SNYDER...TO EL RENO...GUTHRIE...AND STILLWATER.
TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE LATE AFTERNOON
THROUGH MIDNIGHT.
IMPACTS...
HAIL THE SIZE OF GOLFBALLS MAY DAMAGE CARS...ROOFS...AND TENDER
VEGETATION. WIND GUSTS TO 65 MPH MAY DAMAGE OUT-BUILDINGS AND
TREES...AND ALSO TOPPLE POWER POLES.
RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH THIS
EVENING.
DISCUSSION...
SCATTERED THUNDERSTORMS NEAR A WEAK COLD FRONT ACROSS NORTH-CENTRAL
OKLAHOMA AND SOUTHERN KANSAS WILL POSE A THREAT OF LARGE HAIL AND
DAMAGING WINDS AS THEY MOVE SOUTHEAST LATE THIS AFTERNOON AND
EVENING. ADDITIONAL STORMS OVER THE TEXAS AND OKLAHOMA PANHANDLES
MAY APPROACH WESTERN PORTIONS OF OKLAHOMA THIS EVENING AND ALSO POSE
A THREAT OF LARGE HAIL AND DAMAGING WIND GUSTS.
INSTABILITY AND VERTICAL WIND SHEAR WILL BE SUFFICIENT TO SUPPORT
ORGANIZED SEVERE THUNDERSTORMS THROUGH THIS EVENING WITH DAMAGING
WINDS AND LARGE HAIL BEING THE MAIN CONCERNS. BY MIDNIGHT...
INSTABILITY IS EXPECTED TO DECREASE ENOUGH TO PRECLUDE ORGANIZED
SEVERE STORMS OVERNIGHT.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY JUL 29.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.
OTHER HAZARDOUS WEATHER...
NONE.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
THUNDERSTORM OUTLOOK...
NORTHWEST FLOW ALOFT WILL PERSIST ACROSS THE REGION INTO THE
WEEKEND. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE
WEDNESDAY INTO WEDNESDAY NIGHT OVER ALL OF OKLAHOMA AND MOST OF
WESTERN NORTH TEXAS. LARGE HAIL... DAMAGING WINDS... AND HEAVY
RAINFALL WILL BE POSSIBLE AS ANOTHER THUNDERSTORM COMPLEX MOVES
SOUTHEAST OVER THE REGION. A RISK OF ISOLATED SEVERE THUNDERSTORMS
WILL CONTINUE INTO THURSDAY OVER WESTERN NORTH TEXAS AND THE
SOUTHEAST HALF OF OKLAHOMA.
OTHER HAZARDOUS WEATHER...
NONE.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
WEDNESDAY.In the hours before
Special weather statement, Jul 28, 8:11 PM CDT, 1 hour 26 minutes before
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</html>Local storm report, Jul 28, 8:17 PM CDT, 1 hour 20 minutes before
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</html>Local storm report, Jul 28, 8:28 PM CDT, 1 hour 9 minutes before
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</html>Special weather statement, Jul 28, 8:32 PM CDT, 1 hour 5 minutes before
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</html>Local storm report, Jul 28, 9:31 PM CDT, 6 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 7:37 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Noble, Payne | 53 min |
| Jul 28, 7:46 PM CDT | Areal Flood Advisory | OUN | Payne | 119 min |
| Jul 28, 8:49 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Lincoln, Oklahoma, Pottawatomie | 56 min |
| Jul 28, 10:19 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, McClain | 56 min |
| Jul 29, 3:19 AM CDT | Areal Flood Advisory | OUN | Archer | 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.