Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 117, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 11, 2001, 2:35 PM CDT for Cherokee County, Oklahoma. It was in force for 40 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- May 11, 2001, 2:35 PM CDT (19:35 UTC)
- Expired
- May 11, 2001, 3:15 PM CDT
- In force
- 40 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Cherokee County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 2:45 PM CDT | Hail 1 | Hulbert, OK | Quarter size hail fell at Sequoyah State Park. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 7.6 hours before the alert went out and 166 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
- 276 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 1033 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 236 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KTSA 111935 SVRTUL OKC021-112015- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 235 PM CDT FRI MAY 11 2001 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 315 PM CDT * AT 235 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES WEST OF HULBERT...MOVING SOUTHEAST AT 15 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...HULBERT. HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. LAT...LON 3605 9523 3595 9534 3583 9526 3584 9504
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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 11, 1:25 PM CDT, 1 hour 10 minutes earlier.
Area forecast discussion, May 11, 1:25 PM CDT, 1 hour 10 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 125 PM CDT FRI MAY 11 2001 UPDATING THE FORECAST TO UP POPS TO LIKELY OR BETTER IN THE NORTHWEST PART OF THE FORECAST AREA AND TO LOWER TEMPERATURES IN ARKANSAS FOR THE REST OF THE AFTERNOON. .TSA... AR...NONE. OK...NONE. PLATE
In the hours before
Local storm report, May 11, 12:06 PM CDT, 2 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1206 PM CDT FRI MAY 11 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1120 AM CENTERTON AR .75 INCH HAIL
05/11/01 BENTON REPORTED BY SHERIFFS
DEPT.Special weather statement, May 11, 1:00 PM CDT, 1 hour 35 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-121100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CDT FRI MAY 11 2001 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER PORTIONS OF EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS THIS AFTERNOON... EARLY THIS AFTERNOON...ONE AREA OF THUNDERSTORMS WAS PUSHING SLOWLY SOUTHWARD ACROSS NORTHWEST ARKANSAS AND EAST CENTRAL OKLAHOMA... WHILE A SECOND AREA OF THUNDERSTORMS WAS MOVING SOUTHWARD INTO NORTH CENTRAL OKLAHOMA. AT THE SURFACE...A COLD FRONT EXTENDED FROM NORTHWEST OKLAHOMA INTO WESTERN MISSOURI...WHILE AN OUTFLOW BOUNDARY EXTENDED EASTWARD ACROSS NORTH CENTRAL AND NORTHEAST OKLAHOMA AND THEN SOUTHEAST AHEAD OF THE STORMS IN NORTHWEST ARKANSAS. BOTH AREAS OF THUNDERSTORMS ARE EXPECTED TO CONTINUE MOVING SOUTH ACROSS EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS THROUGH THE AFTERNOON. WITH SOME AFTERNOON HEATING...THE ATMOSPHERE AHEAD OF THE STORMS WILL BECOME MORE UNSTABLE AND A FEW OF THE STORMS MAY BRIEFLY INTENSIFY TO SEVERE LEVELS. THE STRONGEST STORMS WILL PRODUCE HAIL UP TO ONE INCH IN DIAMETER AND VERY ISOLATED OUTFLOW WINDS UP TO 60 MPH. A POTENTIALLY MORE SIGNIFICANT THREAT COULD BE LOCALLY HEAVY RAINFALL...AS BETWEEN 1 AND 2 INCHES OF RAIN COULD FALL THIS AFTERNOON IN A FEW ISOLATED AREAS. THE SEVERE WEATHER THREAT WILL COME TO AN END FROM NORTH TO SOUTH ACROSS THE AREA AND SHOULD BE ENTIRELY OUT OF THE AREA THIS EVENING. .SPOTTER ACTIVATION... STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD MONITOR THE LATEST FORECASTS AND UPDATES...AND BE PREPARED FOR POSSIBLE ACTIVATION THIS AFTERNOON. .DISCUSSION... THUNDERSTORMS ARE EXPECTED TO CONTINUE TO DEVELOP IN THE VICINITY OF THE OUTFLOW BOUNDARY...LIKELY FORMING A LARGE BAND OF SHOWERS AND THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS BY 3 PM. DESPITE CAPE VALUES OVER 2000 J/KG IN THE AREA AHEAD OF THE BOUNDARY...A VERY WEAK WIND FIELD ALOFT AND THE LARGE NUMBER OF STORMS EXPECTED WILL LIKELY PREVENT THE DEVELOPMENT OF ANY ORGANIZED SEVERE STORMS THIS AFTERNOON. HOWEVER...A FEW EMBEDDED THUNDERSTORMS MAY BRIEFLY PULSE UP TO SEVERE LEVELS...BUT ANY SEVERE WEATHER EVENT WILL BE VERY SHORT-LIVED AND ISOLATED. GIVEN THE RELATIVELY SLOW MOTION OF THE AREA OF STORMS...SOME AREAS MAY RECEIVE UP TO 2 INCHES OF RAINFALL. ISOLATED RUNOFF PROBLEMS COULD RESULT. THREAT TABLE VALID THROUGH 1200 UTC SATURDAY THREAT AREA 1...SOUTHWEST OF A PONCA CITY TO TULSA TO FORT SMITH LINE. THUNDERSTORM PROBABILITY...90 SEVERE PROBABILITY IF STORMS OCCUR...20 SIGNIFICANT SEVERE PROBABILITY IF STORMS OCCUR...2 THREAT AREAS DEFINE THE GREATEST RISK. PROBABILITIES ARE IN PERCENT. SIGNIFICANT SEVERE IS DEFINED AS F1 OR GREATER WIND/TORNADO DAMAGE AND/OR GOLFBALL SIZE HAIL OR LARGER. A GRAPHICAL VERSION OF THIS OUTLOOK CAN BE FOUND AT: WWW.SRH.NOAA.GOV/TULSA
Special weather statement, May 11, 1:32 PM CDT, 1 hour 3 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-121100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 100 PM CDT FRI MAY 11 2001 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE OVER PORTIONS OF EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS THIS AFTERNOON... EARLY THIS AFTERNOON...ONE AREA OF THUNDERSTORMS WAS PUSHING SLOWLY SOUTHWARD ACROSS NORTHWEST ARKANSAS AND EAST CENTRAL OKLAHOMA... WHILE A SECOND AREA OF THUNDERSTORMS WAS MOVING SOUTHWARD INTO NORTH CENTRAL OKLAHOMA. AT THE SURFACE...A COLD FRONT EXTENDED FROM NORTHWEST OKLAHOMA INTO WESTERN MISSOURI...WHILE AN OUTFLOW BOUNDARY EXTENDED EASTWARD ACROSS NORTH CENTRAL AND NORTHEAST OKLAHOMA AND THEN SOUTHEAST AHEAD OF THE STORMS IN NORTHWEST ARKANSAS. BOTH AREAS OF THUNDERSTORMS ARE EXPECTED TO CONTINUE MOVING SOUTH ACROSS EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS THROUGH THE AFTERNOON. WITH SOME AFTERNOON HEATING...THE ATMOSPHERE AHEAD OF THE STORMS WILL BECOME MORE UNSTABLE AND A FEW OF THE STORMS MAY BRIEFLY INTENSIFY TO SEVERE LEVELS. THE STRONGEST STORMS WILL PRODUCE HAIL UP TO ONE INCH IN DIAMETER AND VERY ISOLATED OUTFLOW WINDS UP TO 60 MPH. A POTENTIALLY MORE SIGNIFICANT THREAT COULD BE LOCALLY HEAVY RAINFALL...AS BETWEEN 1 AND 2 INCHES OF RAIN COULD FALL THIS AFTERNOON IN A FEW ISOLATED AREAS. THE SEVERE WEATHER THREAT WILL COME TO AN END FROM NORTH TO SOUTH ACROSS THE AREA AND SHOULD BE ENTIRELY OUT OF THE AREA THIS EVENING. .SPOTTER ACTIVATION... STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD MONITOR THE LATEST FORECASTS AND UPDATES...AND BE PREPARED FOR POSSIBLE ACTIVATION THIS AFTERNOON. .DISCUSSION... THUNDERSTORMS ARE EXPECTED TO CONTINUE TO DEVELOP IN THE VICINITY OF THE OUTFLOW BOUNDARY...LIKELY FORMING A LARGE BAND OF SHOWERS AND THUNDERSTORMS ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS BY 3 PM. DESPITE CAPE VALUES OVER 2000 J/KG IN THE AREA AHEAD OF THE BOUNDARY...A VERY WEAK WIND FIELD ALOFT AND THE LARGE NUMBER OF STORMS EXPECTED WILL LIKELY PREVENT THE DEVELOPMENT OF ANY ORGANIZED SEVERE STORMS THIS AFTERNOON. HOWEVER...A FEW EMBEDDED THUNDERSTORMS MAY BRIEFLY PULSE UP TO SEVERE LEVELS...BUT ANY SEVERE WEATHER EVENT WILL BE VERY SHORT-LIVED AND ISOLATED. GIVEN THE RELATIVELY SLOW MOTION OF THE AREA OF STORMS...SOME AREAS MAY RECEIVE UP TO 2 INCHES OF RAINFALL. ISOLATED RUNOFF PROBLEMS COULD RESULT. THREAT TABLE VALID THROUGH 1200 UTC SATURDAY THREAT AREA 1...SOUTHWEST OF A PONCA CITY TO TULSA TO FORT SMITH LINE. THUNDERSTORM PROBABILITY...90 SEVERE PROBABILITY IF STORMS OCCUR...20 SIGNIFICANT SEVERE PROBABILITY IF STORMS OCCUR...2 THREAT AREAS DEFINE THE GREATEST RISK. PROBABILITIES ARE IN PERCENT. SIGNIFICANT SEVERE IS DEFINED AS F1 OR GREATER WIND/TORNADO DAMAGE AND/OR GOLFBALL SIZE HAIL OR LARGER. A GRAPH ICAL VERSION OF THIS OUTLOOK CAN BE FOUND AT: WWW.SRH.NOAA.GOV/TULSA
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 1:41 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Tulsa | 49 min |
| May 11, 3:19 PM CDT | Severe Thunderstorm Warning | TSA | Haskell | 41 min |
| May 11, 4:05 PM CDT | Severe Thunderstorm Warning | TSA | Okmulgee, Tulsa, Wagoner | 40 min |
| May 11, 4:31 PM CDT | Flash Flood Warning | TSA | Muskogee | 119 min |
| May 11, 4:45 PM CDT | Severe Thunderstorm Warning | TSA | Okmulgee | 30 min |
| May 11, 4:59 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 61 min |
| May 11, 5:20 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 40 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2001Every severe thunderstorm warning in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.