Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 142, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 2001, 6:12 PM CDT for Osage County, Oklahoma. It was in force for 48 min. 5 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 20, 2001, 6:12 PM CDT (23:12 UTC)
- Expired
- May 20, 2001, 7:00 PM CDT
- In force
- 48 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Osage County, OK
The radar
The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 23:16 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 6:30 PM CDT | Tornado F0 | Pawhuska, OK | A F0 tornado briefly touched down one mile south of Pawhuska. The tornado was video taped by a storm chaser. No damage was observed. |
| May 20, 6:39 PM CDT | Thunderstorm Wind 56 E | Pawhuska, OK | |
| May 20, 6:50 PM CDT | Thunderstorm Wind 52 E | Hominy, OK | |
| May 20, 6:50 PM CDT | Hail 0.75 | Hominy, OK | |
| May 20, 6:57 PM CDT | Thunderstorm Wind 52 E | Wynona, OK |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 5:00 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Lamont, OK (KLMN), launched 12:00Z, 11.2 hours before the alert went out and 97 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
- 186 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 769 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KTSA 202312 SVRTUL OKC113-210000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 612 PM CDT SUN MAY 20 2001 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA * UNTIL 700 PM CDT * AT 612 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 18 MILES SOUTH OF SKIATOOK...MOVING NORTH-NORTHEAST AT 35 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...SKIATOOK... BARNSDALL AND AVANT. HAIL TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO 65 MPH CAN BE EXPECTED IN THE WARNED AREA. THIS IS A DANGEROUS STORM. IF YOU ARE NEAR ITS PATHp YOU SHOULD PREPARE FOR VERY LARGE HAIL AND STRONG DAMAGING STRAIGHT LINE WINDS. SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS!
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 20, 5:40 PM CDT, 32 minutes earlier.
Area forecast discussion, May 20, 5:40 PM CDT, 32 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 540 PM CDT SUN MAY 20 2001 UPDATED FORECAST TO INCLUDE HEADLINE FOR SEVERE TSTORM WATCH NUMBER 256. STILL WAITING ON POSSIBLE TOR WATCH FOR WESTERN AR...WILL HAVE TO UPDATE AGAIN WHEN AND IF IT COMES OUT. INCREASED SEVERE THREAT WORDING IN SEVERAL ZONES GROUPS. NEW STORMS GOING UP AND INCREASING NOW...ONE IN EAST TULSA COUNTY AND THE ONE IN CREEK COUNTY. OTHER STORMS GOING UP IN HUGHES AND PONTOTOC COUNTIES COULD ALSO BECOME QUITE SEVERE AS IT TAPS EXTREME INSTABILITY. FCSTID = 26 .TSA... AR...NONE. OK...NONE.
In the hours before
Special weather statement, May 20, 1:05 PM CDT, 5 hours 7 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-211100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 105 PM CDT SUN MAY 20 2001 ...NUMEROUS SEVERE THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... AT MIDDAY...A LOW PRESSURE TROUGH EXTENDED SOUTH FROM A LOW PRESSURE SYSTEM LOCATED IN SOUTH CENTRAL NEBRASKA INTO THE TEXAS PANHANDLE. AN OUTFLOW BOUNDARY FROM THIS MORNINGS THUNDERSTORMS WAS LOCATED ACROSS SOUTHEAST OKLAHOMA. SOUTHERLY WINDS WERE INCREASING ACROSS THE AREA AHEAD OF THE TROUGH WHICH WILL HELP TO MOVE THE OUTFLOW BOUNDARY NORTHWARD THIS AFTERNOON. IN ADDITION...AN UPPER LEVEL DISTURBANCE CURRENTLY LOCATED IN NORTHWEST OKLAHOMA WILL CONTINUE TO MOVE EASTWARD INTO ARKANSAS BY TONIGHT. THIS UPPER SYSTEM IN CONJUNCTION WITH FAVORABLE UPPER LEVEL WINDS WILL COMBINE TO PRODUCE THUNDERSTORMS ACROSS NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS ALONG THE OUTFLOW BOUNDARY THIS AFTERNOON. THE THUNDERSTORMS SHOULD THEN EVOLVE INTO A LINE AND MOVE EAST INTO ARKANSAS BY TONIGHT. .SPOTTER ACTIVATION... SPOTTER ACTIVATION WILL LIKELY BE REQUIRED BEFORE 4 PM ACROSS PORTIONS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. .DISCUSSION... OUTFLOW BOUNDARY FROM THIS MORNINGS CONVECTIVE COMPLEX IS CURRENTLY POSITIONED ACROSS SOUTHEAST OKLAHOMA FROM NEAR IDABEL TO HUGO ON INTO SOUTH CENTRAL OKLAHOMA. DEWPOINTS SOUTH OF THE BOUNDARY ARE IN THE MID 70S WITH UPPER 60S TO NEAR 70 DEGREE DEWPOINTS NORTH OF THE BOUNDARY. LATEST FORECAST CAPE VALUES OF 3000 TO 4000 J/KG WILL BE IN PLACE ACROSS MUCH OF THE AREA THIS AFTERNOON INTO THE EVENING HOURS. SOUTHERLY WINDS ARE EXPECTED TO HELP MOVE THE OUTFLOW BOUNDARY FURTHER NORTH THIS AFTERNOON INTO EAST CENTRAL OKLAHOMA AROUND 4 PM. THIS BOUNDARY SHOULD PROVIDE THE FOCUS FOR THUNDERSTORM INITIATION. LARGE HAIL OF GOLFBALL SIZE OR LARGER WILL BE POSSIBLE WITH THESE STORMS. ISOLATED TORNADOES WILL ALSO BE A THREAT MAINLY ALONG THE OUTFLOW BOUNDARY THIS AFTERNOON AND EARLY EVENING BEFORE THE SYSTEM EVOLVES INTO LINE AND MOVES EAST INTO ARKANSAS. THREAT TABLE VALID THROUGH 1200 UTC MONDAY AREA 1...MUCH OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THUNDERSTORM PROBABILITY...95 SEVERE PROBABILITY IF STORMS OCCUR...90 SIGNIFICANT SEVERE PROBABILITY IF STORMS OCCUR...40 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. RELATED GRAPHICAL INFORMATION CAN BE FOUND AT: WWW.SRH.NOAA.GOV/TULSA AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND 1 PM TODAY.
Local storm report, May 20, 5:26 PM CDT, 46 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
526 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0450 PM 5 NW HANNA OK TORNADO
05/20/01 MCINTOSH DAMAGE REPORTED AT
INDIAN NATION TURNPIKE
TOLL BOOTH.
0522 PM e 2 S STIDHAM OK TORNADO
05/20/01 MCINTOSH SAME
TORNADO...CONTINUING ENELocal storm report, May 20, 5:30 PM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
530 CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0450 PM 5 NW HANNA OK TORNADO
05/20/01 MCINTOSH DAMAGE REPORTED AT
INDIAN NATION TURNPIKE
TOLL BOOTH.
0522 PM 2 S STIDHAM OK TORNADO
05/20/01 MCINTOSH SAME
TORNADO...CONTINUING ENELocal storm report, May 20, 5:52 PM CDT, 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
552 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0548 PM VIVIAN OK 1.75 INCH HAIL
05/20/01 MCINTOSH
0550 PM 2 N BROKEN ARROW OK 1 INCH HAIL
05/20/01 TULSALocal storm report, May 20, 6:08 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
608 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
K0548 PM VIVIAN OK 1.75 INCH HAIL
05/20/01 MCINTOSH
0550 PM 2 N BROKEN ARROW OK 1 INCH HAIL
05/20/01 TULSALocal storm report, May 20, 6:11 PM CDT, 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
611 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0556 PM 2 N FAIRFAX OK 1 INCH HAIL
05/20/01 OSAGE REPORTED BY POLICE DEPT
0607 PM SAND SPGS OK 1.75 INCH HAIL
05/20/01 TULSA AMATEUR RADIO REPORT
mThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 4:17 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 58 min |
| May 20, 4:24 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee | 51 min |
| May 20, 4:30 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 60 min |
| May 20, 4:31 PM CDT | Tornado Warning | TSA | McIntosh | 29 min |
| May 20, 4:56 PM CDT | Tornado Warning | TSA | McIntosh | 49 min |
| May 20, 5:14 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 61 min |
| May 20, 5:23 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 52 min |
| May 20, 5:32 PM CDT | Tornado Warning | TSA | Osage | 43 min |
| May 20, 5:45 PM CDT | Tornado Warning | TSA | McIntosh | 60 min |
| May 20, 5:46 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa | 44 min |
| May 20, 5:51 PM CDT | Severe Thunderstorm Warning | TSA | Rogers, Wagoner | 39 min |
| May 20, 6:02 PM CDT | Tornado Warning | TSA | Pittsburg | 58 min |
| May 20, 6:11 PM CDT | Tornado Warning | TSA | Haskell, Muskogee | 64 min |
| May 20, 6:13 PM CDT | Severe Thunderstorm Warning | TSA | Pawnee | 62 min |
| May 20, 6:16 PM CDT | Tornado Warning | TSA | Osage | 44 min |
| May 20, 6:33 PM CDT | Severe Thunderstorm Warning | TSA | Craig, Mayes, Rogers | 57 min |
| May 20, 6:41 PM CDT | Tornado Warning | TSA | Washington | 49 min |
| May 20, 6:43 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Tulsa | 62 min |
| May 20, 6:56 PM CDT | Tornado Warning | TSA | Mayes | 49 min |
| May 20, 6:59 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 46 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; radar from the NEXRAD Level II archive.