Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 153, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 2001, 7:39 PM CDT for Okfuskee County, Okmulgee County, Oklahoma. It was in force for 51 min. 2 reports 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 20, 2001, 7:39 PM CDT (00:39 UTC)
- Expired
- May 20, 2001, 8:30 PM CDT
- In force
- 51 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Okfuskee County, OK, Okmulgee County, OK
The radar
The Tulsa radar (KINX), 86 km from the middle of the area, began a volume at 00:40 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 7:42 PM CDT | Hail 0.75 | Henryetta, OK | |
| May 20, 7:55 PM CDT | Hail 0.75 | Hoffman, 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, 3:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 130 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
- 2068 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1431 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 13.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS54 KTSA 210040
SVRTUL
OKC107-111-210130-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
739 PM CDT SUN MAY 20 2001
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN OKFUSKEE COUNTY IN EAST CENTRAL OKLAHOMA
OKMULGEE COUNTY IN NORTHEAST OKLAHOMA
* UNTIL 830 PM CDT
* AT 739 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6
MILES SOUTH OF HENRYETTA...MOVING NORTHEAST AT 45 MPH.
* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...MORRIS...
SCHULTER...GRAYSON...DEWAR...HENRYETTA...OKMULGEE...PHAROAH...
CLEARVIEW AND WELEETKA.
HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 70 MPH CAN BE
EXPECTED IN THE WARNED AREA.
A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS.
THIS IS A DANGEROUS STORM. IF YOU ARE NEAR ITS PATH YOU SHOULD
PREPARE FOR VERY LARGE HAIL AND STRONG DAMAGING STRAIGHT LINE WINDS.
SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS!
LAT...LON 3565 9581 3547 9585 3530 9599 3529 9623
3542 9621 3562 9610
XWhat 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, 1 hour 59 minutes earlier.
Area forecast discussion, May 20, 5:40 PM CDT, 1 hour 59 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
Local storm report, May 20, 6:08 PM CDT, 1 hour 31 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 hour 28 minutes 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
mLocal storm report, May 20, 6:14 PM CDT, 1 hour 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
614 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
053r5 PM 7 SW BURBANK OK 67 MPH TSTM GUST
05/20/01 OSAGE MESONET MEASUREMENTLocal storm report, May 20, 6:34 PM CDT, 1 hour 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
634 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0630 PM 1 S PAWHUSKA OK TORNADO
05/20/01 OSAGE AMATEUR RADIO REPORTLocal storm report, May 20, 7:28 PM CDT, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
728 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0639 PM 5 W PAWHUSKA OK 65 MPH TSTM GUST
05/20/01 OSAGE ESTIMATE BY AMATEUR RADIO
0654 PM 1 NW STIGLER OK TORNADO
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM WHITEFIELD OK .75 INCH HAIL
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM 3 WNW STIGLER OK 92 MPH TSTM GUST
05/20/01 HASKELL MESONET MEASUREMENT
0657 PM STIGLER OK TORNADO
05/20/01 HASKELL TV CHASE TEAM REPORTED
20 SECOND TOUCHDOWN
0721 PM VERA OK .88 INCH HAIL
05/20/01 WASHINGTON AMATEUR RADIO REPORT
@ RUKWBCe KDENNWUS54 KTSA 210032
LSRTUL
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
732 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0639 PM 5 W PAWHUSKA OK 65 MPH TSTM GUST
05/20/01 OSAGE ESTIMATE BY AMATEUR RADIO
0654 PM 1 NW STIGLER OK TORNADO
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM WHITEFIELD OK .75 INCH HAIL
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM 3 WNW STIGLER OK 92 MPH TSTM GUST
05/20/01 HASKELL MESONET MEASUREMENT
0657 PM STIGLER OK TORNADO
05/20/01 HASKELL TV CHASE TEAM REPORTED
20 SECOND TOUCHDOWN
0721 PM VERA OK .88 INCH HAIL
05/20/01 WASHINGTON AMATEUR RADIO REPORTLocal storm report, May 20, 7:32 PM CDT, 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
732 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0639 PM 5 W PAWHUSKA OK 65 MPH TSTM GUST
05/20/01 OSAGE ESTIMATE BY AMATEUR RADIO
0654 PM 1 NW STIGLER OK TORNADO
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM WHITEFIELD OK .75 INCH HAIL
05/20/01 HASKELL EMERGENCY MGMT REPORT
0655 PM 3 WNW STIGLER OK 92 MPH TSTM GUST
05/20/01 HASKELL MESONET MEASUREMENT
0657 PM STIGLER OK TORNADO
05/20/01 HASKELL TV CHASE TEAM REPORTED
20 SECOND TOUCHDOWN
0721 PM VERA OK .88 INCH HAIL
05/20/01 WASHINGTON AMATEUR RADIO REPORTThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:00 PM CDT | Tornado Warning | TSA | Pittsburg | 60 min |
| May 20, 7:06 PM CDT | Severe Thunderstorm Warning | TSA | Nowata | 54 min |
| May 20, 7:12 PM CDT | Tornado Warning | TSA | LeFlore, Sequoyah | 63 min |
| May 20, 7:16 PM CDT | Tornado Warning | TSA | Haskell | 44 min |
| May 20, 7:17 PM CDT | Severe Thunderstorm Warning | TSA | Ottawa | 28 min |
| May 20, 7:20 PM CDT | Tornado Warning | TSA | Latimer | 55 min |
| May 20, 7:23 PM CDT | Severe Thunderstorm Warning | TSA | Rogers | 67 min |
| May 20, 7:30 PM CDT | Severe Thunderstorm Warning | TSA | Tulsa, Washington | 45 min |
| May 20, 7:32 PM CDT | Severe Thunderstorm Warning | TSA | Craig | 43 min |
| May 20, 7:43 PM CDT | Tornado Warning | TSA | Pittsburg | 62 min |
| May 20, 7:48 PM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 42 min |
| May 20, 8:08 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee | 67 min |
| May 20, 8:09 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 51 min |
| May 20, 8:19 PM CDT | Tornado Warning | TSA | Latimer, LeFlore | 56 min |
| May 20, 8:27 PM CDT | Severe Thunderstorm Warning | TSA | Mayes | 63 min |
| May 20, 8:34 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 26 min |
| May 20, 8:46 PM CDT | Severe Thunderstorm Warning | TSA | Haskell | 44 min |
| May 20, 9:00 PM CDT | Tornado Warning | TSA | LeFlore | 60 min |
| May 20, 9:19 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 41 min |
| May 20, 9:50 PM CDT | Severe Thunderstorm Warning | TSA | Haskell | 40 min |
| May 20, 9:59 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 46 min |
| May 20, 10:04 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee | 56 min |
| May 20, 10:13 PM CDT | Severe Thunderstorm Warning | TSA | Latimer, Pushmataha | 62 min |
| May 20, 10:25 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 50 min |
| May 20, 10:39 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 51 min |
| May 20, 10:46 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 59 min |
| May 20, 10:52 PM CDT | Flash Flood Warning | TSA | Haskell, LeFlore, Sequoyah | 113 min |
| May 20, 11:06 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 54 min |
| May 20, 11:07 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 38 min |
| May 20, 11:31 PM CDT | Severe Thunderstorm Warning | TSA | Haskell | 44 min |
| May 20, 11:45 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 45 min |
| May 20, 11:50 PM CDT | Severe Thunderstorm Warning | TSA | Latimer | 55 min |
| May 20, 11:56 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 49 min |
| May 21, 12:03 AM CDT | Tornado Warning | TSA | LeFlore | 27 min |
| May 21, 12:45 AM CDT | Severe Thunderstorm Warning | TSA | Pittsburg, Pushmataha | 45 min |
| May 21, 1:28 AM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 62 min |
| May 21, 2:26 AM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 64 min |
| May 21, 2:29 AM CDT | Flash Flood Warning | TSA | Pushmataha | 3 hr |
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.