Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 170, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 2001, 11:06 PM CDT for Pittsburg County, Oklahoma. It was in force for 54 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 20, 2001, 11:06 PM CDT (04:06 UTC)
- Expired
- May 21, 2001, 12:00 AM CDT
- In force
- 54 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pittsburg County, OK
The radar
The Tulsa radar (KINX), 135 km from the middle of the area, began a volume at 04:10 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, 11:55 PM CDT | Hail 0.75 | Blanco, 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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 4.1 hours before the alert went out and 145 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 210409 SVRTUL OKC121-210500- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1106 PM CDT SUN MAY 20 2001 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PITTSBURG COUNTY IN SOUTHEAST OKLAHOMA * UNTIL MIDNIGHT CDT * AT 1106 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG A LINE FROM ASHLAND TO HAYWOOD TO FEATHERSTON...MOVING EAST AT 30 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...CANADIAN... INDIANOLA...CROWDER...BLOCKER...SCIPIO...KIOWA...KREBS...ALDERSON... HAYWOOD...HARTSHORNE...SAVANNA...BLANCO AND MCALESTER. HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 70 MPH CAN BE EXPECTED IN THE WARNED AREA. THESE ARE DANGEROUS STORMS. 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 FjROM WINDOWS! LAT...LON 3508 9605 3474 9605 3473 9554 3528 9547
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, 9:50 PM CDT, 1 hour 16 minutes earlier.
Area forecast discussion, May 20, 9:50 PM CDT, 1 hour 16 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 950 PM CDT SUN MAY 20 2001 UPDATED FORECAST A WHILE AGO TO ADJUST FOR NEW TOR WATCH WHICH REPLACED EXPIRED WATCHES IN ERN OK. MAY CLEAR SOME NE OK COUNTIES SOON. DROPPED POPS IN A FEW NORTH AND WEST COUNTIES. RAISED MIN TEMPS A DEGREE OR TWO BUT FRONT NOW IN CENTRAL KS...SHOULD MAKE IT TO NE OK BEFORE 12Z. A FEW ISOLATED TSRA IN SE KS BUT NOT EXPECTED TO INCREASE IN COVERAGE. STILL LOOKS VERY COOL TOMORROW. FCSTID = 26 .TSA... AR...NONE. OK...NONE.
In the hours before
Local storm report, May 20, 9:30 PM CDT, 1 hour 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
930 PM CDT SUN MAY 20 2001
...CUMULATIVE REPORTS FOR THE DAY THROUGH 930 PM CDT...
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0850 AM WISTER OK WIND DAMAGE
05/20/01 LE FLORE ROOFS BLOWN OFF SEVERAL
BUILDINGS. TREES DOWN
JUST NORTH OF WISTER.
REPORTED BY EMERGENCY
MANAGEMENT.
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 ENE
0535 PM 7 SW BURBANK OK 67 MPH TSTM GUST
05/20/01 OSAGE MESONET MEASUREMENT
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 TULSA
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
0630 PM 1 S PAWHUSKA OK TORNADO
05/20/01 OSAGE AMATEUR RADIO REPORT
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
0755 PM 2 W SPIRO OK TORNADO
05/20/01 LE FLORE EMERGENCY MGMT REPORT
0755 PM ASHLAND OK 1.75 INCH HAIL
05/20/01 PITTSBURG PUBLIC REPORT
0802 PM FT SMITH AR 4.5 INCH HAIL
05/20/01 SEBASTIAN EMERGENCY MGMT REPORT
0813 PM 4 S LOCUST GROVE OK .75 INCH HAIL
05/20/01 MAYES EMER MGMT REPORT
0817 PM FT CHAFFEE AR 1.75 INCH HAIL
05/20/01 SEBASTIAN EMER MGMT REPORT
0835 PM PEGGS OK .88 INCH HAIL
05/20/01 CHEROKEE EMER MGMT REPORT
0851 PM 4 NE CLIFTY AR TORNADO
05/20/01 MADISON REPORTED BY CARROLL
COUNTY LAW ENF
0851 PM 3 W BRANCH AR TORNADO
05/20/01 FRANKLIN EMER MGMT REPORT
0904 PM BRANCH AR 1 INCH HAIL
05/20/01 FRANKLIN EMER MGMT REPORT
0920 PM 3 S HEAVENER OK .75 INCH HAIL
05/20/01 LE FLORE EMER MGMT REPORTLocal storm report, May 20, 9:33 PM CDT, 1 hour 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
933 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0850 AM WISTER OK WIND DAMAGE
05/20/01 LE FLORE ROOFS BLOWN OFF SEVERAL
BUILDINGS. TREES DOWN
JUST NORTH OF WISTER.
REPORTED BY EMERGENCY
MANAGEMENT.
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 ENE
0535 PM 7 SW BURBANK OK 67 MPH TSTM GUST
05/20/01 OSAGE MESONET MEASUREMENT
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 TULSA
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
0630 PM 1 S PAWHUSKA OK TORNADO
05/20/01 OSAGE AMATEUR RADIO REPORT
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
0755 PM 2 W SPIRO OK TORNADO
05/20/01 LE FLORE EMERGENCY MGMT REPORT
0755 PM ASHLAND OK 1.75 INCH HAIL
05/20/01 PITTSBURG PUBLIC REPORT
0802 PM FT SMITH AR 4.5 INCH HAIL
05/20/01 SEBASTIAN EMERGENCY MGMT REPORT
0813 PM 4 S LOCUST GROVE OK .75 INCH HAIL
05/20/01 MAYES EMER MGMT REPORT
0817 PM FT CHAFFEE AR 1.75 INCH HAIL
05/20/01 SEBASTIAN EMER MGMT REPORT
0835 PM PEGGS OK .88 INCH HAIL
05/20/01 CHEROKEE EMER MGMT REPORT
0851 PM 4 NE CLIFTY AR TORNADO
05/20/01 MADISON REPORTED BY CARROLL
COUNTY LAW ENF
0851 PM 3 W BRANCH AR TORNADO
05/20/01 FRANKLIN EMER MGMT REPORT
0904 PM BRANCH AR 1 INCH HAIL
05/20/01 FRANKLIN EMER MGMT REPORT
0920 PM 3 S HEAVENER OK .75 INCH HAIL
05/20/01 LE FLORE EMER MGMT REPORTLocal storm report, May 20, 9:51 PM CDT, 1 hour 15 minutes before
PRELIMINARY LOCAL STORM REPORT...UPDATED TO INCLUDE DAMAGE REPORT
NATIONAL WEATHER SERVICE TULSA OK
951 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0657 PM STIGLER OK TORNADO
05/20/01 HASKELL TV CHASE TEAM REPORT.
18 BUILDINGS DAMAGED...
1 BUSINESS DESTROYED...
1 HOME DESTROYEDLocal storm report, May 20, 9:54 PM CDT, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
954 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0930 PM 6 S MANSFIELD AR 60 MPH TSTM GUST
05/20/01 SEBASTIAN ESTIMATED BY SPOTTERLocal storm report, May 20, 9:54 PM CDT, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE TULSA OK
954 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0657 PM STIGLER OK TORNADO
05/20/01 HASKELL TV CHASE TEAM REPORT.
18 BUILDINGS DAMAGED...
1 BUSINESS DESTROYED...
1 HOME DESTROYEDLocal storm report, May 20, 9:56 PM CDT, 1 hour 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
956 PM CDT SUN MAY 20 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0930 PM 6 S MANSFIELD AR 60 MPH TSTM GUST
05/20/01 SEBASTIAN ESTIMATED BY SPOTTERThe 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, 7:39 PM CDT | Severe Thunderstorm Warning | TSA | Okfuskee, Okmulgee | 51 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, 11:07 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.