Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 147, NWS Tulsa, OK

May 20, 2001Nowata County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 2001, 7:06 PM CDT for Nowata County, Oklahoma. It was in force for 54 min. No storm report in the archive falls 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.

The facts

Issued: May 20, 2001, 7:06 PM CDT (00:06 UTC)
Expired: May 20, 2001, 8:00 PM CDT
In force: 54 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Nowata County, OK

The radar

The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 00:05 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 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 00:00Z, 0.1 hours before the alert went out and 163 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 621 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1200 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KTSA 210007
SVRTUL

OKC105-210100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
706 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NOWATA COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 800 PM CDT

* AT 706 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 9
  MILES WEST OF WATOVA...MOVING NORTH AT 30 MPH.

* SOME LOCATIONS NEAR `THE PATH OF THIS STORM INCLUDE...WATOVA...
  LENAPAH...DELAWARE AND NOWATA.

HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 70 MPH CAN BE EXPECTED 
IN THE WARNED AREA.

LAT...LON 3660 9583 3662 9543 3699 9541 3700 9580

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, 1 hour 26 minutes earlier.

Area forecast discussion, May 20, 5:40 PM CDT, 1 hour 26 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, 5:30 PM CDT, 1 hour 36 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 ENE

Local storm report, May 20, 5:52 PM CDT, 1 hour 14 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   TULSA

Local storm report, May 20, 6:08 PM CDT, 58 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   TULSA

Local storm report, May 20, 6:11 PM CDT, 55 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
m

Local storm report, May 20, 6:14 PM CDT, 52 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 MEASUREMENT

Local storm report, May 20, 6:34 PM CDT, 32 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 REPORT

The 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, 7:12 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, 11:06 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, 2001 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.