Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 13, NWS Tulsa, OK

May 20, 2001Pittsburg County, Oklahoma

NWS Tulsa, OK issued this tornado warning at May 20, 2001, 7:00 PM CDT for Pittsburg County, Oklahoma. It was in force for 60 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, 7:00 PM CDT (00:00 UTC)
Expired: May 20, 2001, 8:00 PM CDT
In force: 60 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), 127 km from the middle of the area, began a volume at 00:00 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, 3:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.0 hours before the alert went out and 153 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: 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

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KTSA 210000
TORTUL
OKC121-210100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
700 PM CDT SUN MAY 20 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR
  NORTHERN PITTSBURG COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 800 PM CDT

* AT 659 PM CDT...DOPPLER RADAR INDICATED A DEVELOPING TORNADO 4
  MILES NORTH OF KREBS. THIS DANGEROUS STORM IS MOVING EAST AT 30
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...CROWDER...  
BLOCKER...FEATHERSTON...KREBS AND MCALESTER.

IF YOU ARE IN OR NEAR THE PATH OF THIS STORM...TAKE COVER NOW! IF NO
UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE
SUBSTANTIAL SHELTER. AVOID WINDOWS!

IN ADDITION TO THE THREAT OF A TORNADO...LARGE HAIL AND DAMAGING
STRAIGHT LINE WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE
PLACE NOW!h

LAT...LON 3516 9549 3493 9543 3487 9610 3502 9611
          3513 9578

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
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, 11:06 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

Tornado Warnings in Oklahoma, 2001 Every tornado warning in 2001 Tornadoes 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.