Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 12, NWS Tulsa, OK

May 20, 2001Mayes County, Oklahoma

NWS Tulsa, OK issued this tornado warning at May 20, 2001, 6:56 PM CDT for Mayes County, Oklahoma. It was in force for 49 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, 6:56 PM CDT (23:56 UTC)
Expired: May 20, 2001, 7:45 PM CDT
In force: 49 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Mayes County, OK

The radar

The Tulsa radar (KINX), 28 km from the middle of the area, began a volume at 23:56 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

Springfield, MO (KSGF), launched 12:00Z, 11.9 hours before the alert went out and 149 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: 3 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KTSA 202357
TORTUL
OKC097-210045-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  MAYES COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 745 PM CDT

* AT 656 PM CDT...DOPPLER RADAR INDICATED A TORNADIC THUNDERSTORM 6 
  MILES WEST-SOUTHWEST OF PRYOR...MOVING EAST AT 20 MPH. EMERGENCY   
  MANAGEMENT OFFICIALS REPORTED A TORNADO ON THE GROUND WITH THIS   
  STORM 5 MILES WEST OF PRYOR. THIS IS A LIFE THREATENING SITUATION 
  ...TAKE COVER NOW!

* SOME LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...SALINA AND
  PRYOR.

IF YOU ARE IN OR NEAR THE PATH OF THIS TORNADO...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 TORNADOm...LARGE HAIL AND DAMAGING STRAIGHT LINE
WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE PLACE NOW!

LAT...LON 3636 9545 3618 9544 3625 9505 3646 9514

The 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, 6:12 PM CDT	Severe Thunderstorm Warning	TSA	Osage	48 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, 6:59 PM CDT	Severe Thunderstorm Warning	TSA	Osage	46 min

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.