Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 87, NWS Norman, OK

October 9, 2001Grady County, Oklahoma

NWS Norman, OK issued this tornado warning at Oct 9, 2001, 8:47 PM CDT for Grady County, Oklahoma. It was in force for 43 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: Oct 9, 2001, 8:47 PM CDT (01:47 UTC)
Expired: Oct 9, 2001, 9:30 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Grady County, OK

The radar

The Norman radar (KTLX), 47 km from the middle of the area, began a volume at 01:49 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
Oct 9, 5:30 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.8 hours before the alert went out and 36 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: 1756 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 413 m²/s²
0-3 km storm-relative helicity: 448 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 15.8

Open this sounding in Storm Lab

The text

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

469 
WFUS54 KOUN 100148
TOROKC
OKC051-100230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
847 PM CDT TUE OCT 9 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  GRADY COUNTY IN CENTRAL OKLAHOMA

* UNTIL 930 PM CDT

* AT 847 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 4 MILES WEST OF TUTTLE...MOVING EAST
  AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE TUTTLE

TAKE COVER NOW. LEAVE MOBILE HOMES AND VEHICLES. IF POSSIBLE...MOVE
TO A BASEMENT OR STORM SHELTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR
HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS AND OUTSIDE
WALLS.

LAT...LON 3535 9786 3521 9787 3519 9768 3534 9769

CJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 7:13 PM CDT	Tornado Warning	OUN	Caddo	32 min
Oct 9, 7:34 PM CDT	Tornado Warning	OUN	Grady	41 min
Oct 9, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	30 min
Oct 9, 7:54 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	51 min
Oct 9, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	50 min
Oct 9, 8:17 PM CDT	Tornado Warning	OUN	Grady, McClain	28 min
Oct 9, 8:46 PM CDT	Tornado Warning	OUN	Cleveland, McClain	29 min
Oct 9, 8:52 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	38 min
Oct 9, 9:13 PM CDT	Tornado Warning	OUN	Cleveland, McClain	32 min
Oct 9, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	49 min
Oct 9, 10:32 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma	43 min
Oct 10, 12:45 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Pontotoc	45 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.