Alert archive / Texas / Tornado Warnings in 2003

Tornado Warning 31, NWS Norman, OK

April 23, 2003Knox County, Texas

NWS Norman, OK issued this tornado warning at Apr 23, 2003, 2:00 PM CDT for Knox County, Texas. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 23, 2003, 2:00 PM CDT (19:00 UTC)
Expired: Apr 23, 2003, 2:30 PM CDT
In force: 30 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 109 km from the middle of the area, began a volume at 19:03 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
Apr 23, 11:50 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.0 hours before the alert went out and 246 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: 131 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOUN 231900
TOROKC
TXC275-231930-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
159 PM CDT WED APR 23 2003

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  KNOX COUNTY IN NORTHERN TEXAS

* UNTIL 230 PM CDT

* AT 159 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 7 MILES NORTHWEST OF BENJAMIN...
  MOVING EAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE BENJAMIN...GILLILAND...TRUSCOTT
  AND VERA

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 3373 10000 3353 9998 3354 9952 3378 9950

$$

30

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 1:32 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	43 min
Apr 23, 2:03 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	42 min
Apr 23, 2:17 PM CDT	Severe Thunderstorm Warning	OUN	Foard	43 min
Apr 23, 2:27 PM CDT	Tornado Warning	OUN	Knox	33 min
Apr 23, 2:59 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	46 min
Apr 23, 3:44 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	31 min

Nearby

Tornado Warnings in Texas, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.