Alert archive / Oklahoma / Tornado Warnings in 2003

Tornado Warning 40, NWS Norman, OK

April 30, 2003Grant County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 30, 2003, 11:15 PM CDT for Grant County, Oklahoma. It was in force for 45 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 30, 2003, 11:15 PM CDT (04:15 UTC)
Expired: May 1, 2003, 12:00 AM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Grant County, OK

The radar

The Vance AFB radar (KVNX), 47 km from the middle of the area, began a volume at 04:17 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 30, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.3 hours before the alert went out and 185 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: 2775 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 1288 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOUN 010415
TOROKC
OKC053-010500-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1113 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  GRANT COUNTY IN NORTHERN OKLAHOMA

* UNTIL MIDNIGHT CDT

* AT 1113 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 8 MILES SOUTH OF RENFROW...MOVING   
EAST AT 15 MPH.  FUNNEL CLOUDS HAVE BEEN REPORTED FROM THIS STORM.

THE MOST DANGEROUS PORTION OF THIS STORM WILL TRACK ALONG AND NORTH 
OF HIGHWAY 11.  TENNIS BALL SIZED HAIL WILL CAUSE DAMAGE...AS WELL.

* LOCATIONS IN THE WARNING INCLUDE DEER CREEK AND RENFROW

A TORNADO MAY FORM AT ANYTIME. TAKE COVER NOW. ABANDON 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.

LAT...LON 3691 9773 3678 9773 3679 9747 3698 9747

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Custer	48 min
Apr 30, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	34 min
Apr 30, 8:24 PM CDT	Severe Thunderstorm Warning	OUN	Kay	36 min
Apr 30, 8:35 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	40 min
Apr 30, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	47 min
Apr 30, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Grant	49 min
Apr 30, 10:13 PM CDT	Tornado Warning	OUN	Grant	32 min
Apr 30, 10:21 PM CDT	Flash Flood Warning	OUN	Grant	114 min
Apr 30, 10:40 PM CDT	Tornado Warning	OUN	Grant	35 min
Apr 30, 11:35 PM CDT	Severe Thunderstorm Warning	OUN	Kay	40 min
May 1, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Kay	63 min

Nearby

Tornado Warnings in Oklahoma, 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.