Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 307, NWS Norman, OK

May 29, 2001Cotton County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 29, 2001, 5:50 AM CDT for Cotton County, Oklahoma. It was in force for 40 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 29, 2001, 5:50 AM CDT (10:50 UTC)
Expired: May 29, 2001, 6:30 AM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cotton County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 10.8 hours before the alert went out and 144 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: 389 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 1328 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 291050
SVROKC
OKC033-291130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
550 AM CDT TUE MAY 29 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COTTON COUNTY IN SOUTHWEST OKLAHOMA

* UNTIL 630 AM CDT

* AT 548 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 6
  MILES WEST OF RANDLETT...MOVING NORTHEAST AT 30 MPH.

* LOCATION.S IN THE WARNING INCLUDE COOKIETOWN...RANDLETT AND WALTERS

HAIL UP TO THE SIZE OF QUARTERS IS LIKELY WITH THIS SEVERE 
THUNDERSTORM.

LAT...LON 3435 9861 3413 9857 3407 9848 3442 9826
          3445 9849
JAMES

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 29, 4:31 AM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, May 29, 4:31 AM CDT, 1 hour 19 minutes before

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE NORMAN OK
431 AM CDT TUE MAY 28 2001

UPPER RIDGE OVER THE AREA IS MOVING EAST IN RESPONSE TO APPROACHING
UPPER LOW NEAR THE ARIZONA/NEW MEXICO BORDER. EXPECT UPWARD MOTION
TO SPREAD OVER THE AREA THROUGH THE DAY HELPING SCATTERED CONVECTION
TO AFFECT MOST AREAS. BY EARLY THIS EVENING STRONGER UVVS SHOULD
FORM ACROSS SOUTHWEST KANSAS/NORTHWEST OKLAHOMA NEAR LEFT EXIT
REGION OF UPPER JET. WITH ADEQUATE INSTABILITY AND ABUNDANT
MOISTURE...EXPECT ANOTHER LARGE COMPLEX OF STRONG TO SEVERE
THUNDERSTORMS TO DEVELOP AND PROPAGATE SOUTHEASTWARD ALONG THE LOW
LEVEL JET AXIS DURING THE OVERNIGHT PERIOD. ALONG WITH THE
POSSIBILITY OF TSRA LINGERING IN THE MORNING...LATEST ETA GUIDANCE
SHOWS FRONTAL BOUNDARY STALLING ACROSS SOUTHEAST OKLAHOMA UNTIL LATE
WEDNESDAY OR WEDNESDAY NIGHT.

BY THURSDAY AM...SUBSIDENCE SHOULD PREVAIL ACROSS THE ENTIRE AREA.
UPPER LEVEL NORTHWEST FLOW SHOULD ALLOW WEAK REINFORCEMENTS OF
COOLER AIR THROUGH FRIDAY. BY SATURDAY LATEST AVN IN CONSISTENT WITH
LAST NIGHTS MRF IN SHOWING A SLOW WARMING AND DRYING TREND TO
DEVELOP OVER THE WEEKEND. THESE MODELS TO SHOW WEAK CONVERGENCE
SETTING UP ALONG A DEVELOPING DRYLINE TO THE WEST. WILL NEED TO
MONITOR THE POSSIBILITY OF A FEW TSRA DRIFTING EASTWARD INTO WESTERN
OKLAHOMA SATURDAY NIGHT OR SUNDAY NIGHT. FOR NOW WILL KEEP IT
DRY...AND PASS CONCERNS ALONG TO THE NEXT SHIFT.

GAG 81/64/81/55 4720
PNC 80/64/82/58 3830
HBR 81/65/84/58 4630
OKC 81/65/84/60 3732
SPS 84/66/86/62 4642
DUR 82/66/87/65 3643

...CORRECTED FOR DATE
.OUN...
OK...NONE.
TX...NONE.
JAMES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 4:59 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	46 min
May 29, 9:58 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	32 min
May 29, 10:21 AM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	24 min
May 29, 10:24 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady	51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning 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.