Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 53, NWS Norman, OK

April 10, 2001Canadian County, Oklahoma County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 10, 2001, 11:26 AM CDT for Canadian County, Oklahoma County, Oklahoma. It was in force for 49 min. 3 reports came from 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, with what was reported inside it.

The facts

Issued: Apr 10, 2001, 11:26 AM CDT (16:26 UTC)
Expired: Apr 10, 2001, 12:15 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Canadian County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 38 km from the middle of the area, began a volume at 16:36 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.

What was reported inside it

Time	Report	Where	Remark
Apr 10, 11:35 AM CDT	Hail 1	Mustang, OK
Apr 10, 11:40 AM CDT	Hail 1.75	Oklahoma City, OK	Hail was reported near the intersection of Southwest 8th and Council Road.
Apr 10, 11:45 AM CDT	Hail 0.88	Wheatland, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 4.4 hours before the alert went out and 35 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: 1709 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

167 
WUUS54 KOUN 101626
SVROKC
OKC017-109-101715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1126 AM CDT TUE APR 10 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CANADIAN COUNTY IN CENTRAL OKLAHOMA
  OKLAHOMA COUNTY IN CENTRAL OKLAHOMA

* UNTIL 1215 PM CDT

* AT 1122 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 7
  MILES SOUTH OF UNION CITY...MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IN THE WARNING INCLUDE BETHANY...DEL CITY...MIDWEST
  CITY...MUSTANG...NICHOLS HILLS...OKLAHOMA CITY...SPENCER...THE
  VILLAGE...TINKER AIR FORCE BASE...UNION CITY AND WARR ACRES

HAIL UP TO THE SIZE OF PING PONG BALLS IS LIKELY WITH THIS SEVERE 
THUNDERSTORM.

LAT...LON 3540 9794 3536 9779 3539 9766 3541 9730
          3566 9746

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 Apr 10, 11:20 AM CDT, 6 minutes earlier.

Area forecast discussion, Apr 10, 11:20 AM CDT, 6 minutes before

AREA FORECAST DISCUSSION...UPDATED...
NATIONAL WEATHER SERVICE NORMAN OK
1120 AM CDT TUE APR 10 2001

WILL MAKE A FEW MORE ADJUSTMENTS TO FIRST PERIOD FORECAST...BASED ON
LATEST REMOTE SENSING TRENDS. ALTHOUGH ISOLATED TO SCATTERED
CONVECTION STILL A POSSIBILITY ACROSS PORTIONS OF THE FORECAST AREA
THIS AFTERNOON...THE MAIN SHOW WILL BE THIS EVENING AND OVERNIGHT.
WILL KEEP CHANCE POPS GOING ACROSS MOST ZONES FOR THE AFTERNOON.
WILL ALSO LOWER HIGH TEMP FORECAST ESPECIALLY ACROSS NORTHERN ZONES
AS THICK CLOUD COVER PERSISTENT.

WILL ALSO DROP WIND ADVISORY FOR THIS AFTERNOON AS CURRENT
CONDITIONS AND MODEL PROGD WINDS NOT QUITE HIGH ENOUGH. IT WILL BE
WINDY BUT THINK SPEEDS WILL REMAIN BELOW ADVISORY CRITERIA FOR OUR
AREA.

FCSTID = 11

.OUN...
OK...WIND ADVISORY TONIGHT OKZ...004>018-021>023-033>036-038.
TX...WIND ADVISORY TONIGHT TXZ...083>090.

In the hours before

Special weather statement, Apr 10, 7:00 AM CDT, 4 hours 26 minutes before

OKZ004>048-050>052-TXZ083>090-101330-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
700 AM CDT TUE APR 10 2001

IN OKLAHOMA AND WESTERN NORTH TEXAS THERE IS A MODERATE RISK FOR
SEVERE WEATHER TONIGHT WEST OF U.S. HIGHWAY 81. A SLIGHT RISK FOR
SEVERE WEATHER EXISTS TONIGHT TO THE EAST U.S. HIGHWAY 81.

A STRONG UPPER LEVEL STORM SYSTEM IS EXPECTED TO MOVE INTO NEW
MEXICO EARLY THIS EVENING. THE TEXAS PANHANDLE DRYLINE WILL MOVE
QUICKLY EAST INTO WESTERN OKLAHOMA THIS EVENING AS THE UPPER SYSTEM
RACES INTO SOUTHWEST KANSAS OVERNIGHT. THUNDERSTORMS ARE EXPECTED TO
DEVELOP ON THE DRYLINE IN TEXAS AND MOVE INTO OKLAHOMA.

VERTICAL WIND PROFILES WILL INITIALLY BE FAVORABLE FOR SUPERCELL
DEVELOPMENT...BUT A SQUALL LINE IS EXPECTED TO DEVELOP LATER TONIGHT
AS THE VERTICAL WIND PROFILE BECOMES MORE UNIDIRECTIONAL. THE MAIN
SEVERE WEATHER THREATS WILL BE DAMAGING WINDS AND LARGE HAIL WITH
THE SQUALL LINE. HOWEVER...TORNADOES ARE POSSIBLE IN WESTERN
OKLAHOMA AND WESTERN NORTH TEXAS WITH ANY SUPERCELLS THAT FORM THIS
EVENING.

VERY HIGH FIRE DANGER WILL EXIST THIS AFTERNOON ACROSS WESTERN AND
CENTRAL OKLAHOMA AND WESTERN NORTH TEXAS. REFER TO THE FIRE DANGER
STATEMENT...FNUS84...FOR DETAILS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 11:05 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	40 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.