Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 12, NWS Norman, OK

February 9, 2001Bryan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Feb 9, 2001, 2:45 AM CST for Bryan County, Oklahoma. It was in force for 30 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Feb 9, 2001, 2:45 AM CST (08:45 UTC)
Expired
Feb 9, 2001, 3:15 AM CST
In force
30 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Bryan County, OK

The radar

The Norman radar (KTLX), 179 km from the middle of the area, began a volume at 08:46 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

TimeReportWhereRemark
Feb 9, 2:45 AM CSTThunderstorm WindColbert, OKFour mobile homes and nine barns were destroyed by high winds.
Feb 9, 2:55 AM CSTThunderstorm WindCalera, OKFour barns were destroyed, and siding was blown off a mobile home.
Feb 9, 3:00 AM CSTThunderstorm WindDurant, OKA tractor-trailer overturned on Highway 70, on the east end of the Roosevelt bridge. The driver was injured and taken to a local hospital.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 8, 11:00 PM CSTTornado WatchSPC6 hr
Feb 9, 2:45 AM CSTTornado WatchSPC4 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 8.8 hours before the alert went out and 158 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2001-02-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 553 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2001-02-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
553 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
243 m²/s²
0-3 km storm-relative helicity
314 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Feb 8, 10:05 PM CST, 4 hours 40 minutes earlier.

Area forecast discussion, Feb 8, 10:05 PM CST, 4 hours 40 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1005 PM CST THU FEB 8 2001

MAIN CONCERN THIS EVENING HAS BEEN STEADY MOVEMENT OF SHALLOW ARCTIC
AIR INTO NORTHWEST OKLAHOMA AND ASSOCIATED VARIETY OF PRECIP TYPES
NORTH OF THE BOUNDARY. AS OF MID EVENING...COLD FRONT WAS LOCATED
FROM NEAR STILLWATER SOUTHWESTWARD TO NEAR QUANAH TEXAS WITH
TEMPERATURES ACROSS FAR NORTHWEST OKLAHOMA ALREADY INTO THE MID AND
UPPER 20S. RECENT SURFACE OBS AND CALLS TO THAT AREA INDICATE A
MIXTURE OF FREEZING RAIN...SLEET..AND SNOW...WITH OCCASIONAL RUMBLES
OF THUNDER. GROUND TEMPERATURES ARE STILL WARM HOWEVER RELATIVE TO
THE SURFACE AIR WHICH HAS GREATLY LIMITED SIGNIFICANT ACCCUMS OF
ICE/SNOW FROM DEVELOPING. BACK EDGE OF DEEPEST MOISTURE AND
STRONGEST SYNOPTIC SCALE LIFT IS JUST BEGINNING TO ENTER EXTREME
WESTERN OKLAHOMA AT THIS TIME.

COLD FRONT SHOULD ACCELERATE SOUTHEASTWARD AFTER MIDNIGHT AS UPPER
LOW LIFTS OUT ALLOWING ARCTIC AIR TO MOVE FASTER AND FARTHER THAN
EXPECTED INTO THE FORECAST AREA WITH SEVERAL HOURS OF SIGNIFICANT
PRECIP TO FALL INTO SUB FREEZING AIR PARTICULARLY ACROSS NORTH
CENTRAL OKLAHOMA. FOR THIS REASON RECENTLY UPDATED THE WINTER
WEATHER ADVISORY TO INCLUDE NORTH CENTRAL OKLAHOMA AND A FEW MORE
COUNTIES TO THE SOUTH. WOULD NOT BE SURPRISED TO SEE ICE PROBLEMS
DEVELOP EVEN FARTHER SOUTH INTO THE AREA LATE TONIGHT/EARLY FRIDAY
BUT WILL LEAVE THAT UP TO THE MIDNIGHT SHIFT TO DECIDE.

SQUALL LINE ACROSS THE EASTERN TEXAS PANHANDLE SHOULD PICK UP
EASTWARD SPEED AND PERHAPS INTENSITY AS IT ENCOUNTERS DEEPER
MOISTURE OVER CENTRAL TEXAS. SEVERE THUNDERSTORM WATCH ALREADY IN
EFFECT FOR PARTS OF SOUTHWEST OKLAHOMA AND WESTERN NORTH TEXAS FOR
PRIMARILY LARGE HAIL AND SEVERE WIND GUSTS.

UPDATES TO THE ZONES AND WINTER WEATHER ADVISORY HAVE ALREADY BEEN
ISSUED.

.OUN...
OK...WINTER WEATHER ADVISORY TONIGHT OKZ004>018
TX...NONE.
JAMESL

In the hours before

Local storm report, Feb 8, 11:54 PM CST, 2 hours 51 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1154 PM CST THU FEB 08 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1130 PM    3 W MEDICINE PARK         OK   68 MPH WIND GUST
02/08/01   COMANCHE                       RECORDED BY OKLAHOMA
                                          MESONET

1130 PM    3 W GRANDFIELD            OK   67 MPH WIND GUST
02/08/01   TILLMAN                        RECORDED BY OKLAHOMA
                                          MESONET

1153 PM    WICHITA FALLS             TX   58 MPH WIND GUST
02/08/01f   WICHITA                        RECORDED BY ASOS

KT
Local storm report, Feb 9, 12:18 AM CST, 2 hours 27 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1218 AM CST FRI FEB 09 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1140 PM    3 W MEDICINE PARK         OK   58 MPH WIND GUST
02/08/01   COMANCHE

1145 PM    3 W MEDICINE PARK         OK   62 MPH WIND GUST
02/08/01   COMANCHE                            R

J
Local storm report, Feb 9, 12:28 AM CST, 2 hours 17 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1228 AM CST FRI FEB 09 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1200 AM    1 NW WALTERS              OK   61 MPH WIND GUST
02/09/01   COTTON

1215 AM    6 MW MARLOW               OK   WIND DAMAGE
02/09/01   STEPHENS                       BARN AND TREES BLOWN
                                          DOWN.

J
Special weather statement, Feb 9, 12:57 AM CST, 1 hour 48 minutes before
OKZ037-044-TXZ085-086-088>090-090745-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1257 AM CST FRI FEB 9 2001

...TORNADO WATCH NUMBER 15 HAS BEEN CANCELLED FOR THE FOLLOWING
COUNTIES IN OKLAHOMA AND NORTH TEXAS...

IN OKLAHOMA...TILLMAN AND COTTON COUNTIES.

IN TEXAS...WILBARGER...BAYLOR...WICHITA...ARCHER...AND CLAY
COUNTIES.

SEVERE THUNDERSTORMS HAVE MOVED EAST OF THESE COUNTIES AND NO
ADDITIONAL SEVERE THUN(DERSTORM DEVELOPMENT IS EXPECTED.
Local storm report, Feb 9, 1:54 AM CST, 51 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
154 AM CST FRI FEB 09 2001

TIME (CST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0143 AM    LONE GROVE                OK   WIND DAMAGE
02/09/01   CARTER                         ROOF DAMAGED

0148 AM    ARDMORE                   OK   WIND DAMAGE
02/09/01   CARTER                         ROOF DAMAGED

J
Local storm report, Feb 9, 2:44 AM CST, 1 minute before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 8, 11:35 PM CSTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman40 min
Feb 9, 12:03 AM CSTSevere Thunderstorm WarningOUNJefferson42 min
Feb 9, 12:03 AM CSTSevere Thunderstorm WarningOUNGrady, Stephens42 min
Feb 9, 12:46 AM CSTSevere Thunderstorm WarningOUNCarter, Garvin, McClain, Stephens59 min
Feb 9, 12:46 AM CSTSevere Thunderstorm WarningOUNJefferson59 min
Feb 9, 1:41 AM CSTSevere Thunderstorm WarningOUNCarter, Murray49 min
Feb 9, 2:03 AM CSTSevere Thunderstorm WarningOUNJohnston, Pontotoc42 min
Feb 9, 2:58 AM CSTSevere Thunderstorm WarningOUNAtoka32 min
Feb 8, 10:19 PM CSTSevere Thunderstorm WarningOUNHardeman41 min
Feb 8, 10:35 PM CSTSevere Thunderstorm WarningOUNFoard, Knox, Wilbarger40 min
Feb 8, 11:05 PM CSTSevere Thunderstorm WarningOUNBaylor40 min
Feb 8, 11:35 PM CSTSevere Thunderstorm WarningOUNArcher, Wichita40 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001Every 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.