Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 603, NWS Norman, OK

September 20, 2001Blaine County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 20, 2001, 10:19 PM CDT for Blaine County, Oklahoma. It was in force for 41 min. 1 report 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
Sep 20, 2001, 10:19 PM CDT (03:19 UTC)
Expired
Sep 20, 2001, 11:00 PM CDT
In force
41 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Blaine County, OK

What was reported inside it

TimeReportWhereRemark
Sep 20, 10:35 PM CDTHail 0.88Watonga, 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

Lamont, OK (KLMN), launched 00:00Z, 3.3 hours before the alert went out and 119 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, Lamont, OK at 00:00Z on 2001-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 644 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, Lamont, OK at 00:00Z on 2001-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 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
644 J/kg
Mixed-layer CIN
-279 J/kg
Mixed-layer LCL
1410 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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 Sep 20, 9:40 PM CDT, 39 minutes earlier.

Area forecast discussion, Sep 20, 9:40 PM CDT, 39 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
940 PM CDT THU SEP 20 2001

ONE MORE ZONE UPDATE ISSUED TO CLEAN THINGS UP A BIT BASED ON LATEST
RADAR TRENDS. REMOVED MENTION OF SEVERE BUT KEPT HEAVY RAIN
PROSPECTS ALL AREAS. ADJUSTED A FEW LOW TEMPS OVERNIGHT BASED ON
RECENT TRENDS AND REMOVED TEMPORAL WORDING FOR WINDS IN SOME OF THE
GROUPS. STILL EXPECTING MORE RAINFALL OVERNIGHT WITH APPROACH OF
SHORT WAVE.

.OUN...
OK...FLASH FLOOD WATCH AFTER MIDNIGHT FOR
OKZ 030>032-039>043-045>048-050>052
TX...NONE.

33/DLF

In the hours before

Local storm report, Sep 20, 7:25 PM CDT, 2 hours 54 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
725 PM CDT THU SEP 20 2001

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

0645 PM    2 W PLAINVIEW             OK   3.00 INCH HAIL
09/20/01   WOODS                          SPOTTER REPORT

0710 PM    11 E BUFFALO              OK   2.00 INCH HAIL
09/20/01   HARPER                         PUBLIC REPORT

J
Local storm report, Sep 20, 7:50 PM CDT, 2 hours 29 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
750 PM CDT THU SEP 20 2001

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

0705 PM    VERA                      TX   WIND DAMAGE. POWER POLES
09/20/01   KNOX                           DOWN. AMATEUR RADIO
                                          REPORT.

J
Local storm report, Sep 20, 8:00 PM CDT, 2 hours 19 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
800 PM CDT THU SEP 20 2001

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

0748 PM    3 E BUFFALO               OK   .75 INCH HAIL
09/20/01   HARPER                         PUBLIC REPORT

0740 PM    10 E BUFFALO              OK   1.25 INCH HAIL
09/20/01   HARPER                         SPOTTER REPORT

J
Local storm report, Sep 20, 8:07 PM CDT, 2 hours 12 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
807 PM CDT THU SEP 20 2001

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

0625 PM    4 NNW PLAINVIEW           OK   .75 INCH HAIL
09/20/01   WOODS                          PUBLIC REPORT

J
Local storm report, Sep 20, 8:45 PM CDT, 1 hour 34 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
845 PM CDT THU SEP 20 2001

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

0815 PM    5 N WOODWARD              OK   1.00 INCH HAIL
09/20/01   WOODWARD                       SPOTTER REPORT

J
Local storm report, Sep 20, 9:09 PM CDT, 1 hour 10 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
909 PM CDT THU SEP 20 2001

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

0900 PM    9 SSW WOODWARD            OK   .75 INCH HAIL
09/20/01   WOODWARD                       PUBLIC REPORT

J

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 7:30 PM CDTSevere Thunderstorm WarningOUNHarper45 min
Sep 20, 8:04 PM CDTSevere Thunderstorm WarningOUNWoodward41 min
Sep 20, 8:13 PM CDTSevere Thunderstorm WarningOUNEllis, Harper32 min
Sep 20, 8:45 PM CDTSevere Thunderstorm WarningOUNWoodward45 min
Sep 20, 10:39 PM CDTSevere Thunderstorm WarningOUNKingfisher51 min
Sep 20, 10:48 PM CDTSevere Thunderstorm WarningOUNGarfield27 min
Sep 20, 10:54 PM CDTSevere Thunderstorm WarningOUNBlaine51 min
Sep 20, 11:38 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher52 min
Sep 21, 1:05 AM CDTSevere Thunderstorm WarningOUNKay25 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.