Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 377, NWS Tulsa, OK

September 7, 2001Ottawa County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Sep 7, 2001, 8:57 PM CDT for Ottawa County, Oklahoma. It was in force for 63 min. 2 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
Sep 7, 2001, 8:57 PM CDT (01:57 UTC)
Expired
Sep 7, 2001, 10:00 PM CDT
In force
63 min
Issued by
NWS Tulsa, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Ottawa County, OK

The radar

The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 01:59 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
Sep 7, 9:20 PM CDTThunderstorm Wind 61 EOkemah, OKThunderstorm winds estimated at 70 miles an hour damaged utility barns, blew down trees and blew down power poles.
Sep 7, 10:05 PM CDTHail 0.88Weleetka, 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 watch it was issued in

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

IssuedProductOfficeLasted
Sep 7, 7:00 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.0 hours before the alert went out and 102 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, Norman, OK at 00:00Z on 2001-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3154 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, Norman, OK at 00:00Z on 2001-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 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
3154 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1262 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
2.3
Supercell composite
17.3

Open this sounding in Storm Lab

The text

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

538 
WUUS54 KTSA 080157
SVRTUL
OKC107-080230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
857 PM CDT FRI SEP 7 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OKFUSKEE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 930 PM CDT

* AT 856 PM CDT...DOPPLER RADAR INDICATED THE LEADING EDGE OF A LINE 
OF SEVERE THUNDERSTORMS EXTENDING FROM OKFUSKEE TO 7 MILES WEST OF 
BEARDEN...MOVING EAST AT 20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...WELTY...
  OKFUSKEE...CASTLE...PHAROAH...CLEARVIEW...BEARDEN...WELEETKA AND
  OKEMAH.

WIND GUSTS TO 60 MPH AND HAIL TO THE SIZE OF DIMES CAN BE EXPECTED 
IN THE WARNED AREA.

THE DAMAGING WINDS WILL OCCUR OUT AHEAD OF THE HEAVY RAIN AND 
HAIL. MOVE TO A SAFE PLACE NOW.

A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS.

LAT...LON 3564 9651 3531 9643 3530 9598 3565 9622

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 7, 7:07 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Sep 7, 7:07 PM CDT, 1 hour 50 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
707 PM CDT FRI SEP 7 2001

WILL UPDATE FOR NEW TORNADO WATCH NUMBER 720 IN EFFECT UNTIL
MIDNIGHT.

MESONET WINDS AND 3 HOURLY PRESSURE FALLS SUGGEST THAT TORNADO
THREAT SHUD REMAIN N OF I-40.  PRIMARY SEVERE WEATHER
THREAT...HOWEVER...WILL BE LARGE HAIL AND DAMAGING WINDS.

ALSO PUSHED OFF POPS FOR FAR SE OK AND NW AR UNTIL AFTER MIDNIGHT.

UPDATE OUT AROUND 715 PM.

FCSTID = 18

.TSA...
AR...NONE.
OK...TORNADO WATCH UNTIL MIDNIGHT CDT SATURDAY FOR ZONES
OKZ054>068...OKZ070>071...OKZ073.

In the hours before

Local storm report, Sep 7, 8:12 PM CDT, 45 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
812 PM CDT FRI SEP 07 2001

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

0710 PM    2 S WYNONA                OK    73 MPH TSTM GUST
09/07/01   OSAGE                           MESONET REPORT.
Local storm report, Sep 7, 8:30 PM CDT, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
830 PM CDT FRI SEP 07 2001

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

0750 PM    DRUMRIGHT                 OK    60 MPH TSTM GUST
09/07/01   CREEK                           SPOTTER REPORT.

0800 PM    BARTLESVILLE              OK    70 MPH TSTM GUST
09/07/01   WASHINGTON                      REPORTED BY OKLAHOMA
                                           HIGHWAY PATROL.
Local storm report, Sep 7, 8:32 PM CDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
832 PM CDT FRI SEP 7 2001

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

0750 PM    DRUMRIGHT                 OK    60 MPH TSTM GUST
09/07/01   CREEK                           SPOTTER REPORT.

0800 PM    BARTLESVILLE              OK    70 MPH TSTM GUST
09/07/01   WASHINGTON                      REPORTED BY OKLAHOMA
                                           HIGHWAY PATROL.
Local storm report, Sep 7, 8:44 PM CDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
844 PM CDT FRI SEP 07 2001

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

0815 PM    2 ENE COPAN               OK    61 MPH TSTM GUST
09/07/01   WASHINGTON                      MESONET REPORT
Local storm report, Sep 7, 8:53 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
853 PM CDT FRI SEP 07 2001

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

0826 PM    6 W PADEN                 OK    60 MPH TSTM GUST
09/07/01   OKFUSKEE                        REPORTED BY EMERGENCY
                                           MANAGEMENT.
Special weather statement, Sep 7, 8:57 PM CDT, 0 minutes before
OKZ054-055-059-080230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
857 PM CDT FRI SEP 7 2001

TORNADO WATCH NUMBER 720 HAS BEEN CANCELLED FOR PAWNEE...OSAGE AND
WASHINGTON COUNTIES IN NORTHEAST OKLAHOMA.  THUNDERSTORMS WERE
MOVING OUT OF THESE COUNTIES AND THREAT OF SEVERE WEATHER IS OVER.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 7:27 PM CDTSevere Thunderstorm WarningTSACreek63 min
Sep 7, 7:38 PM CDTSevere Thunderstorm WarningTSAOsage, Washington52 min
Sep 7, 7:38 PM CDTSevere Thunderstorm WarningTSAPawnee52 min
Sep 7, 7:59 PM CDTSevere Thunderstorm WarningTSANowata61 min
Sep 7, 8:03 PM CDTSevere Thunderstorm WarningTSACreek, Tulsa57 min
Sep 7, 8:03 PM CDTSevere Thunderstorm WarningTSARogers57 min
Sep 7, 8:10 PM CDTSevere Thunderstorm WarningTSAOkfuskee50 min
Sep 7, 8:22 PM CDTSevere Thunderstorm WarningTSACraig38 min
Sep 7, 8:39 PM CDTSevere Thunderstorm WarningTSAOkmulgee, Wagoner51 min
Sep 7, 8:55 PM CDTSevere Thunderstorm WarningTSATulsa35 min
Sep 7, 8:57 PM CDTSevere Thunderstorm WarningTSACraig, Mayes, Rogers63 min
Sep 7, 8:57 PM CDTSevere Thunderstorm WarningTSAOkfuskee33 min
Sep 7, 9:13 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee62 min
Sep 7, 9:13 PM CDTSevere Thunderstorm WarningTSAWagoner62 min
Sep 7, 9:39 PM CDTSevere Thunderstorm WarningTSAOkfuskee66 min
Sep 7, 9:40 PM CDTSevere Thunderstorm WarningTSADelaware65 min
Sep 7, 9:41 PM CDTSevere Thunderstorm WarningTSACherokee64 min
Sep 7, 10:11 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee, Okmulgee64 min
Sep 7, 10:14 PM CDTSevere Thunderstorm WarningTSAAdair61 min
Sep 7, 10:30 PM CDTSevere Thunderstorm WarningTSAPittsburg60 min
Sep 7, 10:39 PM CDTSevere Thunderstorm WarningTSAHaskell66 min
Sep 7, 10:54 PM CDTSevere Thunderstorm WarningTSACherokee, Sequoyah, Wagoner66 min
Sep 7, 10:59 PM CDTSevere Thunderstorm WarningTSAPittsburg46 min
Sep 7, 11:13 PM CDTSevere Thunderstorm WarningTSAMcIntosh47 min
Sep 7, 11:24 PM CDTSevere Thunderstorm WarningTSAAdair51 min
Sep 7, 11:31 PM CDTSevere Thunderstorm WarningTSALatimer, Pushmataha59 min
Sep 7, 11:42 PM CDTSevere Thunderstorm WarningTSAHaskell, LeFlore, Sequoyah63 min
Sep 8, 12:19 AM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha56 min
Sep 8, 1:15 AM CDTSevere Thunderstorm WarningTSALeFlore60 min
Sep 8, 3:41 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer64 min
Sep 8, 3:50 PM CDTSevere Thunderstorm WarningTSAPittsburg55 min
Sep 8, 4:45 PM CDTSevere Thunderstorm WarningTSALatimer60 min
Sep 8, 5:18 PM CDTSevere Thunderstorm WarningTSAPushmataha57 min
Sep 8, 5:30 PM CDTSevere Thunderstorm WarningTSALeFlore60 min
Sep 8, 6:09 PM CDTSevere Thunderstorm WarningTSALatimer66 min
Sep 8, 6:14 PM CDTFlash Flood WarningTSALatimer3 hr
Sep 8, 6:30 PM CDTSevere Thunderstorm WarningTSALeFlore60 min
Sep 8, 6:43 PM CDTSevere Thunderstorm WarningTSAPushmataha62 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.