Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 545, NWS Norman, OK

September 7, 2001Logan County, Noble County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 2001, 6:01 PM CDT for Logan County, Noble County, Payne County, Oklahoma. It was in force for 44 min. 6 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, 6:01 PM CDT (23:01 UTC)
Expired: Sep 7, 2001, 6:45 PM CDT
In force: 44 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Logan County, OK, Noble County, OK, Payne County, OK

What was reported inside it

Time	Report	Where
Sep 7, 6:05 PM CDT	Hail 0.75	Red Rock, OK
Sep 7, 6:38 PM CDT	Hail 1	Guthrie, OK
Sep 7, 6:50 PM CDT	Hail 0.88	Coyle, OK
Sep 7, 6:50 PM CDT	Thunderstorm Wind 56 E	Coyle, OK
Sep 7, 6:50 PM CDT	Hail 0.88	Perkins, OK
Sep 7, 6:50 PM CDT	Thunderstorm Wind 56 E	Perkins, 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.

Issued	Product	Office	Lasted
Sep 7, 3:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.0 hours before the alert went out and 110 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: 1886 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 610 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 345 m²/s²
0-3 km storm-relative helicity: 307 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

450 
WUUS54 KOUN 072302
SVROKC
OKC083-103-119-072345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
601 PM CDT FRI SEP 7 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LOGAN COUNTY IN CENTRAL OKLAHOMA
  PAYNE COUNTY IN CENTRAL OKLAHOMA
  NOBLE COUNTY IN NORTHERN OKLAHOMA

* UNTIL 645 PM CDT

* AT 601 PM CDT...DOPPLER RADAR DETECTED A LINE OF SEVERE
  THUNDERSTORMS FROM MARLAND TO 14 MILES WEST OF NAVINA...MOVING EAST
  AT 40 MPH.

* LOCATIONS IN THE WARNING INCLUDE CEDAR VALLEY...CIMARRON CITY...
  COYLE...CRESCENT...GLENCOE...GUTHRIE...LANGSTON...LOVELL...
  LUCIEN...MARLAND...MERIDIAN...MORRISON...MULHALL...NAVINA...
  ORLANDO...PERRY...RED ROCK AND STILLWATER

HAIL UP TO THE SIZE OF GOLFBALLS IS LIKELY WITH THESE SEVERE 
THUNDERSTORMS. DAMAGING WINDS OVER 60 MPH ALSO ARE POSSIBLE. 

THIS LINE OF THUNDERSTORMS MAY PRODUCE WEAK...SHORT LIVED TORNADOES 
ALONG ITS LEADING EDGE. WIND SPEEDS WITH ANY TORNADO ARE NOT LIKELY 
TO GREATLY EXCEED THOSE OF THE STRAIGHT LINE WINDS OF THE 
THUNDERSTORM.

LAT...LON 3660 9727 3602 9768 3573 9767 3573 9732
          3658 9659

24

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 7, 3:10 PM CDT, 2 hours 51 minutes earlier.

Area forecast discussion, Sep 7, 3:10 PM CDT, 2 hours 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
310 PM CDT FRI SEP 7 2001

THE FESTIVITIES ARE BEGINNING ALREADY WITH ECHOES DEVELOPING ALONG
THE FRONT IN SOUTHERN KANSAS AND TOWERING CU VISIBLE OUT THE
WINDOW.  18Z SOUNDING SHOWED GOOD CAPPING WITH 22C AT 850 MB.  SO
THE QUESTION IS HOW FAR SOUTH WILL THE THUNDERSTORMS DEVELOP.
CONVECTION IS A GOOD BET IN THE NORTH WITH THE WAVE APPROACHING AND
ITS ASSOCIATED MID LEVEL COOLING.  CHANCES ARE A BIT MORE IFFY IN
THE SOUTHWEST AND THEREFORE WILL GO WITH CHANCE POPS THERE.  WITH
THUNDERSTORMS IN SOUTHWEST KANSAS AND THE WESTERN OKLAHOMA
PANHANDLE... CHANCE POPS ARE ALSO STILL NEEDED IN THE POST-FRONTAL
NORTHWEST ZONES.  WILL MENTION SEVERE IN THE ZONES AHEAD OF THE
FRONT.

THERE ARE PLUS AND MINUSES FOR RAIN CHANCES TOMORROW.  THERE MAY BE
SOME LINGERING SHOWERS IN THE MORNING... BUT FOR THE MOST PART THE
AREA WILL BE BETWEEN UPPER SYSTEMS AND SUBSIDENCE IN WAKE OF
TONIGHTS WAVE WILL ALLOW A RESPITE.  HOWEVER IT APPEARS THAT THE
FRONT WILL STALL OVER THE AREA AND THERE MAY BE EXTRA CONVECTIVE
BOUNDARIES IN THE NEIGHBORHOOD AS WELL.  SO AM CONCERNED THAT
BOUNDARIES WILL PROVIDE FOCUS FOR SCATTERED REDEVELOPMENT TOMORROW
AFTERNOON.

THE MODELS ARE STRONGER WITH THE SECONDARY WAVE THAT WILL APPROACH
THE AREA TOMORROW NIGHT... AND AGREE WITH MID SHIFT ASSESSMENT THAT
PRECIP CHANCES WILL EXTEND INTO SUNDAY NIGHT UNTIL THE SECOND WAVE
MOVES OUT OF THE AREA.  FARTHER DOWN THE LINE... NO CHANGES WILL BE
MADE TO THE EXTENDED.

...SPEG.
OKC   65  84  60  74 /  60  30  40  40
HBR   62  83  58  74 /  50  30  40  40
SPS   66  89  62  77 /  40  30  50  40
GAG   54  75  52  70 /  40  30  40  30
PNC   63  80  58  73 /  80  30  40  40
DUA   69  87  67  77 /  60  40  60  40

.OUN...
OK...NONE.
TX...NONE.

In the hours before

Local storm report, Sep 7, 4:49 PM CDT, 1 hour 12 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
449 PM CDT FRI SEP 07 2001

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

0435 PM    MEDFORD                   OK   .88 INCH HAIL
09/07/01   GRANT                          REPORTED BY NWS COOP
                                          OBSERVER

KT

Local storm report, Sep 7, 5:08 PM CDT, 53 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
508 PM CDT FRI SEP 07 2001

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

0445 PM    7 E POND CREEK            OK   1.00 INCH HAIL
09/07/01   GRANT                          PUBLIC REPORT

KT

Local storm report, Sep 7, 5:11 PM CDT, 50 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
511 PM CDT FRI SEP 07 2001

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

0510 PM    1 S BRAMAN                OK   1.75 INCH HAIL
09/07/01   KAY                            REPORTED BY COUNTY
                                          EMERGENCY MANAGER

KT

Local storm report, Sep 7, 5:18 PM CDT, 43 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
518 PM CDT FRI SEP 07 2001

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

0500 PM    4 E BISON                 OK   .88 INCH HAIL
09/07/01   GARFIELD                       PUBLIC REPORT

0515 PM    HENNESSEY                 OK   .75 INCH HAIL
09/07/01   KINGFISHER                     PUBLIC REPORT

KT

Local storm report, Sep 7, 5:24 PM CDT, 37 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
524 PM CDT FRI SEP 07 2001

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

0522 PM    3 S GARBER                OK   1.75 INCH HAIL
09/07/01   GARFIELD                       AMATEUR RADIO REPORT

KT

Local storm report, Sep 7, 5:34 PM CDT, 27 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
534 PM CDT FRI SEP 07 2001

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

0523 PM    5 WNW CALUMET             OK   .75 INCH HAIL
09/07/01   CANADIAN                       PUBLIC REPORT

0528 PM    KINGFISHER                OK   1.75 INCH HAIL
09/07/01   KINGFISHER                     REPORTED BY COUNTY
                                          EMERGENCY MANAGER

0529 PM    1 W DOUGLAS               OK   1.75 INCH HAIL
09/07/01   GARFIELD                       AMATEUR RADIO REPORT

KT

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 3:12 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Major	48 min
Sep 7, 3:12 PM CDT	Severe Thunderstorm Warning	OUN	Grant	48 min
Sep 7, 3:56 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	49 min
Sep 7, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major	45 min
Sep 7, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	48 min
Sep 7, 4:27 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	48 min
Sep 7, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	48 min
Sep 7, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble	64 min
Sep 7, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	64 min
Sep 7, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Kay	51 min
Sep 7, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Oklahoma	47 min
Sep 7, 6:19 PM CDT	Severe Thunderstorm Warning	OUN	Kay	21 min
Sep 7, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Noble, Payne	47 min
Sep 7, 6:49 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Comanche, Grady, McClain	41 min
Sep 7, 6:49 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	41 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.