Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 549, NWS Norman, OK

September 7, 20015 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 2001, 6:49 PM CDT for 5 counties in Oklahoma. It was in force for 41 min. 7 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: Sep 7, 2001, 6:49 PM CDT (23:49 UTC)
Expired: Sep 7, 2001, 7:30 PM CDT
In force: 41 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Canadian County, OK, Cleveland County, OK, Comanche County, OK, Grady County, OK, McClain County, OK

The radar

The Norman radar (KTLX), 57 km from the middle of the area, began a volume at 23:49 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
Sep 7, 7:07 PM CDT	Hail 0.75	Mustang, OK
Sep 7, 7:15 PM CDT	Hail 1.5	Tuttle, OK
Sep 7, 7:17 PM CDT	Hail 1	Chickasha, OK
Sep 7, 7:33 PM CDT	Hail 0.88	Oklahoma City, OK	Hail was reported near the intersection of 134th and Western.
Sep 7, 7:34 PM CDT	Hail 0.88	Oklahoma City, OK	Hail was reported near the intersection of 134th and Pennsylvania.
Sep 7, 7:34 PM CDT	Hail 1	Middleberg, OK
Sep 7, 7:34 PM CDT	Hail 1	Blanchard, 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, 11.8 hours before the alert went out and 41 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

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 7, 3:10 PM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, Sep 7, 3:10 PM CDT, 3 hours 39 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, 6:12 PM CDT, 37 minutes before

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

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

0545 PM    OKARCHE                   OK   2.00 INCH HAIL
09/07/01   KINGFISHER                     SPOTTER REPORT

0555 PM    6 S KINGFISHER            OK   1.00 INCH HAIL
09/07/01   KINGFISHER                     REPORTED BY COUNTY
                                          EMERGENCY MANAGER

0555 PM    MARSHALL                  OK   .75 INCH HAIL
09/07/01   LOGAN                          REPORTED BY NWS COOP
                                          OBSERVER

0605 PM    7 W RED ROCK              OK   .75 INCH HAIL
09/07/01   NOBLE                          PUBLIC REPORT

KT

Special weather statement, Sep 7, 6:16 PM CDT, 33 minutes before

OKZ006-007-011-015>017-022-035-072350-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
616 PM CDT FRI SEP 7 2001

SEVERE THUNDERSTORM WATCH NUMBER 715 IS NO LONGER IN EFFECT FOR
ALFALFA... GRANT... AND MAJOR COUNTIES IN NORTH-CENTRAL OKLAHOMA.
THE WATCH IS ALSO NO LONGER IN EFFECT FOR BLAINE... DEWEY...
CUSTER... WASHITA... AND KIOWA COUNTIES IN WEST-CENTRAL OKLAHOMA. THE
THREAT OF SEVERE WEATHER HAS ENDED IN THIS AREA. THIS WATCH REMAINS
IN EFFECT TO THE EAST OF THESE COUNTIES.

CMS

Local storm report, Sep 7, 6:28 PM CDT, 21 minutes before

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

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

0600 PM    6 NW KAW CITY             OK   61 MPH WIND GUST
09/07/01   KAY                            MEASURED BY OKLAHOMA
                                          MESONET

KT

Local storm report, Sep 7, 6:33 PM CDT, 16 minutes before

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

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

0622 PM    KAW CITY                  OK   .75 INCH HAIL
09/07/01   KAY                            REPORTED BY KAW CITY
                                          EMERGENCY MANAGER

KT

Local storm report, Sep 7, 6:39 PM CDT, 10 minutes before

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

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

0638 PM    GUTHRIE                   OK   1.00 INCH HAIL
09/07/01   LOGAN                          AMATEUR RADIO REPORT

KT

Local storm report, Sep 7, 6:48 PM CDT, 1 minute before

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

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

0555 PM    CALUMET                   OK   1.75 INCH HAIL
09/07/01   CANADIAN                       SHERIFF OFFICE

0646 PM    2 S PIEDMONT              OK   0.88 INCH HAIL
09/07/01   CANADIAN                       SPOTTER

0605 PM    6 NW KAW CITY             OK   61 MPH WIND GUST
09/07/01   KAY                            MEASURE BY MESONET

JF

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, 6:01 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	44 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	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; radar from the NEXRAD Level II archive.