Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 434, NWS Norman, OK

August 27, 2002Bryan County, Johnston County, Marshall County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 27, 2002, 6:34 AM CDT for Bryan County, Johnston County, Marshall County, Oklahoma. It was in force for 56 min. 2 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: Aug 27, 2002, 6:34 AM CDT (11:34 UTC)
Expired: Aug 27, 2002, 7:30 AM CDT
In force: 56 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Bryan County, OK, Johnston County, OK, Marshall County, OK

The radar

The Norman radar (KTLX), 152 km from the middle of the area, began a volume at 11:37 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
Aug 27, 6:35 AM CDT	Thunderstorm Wind 52 E	Roberta, OK
Aug 27, 7:30 AM CDT	Thunderstorm Wind	Durant, OK	Four inch diameter tree limbs were downed.

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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 11.6 hours before the alert went out and 146 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: 1167 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1993 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.7

Open this sounding in Storm Lab

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 Aug 27, 3:35 AM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, Aug 27, 3:35 AM CDT, 2 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
335 AM CDT TUE AUG 27 2002

AN INTENSE MCS HAS PASSED ACROSS ABOUT 2/3 OF OUR FORECAST AREA AS
OF 330 AM.  BY THE TIME THE ZONE FORECAST TAKES EFFECT AT 7 AM...
THE LEADING EDGE OF THE MCS SHOULD BE NEAR THE RED RIVER.  THE
FORECAST WILL BEGIN WITH STORMS IN OUR SOUTH AND CENTRAL COUNTIES...
WITH THE RAIN SLOWLY DECREASING THIS MORNING.  ADDITIONAL STORM
DEVELOPMENT IS POSSIBLE THIS AFTERNOON AS VERTICAL MOTION IS
FORECAST TO PERSIST ACROSS THE REGION... AND THERE WILL BE SURFACE
BOUNDARIES LEFT OVER FROM THE MORNING CONVECTION.

THE GREATER CHANCE FOR STORMS WILL COME AGAIN TONIGHT AS ANOTHER MCS
IS LIKELY TO DEVELOP... MUCH THE SAME AS THE CURRENT ONE... ALTHOUGH
PERHAPS A BIT FARTHER WEST... AND HOPEFULLY NOT AS INTENSE.  HAVE
EDGED POPS UP SOME FOR TONIGHT IN ALL LOCATIONS.

THE NIGHTLY MCS SCENARIO DOES NOT END UNTIL THURSDAY... IF THE
MODELS ARE TO BE BELIEVED.  SO... HAVE KEPT MODEST POPS INTO
WEDNESDAY NIGHT... AND HAVE LEFT THE FORECAST DRY FOR THE REST OF
THE FORECAST PERIOD.

OTHER THAN CHANGES TO CLOUD COVER AND MINOR TEMPERATURE
ADJUSTMENTS... DID NOT MAKE MUCH IN THE WAY OF CHANGES TO THE
REMAINDER OF THE FORECAST.

FCSTID = 23 = CMS

OKC   88  69  88  68 /  90  50  20  30
HBR   88  68  88  68 /  60  60  30  40
SPS   88  71  94  72 / 100  60  30  40
GAG   86  65  87  65 /  40  60  30  40
PNC   88  69  88  68 /  50  40  20  30
DUA   90  70  92  71 / 100  40  20  30

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

In the hours before

Local storm report, Aug 27, 2:25 AM CDT, 4 hours 9 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
225 AM CDT TUE AUG 27 2002

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

0200 AM    7 W WATONGA               OK   61 MPH WIND GUST
08/27/02   BLAINE                         MEASURED BY OKLAHOMA
                                          MESONET. WIND 33028G53KT.
                                          ALSO GUST TO 58 MPH AT
                                          0155 AM.

...SPEG.

Local storm report, Aug 27, 2:57 AM CDT, 3 hours 37 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
257 AM CDT TUE AUG 27 2002

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

0205 AM    4 WSW WEATHERFORD         OK   80 MPH WIND GUST
08/27/02   CUSTER                         MEASURED BY OKLAHOMA
                                          MESONET. WIND 35047G70KT.
                                          ALSO 69 MPH GUST AT 0210 AM
                                          AND 60 MPH GUST AT 0215 AM.

0210 AM    4 WNW BESSIE              OK   60 MPH WIND GUST
08/27/02   WASHITA                        MEASURED BY OKLAHOMA
                                          MESONET. WIND 36041G52KT.

...SPEG.

Local storm report, Aug 27, 5:00 AM CDT, 1 hour 34 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
500 AM CDT TUE AUG 27 2002

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

0220 AM    7 W HINTON                OK   63 MPH WIND GUST
08/27/02   CADDO                          MEASURED BY OKLAHOMA
                                          MESONET.

0248 AM    2 NW BETHANY              OK   59 MPH WIND GUST
08/27/02   OKLAHOMA                       ASOS MEASUREMENT AT WILEY
                                          POST AIRPORT. PK WND
                                          04051/0748

0255 AM    2 S RETROP                OK   58 MPH WIND GUST
08/27/02   WASHITA                        MEASURED BY OKLAHOMA
                                          MESONET.

0300 AM    4 SE HOBART               OK   63 MPH WIND GUST
08/27/02   KIOWA                          ASOS MEASUREMENT AT HOBART
                                          AIRPORT. PK WND 02055/0800.

0311 AM    4 NW CHICKASHA            OK   66 MPH WIND GUST
08/27/02   GRADY                          AWOS MEASUREMENT AT
                                          CHICKASHA AIRPORT. WIND
                                          33049G57KT

0313 AM    OKLAHOMA CITY             OK   60 MPH WIND GUST
08/27/02   CLEVELAND                      60 TO 70 MPH WIND ESTIMATED
                                          BY OFF DUTY NWS EMPLOYEE
                                          JUST SOUTH OF SW 89 AND
                                          PENN

0318 AM    MOORE                     OK   65 MPH WIND GUST
08/27/02   CLEVELAND                      MEASURED AT MOORE EOC

0325 AM    NORMAN                    OK   80 MPH WIND GUST
08/27/02   CLEVELAND                      ESTIMATED WIND BY OFF DUTY
                                          SPC EMPLOYEE ON WEST SIDE
                                          OF NORMAN.  POWER LINES
                                          DOWNED. TIME ESTIMATED.

0326 AM    FREDERICK                 OK   76 MPH WIND GUST
08/27/02   TILLMAN                        REPORTED BY EMERGENCY
                                          MANAGER

0327 AM    NORMAN                    OK   73 MPH WIND GUST
08/27/02   CLEVELAND                      MEASURED AT STORM
                                          PREDICTION CENTER

0327 AM    NORMAN                    OK   59 MPH WIND GUST
08/27/02   CLEVELAND                      MEASURED AT NWS NORMAN

0329 AM    NORMAN                    OK   67 MPH WIND GUST
08/27/02   CLEVELAND                      AWOS MEASUREMENT AT NORMAN
                                          AIRPORT. WIND 0347G58KT.

0330 AM    NORMAN                    OK   69 MPH WIND GUST
08/27/02   CLEVELAND                      MEASURED BY OKLAHOMA
                                          MESONET.

0331 AM    4 NW CHICKASHA            OK   62 MPH WIND GUST
08/27/02   GRADY                          AWOS MEASUREMENT AT
                                          CHICKASHA AIRPORT. WIND
                                          36032G54KT.

0335 AM    3 SW LAWTON               OK   66 MPH WIND GUST
08/27/02   COMANCHE                       ASOS MEASUREMENT AT
                                          LAWTON MUNICIPAL AIRPORT.
                                          PK WND 36057/0835.

0400 AM    6 SSW WASHINGTON          OK   67 MPH WIND GUST
08/27/02   MCCLAIN                        MEASURED BY OKLAHOMA
                                          MESONET. WIND 32033G58KT.

0400 AM    DUNCAN                    OK   67 MPH WIND GUST
08/27/02   STEPHENS                       MEASURED NEAR 9TH STREET
                                          AND BOIS D ARC BY SPOTTER

0413 AM    BURKBURNETT               TX   74 MPH WIND GUST
08/27/02   WICHITA                        MEASURED AT BURKBURNETT
                                          POLICE DEPARTMENT. DAMAGE
                                          TO UTILITY POLES

0422 AM    WICHITA FALLS             TX   60 MPH WIND GUST
08/27/02   WICHITA                        MEASURED AT US-281 AND
                                          HATTON ROAD BY SPOTTER.

0431 AM    SHEPPARD AFB              TX   61 MPH WIND GUST
08/27/02   WICHITA                        MEASURED AT SHEPPARD AFB.
                                          PK WND 01053/0931

0433 AM    1 N HENRIETTA             TX   61 MPH WIND GUST
08/27/02   CLAY                           MEASURED ALONG HWY 148 BY
                                          SPOTTER

0433 AM    IOWA PARK                 TX   60 MPH WIND GUST
08/27/02   WICHITA                        MEASURED BY SPOTTER.

0433 AM    WICHITA FALLS             TX   65 MPH WIND GUST
08/27/02   WICHITA                        MEASURED AT US-281 AND
                                          HATTON ROAD.  65 MPH
                                          MEASURED AGAIN 0440 AM.

...SPEG.

Local storm report, Aug 27, 5:40 AM CDT, 54 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
540 AM CDT TUE AUG 27 2002

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

0535 AM    7 N SPRINGER              OK   63 MPH WIND GUST
08/27/02   MURRAY                         MEASURED AT MM 46 ON I-35.
                                          REPORT FROM EM.

Local storm report, Aug 27, 5:55 AM CDT, 39 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
555 AM CDT TUE AUG 27 2002

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

0525 AM    1 N RINGLING              OK   63 MPH WIND GUST
08/27/02   JEFFERSON                      MEASURED BY OKLAHOMA
                                          MESONET

RS

Local storm report, Aug 27, 6:28 AM CDT, 6 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
628 AM CDT TUE AUG 27 2002

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

0600 AM    ARDMORE                   OK   WIND DAMAGE
08/27/02   CARTER                         TREES, LIMBS AND POWER
                                          LINES BLOWN DOWN. TIME
                                          APPROXIMATE. FROM EM.

RS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 10:51 PM CDT	Severe Thunderstorm Warning	OUN	Harper	54 min
Aug 26, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	59 min
Aug 27, 12:35 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	55 min
Aug 27, 1:00 AM CDT	Severe Thunderstorm Warning	OUN	Major	60 min
Aug 27, 1:07 AM CDT	Severe Thunderstorm Warning	OUN	Custer	53 min
Aug 27, 1:32 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	43 min
Aug 27, 2:06 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Custer, Kingfisher, Washita	54 min
Aug 27, 2:46 AM CDT	Severe Thunderstorm Warning	OUN	Grady	59 min
Aug 27, 2:49 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	41 min
Aug 27, 2:57 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	63 min
Aug 27, 3:19 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	56 min
Aug 27, 3:30 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain, Stephens	75 min
Aug 27, 3:46 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	44 min
Aug 27, 4:21 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Murray	69 min
Aug 27, 4:33 AM CDT	Severe Thunderstorm Warning	OUN	Cotton	57 min
Aug 27, 4:54 AM CDT	Severe Thunderstorm Warning	OUN	Garvin	36 min
Aug 27, 5:05 AM CDT	Severe Thunderstorm Warning	OUN	Love	40 min
Aug 27, 5:28 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston, Marshall	62 min
Aug 27, 5:38 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Murray	37 min
Aug 27, 4:12 AM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	63 min
Aug 27, 4:42 AM CDT	Severe Thunderstorm Warning	OUN	Archer	48 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2002 Every severe thunderstorm warning in 2002

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.