Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 128, NWS Norman, OK

May 6, 2002Lincoln County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 6, 2002, 1:34 AM CDT for Lincoln County, Pottawatomie County, Oklahoma. It was in force for 41 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 6, 2002, 1:34 AM CDT (06:34 UTC)
Expired: May 6, 2002, 2:15 AM CDT
In force: 41 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

Counties Lincoln County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 42 km from the middle of the area, began a volume at 06:36 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
May 6, 1:55 AM CDT	Thunderstorm Wind 52 E	Wellston, OK
May 6, 2:05 AM CDT	Thunderstorm Wind	Wellston, OK	An eight inch diameter tree limb was downed.
May 6, 2:20 AM CDT	Thunderstorm Wind	Wellston, OK	An eight foot long tree limb was blocking a road.

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 watch it was issued in

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

Issued	Product	Office	Lasted
May 6, 1:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.6 hours before the alert went out and 58 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: 1804 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 060634
SVROKC
OKC081-125-060715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
133 AM CDT MON MAY 6 2002

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LINCOLN COUNTY IN CENTRAL OKLAHOMA
  NORTHERN POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA

* UNTIL 215 AM CDT

* AT 133 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 11   
  MILES NORTHWEST OF MCLOUD. THE STORM WAS MOVING EAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE AVERY...CARNEY...CHANDLER...
  DAVENPORT...KENDRICK...MCLOUD...MEEKER...PRAGUE...SPARKS...WARWICK
  AND WELLSTON

HAIL UP TO THE SIZE OF QUARTERS IS LIKELY WITH THIS SEVERE
THUNDERSTORM.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING PARTICULARLY DAMAGING
WINDS. MOBILE HOMES AND HIGH PROFILE VEHICLES ARE ESPECIALLY
SUSCEPTIBLE TO HIGH WINDS AND MAY BE OVERTURNED. MOVE TO A STURDY
BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 3539 9716 3541 9676 3552 9666 3588 9667
          3584 9714

WR

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 May 5, 5:00 PM CDT, 8 hours 34 minutes earlier.

Area forecast discussion, May 5, 5:00 PM CDT, 8 hours 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
500 PM CDT SUN MAY 5 2002

TSTMS FIRING IN VICINITY OF DRYLINE OVER TX/OK PANHANDLES WILL MOVE
EAST INTO WESTERN PORTION OF THE FA THIS EVENING. MEANWHILE...
WEAKENING BOUNDARY ACROSS NORTH TEXAS NOT SHOWING MUCH ENHANCEMENT
IN THE CU FIELD AT THIS TIME... SUGGESTING DRYLINE INDUCED
CONVECTION MAY BE THE PRIMARY SHOW. WILL GO HIGHEST POPS OVER THE
WEST OVERNIGHT AND GENERALLY AROUND 40 PERCENT OVER CENTRAL
SECTIONS. IF CURRENT TX CONVECTION EVOLVES INTO AN MCS... MAY NEED
TO RAISE POPS OVER CENTRAL SECTIONS FOR LATE TONIGHT. LOOKS LIKE
DRYLINE MAY CONTINUE TO BE ACTIVE NEXT COUPLE OF DAYS WITH AFTERNOON
AND EVENING TSTMS POSSIBLY MAINLY ACROSS THE WESTERN SECTIONS. MID
LEVEL TEMPS WILL BE WARMING DURING THIS PERIOD... WHICH COULD LIMIT
COVERAGE AND EASTERN EXTENT OF STORMS.

IN THE LONGER TERM... ACOLD FRONT IS STILL ON TRACK TO MOVE INTO
CENTRAL OKLAHOMA LATE WED AFTN AND INTO NORTH TEXAS BY THURS MORNING
WHERE IT IS FCST TO BECOME STATIONARY. WILL CONTINUE WITH THE
CURRENT FCST OF A CHANCE OF TSTMS ON WEDNESDAY IN MOST AREAS. WILL
ALSO MAINTAIN A POSSIBILITY FOR TSTMS ON THURSDAY IN THE SOUTHERN
ZONES DUE TO THE FRONT STALLING OUT JUST SOUTH OF THE CWA WHILE 850
MB WINDS ARE FORECAST TO REMAIN SOUTHERLY ABOVE THE FRONTAL
INVERSION. COULD BE SOME ELEVATED STORMS EARLY FRIDAY WITH WARM
ADVECTION PATTERN SPREADING ACROSS THE REMAINDER OF THE AREA. BEST
CHANCES FOR STORMS FRIDAY AND SATURDAY WILL BE IN THE AFTN/EVE HOURS
IN THE WEST WHERE DRYLINE MAY BECOME MORE ACTIVE AHEAD OF AN UPPER
TROUGH MOVING INTO THE SOUTHWEST US. STORMS POSSIBLE AGAIN MOST
PLACES ON SUNDAY WITH ANOTHER FRONT MOVING INTO THE REGION. FRONT
WILL COOL TEMPS A COUPLE CATEGORIES WED AND THURSDAY...BEFORE
WARMING BACK UP STARTING FRIDAY.

FCSTID = 32
OKC   67  85  67  86 /  40  10  10   0
HBR   66  89  66  90 /  60  20  20  20
SPS   68  88  69  89 /  50  10  10   0
GAG   61  89  63  90 /  60  30  30  20
PNC   65  85  65  87 /  40  10  10   0
DUA   69  86  70  87 /  40  10  10   0

.OUN...
OK...NONE.

TX...NONE.

In the hours before

Local storm report, May 5, 10:27 PM CDT, 3 hours 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1027 PM CDT SUN MAY 05 2002

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

1023 PM    GRANITE                   OK   1.00 INCH HAIL
05/05/02   GREER                          REPORTED BY GREER COUNTY EM

JLP

Local storm report, May 5, 10:56 PM CDT, 2 hours 38 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1056 PM CDT SUN MAY 05 2002

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

1048 PM    3 E MADGE                 OK   .75 INCH HAIL
05/05/02   HARMON                         AMATEUR RADIO REPORT

1057 PM    5 NW HOBART               OK   .75 INCH HAIL
05/05/02   KIOWA                          AMATEUR RADIO REPORT

JLP

Local storm report, May 5, 11:14 PM CDT, 2 hours 20 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1114 PM CDT SUN MAY 05 2002

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

1114 PM    MAGNUM                    OK   1.00 INCH HAIL
05/05/02   GREER                          REPORTED BY COUNTY EM

JLP

Local storm report, May 5, 11:50 PM CDT, 1 hour 44 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1150 PM CDT SUN MAY 05 2002

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

1145 PM    RETROP                    OK   1.00 INCH HAIL
05/05/02   BECKHAM                        REPORTED BY SPOTTER

Local storm report, May 6, 12:17 AM CDT, 1 hour 17 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1217 AM CDT MON MAY 06 2002

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

1209 AM    DILL CITY                 OK   .88 INCH HAIL
05/06/02   WASHITA                        REPORTED BY SPOTTER

Local storm report, May 6, 1:27 AM CDT, 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
127 AM CDT MON MAY 06 2002

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

0105 AM    OKLAHOMA CITY             OK   63 MPH WIND GUST
05/06/02   OKLAHOMA                       REPORTED BY ASOS AT WILL
                                          ROGERS AIRPORT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 7:32 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	43 min
May 5, 8:10 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	50 min
May 5, 8:37 PM CDT	Tornado Warning	OUN	Dewey	38 min
May 5, 8:39 PM CDT	Tornado Warning	OUN	Dewey	36 min
May 5, 9:12 PM CDT	Tornado Warning	OUN	Dewey	48 min
May 5, 9:25 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	50 min
May 5, 9:51 PM CDT	Tornado Warning	OUN	Harmon	39 min
May 5, 10:02 PM CDT	Tornado Warning	OUN	Dewey	28 min
May 5, 10:12 PM CDT	Tornado Warning	OUN	Major	33 min
May 5, 10:21 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa	29 min
May 5, 10:31 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	44 min
May 5, 10:44 PM CDT	Tornado Warning	OUN	Blaine, Major	46 min
May 5, 10:49 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	41 min
May 5, 11:17 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa	43 min
May 5, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	46 min
May 6, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Washita	32 min
May 6, 12:35 AM CDT	Severe Thunderstorm Warning	OUN	Caddo	40 min
May 6, 1:09 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	51 min
May 6, 2:16 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln	29 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.