Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 100, NWS Tulsa, OK

May 6, 2002Delaware County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 6, 2002, 2:39 AM CDT for Delaware County, Oklahoma. It was in force for 36 min. 1 report 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, 2:39 AM CDT (07:39 UTC)
Expired: May 6, 2002, 3:15 AM CDT
In force: 36 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Delaware County, OK

The radar

The Tulsa radar (KINX), 87 km from the middle of the area, began a volume at 07:41 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, 2:45 AM CDT	Thunderstorm Wind 61 E	Grove, OK	Thunderstorm winds estimated at 70 miles an hour blew down a tree. The tree fell on a carport.

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

Springfield, MO (KSGF), launched 00:00Z, 7.7 hours before the alert went out and 90 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: 303 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1379 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 060739
SVRTUL
OKC041-060815-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
239 AM CDT MON MAY 6 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DELAWARE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 315 AM CDT

* AT 239 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 8 MILES NORTHEAST OF GROVE TO 5 MILES
  NORTHEAST OF CHLOETA...MOVING EAST AT 45 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...JAY...
  CHLOETA AND GROVE.

WIND GUSTS TO 70 MPH CAN BE EXPECTED IN THE WARNED AREA. STAY
INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3673 9467 3640 9506 3627 9457 3666 9460

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 May 5, 11:50 PM CDT, 2 hours 49 minutes earlier.

Area forecast discussion, May 5, 11:50 PM CDT, 2 hours 49 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1150 PM CDT SUN MAY 5 2002

JUST SENT A QUICK UPDATE TO REMOVE TORNADO WATCH FROM OSAGE AND
PAWNEE COUNTIES.  GIVEN CURRENT PRECIPITATION TRENDS...NO OTHER
CHANGES MADE AT THIS TIME.

HOWIESON
FCSTID = 44

.TSA...
AR...NONE.
OK...NONE.

In the hours before

Local storm report, May 6, 12:22 AM CDT, 2 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1222 AM CDT MON MAY 6 2002

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

1125 PM    FORAKER                   OK   60 MPH TSTM WIND GUST
05/05/02   OSAGE                          MESONET

Local storm report, May 6, 1:12 AM CDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
112 AM CDT MON MAY 6 2002

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

1235 AM    WYNONA                    OK   65 MPH TSTM WIND GUST
05/06/02   OSAGE                          MESONET

Local storm report, May 6, 1:26 AM CDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
126 AM CDT MON MAY 6 2002

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

0110 AM    DEWEY                     OK   WIND DAMAGE
05/06/02   WASHINGTON                     TREES DAMAGED POWER LINES
                                          DOWN REPORTED BY EMERGENCY
                                          MGMT

Local storm report, May 6, 1:57 AM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
157 AM CDT MON MAY 6 2002

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

0125 AM    3 SE DELAWARE             OK   79 MPH TSTM WIND GUST
05/06/02   NOWATA                         MESONET

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 10:33 PM CDT	Severe Thunderstorm Warning	TSA	Osage	42 min
May 5, 11:00 PM CDT	Severe Thunderstorm Warning	TSA	Washington	45 min
May 5, 11:08 PM CDT	Severe Thunderstorm Warning	TSA	Nowata	52 min
May 5, 11:11 PM CDT	Severe Thunderstorm Warning	TSA	Osage	49 min
May 5, 11:27 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	48 min
May 6, 12:28 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	47 min
May 6, 1:52 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Tulsa	53 min
May 6, 2:09 AM CDT	Severe Thunderstorm Warning	TSA	Wagoner	51 min
May 6, 2:38 AM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	52 min
May 6, 2:47 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee	43 min
May 6, 2:51 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee	39 min
May 6, 3:01 AM CDT	Severe Thunderstorm Warning	TSA	Wagoner	44 min
May 6, 3:20 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee	55 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.