Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 67, NWS Tulsa, OK

April 23, 2002Cherokee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 23, 2002, 5:52 AM CDT for Cherokee County, Oklahoma. It was in force for 38 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: Apr 23, 2002, 5:52 AM CDT (10:52 UTC)
Expired: Apr 23, 2002, 6:30 AM CDT
In force: 38 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Cherokee County, OK

The radar

The Tulsa radar (KINX), 57 km from the middle of the area, began a volume at 10:51 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
Apr 23, 6:00 AM CDT	Hail 0.75	Tahlequah, 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.

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
Apr 23, 2:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 10.9 hours before the alert went out and 155 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2397 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

114 
WUUS54 KTSA 231052
SVRTUL
OKC021-231130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
551 AM CDT TUE APR 23 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 630 AM CDT

* AT 551 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM      
  OVER HULBERT...MOVING SOUTHEAST AT 40 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...TAHLEQUAH...
  HULBERT AND ELDON.

DIME SIZE HAIL WAS REPORTED WITH THIS STORM IN HULBERT. HAIL TO THE 
SIZE OF DIMES CAN BE EXPECTED IN THE WARNED AREA. STAY INDOORS AND AWAY 
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3603 9514 3587 9524 3566 9480 3597 9480

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 Apr 23, 3:58 AM CDT, 1 hour 54 minutes earlier.

Area forecast discussion, Apr 23, 3:58 AM CDT, 1 hour 54 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
358 AM CDT TUE APR 23 2002

A LITTLE BUSY THIS MORNING WITH STORMS GOING OVER THE NORTH.
SURFACE LOW WAS LOCATED OVER THE OKLAHOMA PANHANDLE THIS MORNING
WITH WARM FRONT TRAILING ACROSS THE STATE TO THE NORTH OF
MCALESTER.  LOW LEVEL JET HAS RESULTED IN STRONG LIFT/WAA NORTH OF
THE FRONT AND STORMS BEGAN TO DEVELOP AROUND MIDNIGHT.  THIS
ACTIVITY WILL CONTINUE TO ORGANIZE THIS MORNING AND SLIDE TO THE
EAST SOUTHEAST INTO ARKANSAS.  MAY NOT SEE MUCH ADDITIONAL ACTIVITY
OVER THE AREA LATER TODAY...BUT WARM FRONT REMAINING IN THE
AREA...AND LEFTOVER BOUNDARIES FROM THIS MORNINGS ACTIVITY WILL
WARRANT CONTINUING CHANCE POPS FOR LATER THIS AFTERNOON.

MAY SEE ANOTHER LATE NIGHT ROUND OF STORMS BREAK OUT IN NORTHEAST
OKLAHOMA TONIGHT AS JET/FRONT/WAA PATTERN EXPECTED TO BECOME ACTIVE
AGAIN.  WILL THEN SEE A COLD FRONT MOVE ACROSS THE AREA DURING THE
DAY ON WEDNESDAY WITH THREAT OF SHOWERS AND THUNDERSTORMS ENDING FOR
A BIT.

FRONT WILL DRIFT ON TO THE SOUTH...THEN EXPECTED TO BEGIN RETURNING
NORTHWARD ON THURSDAY. SO MAY SEE SIMILAR PATTERN SETTING UP BY LATE
THURSDAY/THURSDAY NIGHT.  WILL KEEP CHANCE POPS MAINLY JUST IN THE
SOUTH FOR THURSDAY...THEN SPREAD ACROSS THE REMAINDER OF THE AREA
THURSDAY NIGHT INTO FRIDAY AND FRIDAY NIGHT.  NEXT FRONT SCHEDULED
FOR SATURDAY...SO EXTENDED FORECAST LOOKS GOOD FOR NOW AND WILL NOT
MAKES ANY BIG CHANGES THERE FOR NOW.

FCSTID = 4
TUL   81  62  73  43 /  70  30  10  10
FSM   78  61  78  45 /  70  30  30  10
MLC   82  63  77  45 /  50  30  10  10
BVO   80  60  70  40 /  80  30  10  10
FYV   75  58  72  40 /  80  30  30  10
BYV   75  58  72  40 /  80  30  30  10
MIO   78  60  72  40 /  80  30  10  10
MKO   80  63  76  45 /  70  30  10  10
F10   81  62  73  43 /  70  30  10  10
HHW   82  61  79  50 /  30  30  30  10

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

In the hours before

Local storm report, Apr 23, 5:43 AM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
543 AM CDT TUE APR 23 2002

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

0442 AM    LOCUST GROVE              OK   .75 INCH HAIL
04/23/02   MAYES                          REPORTED BY SPOTTERS

0448 AM    2 SW OOLOGAH              OK   .88 INCH HAIL
04/23/02   ROGERS                         REPORTED BY SPOTTERS

0511 AM    1 E LEACH                 OK   .75 INCH HAIL
04/23/02   DELAWARE                       REPORTED BY SPOTTERS

0257 AM    1 W JAY                   OK   .75 INCH HAIL
04/23/02   DELAWARE                       REPORTED BY DELAWARE
                                          COUNTY EOC

0331 AM    FAYETTEVILLE              AR   1.00 INCH HAIL
04/23/02   WASHINGTON                     REPORTED BY PUBLIC

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 2:43 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	47 min
Apr 23, 2:56 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes	34 min
Apr 23, 3:12 AM CDT	Severe Thunderstorm Warning	TSA	Osage	63 min
Apr 23, 3:37 AM CDT	Severe Thunderstorm Warning	TSA	Rogers, Washington	38 min
Apr 23, 3:45 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Mayes	45 min
Apr 23, 4:09 AM CDT	Severe Thunderstorm Warning	TSA	Rogers, Washington	51 min
Apr 23, 4:50 AM CDT	Severe Thunderstorm Warning	TSA	Adair	40 min
Apr 23, 4:51 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	39 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.