Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 62, NWS Tulsa, OK

April 23, 2002Rogers County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 23, 2002, 4:09 AM CDT for Rogers County, Washington County, Oklahoma. It was in force for 51 min. 2 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: Apr 23, 2002, 4:09 AM CDT (09:09 UTC)
Expired: Apr 23, 2002, 5:00 AM CDT
In force: 51 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

Counties Rogers County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 47 km from the middle of the area, began a volume at 09:12 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, 4:10 AM CDT	Hail 0.88	Ochelata, OK
Apr 23, 4:48 AM CDT	Hail 0.88	Oologah, 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

Lamont, OK (KLMN), launched 00:00Z, 9.2 hours before the alert went out and 152 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: 2841 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 343 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.

724 
WUUS54 KTSA 230909
SVRTUL
OKC131-147-231000-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROGERS COUNTY IN NORTHEAST OKLAHOMA
  SOUTHERN WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 500 AM CDT

* AT 408 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  OCHELATA...MOVING EAST AT 40 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...RAMONA...
  OCHELATA...FOYIL...OOLOGAH...TALALA AND CHELSEA.

HAIL TO THE SIZE OF GOLFBALLS CAN BE EXPECTED IN THE WARNED AREA. STAY
INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3670 9604 3651 9605 3632 9540 3658 9536

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, 11 minutes earlier.

Area forecast discussion, Apr 23, 3:58 AM CDT, 11 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.

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, 4:50 AM CDT	Severe Thunderstorm Warning	TSA	Adair	40 min
Apr 23, 4:51 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	39 min
Apr 23, 5:52 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee	38 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.