Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 56, NWS Tulsa, OK

April 23, 2002Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 23, 2002, 3:12 AM CDT for Osage County, Oklahoma. It was in force for 63 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, 3:12 AM CDT (08:12 UTC)
Expired: Apr 23, 2002, 4:15 AM CDT
In force: 63 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Osage County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 08:12 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, 3:30 AM CDT	Hail 0.88	Pawhuska, 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, 8.2 hours before the alert went out and 97 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.

691 
WUUS54 KTSA 230812
SVRTUL
OKC113-230915-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 415 AM CDT

* AT 312 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3
  MILES SOUTH OF PEARSONIA...MOVING EAST AT 35 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...PAWHUSKA...
  HOMINY...AVANT...WYNONA...FAIRFAX...BARNSDALL...OKESA...
  PEARSONIA...FORAKER AND SKIATOOK.

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

LAT...LON 3689 9658 3650 9674 3620 9602 3674 9603

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 22, 9:10 PM CDT, 6 hours 2 minutes earlier.

Area forecast discussion, Apr 22, 9:10 PM CDT, 6 hours 2 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
910 PM CDT MON APR 22 2002

SCATTERED ELEVATED CONVECTION A POSSIBILITY LATER TONIGHT...MAINLY
AFTER 08Z. 40-45 LOW LEVEL JET NOSES INTO NE OK AT THAT TIME...BUT
FEEL ELEVATED STORMS COULD FIRE JUST ABOUT ANYWHERE ACROSS ERN OK.
CURRENT OBS/MESONET RUNNING A TAD WARMER THAN WHAT IS ADVERTISED.
CLOUDS EXPECTED TO BLANKET THE ENTIRE AREA AFTER 06Z...SO WILL GO
AHEAD RAISE MINIMUMS A TAD AND ADJUST RDF TEMPS TO ACCOUNT FOR THE
WARMER READINGS. WILL GO AHEAD AND BROADBRUSH CHANCE POPS ACROSS ALL
AREAS...THOUGH WILL INCREASE POPS SLIGHTLY ACROSS FAR ERN OK AND NW
AR WHERE BEST LIFT FROM THE LOW LEVEL JET SETS UP. ATMOSPHERIC
RECOVERY...OUTFLOW BOUNDARIES AND DEBRIS CLOUDS RESULTING FROM
CONVECTION THAT FIRES OVERNIGHT WILL CERTAINLY PLAY HAVOC ON
PINPOINTING WHERE ADDITIONAL CONVECTION DEVELOPS TOMORROW AFTERNOON.
WILL LEAVE CHANCE POPS AS THEY ARE FOR THE SECOND PERIOD.

UPDATED ZONE PACKAGE OUT BY 0220Z

FCSTID = 23

.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, 3:37 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
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.