Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 110, NWS Tulsa, OK

May 7, 2002Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 7, 2002, 4:41 PM CDT for Washington County, Oklahoma. It was in force for 34 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 7, 2002, 4:41 PM CDT (21:41 UTC)
Expired: May 7, 2002, 5:15 PM CDT
In force: 34 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Washington County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 21:43 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 7, 5:07 PM CDT	Hail 0.75	Copan, 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.

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 7, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.7 hours before the alert went out and 189 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: 419 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 072141
SVRTUL
OKC147-072215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
440 PM CDT TUE MAY 7 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 515 PM CDT

* AT 440 PM CDT...DOPPLER RADAR INDICATED A DANGEROUS SEVERE   
THUNDERSTORM NEAR COPAN...MOVING EAST AT 35 MPH. GOLF BALL HAIL HAS 
BEEN REPORTED WITH THIS STORM. RADAR ALSO INDICATED SOME ROTATION.
PEOPLE NEAR ITS PATH SHOULD MOVE TO A SAFE PLACE NOW

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...COPAN.


LAT...LON 3699 9601 3685 9597 3682 9582 3700 9581

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 2:50 PM CDT	Severe Thunderstorm Warning	TSA	Osage	25 min
May 7, 3:10 PM CDT	Severe Thunderstorm Warning	TSA	Osage	50 min
May 7, 3:52 PM CDT	Severe Thunderstorm Warning	TSA	Osage	53 min
May 7, 4:03 PM CDT	Severe Thunderstorm Warning	TSA	Washington	42 min
May 7, 4:11 PM CDT	Severe Thunderstorm Warning	TSA	Nowata	64 min
May 7, 5:46 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	59 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.