Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 214, NWS Tulsa, OK

July 11, 2002Choctaw County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 11, 2002, 7:50 PM CDT for Choctaw County, Oklahoma. It was in force for 40 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: Jul 11, 2002, 7:50 PM CDT (00:50 UTC)
Expired: Jul 11, 2002, 8:30 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Choctaw County, OK

The radar

The Western Arkansas radar (KSRX), 162 km from the middle of the area, began a volume at 00:49 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
Jul 11, 8:00 PM CDT	Thunderstorm Wind 52 E	Hugo, 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 nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.8 hours before the alert went out and 229 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: 2549 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1277 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

110 
WUUS54 KTSA 120050
SVRTUL
OKC023-120130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
748 PM CDT THU JUL 11 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHOCTAW COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 830 PM CDT

* AT 748 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM      
  FROM NEAR HUGO TO NEAR MESSER...MOVING SOUTHEAST AT AROUND 5 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...HUGO...
  SAWYER...FORT TOWSON...MESSER AND KENT.

HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN
THE WARNED AREA. STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM
HAS PASSED.

LAT...LON 3417 9516 3416 9565 3387 9546 3395 9516

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 Jul 11, 2:50 PM CDT, 5 hours earlier.

Area forecast discussion, Jul 11, 2:50 PM CDT, 5 hours before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OKLAHOMA
250 PM CDT THU JUL 11 2002

EXTENSIVE CLOUD COVER HAS LIMITED INSTABILITY SOMEWHAT OVER MOST OF
THE FA THIS AFTERNOON. IT APPEARS TRUE SYNOPTIC FRONT REMAINS UP IN
KS...THOUGH OUTFLOW FROM PREVIOUS CONVECTION HAS RESULTED IN A
NORTHERLY COMPONENT TO THE WIND FOR MUCH OF THE DAY. WILL HAVE TO
WATCH FOR ADDITIONAL DEVELOPMENT LATE THIS AFTERNOON ALONG LINGERING
OUTFLOW BOUNDARIES...ESP. ACROSS FAR SE OK WHERE FULL SUN HAS
RESULTED IN DIFFERENTIAL HEATING THIS AFTERNOON. EXPECT FRONT TO GET
A GOOD PUSH TONIGHT AS VORT LOBE SWINGS FROM NORTH TO SOUTH TONIGHT
AND TOMORROW. WILL KEEP CHC POPS FOR TONIGHT AND TOMORROW...THEN
TAPER TO SLIGHT CHANCE FRI NIGHT AND SAT AS SURFACE FOCUS PUSHES
FURTHER SOUTH. MODELS HINT AT WEAK UPPER FEATURE BREAKING OFF FROM
MAIN LOW OVER THE WEEKEND...SO WILL KEEP LOW POPS REST OF THE
WEEKEND THROUGH MONDAY. ECMWF WEAKENS THIS UPPER FEATURE AND DRIFTS
IT FURTHER SOUTHWEST AND AWAY FROM THE FA TOWARDS THE MIDDLE PART OF
NEXT WEEK. WILL BE OPTIMISTIC FOR NOW AND LEAVE TUE-THU DRY.

TUL  68  87  66  89 /  40  30  20  20
FSM  70  88  67  89 /  40  30  20  20
MLC  70  89  67  89 /  40  30  20  20
BVO  67  85  65  89 /  40  30  20  20
FYV  66  83  63  85 /  40  30  20  20
BYV  65  82  64  84 /  40  30  20  20
MIO  68  85  65  87 /  40  30  20  20
MKO  70  87  66  89 /  40  30  20  20
F10  71  87  67  89 /  40  30  20  20
HHW  72  90  67  89 /  40  30  20  20

FORECAST ID= 23

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

In the hours before

Special weather statement, Jul 11, 2:00 PM CDT, 5 hours 50 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121200-

EASTERN OKLAHOMA / NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
200 PM CDT THU JUL 11 2002

...SCATTERED THUNDERSTORMS EXPECTED ACROSS ACROSS EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS THROUGH TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE
THIS AFTERNOON AND EVENING ALONG OUTFLOW BOUNDARIES FROM PREVIOUS
THUNDERSTORMS. WHILE MOST OF THESE THUNDERSTORMS SHOULD REMAIN BELOW
SEVERE LIMITS A COUPLE THUNDERSTORMS MAY BECOME BRIEFLY SEVERE WITH
WIND GUSTS TO 60 MPH THE MAIN THREAT. A FEW MORE THUNDERSTORMS WILL
BE POSSIBLE LATE TONIGHT AS A COLD FRONT CURRENTLY ACROSS CENTRAL
KANSAS PUSHES INTO NORTHERN OKLAHOMA.

RELATED GRAPHICAL INFORMATION CAN BE FOUND AT...
WWW.SRH.NOAA.GOV/TULSA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:09 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	36 min
Jul 12, 12:11 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Tulsa, Wagoner	49 min
Jul 12, 12:57 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	48 min
Jul 12, 1:02 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	58 min
Jul 12, 1:14 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	46 min
Jul 12, 1:57 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	63 min
Jul 12, 2:11 PM CDT	Severe Thunderstorm Warning	TSA	Delaware	49 min
Jul 12, 4:21 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	54 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.