Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 179, NWS Tulsa, OK

May 17, 2002Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 17, 2002, 5:01 AM CDT for Sequoyah County, Oklahoma. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 17, 2002, 5:01 AM CDT (10:01 UTC)
Expired: May 17, 2002, 5:45 AM CDT
In force: 44 min
Issued by: NWS Tulsa, OK
Area: Counties, with a storm outline in the text

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 55 km from the middle of the area, began a volume at 10:02 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.

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
May 17, 2:00 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 17, 2:30 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 10.0 hours before the alert went out and 179 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: 1170 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 171001
SVRTUL
OKC135-171045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
501 AM CDT FRI MAY 17 2002

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 545 AM CDT

* AT 501 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS ALONG
  A LINE EXTENDING FROM 9 MILES NORTH OF GORE TO 15 MILES SOUTHWEST
  OF GORE...MOVING EAST AT 40 MPH.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...SALLISAW...
  GANS...MULDROW...ROLAND...VIAN...GORE...BRUSHY AND MARBLE CITY.

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 3566 9514 3541 9510 3534 9451 3565 9452

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 May 17, 3:35 AM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, May 17, 3:35 AM CDT, 1 hour 26 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
335 AM CDT FRI MAY 17 2002

ACTIVE CONVECTIVE SYSTEM CONTINUES ACROSS EASTERN OKLAHOMA EARLY
THIS MORNING. THERE WILL BE A CONTINUED THREAT OF SEVERE WEATHER AND
FLASH FLOODING FOR REST OF MORNING...ESPECIALLY IN AREAS ALONG AND
SOUTH OF A TULSA TO FAYETTEVILLE AR LINE. WILL CONTINUE WITH
CATEGORICAL POPS AND A FLASH FLOOD WATCH FOR MOST OF THE FORECAST
AREA TODAY...WITH EMPHASIS ON THIS MORNING. RAIN WILL DIMINISH FROM
NORTHWEST TO SOUTHEAST THIS AFTERNOON AS INFLUENCE OF SHORTWAVE
MOVES EAST AND COOLER/DRIER AIR WORKS SOUTH BEHIND COLD FRONT.

COOL WEATHER...ESPECIALLY NIGHTTIME LOWS...WILL BE THE MAIN STORY
AFTER TODAYS CONVECTION. MOSTLY CLEAR AND DRY WEATHER EXPECTED AS
UPPER RIDGE BUILDS OVER ROCKIES TONIGHT INTO SATURDAY.

WILL CONTINUE WITH DRY WEATHER FORECAST FOR SUNDAY THROUGH WEDNESDAY
PERIOD. HOWEVER...WILL HAVE TO WATCH FOR SOUTHEAST MOVING
THUNDERSTORM COMPLEXES AS EARLY AS SUNDAY AS WARM ADVECTION BEGINS
IN WESTERN KANSAS AND HIGH PLAINS OF COLORADO.

FCSTID = 09
TUL   69  48  68  47 /  80   0   0  10
FSM   70  51  70  46 /  80   0   0  10
MLC   69  48  67  44 /  90   0   0  10
BVO   67  45  67  42 /  60   0   0  10
FYV   66  44  64  38 /  80   0   0  10
BYV   66  43  64  38 /  80   0   0  10
MIO   67  44  65  41 /  70   0   0  10
MKO   69  48  68  46 /  90   0   0  10
F10   69  48  68  47 /  80   0   0  10
HHW   73  51  70  48 /  90   0   0  10

.TSA...
AR...FLASH FLOOD WATCH UNTIL NOON CDT TODAY FOR ZONES ARZ001>002...
ARZ010>011...ARZ019>020...ARZ029.

OK...FLASH FLOOD WATCH UNTIL NOON CDT TODAY FOR ZONES OKZ054>076.

In the hours before

Local storm report, May 17, 1:09 AM CDT, 3 hours 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
109 AM CDT FRI MAY 17 2002

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

0100 AM    BROKEN ARROW              OK   .75 INCH HAIL
05/17/02   TULSA                          REPORTED BY TRAINED
                                          SPOTTER

Local storm report, May 17, 1:33 AM CDT, 3 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
133 AM CDT FRI MAY 17 2002

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

0130 AM    COWETA                    OK   60 MPH TSTM WIND GUST
05/17/02   WAGONER                        .88 INCH HAIL
                                          REPORTED BY SPOTTER.

Local storm report, May 17, 2:21 AM CDT, 2 hours 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
221 AM CDT FRI MAY 17 2002

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

0215 AM    11 SE PRYOR               OK   .75 INCH HAIL
05/17/02   MAYES                          REPORTED BY
                                          SPOTTER.

Special weather statement, May 17, 2:50 AM CDT, 2 hours 11 minutes before

OKZ054-055-059-060-064>066-170815-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
250 AM CDT FRI MAY 17 2002

SEVERE THUNDERSTORM WATCH #307 HAS BEEN REMOVED FROM THE FOLLOWING
AREAS...OSAGE...WASHINGTON...PAWNEE AND TULSA COUNTIES.

SEVERE THUNDERSTORM WATCH #309 HAS BEEN ISSUED FOR PARTS OF EASTERN
OKLAHOMA UNTIL 7 AM...INCLUDING CREEK...OKMULGEE...OKFUSKEE...
PUSHMATAHA AND CHOCTAW COUNTIES.

SEVERE THUNDERSTORM WATCH #308 HAS BEEN ISSUED FOR MOST OF THE REST
OF EASTERN OKLAHOMA UNTIL 7 AM.

Local storm report, May 17, 3:59 AM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
359 AM CDT FRI MAY 17 2002

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

0345 AM    BEARDEN                   OK   1.00 INCH HAIL
05/17/02   OKFUSKEE                       REPORTED BY TRAINED
                                          SPOTTER

Local storm report, May 17, 4:39 AM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
439 AM CDT FRI MAY 17 2002

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

0435 AM    EUFAULA                   OK   1.00 INCH HAIL
05/17/02   MCINTOSH                       REPORTED BY TRAINED
                                          SPOTTER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 8:50 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	55 min
May 16, 9:50 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	55 min
May 16, 9:55 PM CDT	Flash Flood Warning	TSA	Osage, Pawnee	2 hr
May 16, 11:03 PM CDT	Flash Flood Warning	TSA	Washington	3 hr
May 16, 11:12 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	48 min
May 16, 11:20 PM CDT	Severe Thunderstorm Warning	TSA	Osage	40 min
May 16, 11:34 PM CDT	Severe Thunderstorm Warning	TSA	Washington	41 min
May 16, 11:43 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	62 min
May 17, 12:26 AM CDT	Severe Thunderstorm Warning	TSA	Tulsa	49 min
May 17, 12:44 AM CDT	Severe Thunderstorm Warning	TSA	Creek	61 min
May 17, 1:04 AM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	56 min
May 17, 1:10 AM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	50 min
May 17, 1:18 AM CDT	Flash Flood Warning	TSA	Creek, Tulsa	3 hr
May 17, 1:49 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee	41 min
May 17, 1:58 AM CDT	Severe Thunderstorm Warning	TSA	Tulsa, Wagoner	47 min
May 17, 2:12 AM CDT	Severe Thunderstorm Warning	TSA	Creek	63 min
May 17, 2:21 AM CDT	Flash Flood Warning	TSA	Wagoner	3 hr
May 17, 2:34 AM CDT	Flash Flood Warning	TSA	Okmulgee	2 hr
May 17, 2:38 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Wagoner	67 min
May 17, 3:03 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee	57 min
May 17, 3:12 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	63 min
May 17, 3:15 AM CDT	Flash Flood Warning	TSA	Cherokee, Creek, Delaware, Mayes, Muskogee, Okmulgee and 2 more	3 hr
May 17, 3:37 AM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	53 min
May 17, 4:05 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	40 min
May 17, 4:39 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Muskogee, Pittsburg	51 min
May 17, 5:05 AM CDT	Severe Thunderstorm Warning	TSA	Latimer	40 min
May 17, 5:17 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	43 min
May 17, 5:23 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	52 min
May 17, 5:41 AM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	49 min
May 17, 6:10 AM CDT	Flash Flood Warning	TSA	Cherokee, Creek, Delaware, Mayes, Muskogee, Okmulgee and 2 more	6 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.