Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 241, NWS Tulsa, OK

May 30, 2001Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 30, 2001, 9:50 PM CDT for Sequoyah County, Oklahoma. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 30, 2001, 9:50 PM CDT (02:50 UTC)
Expired: May 30, 2001, 10:30 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 32 km from the middle of the area, began a volume at 02:50 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.

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 30, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.8 hours before the alert went out and 180 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: 375 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 307 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 310251
SVRTUL
OKC135-310330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
950 PM CDT WED MAY 30 2001

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

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

* UNTIL 1030 PM CDT

* AT 950 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4
  MILES WEST OF GANS...MOVING EAST AT 20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...ROLAND...
  MULDROW AND GANS.

HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH CAN BE EXPECTED 
IN THE WARNED AREA.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
@
LAT...LON 3546 9481 3536 9477 3538 9446 3554 9445

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 30, 9:22 PM CDT, 28 minutes earlier.

Area forecast discussion, May 30, 9:22 PM CDT, 28 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
922 PM CDT WED MAY 30 2001

NEW SEVERE THUNDERSTORM WATCH JUST ISSUED FOR SE OK VALID UNTIL 100
AM.  THIS REPLACES THE TORNADO WATCH.

ISOLATED SUPERCELLS CONTINUE ALONG/JUST N OF OUTFLOW BOUNDARY ACROSS
SE OK.  DIRECTIONAL SHEAR REMAINS MARGINAL...BUT DEGREE OF
INSTABILITY WILL SUPPORT SEVERE STORMS FOR THE NEXT SEVERAL HOURS.
STORMS ARE SHOWING A GRADUAL SEWD DRIFT WHICH WILL PUT THEM INTO FAR
SE OK LATER THIS EVENING.

ISOLATED ACTIVITY FARTHER N ALONG COLD FRONT HAS BEEN MARGINALLY
SEVERE.

UPDATED ZONES OUT ASAP.

FCSTID = 18

.TSA...
AR...NONE.
OK...SEVERpE THUNDERSTORM WATCH UNTIL 100 AM CDT THURSDAY FOR ZONES
OKZ049...OKZ053...OKZ072>076.

In the hours before

Local storm report, May 30, 7:51 PM CDT, 1 hour 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
751 PM CDT WED MAY 30 2001

....DELAYED REPORTS....

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

1140 PM    BURBANK                   OK    WIND DAMAGE
05/29/01   OSAGE                           LARGE TREE LIMBS BROKEN

1150 PM    FORAKER                   OK    60 MPH TSTM GUST
05/29/01   OSAGE

1150 PM    FORAKER                   OK    1 INCH HAIL
05/29/01   OSAGE

0500 AM    6 SSW PETTIT              OK    FLOOD
05/30/01   CHEROKEE                        INDIAN ROAD FLOODED

0908 AM    BOX                       OK    FLOOD
05/30/01   SEQUOYAH                        FLOODED ROADS VCNTY BOX

0915 AM    HENRYETTA                 OK    FLOOD
05/30/01   OKMULGEE                        MANY AREA ROADS

0925 AM    OKEMAH                    OK    FLOOD
05/30/01   OKFUSKEE                        AREA ROADS

Local storm report, May 30, 9:06 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
906PM CDT WED MAY 30 2001

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

0825 PM    1 N HIGGINS               OK    1 INCH HAIL
05/30/01   LATIMER                         EMERGENCY MANAGEMENT
                                           REPORT

0845 PM    6 S WILBURTON             OK    1.75 INCH HAIL
05/30/01   LATIMER                         EMERGENCY MANAGEMENT
                                           REPORT

DRM

Local storm report, May 30, 9:33 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
933 PM CDT WED MAY 30 2001

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

0825 PM    1 N HIGGINS               OK    1 INCH HAIL
05/30/01   LATIMER                         REPORTED BY WILBURTON
                                           EOC.

0845 PM    6 S WILBURTON             OK    1.75 INCH HAIL
05/30/01   LATIMER                         REPORTED BY WILBURTON
                                           EOC.

0850 PM    KIOWA                     OK    1.25 INCH HAIL
05/30/01   PITTSBURG                       REPORTED BY MCALESTER
                    q                       EOC.

DRM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:31 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	44 min
May 30, 7:58 PM CDT	Tornado Warning	TSA	Latimer, Pittsburg	47 min
May 30, 8:40 PM CDT	Tornado Warning	TSA	Pittsburg	50 min
May 30, 8:42 PM CDT	Tornado Warning	TSA	Latimer	48 min
May 30, 9:11 PM CDT	Flash Flood Warning	TSA	Pittsburg	3 hr
May 30, 9:15 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	45 min
May 30, 9:26 PM CDT	Severe Thunderstorm Warning	TSA	Haskell	49 min
May 30, 9:28 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	47 min
May 30, 9:59 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	46 min
May 30, 10:15 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	45 min
May 30, 10:25 PM CDT	Flash Flood Warning	TSA	Pushmataha	3 hr
May 30, 10:38 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	52 min
May 30, 10:58 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	47 min
May 31, 12:02 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	43 min
May 31, 12:23 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	52 min
May 31, 12:56 AM CDT	Flash Flood Warning	TSA	Pushmataha	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning in 2001

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.