Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 295, NWS Tulsa, OK

July 23, 1997Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 23, 1997, 12:53 PM CDT for Sequoyah County, Oklahoma. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 23, 1997, 12:53 PM CDT (17:53 UTC)
Expired: Jul 23, 1997, 1:30 PM CDT
In force: 37 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Sequoyah County, OK

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.9 hours before the alert went out and 178 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: 2014 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 231753 RRA
SVRTUL
OKC135-231830-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1253 PM CDT WED JUL 23 1997
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL OKLAHOMA
 
   ...SEQUOYAH COUNTY
 
AT 1251 PM A NEARLY STATIONARY SEVERE THUNDERSTORM WAS LOCATED 4 MILES
EAST OF MARBLE CITY. DAMAGING DOWNBURST WINDS ARE LIKELY WITH THIS
STORM. IN ADDITION...A SECOND STORM WAS DEVELOPING NEAR MULDROW AND THIS
STORM COULD BECOME SEVERE.
 
 
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 65 MPH CAN BE EXPECTED
IN THE WARNED AREA.
 
DURING THE STORM MOVE INDOORS AND STAY AWAY FROM WINDOWS.
TO PROTECT YOURSELF FROM LIGHTNING DO NOT USE THE TELEPHONE
OR HAND HELD ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY.
MOTORISTS SHOULD BE ALERT FOR WATER ON ROADWAYS AND NEVER
DRIVE ONTO A FLOODED `ROAD.
 
KEEP TUNED TO THIS STATION FOR THE LATEST WEATHER BULLETINS.

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 23, 10:58 AM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 23, 10:58 AM CDT, 1 hour 55 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1055 AM CDT WED JUL 23 1997

AREA SOUNDINGS THIS MORNING LOOK MUCH LIKE THE PAST SEVERAL
DAYS...VALUES NEAR PEAK HEATING SHOWING LITTLE CAP...CAPES TO
AROUND 2000 J/KG AND A VERTICLE THETA-E PROFILE FAVORABILE FOR
MICROBURSTS.  THEREFORE WE WILL LIKELY AGAIN HAVE ISOLATED SEVERE
STORMS IN OUR CWA THIS AFTERNOON AND EVENING.  THE WIND PROFILE IS
WEAK SO CELL MOTIONS WILL BE SLOW.  LOW-LEVEL FLOW IS VERY WEAK SO
THE CELLS WILL LIKELY BE VERY QUICK UP AND DOWN WITH ONLY LIMITED
REDEVELOPMENT ON THE SUBSEQUENT BOUNDARIES...THUS KEEPING COVERAGE
IN THE SCATTERED CATEGORY AT BEST.

FEATURES TO FOCUS THE CONVECTION ARE SUBTLE...WATER VAPOR PICS THIS
MORNING SHOW THE UPPER LOW IN NE TEXAS WORKING SLOWLY WEST.  THE
DIFFLUENT FLOW AREAS SEEN IN THE LOOPS AND THE DIVERGENCE IN
GRIDDED DATA FIELDS SUGGEST THE BEST UPWARD MOTION WITH THIS SYSTEM
WILL BE TO THE EAST OF THE CENTER IN EXTREME SE OKLAHOMA...NE
TEXAS...SRN ARKANSAS AND N LOUISIANA.  AT THE SURFACE A WEAK
CONFLUENCE LINE WAS RESULTING IN SOME MOISTURE CONVERGENCE FROM
OSAGE COUNTY TO SOUTH OF FORT SMITH.  HOWEVER OROGRAPHIC LIFT IN
THE HILLS OF SE OKLAHOMA AND NW ARKANSAS WILL BE THE MOST LIKELY
SPOTS FOR STORM DEVELOPMENT.

THE CURRENT ZONES HAVE THESE IDEAS COVERED.  WILL MAKE ONLY MINOR
TWEAKS AS NECESSARY THIS AFTERNOON TO FOLLOW STORM TRENDS.

/8

.TUL...
OK...NONE.
AR...NONE.

In the hours before

Local storm report, Jul 23, 10:00 AM CDT, 2 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
10 AM CDT WED JUL 23 1997

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

0745 PM    3 NW GREENWOOD            AR   WIND DAMAGE
07/22/97   SEBASTIAN                      TREE DOWNED

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:25 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	35 min
Jul 23, 2:36 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	54 min
Jul 23, 2:53 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	52 min
Jul 23, 4:43 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore	47 min
Jul 23, 5:45 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	30 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1997 Every severe thunderstorm warning in 1997

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.