Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 211, NWS Tulsa, OK

June 27, 1997Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 27, 1997, 3:55 PM CDT for Sequoyah County, Oklahoma. It was in force for 50 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 27, 1997, 3:55 PM CDT (20:55 UTC)
Expired
Jun 27, 1997, 4:45 PM CDT
In force
50 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Sequoyah County, OK

What was reported inside it

TimeReportWhereRemark
Jun 27, 4:15 PM CDTThunderstorm WindSallisaw, 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.9 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 1997-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 341 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 1997-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
341 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
960 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

294 
WUUS1 KTUL 272055 RRA
SVRTUL
OKC135-272145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
355 PM CDT FRI JUN 27 1997
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  445 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL OKLAHOMA
 
   ...SEQUOYAH COUNTY
 
AT 355 PM...RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES SOUTHWEST OF
SALLISAW. THIS STORM WAS NEARLY STATIONARY.
 
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED
IN THE WARNED AREA.
 
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 Jun 27, 3:32 PM CDT, 23 minutes earlier.

Area forecast discussion, Jun 27, 3:32 PM CDT, 23 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
330 PM CDT FRI JUN 27 1997

DIURNAL SHRA/TSRA ACTVTY HAS ONCE AGAIN DVLPD ACRS MUCH OF FA THIS
AFTN AND XPCT MOST OF THIS TO DIMINISH AFT SUNSET AND DISSIPATE BY
ABT 03-04Z. AFT THIS EVE ATTN WL BE TO S/W CRNTLY MVG INTO WRN TX.

MDLS IN GENERAL AGREEMENT IN MVG THIS FEATURE SLOWLY ENEWD ACRS ERN
OK/NW AR THRU THE WKND. IT APRS THAT THIS SHLD ENHANCE POSSIBILITY
OF PRECIP BUT WL KEEP POPS IN CHC CAT. SOME INDICATIONS THAT BTR
CHC OF PRECIP WL BE IN SRN SCTNS SO WL HV SLGTLY HIER POPS THERE.

AS S/W CONTS OFF TO THE E WL END CHC OF PRECIP IN PARTS OF ERN OK
BEGINNING SAT NGT. BY SUN WL JUST HV SLGT CHC POPS IN NW AR. ALTHO
S/W IS FCST TO BE E OF ZNS BY 00Z MON THIS FEATURE MAY BE CLOSE
ENOUGH TO HELP GENERATE SOME SHRA/TSRA IN COMBINATION W/HEATING.
ELSEWHERE ACRS FA COULD CONT TO SEE SOME ISOLD AFTN/EVE SHRA/TSRA
ON SUN DEPENDING ON ANY REMAINING BNDRYS BUT BELIEVE CHC OF PRECIP
IS TOO SMALL TO MENTION ATTM.

IN XTNDED WL INTRODUCE SLGT CHC TSRA FOR WED. BELIEVE THAT MRF IS
TOO AGGRESSIVE IN BRING FNT INTO FA. BUT ECMWF DOES MV IT INTO SRN
KS. ALTHO IF UPR RDG IS AS STRG AS FCST THEN ATMOS MAY BE WELL
CAPPED BY THEN.

PRELIM NMBRS
TUL 72/91 72/91 1311     FSM 71/90 70/90 1431
MLC 70/90 70/90 2411     BVO 69/91 70/91 1311
FYV 67/86 66/86 1332     IDB 68/91 67/92 1431
BYV 66/87 65/86 2332

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

In the hours before

Special weather statement, Jun 27, 1:00 PM CDT, 2 hours 55 minutes before
ARZ001-002-010-011-019-029-OKZ054>076-281200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
100 PM CDT FRI JUN 27 1997

ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS THIS AFTERNOON AND THIS EVENING.

TEMPERATURES WARMING INTO THE UPPER 80S AND LOWER 90S THIS
AFTERNOON HAVE RESULTED IN A MODERATELY UNSTABLE AIRMASS OVER
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.  SCATTERED THUNDERSTORMS
ARE EXPECTED THROUGH THE AFTERNOON AND EARLY EVENING HOURS AS
SEVERAL WEAK SURFACE BOUNDARIES OVER THE AREA HELP TO FOCUS
DEVELOPMENT.  IN ADDITION TO THE WEAK SURFACE BOUNDARIES...A SLOW
MOVING UPPER LEVEL SYSTEM WAS MOVING ACROSS SOUTHWESTERN MISSOURI
EARLY THIS AFTERNOON.

ISOLATED PULSE SEVERE THUNDERSTORMS ARE POSSIBLE IN THIS TYPE OF
ENVIRONMENT...BUT WEAK WIND FIELDS WILL LIMIT THE SEVERE THREAT
TO DIME OR NICKEL SIZE HAIL AND WIND GUSTS UP TO 65 MPH.  THE WEAK
WIND FIELDS WILL ALSO CAUSE THE STORMS TO MOVE RATHER SLOWLY WHICH
WILL ENHANCE THE POSSIBILITY OF SOME LOCALIZED HEAVY RAIN WITH THE
STORMS.  THUNDERSTORM INTENSITIES WILL DIMINISH AFTER 8 PM AS
SURFACE TEMPERATURES GRADUALLY COOL.

EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD
CONTINUE TO MONITOR LOCAL CONDITIONS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 4:44 PM CDTSevere Thunderstorm WarningTSADelaware31 min
Jun 27, 5:48 PM CDTFlash Flood WarningTSARogers3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1997Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.