Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 249, NWS Tulsa, OK

July 15, 1997Cherokee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 15, 1997, 6:23 AM CDT for Cherokee County, Oklahoma. It was in force for 37 min. 2 reports 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
Jul 15, 1997, 6:23 AM CDT (11:23 UTC)
Expired
Jul 15, 1997, 7:00 AM CDT
In force
37 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Cherokee County, OK

The radar

The Tulsa radar (KINX), 59 km from the middle of the area, began a volume at 11:24 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

TimeReportWhereRemark
Jul 15, 6:30 AM CDTHail 1Park Hill, OK
Jul 15, 6:35 AM CDTHail 0.75Tahlequah, OKA severe thunderstorm produced quarter size hail at Park Hill and dime size hail 3 miles south of Tahlequah.

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 00:00Z, 11.4 hours before the alert went out and 154 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 00:00Z on 1997-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3730 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1997-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
3730 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1063 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
19 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.

000 
TTAA00 KTUL 151124 RRA
SVRTUL
OKC021-151200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
623 AM CDT TUE JUL 15 1997
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  700 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL OKLAHOMA
 
   ...SOUTHERN CHEROKEE COUNTY
 
AT 622 AM WEATHER RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTHEAST
OF TAHLEQUAH. MOVEMENT WAS TO THE SOUTH AT 15 MILES AN HOUR.
 
 
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 Jul 15, 4:39 AM CDT, 1 hour 44 minutes earlier.

Area forecast discussion, Jul 15, 4:39 AM CDT, 1 hour 44 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
435 AM CDT TUE JUL 15 1997

SCATTERED LIGHT SHOWERS ARE OCCURRING ACROSS THE FORECAST AREA IN
THE DEEP MOISTURE LEFT OVER FROM LAST EVENINGS CONVECTIVE DEBRIS.
THESE SHOWERS SHOULD DISSIPATE THIS MORNING AS DEEP MIXING BEGINS.

A WEAKENING COLD FRONT WILL DROP SOUTH THROUGH EAST SECTIONS OF OUR
AREA...BRINGING LOWER THETA-E AIR INTO NORTHWEST ARKANSAS AND
EXTREME NORTHEAST OKLAHOMA TODAY.  THIS BOUNDARY WILL BE
INCREASINGLY DIFFUSE WEST OF THE ARKANSAS LINE AND LITTLE IN THE
WAY OF AN AIRMASS CHANGE IS LIKELY FOR WEST SECTIONS OF OUR AREA.
DURING THE AFTERNOON THE CAP IS EXPECTED TO BE WEAK SO SCATTERED
STORMS ARE EXPECTED IN WEST CENTRAL ARKANSAS AND PARTS OF SOUTHEAST
OKLAHOMA WHERE LIFT ALONG THE BOUNDARY WILL BE AIDED BY THE HIGHER
TERRAIN.  ALSO CAN NOT RULE OUT A STORM ANYWHERE WHERE SURFACE
DEWPOINTS DO NOT FALL AS THE CAP WILL BE WEAK AND A WEAK UPPER
DISTURBANCE NOW AIDING NEWLY DEVELOPED STORMS IN SW KS AND NW OK
MOVES INTO THE AREA.  WILL HOLD POPS OUT OF FAR NORTHWEST ARKANSAS
AND EXTREME NORTHEAST OKLAHOMA TODAY BE CAUSE OF THE WEAK LOW-LEVEL
DRY ADVECTION THERE.  WILL SHAVE A LITTLE OFF THE NGM MOS TEMPS FOR
TODAY DUE TO SOME INCREASE IN CLOUDS AS COMPARED TO YESTERDAY.

ANY SHOWERS OR STORMS IN THE AREA THIS EVENING SHOULD DIE OFF AFTER
SUNSET...HOWEVER ACTIVITY MAY PERSIST SOME TO THE WEST AS A WK
SHRTWV APPROACHES AND WILL LEAVE SOME LOW POPS IN WEST SECTIONS FOR
THAT REASON.  OPTED TO GO ABOVE GUIDANCE FOR POPS ON WEDNESDAY WITH
THE MODELS SHOWING A MID-LEVEL SHORT WAVE CONTINUING TO APPROACH
FROM THE NORTHWEST...THE NEGATIVE FOR POPS WILL BE SOME INCREASE IN
CAP STRENGTH SO KEPT POPS IN CHANCE CATEGORY.

TUL 093/073 094/076 095 3131
FSM 094/071 096/072 097 3131
MLC 097/073 096/072 098 3131
BVO 092/071 093/073 095 3131
FYV 090/067 091/068 093 1-31
IDB 098/072 095/071 096 4231
BYV 089/066 090/B067 092 --21

/8

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

In the hours before

Special weather statement, Jul 15, 6:00 AM CDT, 23 minutes before
ARZ001-002-010-011-019-029-OKZ054>076-161100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT TUE JUL 15 1997

...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND
   THIS EVENING OVER WEST CENTRAL ARKANSAS AND PARTS OF EASTERN
   OKLAHOMA...

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WERE MOVING TO THE
SOUTH OVER EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS EARLY THIS
MORNING.  THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE...AND
SHOULD DIMINISH THROUGH THE MORNING.  OTHER STORMS WERE OVER
NORTHWEST OKLAHOMA EARLY THIS MORNING...BUT ARE EXPECTED TO
REMAIN TO THE WEST.

MEANWHILE...A FRONTAL BOUNDARY WAS CONTINUING TO WEAKEN OVER THE
AREA.  BY THIS AFTERNOON THE REMNANTS OF THE BOUNDARY ARE EXPECTED
TO STRETCH FROM WEST CENTRAL ARKANSAS INTO EASTERN OKLAHOMA.  THE
ATMOSPHERE OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL ALSO
CONTINUE TO BE VERY UNSTABLE THROUGH THE DAY AS TEMPERATURES BY
THIS AFTERNOON ONCE AGAIN CLIMB WELL INTO THE 90S.

SCATTERED THUNDERSTORMS WILL BE POSSIBLE AGAIN THIS AFTERNOON AND
THIS EVENING...MAINLY OVER WEST CENTRAL ARKANSAS...AND ALL BUT THE
EXTREME NORTHEAST CORNER OF EASTERN OKLAHOMA.  GIVEN THE DEGREE OF
INSTABILITY PRESENT...A FEW OF THE STORMS MAY BRIEFLY BECOME SEVERE
WITH THE PRIMARY THREAT BEING LARGE HAIL AND STRONG STRAIGHT-LINE
WINDS.  ANY STORMS THAT FORM WILL LIKELY DISSIPATE NEAR OR SHORTLY
AFTER SUNSET AS THE LOSS OF HEATING FROM THE SUN WILL HELP TO
STABILIZE THE ATMOSPHERE.

EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD
MONITOR THE LATEST WEATHER CONDITIONS AND BE READY FOR POSSIBLE
ACTIVATION THIS AFTERNOON AND THIS EVENING.  AN UPDATED
THUNDERSTORM OUTLOOK WILL BE ISSUED AROUND 1 PM.
Special weather statement, Jul 15, 6:05 AM CDT, 18 minutes before
ARZ001-002-010-011-019-029-OKZ054>076-161100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT TUE JUL 15 1997

...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND
   THIS EVENING OVER WEST CENTRAL ARKANSAS AND PARTS OF EASTERN
   OKLAHOMA...

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WERE MOVING TO THE
SOUTH OVER EASTERN OKLAHOMA AND WEST CENTRAL ARKANSAS EARLY THIS
MORNING.  THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE...AND
SHOULD DIMINISH THROUGH THE MORNING.  OTHER STORMS WERE OVER
NORTHWEST OKLAHOMA EARLY THIS MORNING...BUT ARE EXPECTED TO
REMAIN TO THE WEST.

MEANWHILE...A FRONTAL BOUNDARY WAS CONTINUING TO WEAKEN OVER THE
AREA.  BY THIS AFTERNOON THE REMNANTS OF THE BOUNDARY ARE EXPECTED
TO STRETCH FROM WEST CENTRAL ARKANSAS INTO EASTERN OKLAHOMA.  THE
ATMOSPHERE OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL ALSO
CONTINUE TO BE VERY UNSTABLE THROUGH THE DAY AS TEMPERATURES BY
THIS AFTERNOON ONCE AGAIN CLIMB WELL INTO THE 90S.

SCATTERED THUNDERSTORMS WILL BE POSSIBLE AGAIN THIS AFTERNOON AND
THIS EVENING...MAINLY OVER WEST CENTRAL ARKANSAS...AND ALL BUT THE
EXTREME NORTHEAST CORNER OF EASTERN OKLAHOMA.  GIVEN THE DEGREE OF
INSTABILITY PRESENT...A FEW OF THE STORMS MAY BRIEFLY BECOME SEVERE
WITH THE PRIMARY THREAT BEING LARGE HAIL AND STRONG STRAIGHT-LINE
WINDS.  ANY STORMS THAT FORM WILL LIKELY DISSIPATE NEAR OR SHORTLY
AFTER SUNSET AS THE LOSS OF HEATING FROM THE SUN WILL HELP TO
STABILIZE THE ATMOSPHERE.

EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS SHOULD
MONITOR THE LATEST WEATHER CONDITIONS AND BE READY FOR POSSIBLE
ACTIVATION THIS AFTERNOON AND THIS EV>ENING.  AN UPDATED
THUNDERSTORM OUTLOOK WILL BE ISSUED AROUND 1 PM.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 2:09 PM CDTSevere Thunderstorm WarningTSAHaskell36 min
Jul 15, 3:17 PM CDTSevere Thunderstorm WarningTSAPittsburg43 min
Jul 15, 4:14 PM CDTSevere Thunderstorm WarningTSAMcIntosh46 min
Jul 15, 5:05 PM CDTSevere Thunderstorm WarningTSAOkfuskee25 min
Jul 15, 5:09 PM CDTSevere Thunderstorm WarningTSAMcIntosh36 min
Jul 15, 5:14 PM CDTSevere Thunderstorm WarningTSAOkmulgee31 min
Jul 15, 6:08 PM CDTSevere Thunderstorm WarningTSAOkfuskee37 min
Jul 15, 6:49 PM CDTSevere Thunderstorm WarningTSARogers, Wagoner41 min

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; radar from the NEXRAD Level II archive.