Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 155, NWS Tulsa, OK

June 12, 1997Nowata County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 12, 1997, 4:14 AM CDT for Nowata County, Oklahoma. It was in force for 46 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: Jun 12, 1997, 4:14 AM CDT (09:14 UTC)
Expired: Jun 12, 1997, 5:00 AM CDT
In force: 46 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Nowata County, OK

The radar

The Tulsa radar (KINX), 70 km from the middle of the area, began a volume at 09:16 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
Jun 12, 1:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 9.2 hours before the alert went out and 162 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: 175 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1032 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 122 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 120915 RRA
SVRTUL
OKC105-121000-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
414 AM CDT THU JUN 12 1997
 
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  500 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST OKLAHOMA
 
   ...NOWATA COUNTY
 
AT 412 AM RADAR INDICATED A SEVERE STORM 2 MILES NORTHEAST OF WANN. THE
STORM WAS MOVING SOUTHEAST AT 285 MPH. THE TOWNS OF LENAPAH AND DELAWARE
ARE IN THE PATH OF THIS STORM.
 
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 70 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 12, 3:43 AM CDT, 31 minutes earlier.

Area forecast discussion, Jun 12, 3:43 AM CDT, 31 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
330 AM CDT THU JUN 12 1997

LINE OF TSRA CONTINUING TO PROGRESS TOWARDS NRN COUNTIES. EVOLUTION
OF STORM SCALE FEATURES OVER THE NEXT FEW HOURS WILL BE INTERESTING
AS LEADING EDGE OF MCS MERGES WITH PERSISTENT BAND OF ELEVATED TSRA
WHICH INITIATED ON LLJ JUST NORTH OF THE KANSAS BORDER. RADAR HAS
ALREADY ESTIMATED VERY HEAVY RAINFALL IN THESE COUNTIES...NRLY 3"
IN THE LAST 2 HRS. MCS SHOULD CONTINUE INTO NE OK THIS MORNING
BEFORE WEAKENING AFTER LLJ DECREASES. COULD SEE HEAVY RAINFALL OVER
NRN COUNTIES BEFORE MCS WEAKENS. WL LIKELY ISSUE FFA OVER FAR NRN
COUNTIES AS FFG IS FAIRLY LOW ALONG THE KS BORDER. WILL USE
CATEGORICAL WORDING FOR PRECIP OVER NE OK ZONES THIS MORNING
BECOMING PARTLY CLOUDY BY AFT. WILL ALSO LEAVE IN LIKELY POPS FOR
NW AR BUT KEEP ONLY SLT CHC FOR SE OK. EXPECT BULK OF PRECIP TO BE
GONE BY EARLY AFT.

WITH STG WLY COMPONENT JUST OFF THE SFC TODAY...MODELS REALLY
WARMING UP H8-H9 LAYER. LOCAL GUIDANCE USING ETA AND NGM MODEL
GRIDS SUGGESTS HI TEMPS IN THE MID-UPPER 90S IF WE GET FULL
SUNSHINE. DONT EXPECT TEMPS THAT WARM WITH CLOUDS AND PRECIP IN NE
HALF...COULD GET CLOSE IN SW HALF THOUGH.

HARD TO SAY WHERE ANY OUTFLOW BOUNDARIES WILL SET UP LATE THIS AFT
AND TONIGHT. REGARDLESS...WITH COLD FRONT APRCHG CENTRAL OK AND ERN
KS THIS AFT...WILL LIKELY SEE A REPEAT TONIGHT. STORMS SHOULD FIRE
IN THE AFT ALONG FRONT MUCH CLOSER THAN THEY DID WED. LLJ SHOULD BE
ABOUT AS STRONG AS IT WAS THIS MORNING. HAVE GONE ABOVE GUIDANCE
FOR POPS IN NE OK COUNTIES FOR TONIGHT.

DONT WANT TO JUMP TOO FAR AHEAD IN THE FOCUS OF THIS FCST BUT
MODELS INDICATING STRONGER MID-LEVEL FLOW BY FRI WITH SFC LOW/FRONT
...DEPENDING ON WHICH MODEL YOU BELIEVE...SOMEWHERE IN CWA. WILL
LIKELY SEE MORE STORMS FRI AFT.

EXTENDED MODELS INDICATING CHC/GOOD CHC OF TSRA THROUGH THE WEEKEND
AS POS TILTED UPR TROUGH LIFTS OUT OVER THE SRN/CNTRL PLAINS.

TUL ET 090/068 089/067 089 4542
FSM ET 090/067 090/066 090 4333
MLC BT 093/070 092/068 091 2342
BVO BT 090/067 089/064 089 +742
FYV WE 087/067 089/064 085 7432
IDB BB 093/068 095/067 092 1223
BYV WT 086/066 086/063 083 7332

.TUL...
OK...FLASH FLOOD WATCH ZONES 55>58...61>63.
AR...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 3:49 AM CDT	Severe Thunderstorm Warning	TSA	Craig	41 min
Jun 12, 3:51 AM CDT	Severe Thunderstorm Warning	TSA	Craig	39 min
Jun 12, 4:47 AM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers	43 min
Jun 12, 6:00 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	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; radar from the NEXRAD Level II archive.