Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 312, NWS Tulsa, OK

June 13, 1998Pawnee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jun 13, 1998, 8:09 PM CDT for Pawnee County, Oklahoma. It was in force for 51 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: Jun 13, 1998, 8:09 PM CDT (01:09 UTC)
Expired: Jun 13, 1998, 9:00 PM CDT
In force: 51 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Pawnee County, OK

What was reported inside it

Time	Report	Where	Remark
Jun 13, 8:50 PM CDT	Hail 1.25	Pawnee, OK
Jun 13, 9:00 PM CDT	Hail 1.25	Pawnee, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 13, 4:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 137 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: 3674 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1597 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 16.9

Open this sounding in Storm Lab

The text

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

192 
WUUS54 KTSA 140108 RRA
SVRTUL
OKC117-140200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
809 PM CDT SAT JUN 13 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  PAWNEE COUNTY IN NORTHEASTERN OKLAHOMA

* UNTIL 900 PM CDT

* AT 805 PM...NATIONAL WEATHER SERVICE RADAR DETECTED THE LEADING
  EDGE OF A SEVERE THUNDERSTORM 20 MILES WEST-SOUTHWEST OF PAWNEE...
  MOVING EAST-NORTHEAST AT 25 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  PAWNEE
  SOONER LAKE

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

A TORNADO WATCH IS ALSO IN EFFECT. TORNADOES CAN DEVELOP SUDDENLY
FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS.

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 13, 3:50 PM CDT, 4 hours 19 minutes earlier.

Area forecast discussion, Jun 13, 3:50 PM CDT, 4 hours 19 minutes before

FPUS3 KTUL 132050
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
350 PM CDT SAT JUN 13 1998

PROBLEM(S) OF THE DAY:
WILL THERE BE SEVERE CONVECTION?
WILL STORMS BE SUPERCELLS OR NOT?

QUITE DISGUSTING OUTSIDE WITH TEMPS IN THE 90S AND DWPTS RANGING FM
75-80.  WEAK CU FIELD INDICATES THAT CAP CONTINUES TO HOLD ACRS
FA...ALTHO CONVECTION STARTING TO DVLP ALG DRYLINE RUNNING FM SCNTRL
KS INTO SW OK.  IN ADDITION...WM FNT HAS LIFTED OUT OF NE OK AND
CURRENTLY STRETCHES FM SE KS INTO NW AR.

BIG QUESTION IS WHAT TO DO WITH POPS.  18Z MESOETA SHOWS CONVECTIVE
DVLPMT BY 00Z FM SE KS INTO NW AR ALG AND NE OF WM FNT...WITH
ADDITIONAL ACTIVITY ACRS WRN OK DRYLINE.  PLAN ON CARRYING HIGHEST
POPS OVR FAR NE OK/NW AR CLOSEST TO EXPECTED POSN OF WM FNT...WITH
CHC POPS EVERYWHERE ELSE IN CASE DRYLINE ACTIVITY MIGRATES EWD.
GIVEN INCREDIBLE INSTABILITY...ANY TSRA THAT FORMS OR MVS INTO FA
SHUD BE SVR WITH SUPERCELLS PSBL PER DECENT DIRECTIONAL SHEAR ON AREA
PROFILERS.  SEE THE LATEST HAZARDOUS WEATHER OUTLOOK FOR ADDITIONAL
DETAILS.

SFC LOW MVS INTO SE NE/NW MO BY 12 SUN...WITH WK SFC BNDRY MVG INTO
CNTRL/ERN OK.  WL CARRY LO POPS ON SUN FOR MAINLY IN THE MRNG...WITH
DRIER LLVL AIR EXPECTED TO MV INTO FA BY AFTN.

WK SECONDARY BNDRY WL PUSH THRU AREA SUN NGT...WITH COOLER TEMPS
EXPECTED FOR MON.

UPR RDG STARTS TO BUILD BACK ACRS SRN PLAINS TUE THRU THU.  ECMWF
BRINGS BNDRY INTO ERN OK BY THU...BUT PLAN ON KEEPING FCST WARM AND
DRY FOR NOW.

FCSTID = 18
TUL   71  90  65  85 /  40  20   5  10
FSM   72  91  66  86 /  30  30   5  10
MLC   72  90  66  86 /  30  20   5  10
BVO   70  90  63  85 /  40  20   5  10
FYV   70  86  62  83 /  50  30   5  10
IDB   73  92  68  87 /  20  20   5  10
BYV   70  86  62  83 /  50  30   5  10
MIO   71  88  62  84 /  50  20   5  10
MKO   71  90  65  85 /  40  20   5  10
F10   71  90  65  85 /  40  20   5  10
HHW   73  91  68  87 /  20  20   5  10

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

---------------------
EXPERIMENTAL OUTPUT:

GENERAL WEATHER EXPECTED NEXT 24 HOURS: CONVECTIVE PRECIP
HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SUPERCELL
THUNDERSTORMS
NGM CONFIDENCE:  6 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  7 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 7 ON A SCALE OF 0 TO 10

In the hours before

Local storm report, Jun 13, 2:50 PM CDT, 5 hours 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
250 PM CDT SAT JUN 13 1998

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

1115 PM    DAYTON                    AR   .75 INCH HAIL
06/12/98   SEBASTIAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 7:59 PM CDT	Severe Thunderstorm Warning	TSA	Osage	31 min
Jun 13, 8:36 PM CDT	Tornado Warning	TSA	Pawnee	54 min
Jun 13, 9:26 PM CDT	Tornado Warning	TSA	Creek	49 min
Jun 13, 10:27 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa	33 min
Jun 13, 10:57 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	33 min
Jun 13, 11:33 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	27 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every severe thunderstorm warning in 1998

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.