Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 368, NWS Norman, OK

June 18, 1998Jefferson County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 18, 1998, 6:43 PM CDT for Jefferson County, Stephens County, Oklahoma. It was in force for 47 min. 6 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 18, 1998, 6:43 PM CDT (23:43 UTC)
Expired
Jun 18, 1998, 7:30 PM CDT
In force
47 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Jefferson County, OK, Stephens County, OK

What was reported inside it

TimeReportWhereRemark
Jun 18, 6:55 PM CDTHail 0.88Loco, OK
Jun 18, 7:00 PM CDTHail 1.75Addington, OKSevere thunderstorms lasted for more than 4 hours around Addington. Ranchers near Addington witnessed hail as large as golf balls falling at least 10 times during those thunderstorms. The large hail damaged a barn roof and cracked a car windshield.
Jun 18, 7:18 PM CDTHail 0.75Addington, OK
Jun 18, 7:30 PM CDTHail 1.75Loco, OK
Jun 18, 7:35 PM CDTThunderstorm Wind 52Waurika, OK
Jun 18, 7:40 PM CDTThunderstorm Wind 75Ringling, OKMeasured by the Oklahoma Mesonet

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

Norman, OK (KOUN), launched 12:00Z, 11.7 hours before the alert went out and 110 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, Norman, OK at 12:00Z on 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1939 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, Norman, OK at 12:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 436 square meters per square second.1939587897Sfc1 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
1939 J/kg
Mixed-layer CIN
-299 J/kg
Mixed-layer LCL
1074 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
436 m²/s²
0-3 km storm-relative helicity
495 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 3:55 PM CDT, 2 hours 48 minutes earlier.

Area forecast discussion, Jun 18, 3:55 PM CDT, 2 hours 48 minutes before
FPUS3 KOKC 182100
AFDOKC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
355 PM CDT THU JUN 18 1998

FRONTAL BOUNDARY SHOWS UP WELL ON VISIBLE IMAGERY...EXTENDING FROM
NEAR KSWO TO KTIK TO KFDR. IT APPEARS THAT SURFACE BASED CONVECTION
MAY BE UNDERWAY IN LINCOLN/ERN PAYNE COUNTY AS RAPIDLY DEVELOPING
STORMS ARE SHOWING UP ON KTLX. WILL BE A CLOSE CALL AS TO WHETHER OR
NOT THEY GO SEVERE IN OUR AREA OR WAIT UNTIL THEY GET INTO THE TULSA
CWA.

THICKER AREA OF CU AND WEAK ECHOES ARE ALSO SHOWING UP OVER THE
WICHITA FALLS AREA. INSTABILITY WILL LIKELY HAVE TO BATTLE CAP A BIT
LONGER BEFORE STORMS START FIRING IN THIS AREA...HOWEVER...THINK THE
STORMS WILL DEVELOP WITHIN THE NEXT FEW HOURS. EXPECT PRECIP TO
BECOME MORE WIDESPREAD ACROSS THE E CNTRL ZONES TONIGHT AS CAP
CONTINUES TO WEAKEN.

FOR THE ZONES WILL KEEP POPS NEAR AND EAST OF CURRENT FRONTAL
POSITION. ALTHOUGH MODELS DISAGREE ON LOCATION WHERE FRONT WILL
STALL AND WASH OUT...THEY ALL AGREE THAT IT WILL STALL AND WASH OUT
THROUGH TOMORROW AFTERNOON. WINDS WILL BE KIND OF SQUIRRELLY
TONIGHT...BUT EXPECT THEM TO GO LIGHT AND VARIABLE OVER MOST OF THE
AREA AFTER MIDNIGHT. LEE TROF DEVELOPS DURING THE AFTERNOON
FRIDAY...GRADUALLY BRINGING SLY FLOW AREAWIDE. WILL CARRY LOW POPS
TOMORROW OVER THE SOUTHEAST FOR LINGERING ACTIVITY FROM
TONIGHT...AND WILL ALSO CARRY LOW POPS IN THE WEST FOR LATE TOMORROW
AFTERNOON FOR POSSIBLE TSTM DEVELOPMENT ALONG DRYLINE.

EXTENDED MODELS SHOW CHANCE OF PRECIP THROUGH TUESDAY AS ANOTHER
FRONT STALLS ACROSS THE AREA AND SLOWLY LIFTS NWD AS A WARM FRONT.
LOW CONFIDENCE IN DRASTIC CHANGES IN NOGAPS 850 TEMPS WITH LATEST
RUN...SO WILL NOT CHANGE TEMPS TOO MUCH FROM PREVIOUS FORECAST.

FCSTID = 17/MMT
OKC   70  95  72  96 /  20  10  20  20
HBR   65  99  73 100 /   0  20  20  20
SPS   72  97  74  99 /  20  20  20  20
GAG   58  95  67  97 /   0  20  20  20
PNC   68  95  72  97 /  10  10  20  20
DUA   75  92  76  95 /  40  20  20  20

.OUN...
OK...SVR TSTM WATCH UNTIL 10 PM ZONES 20-26-28>32.
TX...NONE.

In the hours before

Local storm report, Jun 18, 5:06 PM CDT, 1 hour 37 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
506 PM CDT THU JUN 18 1998

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

0502 PM    COMANCHTE                  OK   .88 INCH HAIL
06/18/98   STEPHENS                       REPORTED BY NWS COOP
                                          OBSERVER.

TL
Local storm report, Jun 18, 5:15 PM CDT, 1 hour 28 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
515 PM CDT THU JUN 18 1998

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

0510 PM    6 W VELMA                 OK   .75 INCH HAIL
06/18/98   STEPHENS                       REPORTED BY VELMA P.D.

TL
Local storm report, Jun 18, 5:32 PM CDT, 1 hour 11 minutes before
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Local storm report, Jun 18, 5:32 PM CDT, 1 hour 11 minutes before
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Local storm report, Jun 18, 5:55 PM CDT, 48 minutes before
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Local storm report, Jun 18, 5:55 PM CDT, 48 minutes before
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 7:16 PM CDTSevere Thunderstorm WarningOUNGreer, Jackson44 min
Jun 17, 7:43 PM CDTSevere Thunderstorm WarningOUNKiowa, Washita47 min
Jun 18, 4:52 PM CDTSevere Thunderstorm WarningOUNStephens53 min
Jun 18, 5:21 PM CDTSevere Thunderstorm WarningOUNGarvin54 min
Jun 18, 6:56 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Murray49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998Every 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.