Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 469, NWS Tulsa, OK

October 17, 1998Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Oct 17, 1998, 2:11 PM CDT for Osage County, Oklahoma. It was in force for 49 min. 3 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Oct 17, 1998, 2:11 PM CDT (19:11 UTC)
Expired: Oct 17, 1998, 3:00 PM CDT
In force: 49 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Osage County, OK

The radar

The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 19:14 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

Time	Report	Where	Remark
Oct 17, 2:30 PM CDT	Thunderstorm Wind 61	Wolco, OK
Oct 17, 3:00 PM CDT	Thunderstorm Wind	Ochelata, OK	A barn was destroyed just east of Ochelata. Power poles were also snapped off.
Oct 17, 3:00 PM CDT	Thunderstorm Wind 52	Ochelata, 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, 7.2 hours before the alert went out and 196 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: 469 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 307 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

054 
WUUS54 KTSA 171912 RRA
SVRTUL
OKC105-113-147-172000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
211 PM CDT SAT OCT 17 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
     WASHINGTON COUNTY IN NORTHEAST OKLAHOMA
     NOWATA COUNTY IN NORTHEAST OKLAHOMA
     EASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 300 PM CDT

* AT 210 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES WEST OF
  AVANT...MOVING NORTHEAST AT 40 MILES PER HOUR.

* SOME LOCATIONS AFFECTED INCLUDE...  BARTLESVILLE...OKESA...
  NELAGONEY...TALLANT...PERSHING...BARNSDALL...WOLCO...WYNONA...
  AVANT...WATOVA...LENAPAH...DELAWARE...NOWATA...OCHELATA AND RAMONA

HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 70 MPH CAN BE EXPECTED IN
THE WARNED AREA.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

LAT...LON 3664 9635 3634 9636 3670 9542 3698 9544

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 Oct 17, 10:48 AM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Oct 17, 10:48 AM CDT, 3 hours 23 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1048 AM CDT SAT OCT 17 1998

NO UPDATE PLANNED THIS MORNING. RADAR INDICATING COVERAGE OF SHOWERS
AND THUNDERSTORMS INCREASING AS EXPECTED...AND CATEGORICAL POPS LOOK
GOOD FOR REST OF TODAY.

SQUALL LINE HAS DEVELOPED ALONG/JUST AHEAD OF THE COLD FRONT WHICH
EXTENDED FROM CENTRAL KS INTO WESTERN OKLAHOMA AT 15Z. FRONT SHOULD
CONTINUE ADVANCING EAST THIS AFTERNOON AND MOVE ACROSS MOST OF THE
FORECAST AREA TONIGHT. WILL HAVE TO WATCH FOR STRONG STORMS ALONG AND
AHEAD OF COLD FRONT THIS AFTERNOON AND TONIGHT...BUT SEVERE WEATHER
THREAT SHOULD BE LIMITED TO ISOLATED STRONG WIND GUSTS GIVEN LOW
INSTABILITY.  MAY ALSO BE SOME HEAVY RAINS WITH IMPRESSIVE MOISTURE
PROFILES FOR OCTOBER...BUT PROGRESSIVE NATURE OF SYSTEM EXPECTED TO
LIMIT EXTENT OF ANY EXCESSIVE RAINS.

FCSTID = 9
TUL   76  50  66  44 /  80  60  10   0
FSM   74  57  68  45 /  80  70  30   5
MLC   76  55  68  46 /  80  70  20  10
BVO   75  48  64  42 /  80  60  10   0
FYV   74  53  65  42 /  80  70  10   0
IDB   78  64  71  49 /  70  70  40  10
BYV   74  53  65  42 /  80  70  10   0
MIO   75  52  64  42 /  80  70  10   0
MKO   75  50  66  44 /  80  60  10   0
F10   75  50  66  44 /  80  60  10   0
HHW   78  64  71  49 /  70  70  40  10

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

In the hours before

Local storm report, Oct 17, 12:05 PM CDT, 2 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1205 PM CDT SAT OCT 17 1998

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

920 PM     3 S CAVE SPRINGS          AR   WIND DAMAGE
10/16/98   BENTON                         TREE BLOWN DOWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 16, 7:59 PM CDT	Severe Thunderstorm Warning	TSA	Adair	31 min
Oct 16, 8:31 PM CDT	Severe Thunderstorm Warning	TSA	Adair	29 min
Oct 17, 12:52 PM CDT	Severe Thunderstorm Warning	TSA	Osage	38 min
Oct 17, 1:28 PM CDT	Severe Thunderstorm Warning	TSA	Osage	32 min
Oct 17, 1:55 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	50 min
Oct 17, 2:11 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	49 min
Oct 17, 2:57 PM CDT	Tornado Warning	TSA	Osage, Tulsa, Washington	33 min
Oct 17, 3:07 PM CDT	Tornado Warning	TSA	Nowata, Rogers	53 min
Oct 17, 3:47 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Washington	43 min
Oct 17, 3:47 PM CDT	Severe Thunderstorm Warning	TSA	Osage	43 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; radar from the NEXRAD Level II archive.