Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 467, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Oct 17, 1998, 1:55 PM CDT for Nowata County, Washington County, Oklahoma. It was in force for 50 min. 1 report 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, 1:55 PM CDT (18:55 UTC)
- Expired
- Oct 17, 1998, 2:45 PM CDT
- In force
- 50 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Nowata County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 94 km from the middle of the area, began a volume at 18:56 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, 2:05 PM CDT | Thunderstorm Wind | Copan, OK | Large tree limbs were blown down in Copan. |
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, 6.9 hours before the alert went out and 178 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
941
WUUS54 KTSA 171857 RRA
SVRTUL
OKC105-147-171945-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
155 PM CDT SAT OCT 17 1998
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR
NORTHERN WASHINGTON COUNTY IN NORTHEAST OKLAHOMA
NORTHERN NOWATA COUNTY IN NORTHEAST OKLAHOMA
* UNTIL 245 PM CDT
* AT 155 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES WEST OF
COPAN...MOVING EAST AT 40 MILES PER HOUR.
* SOME LOCATIONS AFFECTED INCLUDE...SOUTH COFFEYVILLE...WANN AND
COPAN
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN
THE WARNED AREA.
BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
LAT...LON 3706 9602 3680 9604 3688 9543 3720 9550What 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 7 minutes earlier.
Area forecast discussion, Oct 17, 10:48 AM CDT, 3 hours 7 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, 1 hour 50 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 DOWNThe 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, 2:11 PM CDT | Severe Thunderstorm Warning | TSA | Nowata, Washington | 49 min |
| Oct 17, 2:11 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 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, 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; radar from the NEXRAD Level II archive.