Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 429, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Sep 21, 1998, 9:35 PM CDT for Creek County, Tulsa County, Oklahoma. It was in force for 40 min. 1 report 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
- Sep 21, 1998, 9:35 PM CDT (02:35 UTC)
- Expired
- Sep 21, 1998, 10:15 PM CDT
- In force
- 40 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
Counties Creek County, OK, Tulsa County, OK
The radar
The Tulsa radar (KINX), 56 km from the middle of the area, began a volume at 02:37 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 |
|---|---|---|---|
| Sep 21, 9:55 PM CDT | Thunderstorm Wind | Sapulpa, OK | Trees and power lines were blown down near Sapulpa. |
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 |
|---|---|---|---|
| Sep 21, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 2.6 hours before the alert went out and 143 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
- 562 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 2148 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 16.1
The text
As transmitted, in the capitals the NWS used until 2016.
464
WUUS54 KTSA 220238 RRA
SVRTUL
OKC037-143-220315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
935 PM CDT MON SEP 21 1998
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR
WESTERN AND SOUTHERN TULSA COUNTY IN NORTHEAST OKLAHOMA
CREEK COUNTY IN NORTHEAST OKLAHOMA
* UNTIL 1015 PM CDT
* AT 935 PM CDT...RADAR INDICATED SEVERE THUNDERSTORMS ALONG A LINE
EXTENDING FROM MILFAY TO 8 MILES WEST OF KELLYVILLE TO 4 MILES WEST
OF MANNFORD...MOVING EAST AT 30 MILES PER HOUR.
* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... SAPULPA...
KELLYVILLE...MANNFORD...KIEFER...MOUNDS...DEPEW...SLICK...MILFAY...
BRISTOW...BROKEN ARROW...GLENPOOL...JENKS...BIXBY...SAND SPRINGS
AND TULSA
HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 70 MPH CAN BE
EXPECTED IN THE WARNED AREA.
THESE ARE DANGEROUS STORMS. IF YOU ARE NEAR THEIR PATH YOU SHOULD
PREPARE FOR VERY LARGE HAIL AND STRONG DAMAGING STRAIGHT LINE WINDS.
SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWSWhat 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 Sep 21, 9:15 PM CDT, 20 minutes earlier.
Area forecast discussion, Sep 21, 9:15 PM CDT, 20 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION...UPDATED... NATIONAL WEATHER SERVICE TULSA OK 915 PM CDT MON SEP 21 1998 KINX 88D INDICATING SEVERE STORMS MOVING INTO NORTHWESTERN ZONES AT THIS TIME. LATEST MESONET OBSERVATIONS INDICATING DEWPOINTS RUNNING IN THE LOWER 70S ACROSS MUCH OF EASTERN OKLAHOMA AT 9PM. 18Z ETA SUGGESTS CONVECTIVE ACTIVITY SHOULD CONTINUE OVERNIGHT. CURRENT SITUATION BEING HANDLED WELL BY ONGOING FORECAST SO WILL NOT UPDATE AT THIS TIME. HOWEVER...LINE OF STORMS EXTENDS DOWN TO THE SOUTHWEST PORTIN OF THE STATE WHICH COULD MAKE IT INTO OUR SOUTHEAST ZONES AFTER MIDNIGHT. IF THIS HAPPENS...WILL HAVE TO UPDATE. WILL CONTINUE TO MONITOR SITUATNION. HOWIESON FCSTID = 44 .TUL... OK...NONE. AR...NONE.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 8:38 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 52 min |
| Sep 21, 8:47 PM CDT | Tornado Warning | TSA | Osage | 28 min |
| Sep 21, 9:01 PM CDT | Severe Thunderstorm Warning | TSA | Creek | 44 min |
| Sep 21, 9:11 PM CDT | Tornado Warning | TSA | Osage | 34 min |
| Sep 21, 9:23 PM CDT | Severe Thunderstorm Warning | TSA | Pawnee | 52 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.