Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 503, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Dec 6, 1998, 1:10 PM CST for Delaware County, Oklahoma. It was in force for 35 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
- Dec 6, 1998, 1:10 PM CST (19:10 UTC)
- Expired
- Dec 6, 1998, 1:45 PM CST
- In force
- 35 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Delaware County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 6, 1:20 PM CST | Thunderstorm Wind 52 | Eucha, 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 |
|---|---|---|---|
| Dec 6, 8:30 AM CST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 7.2 hours before the alert went out and 105 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
- 77 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1031 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 270 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
836 WUUS54 KTSA 061911 RRA SVRTUL OKC041-061945- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 110 PM CST SUN DEC 6 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... DELAWARE COUNTY IN NORTHEASTERN OKLAHOMA * UNTIL 145 PM CST * AT 108 PM...RADAR DETECTED A SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF JAY...MOVING NORTHEAST AT 40 MPH. * SOME LOCATIONS AFFECTED INCLUDE... JAY...SYCAMORE AND EUCHA HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED IN THE WARNED AREA. BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.
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 Dec 6, 11:15 AM CST, 1 hour 55 minutes earlier.
Area forecast discussion, Dec 6, 11:15 AM CST, 1 hour 55 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 1115 AM CST SUN DEC 6 1998 COLD FRONT AT 17Z EXTENDS FROM CNTRL MO TO LOW N OF TUL...THEN SWD INTO SCNTRL OK. SCT TSRA CONTINUE ALONG AND JUST N OF COLD FRONT...WITH ADDITIONAL ACTIVITY DEVELOPING FARTHER S INTO SE OK/NRN TX ALONG DRYLINE. STRONG SPEED SHEAR COMBINED WITH ENHANCED LOW-LEVEL CONVERGENCE AND COOLING MID LEVEL TEMPS SHOULD WILL KEEP CONVECTION GOING INTO THE AFTERNOON...MAINLY ALONG AND N OF COLD FRONT. WILL KEEP MENTION OF SEVERE OVER NE OK FOR THIS AFTERNOON. 12Z MORNING SOUNDINGS SHOW STRONG ELEVATED CAP ACROSS NRN TX AND SRN OK...WHICH SHOULD KEEP CONVECTION MORE SCATTERED OVER SE OK THIS AFTERNOON. WILL KEEP A CLOSE EYE ON THIS HOWEVER. SURFACE WAVE IS PROGGD TO MOVE QUICKLY NE INTO SRN MO...WITH COLD FRONT SURGING THROUGH ABOUT THE NRN 1/2 OF ERN OK BY THIS AFTERNOON. MESONET SHOWS A GOOD 20-25 TEMPERATURE DROP BEHIND FRONT. SEVERAL STRONG WINDS GUSTS BOTH AHEAD AND BEHIND BOUNDARY...BUT THIS SHOULD ONLY LAST FOR A FEW HOURS SO NO ADVISORY IS PLANNED. UPDATED ZONES OUT ASAP. FCSTID = 18 .TUL... OK...NONE. AR...NONE.
In the hours before
Special weather statement, Dec 6, 12:43 PM CST, 27 minutes before
OKZ054>071-061945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 1243 PM CST SUN DEC 6 1998 SEVERE THUNDERSTORM WATCH NUMBER 899 HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES... IN NORTHEAST OKLAHOMA... OSAGE PAWNEE CREEK WASHINGTON A LINE OF SHOWERS AND THUNDERSTORMS HAS MOVED EAST OF THESE COUNTIES AND THE RISK OF SEVERE WEATHER HAS ENDED. SEVERE THUNDERSTORM WATCH NUMBER 899 REMAINS IN EFFECT FOR THE FOLLOWING COUNTIES UNTIL 200 PM... IN NORTHEAST OKLAHOMA... ADAIR CHEROKEE CRAIG DELAWARE MAYES MCINTOSH MUSKOGEE NOWATA OKFUSKEE OKMULGEE OTTAWA ROGERS TULSA WnAGONER
Special weather statement, Dec 6, 12:43 PM CST, 27 minutes before
OKZ054>071-061945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 1243 PM CST SUN DEC 6 1998 SEVERE THUNDERSTORM WATCH NUMBER 899 HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES... IN NORTHEAST OKLAHOMA... OSAGE PAWNEE CREEK WASHINGTON A LINE OF SHOWERS AND THUNDERSTORMS HAS MOVED EAST OF THESE COUNTIES AND THE RISK OF SEVERE WEATHER HAS ENDED. SEVERE THUNDERSTORM WATCH NUMBER 899 REMAINS IN EFFECT FOR THE FOLLOWING COUNTIES UNTIL 200 PM... IN NORTHEAST OKLAHOMA... ADAIR CHEROKEE CRAIG DELAWARE MAYES MCINTOSH MUSKOGEE NOWATA OKFUSKEE OKMULGEE OTTAWA ROGERS TULSA WnAGONER
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 6, 9:37 AM CST | Severe Thunderstorm Warning | TSA | Pawnee | 38 min |
| Dec 6, 9:51 AM CST | Severe Thunderstorm Warning | TSA | Osage | 39 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.