Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 501, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Dec 6, 1998, 9:37 AM CST for Pawnee County, Oklahoma. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 6, 1998, 9:37 AM CST (15:37 UTC)
- Expired
- Dec 6, 1998, 10:15 AM CST
- In force
- 38 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Pawnee County, OK
The radar
The Tulsa radar (KINX), 103 km from the middle of the area, began a volume at 15:38 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.
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
Norman, OK (KOUN), launched 12:00Z, 3.6 hours before the alert went out and 137 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
- 500 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 209 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTUL 061537 RRA SVRTUL OKC117-061615- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 937 AM CST SUN DEC 6 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PAWNEE COUNTY IN NORTHEASTERN OKLAHOMA * UNTIL 1015 AM CST * AT 935 AM...RADAR DETECTED A SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF MARAMEC...MOVING NORTHEAST AT 40 MPH. * SOME LOCATIONS AFFECTED INCLUDE... MARAMEC...HALLETT AND BLACKBURN 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, 3:30 AM CST, 6 hours 7 minutes earlier.
Area forecast discussion, Dec 6, 3:30 AM CST, 6 hours 7 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
330 AM CST SUN DEC 6 1998
PROBLEMS OF THE DAY: COLD FRONT POSITION AND TIMING
WILL THERE BE SEVERE CONVECTION?
TEMPERATURES
THE POSITION AND MOVEMENT OF THE COLD FRONT WILL HOLD THE KEY TO THIS
FCST...ESPECIALLY IN THE FIRST PERIOD. AS OF 09Z...FRONT HAD PUSHED
INTO EXTREME NE OK BUT WAS NOT IN A VERY BIG HURRY. SFC WINDS OVER KS
HAVE SHIFTED TO NELY DIRECTION AND THERE'S NOT A BIG PUSH ON THE
FRONT ATTM. SHORT RANGE MODELS HAVE COME INTO BETTER AGREEMENT ON THE
FRONT AND ALL BRING IT THRU THE FORECAST AREA DURING THE DAY
TODAY...WITH FROPA AT TUL SOMEWHERE BETWEEN 16Z AND 18Z.
LAST MINUTE LOOK AT RADAR AND SFC OBS WILL DETERMINE FIRST PERIOD
TEMPS AND POPS...BUT WL HOLD ONTO MORNING MAXES AND STEADY OR SLOWLY
FALLING TEMPS WHERE FRONT PASSES EARLY...WITH ONLY SMALL DIURNAL
RANGES ELSEWHERE. MODELS HINT AT A CONTINUATION OF SOME POST FRONTAL
PRECIP AS SFC LOW DVLPS AND MOVES ACRS NE OK. WL NEED TO MAINTAIN
SOME POPS TO ACCOUNT FOR THIS AS WELL. 09Z TEMP AT TUL ONLY 7 DEGREES
BELOW RECORD HIGH FOR THIS DATE.
PROSPECTS FOR POSSIBLY SVR CONVECTION REMAIN A PROBLEM AS WELL. SO
FAR...ONLY ACTIVITY HAS BEEN OVER SE KS BEHIND THE FRONT WITH JUST A
COUPLE OF LTG STRIKES NOTED. CAP LKLY STILL IN PLACE SOUTH OF THE
FRONT...BUT AS UPR SYSTEM PULLS OUT AND COLDER AIR ALOFT SPREADS OVER
THE REGION...WUD STILL EXPECT TSTMS TO BREAK OUT ALG AND AHD OF THE
FRONT. IT APPEARS BEST CHC OF TSTMS WILL BE MAINLY SOUTH OF A FYV TO
MKO TO MLC LINE...ALTHO CONFIDENCE IN EXACTLY WHERE STORMS WL
INITIATE IS LOW. SHEAR PROFILES ARE IMPRESSIVE...AND EVEN WITH MEAGER
INSTABILITY PROGGED OVER THE AREA...STG WIND FIELDS WL PROBABLY BE
ENOUGH TO HELP GENERATE A FEW SVR TSTMS AHEAD OF THE FRONT. 6AM
HAZARDOUS WEATHER OUTLOOK WILL ADDRESS THIS IN MORE DETAIL.
QUIETER AND MORE SEASONAL WX WL RETURN WITH THE PASSAGE OF THE FRONT
...ALTHO WL NEED TO MAINTAIN SMALL POPS ON MONDAY AS NEXT SYSTEM
SWINGS ACROSS AND INTERACTS WITH EXISTING LLVL MSTR.
NO CHANGES TO EXTD.
FCSTID = 15
TUL ?? 33 43 29 / 50 10 30 10
FSM ?? 37 44 30 / 70 10 20 10
MLC ?? 36 44 32 / 70 10 20 10
BVO ?? 31 40 28 / 40 10 30 10
FYV ?? 32 42 28 / 60 10 20 10
IDB ?? 36 48 33 / 60 10 20 10
BYV ?? 32 42 28 / 60 10 20 10
MIO ?? 33 42 30 / 50 10 20 10
MKO ?? 34 43 30 / 50 10 20 10
F10 ?? 33 43 29 / 60 10 30 10
HHW ?? 36 48 33 / 60 10 20 10
.TUL...
OK...NONE.
AR...NONE.
--------------------
EXPERIMENTAL OUTPUT:
GENERAL WEATHER EXPECTED NEXT 24 HOURS: CONVECTIVE PRECIP
HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: SLIGHT CHANCE SEVERE
THUNDERSTORMS
NGM CONFIDENCE: 7 ON A SCALE OF 0 TO 10
ETA CONFIDENCE: 7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE: 7 ON A SCALE OF 0 T2O 10
FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10In the hours before
Special weather statement, Dec 6, 6:00 AM CST, 3 hours 37 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 600 AM CST SUN DEC 6 1998 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE TODAY ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. AN UPPER LEVEL WEATHER SYSTEM WAS MOVING INTO WESTERN TEXAS EARLY THIS MORNING. AT THE SURFACE...A COLD FRONT EXTENDED FROM NORTHWEST OKLAHOMA INTO CENTRAL MISSOURI. SURFACE LOW PRESSURE WAS LOCATED ALONG THE FRONT IN NORTHWEST OKLAHOMA. AS THE UPPER LEVEL SYSTEM MOVES NORTHEAST TODAY...THE SURFACE LOW WILL MOVE ACROSS NORTHEAST OKLAHOMA AND THE COLD FRONT WILL MOVE SOUTHWARD. THE SURFACE LOW WILL BE LOCATED NEAR TULSA AT MIDDAY...MOVING INTO MISSOURI THIS AFTERNOON. THE COLD FRONT WILL MOVE ACROSS MOST OF NORTHEAST OKLAHOMA BY EARLY AFTERNOON... MOVING INTO NORTHWEST ARKANSAS AND SOUTHEAST OKLAHOMA BY MID TO LATE AFTERNOON. THUNDERSTORM DEVELOPMENT IS EXPECTED THIS MORNING ACROSS EASTERN OKLAHOMA AS COLDER TEMPERATURES ALOFT WEAKEN THE CAP. THE STRONGEST THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG OR SOUTH OF THE FRONT... BUT SOME THUNDERSTORM ACTIVITY IS POSSIBLE NORTH OF THE FRONT. INSTABILITY WILL BE LIMITED...BUT STRONG WIND FIELDS ASSOCIATED WITH THE UPPER LEVEL SYSTEM APPEAR FAVORABLE FOR A FEW THUNDERSTORMS TO PRODUCE DAMAGING DOWNBURST WINDS. LARGE HAIL WILL ALSO BE A THREAT WITH ANY SEVERE THUNDERSTORMS TODAY. STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES... ESPECIALLY ACROSS SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS... SHOULD REMAIN ALERT TO THE POSSIBILITY OF SEVERE WEATHER TODAY. THE THREAT OF SEVERE WEATHER SHOULD DIMINISH AFTER 400 PM AS THE INFLUENCE OF THE UPPER SYSTEM MOVES EAST OF THE AREA. AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 100 PM TODAY. THIS OUTLOOK IS INTENDED TO PROVIDE GUIDANCE TO EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS CONCERNING TORNADOES...SEVERE THUNDERSTORMS...HIGH WIND EVENTS...FLOODING AND WINTER WEATHER. INFORMATION CONCERNING OTHER HAZARDS CAN BE FOUND IN OTHER PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN TULSA.
Special weather statement, Dec 6, 6:00 AM CST, 3 hours 37 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-071200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 600 AM CST SUN DEC 6 1998 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE TODAY ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. AN UPPER LEVEL WEATHER SYSTEM WAS MOVING INTO WESTERN TEXAS EARLY THIS MORNING. AT THE SURFACE...A COLD FRONT EXTENDED FROM NORTHWEST OKLAHOMA INTO CENTRAL MISSOURI. SURFACE LOW PRESSURE WAS LOCATED ALONG THE FRONT IN NORTHWEST OKLAHOMA. AS THE UPPER LEVEL SYSTEM MOVES NORTHEAST TODAY...THE SURFACE LOW WILL MOVE ACROSS NORTHEAST OKLAHOMA AND THE COLD FRONT WILL MOVE SOUTHWARD. THE SURFACE LOW WILL BE LOCATED NEAR TULSA AT MIDDAY...MOVING INTO MISSOURI THIS AFTERNOON. THE COLD FRONT WILL MOVE ACROSS MOST OF NORTHEAST OKLAHOMA BY EARLY AFTERNOON... MOVING INTO NORTHWEST ARKANSAS AND SOUTHEAST OKLAHOMA BY MID TO LATE AFTERNOON. THUNDERSTORM DEVELOPMENT IS EXPECTED THIS MORNING ACROSS EASTERN OKLAHOMA AS COLDER TEMPERATURES ALOFT WEAKEN THE CAP. THE STRONGEST THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG OR SOUTH OF THE FRONT... BUT SOME THUNDERSTORM ACTIVITY IS POSSIBLE NORTH OF THE FRONT. INSTABILITY WILL BE LIMITED...BUT STRONG WIND FIELDS ASSOCIATED WITH THE UPPER LEVEL SYSTEM APPEAR FAVORABLE FOR A FEW THUNDERSTORMS TO PRODUCE DAMAGING DOWNBURST WINDS. LARGE HAIL WILL ALSO BE A THREAT WITH ANY SEVERE THUNDERSTORMS TODAY. STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT AGENCIES... ESPECIALLY ACROSS SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS... SHOULD REMAIN ALERT TO THE POSSIBILITY OF SEVERE WEATHER TODAY. THE THREAT OF SEVERE WEATHER SHOULD DIMINISH AFTER 400 PM AS THE INFLUENCE OF THE UPPER SYSTEM MOVES EAST OF THE AREA. AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 100 PM TODAY. THIS OUTLOOK IS INTENDED TO PROVIDE GUIDANCE TO EMERGENCY MANAGEMENT AGENCIES AND STORM SPOTTER GROUPS CONCERNING TORNADOES...SEVERE THUNDERSTORMS...HIGH WIND EVENTS...FLOODING AND WINTER WEATHER. INFORMATION CONCERNING OTHER HAZARDS CAN BE FOUND IN OTHER PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN TULSA.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 6, 9:51 AM CST | Severe Thunderstorm Warning | TSA | Osage | 39 min |
| Dec 6, 1:10 PM CST | Severe Thunderstorm Warning | TSA | Delaware | 35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.