Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 196, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at May 7, 1998, 7:40 PM CDT for Delaware County, Oklahoma. It was in force for 35 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
- May 7, 1998, 7:40 PM CDT (00:40 UTC)
- Expired
- May 7, 1998, 8:15 PM CDT
- In force
- 35 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
County Delaware County, OK
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.7 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
- 199 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1317 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
825 WUUS54 KTSA 080041 SVRTUL OKC041-080115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 740 PM CDT THU MAY 7 1998 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN DELAWARE COUNTY - NORTHEASTERN OKLAHOMA * UNTIL 815 PM CDT * AT 738 PM...STORM SPOTTERS REPORTED AND DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 1 MILE SOUTH OF JAY...MOVING SOUTHEAST AT 30 MPH. DIME TO NICKEL SIZE HAIL WAS REPORTED AT 733 PM 5 MILES WEST OF JAY. * SOME LOCATIONS AFFECTED INCLUDE... JAY COLCORD HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 0 MPH CAN BE EXPECTED IN THE WARNED AREA. BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH. WHEN THUNDERSTORMS APPROACH...TAKE COVER INSIDE A STURDY BUILDING. STAY AWAY FROM WINDOWS. TO PROTECT YOURSELF FROM LIGHTNING STAY OFF THE PHONE AND DONT USE HAND HELD ELECTRICAL APPLIANCES. MOTORISTS SHOULD NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. &
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 May 7, 4:00 PM CDT, 3 hours 40 minutes earlier.
Area forecast discussion, May 7, 4:00 PM CDT, 3 hours 40 minutes before
FPUS3 KTUL 072057 AFDTUL EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 400 PM CDT THU MAY 7 1998 THE ISOLATED SHOWERS AND THUNDERSTORMS WHICH POPPED UP THIS AFTERNOON OVER FAR NORTHEAST OKLAHOMA SHOULD DISSIPATE WITH THE SUNSET LEAVING THE NEXT CHANCE FOR RAIN FOR FRIDAY NIGHT. ALL THE MODELS EJECT SIGNICANT SHORTWAVE ENERGY NORTHEAST OVER THE AREA FRIDAY NIGHT AND SATURDAY AND SHIFT IT EAST SATURDAY NIGHT. THE SPEED OF THE MODELS IS SOMEWHAT DIFFERENT WITH THE AVN AND NGM THE FASTEST AND THE ETA THE SLOWEST. HAVE USED A BLEND OF BOTH OF THEM BRINGING IN PRECIP SOONER THAN THE ETA AND HOLDING ON TO IT LONGER THAN THE NGM AND AVN WOULD SUGGEST. AFTER SATURDAY NIGHT THE WEATHER SHOULD BE NICE. TEMPERATURE WISE...TOMORROW SHOULD BE LIKE TODAY WITH SATURDAY BEING COOLER WITH THE CLOUDS AND RAIN. SUNDAY WILL BE A LITTLE WARMER THAN SATURDAY DESPITE COOLER 8H TEMPS DUE TO SUNSHINE. HAVE FOLLOWED THE ECMWF FOR THE EXTENDED WHICH SHOWS UPPER RIDGING AND WARMING 8H TEMPS. THE FCSTID = 17 TUL 58 82 60 72 / 10 10 60 70 FSM 57 85 60 73 / 10 10 60 70 MLC 58 85 62 75 / 10 10 60 60 BVO 55 80 57 72 / 10 10 60 60 FYV 53 78 55 67 / 20 10 60 70 IDB 57 87 63 76 / 10 10 60 60 BYV 52 77 54 66 / 20 10 60 70 MIO 55 80 57 70 / 20 10 60 70 MKO 58 82 60 72 / 10 10 60 70 F10 58 83 60 73 / 10 10 60 70 HHW 58 87 64 76 / 10 10 60 60 .TUL... OK...NONE. AR...NONE. ABBAS
In the hours before
Special weather statement, May 7, 2:40 PM CDT, 5 hours before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-081200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE TULSA OK 240 PM CDT THU MAY 7 1998 ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND INTO THE EARLY EVENING ACROSS FAR NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS. HOWEVER...THEY ARE NOT EXPECTED TO BE SEVERE. ISOLATED THUNDERSTORMS HAVE DEVELOPED ALONG A WEAK WIND SHIFT LINE ACROSS FAR NORTHEAST OKLAHOMA THIS AFTERNOON. AN ADDITIONAL THUNDERSTORM OR TWO WILL BE POSSIBLE OVER PORTIONS OF FAR NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS...BUT RELATIVELY WEAK INSTABILITY SHOULD KEEP THUNDERSTORMS BELOW SEVERE LIMITS. ANY THUNDERSTORMS THAT DO FORM SHOULD DISSIPATE SHORTLY AFTER SUNSET.
Local storm report, May 7, 7:37 PM CDT, 3 minutes before
PRELIMARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
737 PM CDT THU MAY 7 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0733 PM 5 W JAY OK .88 INCH HAIL
05/07/98 DELAWARELocal storm report, May 7, 7:37 PM CDT, 3 minutes before
PRELIMARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
737 PM CDT THU MAY 7 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0733 PM 5 W JAY OK .88 INCH HAIL
05/07/98 DELAWARENearby
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.