Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 232, NWS Tulsa, OK

May 17, 1999Nowata County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 17, 1999, 1:14 AM CDT for Nowata County, Oklahoma. It was in force for 46 min. No storm report in the archive falls 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.

The facts

Issued
May 17, 1999, 1:14 AM CDT (06:14 UTC)
Expired
May 17, 1999, 2:00 AM CDT
In force
46 min
Issued by
NWS Tulsa, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Nowata County, OK

The radar

The Tulsa radar (KINX), 92 km from the middle of the area, began a volume at 06:14 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.

IssuedProductOfficeLasted
May 17, 12:30 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.2 hours before the alert went out and 170 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.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 1999-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1195 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 1999-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1195 J/kg
Mixed-layer CIN
-162 J/kg
Mixed-layer LCL
1564 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
275 m²/s²
Significant tornado parameter
0.1
Supercell composite
7.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

999 
WUUS54 KTSA 170616 RRA
SVRTUL
OKC105-170700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
114 AM CDT MON MAY 17 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NOWATA COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 200 AM CDT

* AT 114 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES SOUTH OF WANN...MOVING NORTHEAST AT 40
  MPH.

HAIL TO THE SIZE OF NICKELS 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 3679 9593 3672 9572 3729 9534 3739 9562

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 16, 10:00 PM CDT, 3 hours 14 minutes earlier.

Area forecast discussion, May 16, 10:00 PM CDT, 3 hours 14 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1000 PM CDT SUN MAY 16 1999

A LINE OF SHOWERS AND THUNDERSTORMS AHEAD OF THE COLD FRONT LOCATED
FROM NORTHEAST TO SOUTHEAST KANSAS MOVING TO THE NORTHEAST...SECOND
AREA OF STORMS WHICH DEVELOPED AHEAD OF THE DRY LINE NOW MOVING
ACROSS CENTRAL OKLAHOMA.  EXPECT THE STORMS IN CENTRAL OKLAHOMA WILL
WEAKEN SOME AS THEY APPOROACH OUR FORECAST AREA AFTER MIDNIGHT...BUT
SOME MAY STILL BE MARGINAL AS THEY MOVE INTO NORTHEAST OKLAHOMA.
TORNADO WATCH 279 IN EFFECT FOR OSAGE AND PAWNEE COUNTIES UNTIL 4 AM
AND EXPECT MORE WATCHES FOR FORECAST AREA BEFORE NIGHT IS THROUGH AS
COLD FRONT WILL SLOWLY MOVE INTO AREA JUST BEFORE DAYBREAK.  HAVE UPPED
THE POP TO LIKELY ACROSS NORTH AND CENTRAL PORTIONS OF OKLAHOMA TO
CHANCE IN FAR SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.  UPDATED
FORECAST WILL BE OUT WITHIN 5 MINUTES.

33

.TUL...
AR...NONE.
OK...NONE.

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 16, 11:24 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee66 min
May 16, 11:55 PM CDTSevere Thunderstorm WarningTSACreek50 min
May 17, 12:26 AM CDTSevere Thunderstorm WarningTSAOsage, Pawnee49 min
May 17, 12:32 AM CDTSevere Thunderstorm WarningTSAWashington43 min
May 17, 12:50 AM CDTSevere Thunderstorm WarningTSATulsa25 min
May 17, 12:52 AM CDTSevere Thunderstorm WarningTSAOkfuskee53 min
May 17, 1:18 AM CDTSevere Thunderstorm WarningTSAMcIntosh, Okmulgee57 min
May 17, 1:18 AM CDTSevere Thunderstorm WarningTSAPittsburg57 min
May 17, 1:34 AM CDTSevere Thunderstorm WarningTSACraig41 min
May 17, 2:04 AM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, Muskogee56 min
May 17, 2:27 AM CDTSevere Thunderstorm WarningTSACherokee, Sequoyah63 min
May 17, 2:36 AM CDTSevere Thunderstorm WarningTSADelaware, Mayes54 min
May 17, 2:50 AM CDTSevere Thunderstorm WarningTSAAdair55 min
May 17, 2:50 AM CDTSevere Thunderstorm WarningTSALeFlore55 min
May 17, 3:07 AM CDTSevere Thunderstorm WarningTSACraig, Ottawa53 min
May 17, 8:13 AM CDTSevere Thunderstorm WarningTSACreek32 min
May 17, 8:30 AM CDTSevere Thunderstorm WarningTSATulsa30 min
May 17, 9:16 AM CDTSevere Thunderstorm WarningTSAMuskogee, Wagoner29 min
May 17, 10:00 AM CDTSevere Thunderstorm WarningTSAHaskell45 min
May 17, 10:10 AM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg35 min
May 17, 10:30 AM CDTSevere Thunderstorm WarningTSAAdair45 min
May 17, 10:30 AM CDTSevere Thunderstorm WarningTSASequoyah45 min
May 17, 1:55 PM CDTSevere Thunderstorm WarningTSAHaskell35 min
May 17, 2:05 PM CDTSevere Thunderstorm WarningTSAPittsburg40 min
May 17, 2:31 PM CDTSevere Thunderstorm WarningTSAPushmataha44 min
May 17, 2:32 PM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg43 min
May 17, 3:05 PM CDTSevere Thunderstorm WarningTSALeFlore40 min
May 17, 3:11 PM CDTFlash Flood WarningTSALeFlore2 hr
May 17, 3:35 PM CDTFlash Flood WarningTSALatimer115 min
May 17, 4:08 PM CDTSevere Thunderstorm WarningTSALatimer, LeFlore37 min
May 17, 4:51 PM CDTSevere Thunderstorm WarningTSAPushmataha54 min
May 17, 4:56 PM CDTFlash Flood WarningTSALeFlore3 hr
May 17, 5:09 PM CDTSevere Thunderstorm WarningTSALeFlore, Sequoyah51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999Every severe thunderstorm warning in 1999

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.