Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 173, NWS Tulsa, OK

May 6, 1998LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 6, 1998, 3:26 AM CDT for LeFlore County, Oklahoma. It was in force for 34 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 6, 1998, 3:26 AM CDT (08:26 UTC)
Expired: May 6, 1998, 4:00 AM CDT
In force: 34 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County LeFlore County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.4 hours before the alert went out and 248 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 906 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

456 
WUUS54 KTSA 060828 RRA
SVRTUL
OKC079-060900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
326 AM CDT WED MAY 6 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  LE FLORE COUNTY - SOUTHEASTERN OKLAHOMA

* UNTIL 400 AM CDT

* AT 325 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM NEAR HEAVENER...MOVING EAST AT 20 MPH.
  AT 321 AM SPOTTERS REPORTED NICKEL SIZE HAIL WITH THIS STORM AS IT
  APPROACHED HEAVENER.

* SOME LOCATIONS AFFECTED INCLUDE...
  HEAVENER

  HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 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 5, 9:25 PM CDT, 6 hours 1 minute earlier.

Area forecast discussion, May 5, 9:25 PM CDT, 6 hours 1 minute before

FPUS3 KTUL 060226
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
925 PM CDT TUE MAY 5 1998

SCATTERED SHRA/TSRA HAVE CONTINUALLY GENERATED ACROSS XTRM NE OK THIS
EVENING AND MOVED OFF INTO SW MO...WHERE LARGER AREA OF SHRA/TSRA IS
DEVELOPING.  BELIEVE THAT THIS AREA OF ACTIVITY WILL EVENTUALLY BUILD
SOUTHWARD AS LLJ KICKS IN ACROSS WRN AR.  WILL THEREFORE INCREASE
POPS TO LIKELY ACROSS XTRM NE OK AND NW CORNER OF AR.  WILL THEN
TREND POPS DOWN TO 40S ACROSS SE OK.  AM NOT CERTAIN WHETHER ACTIVITY
WILL REACH SEVERE CRITERIA EVEN WITH STRENGTHENING LLJ...SO WILL NOT
INTRODUCE SEVERE IN ZONES AT THIS TIME.

AS FOR SOUTH CENTRAL OKLAHOMA STORMS...BELIEVE SWODY1 HAS GOOD HANDLE
ON THE SITUATION SO WILL LEAVE CHANCE POPS GOING FOR SE OK AND NOT
MENTION SEVERE.

REST OF FORECAST IS IN PRETTY GOOD SHAPE...SO ONLY MINOR TWEAKS TO
MINS ARE EXPECTED.

FCSTID = 19

.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
May 6, 1:56 AM CDT	Severe Thunderstorm Warning	TSA	Adair	49 min
May 6, 2:42 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	48 min
May 6, 3:56 AM CDT	Flash Flood Warning	TSA	LeFlore	2 hr
May 6, 3:59 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	46 min
May 6, 4:41 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	49 min
May 6, 5:07 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee	53 min
May 6, 5:26 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	64 min
May 6, 5:41 PM CDT	Tornado Warning	TSA	Okmulgee	49 min
May 6, 5:49 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	56 min
May 6, 5:55 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	65 min
May 6, 6:06 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee	24 min
May 6, 6:11 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	64 min
May 6, 6:14 PM CDT	Tornado Warning	TSA	Muskogee	46 min
May 6, 6:20 PM CDT	Tornado Warning	TSA	Nowata, Washington	40 min
May 6, 6:29 PM CDT	Tornado Warning	TSA	McIntosh	61 min
May 6, 6:36 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	54 min
May 6, 6:38 PM CDT	Severe Thunderstorm Warning	TSA	Craig	52 min
May 6, 6:43 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers, Wagoner	77 min
May 6, 6:54 PM CDT	Flash Flood Warning	TSA	Tulsa	3 hr
May 6, 6:59 PM CDT	Severe Thunderstorm Warning	TSA	Creek	61 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every 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.