Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 156, NWS Tulsa, OK

May 5, 1998Okfuskee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 5, 1998, 3:19 AM CDT for Okfuskee County, Oklahoma. It was in force for 71 min. 2 reports 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: May 5, 1998, 3:19 AM CDT (08:19 UTC)
Expired: May 5, 1998, 4:30 AM CDT
In force: 71 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Okfuskee County, OK

The radar

The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 08:22 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.

What was reported inside it

Time	Report	Where	Remark
May 5, 4:10 AM CDT	Hail 0.88	Okemah, OK	At intersection of SH 48 and I-40
May 5, 4:40 AM CDT	Hail 0.88	Pharoah, 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
May 5, 1:45 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.3 hours before the alert went out and 101 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: 7 J/kg
Mixed-layer CIN: -421 J/kg
Mixed-layer LCL: 2029 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

106 
WUUS54 KTSA 050820 RRA
SVRTUL
OKC107-050930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
319 AM CDT TUE MAY 5 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  OKFUSKEE COUNTY - EAST CENTRAL OKLAHOMA

* UNTIL 430 AM CDT

* AT 318 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 2 MILES SOUTH OF PADEN...MOVING EAST AT 10 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  PADEN
  BOLEY
  CASTLE
  OKEMAH

  HAIL TO THE SIZE OF HALF DOLLARS 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 4, 10:00 PM CDT, 5 hours 19 minutes earlier.

Area forecast discussion, May 4, 10:00 PM CDT, 5 hours 19 minutes before

FPUS3 KTUL 050305
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1000 PM CDT MON MAY 4 1998

JUST SENT OUT UPDATE TO TWEAK FORECAST A BIT.  BASIC FORECAST IS IN
GOOD SHAPE.  MAIN CHANGE WAS TO MENTION SEVERE IN BVO AND TUL...
BRINGING ZONES INTO LINE WITH CURRENT THINKING OF HAILERS DEVELOPING
WITHIN THE WAA ZONE CRANKING UP OVER CNTRL/ERN OK TONIGHT.  00Z OUN
SOUNDING SHOWS STEEP LAPSE RATE ABOVE MOIST LAYER AROUND 800MB.
STORMS WILL BE ELEVATED...BUT DECENT INSTABILITY WILL LIKELY ALLOW
FOR SOME DECENT HAIL WITH THE STRONGEST STORMS.  STORM SHOULD
INITIATE OVER/NEAR WRN ZONES AROUND MIDNIGHT AND THEN SPREAD EAST.
ACROSS AREA.  LOW-LEVEL MOISTURE TRYING TO MOVE NWD COULD REACH SE OK
IN TIME TO CAUSE SOME EVEN BIGGER PROBLEMS AROUND SUNRISE DOWN THERE.

OTHERWISE TAPERED POPS FROM 50S OVER WRN/SRN ZONES TO 30S IN NW AR
PRETTY MUCH IN LINE WITH PREVIOUS FORECAST.  DID NOT INCREASE POPS
DUE TO UNCERTAINTIES IN THE AREAL COVERAGE OF THE STORMS AND THE
TIMING.  ONLY MINOR CHANGES MADE TO REMAINDER OF FIRST PERIOD
FORECAST.

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 5, 4:15 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	60 min
May 5, 4:23 AM CDT	Flash Flood Warning	TSA	Okfuskee	3 hr
May 5, 4:28 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	62 min
May 5, 4:48 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	72 min
May 5, 5:05 AM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	40 min
May 5, 5:27 AM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	33 min
May 5, 5:41 AM CDT	Flash Flood Warning	TSA	McIntosh, Okmulgee	109 min
May 5, 5:53 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	37 min
May 5, 6:15 AM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	45 min
May 5, 6:33 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	57 min
May 5, 6:42 AM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	63 min
May 5, 7:30 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore	45 min
May 5, 7:42 AM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	63 min
May 5, 9:00 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	60 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.