Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 158, NWS Tulsa, OK

May 5, 1998Okfuskee County, Okmulgee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 5, 1998, 4:28 AM CDT for Okfuskee County, Okmulgee County, Oklahoma. It was in force for 62 min. 4 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, 4:28 AM CDT (09:28 UTC)
Expired: May 5, 1998, 5:30 AM CDT
In force: 62 min
Issued by: NWS Tulsa, OK
Area: Whole counties

Counties Okfuskee County, OK, Okmulgee County, OK

What was reported inside it

Time	Report	Where	Remark
May 5, 4:40 AM CDT	Hail 0.88	Pharoah, OK
May 5, 4:45 AM CDT	Hail 0.88	Okemah, OK	Hail accumulated to depths of 1 to 2 inches
May 5, 5:18 AM CDT	Hail 1	Henryetta, OK
May 5, 5:30 AM CDT	Hail 0.88	Henryetta, OK	Report from downtown Henryetta

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, 9.5 hours before the alert went out and 120 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.

430 
WUUS54 KTSA 050929 RRA
SVRTUL
OKC107-111-051030-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  OKFUSKEE COUNTY - EAST CENTRAL OKLAHOMA
  OKMULGEE COUNTY - NORTHEASTERN OKLAHOMA

* UNTIL 530 AM CDT

* AT 428 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  CLUSTER OF SEVERE THUNDERSTORMS FROM OKEMAH TO WELEETKA...MOVING
  EAST AT 5 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  HENRYETTA
  PHAROAH

  HAIL TO THE SIZE OF QUARTERS 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, 3:20 AM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, May 5, 3:20 AM CDT, 1 hour 8 minutes before

FPUS3 KTUL 050821
AFDTUL

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

PROBLEM OF THE DAY:
FIGURING OUT WHAT WILL HAPPEN AFTER THIS MORNING.

MODELS ARE OSEVERE THUNDERSTORM WARNING FOR...
     SOUTHEAST LINCOLN COUNTY IN CENTRAL OKLAHOMA

* UNTIL 400 AM CDT

* AT 322 AM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR
PRAGUE...MOVING EAST-NORTHEAST AT 15 MILES PER HOUR.

* LOCATIONS IN THE WARNING INCLUDE PRAGUE

HAIL UP TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO AT LEAST 60 MPH ARE
LIKELY. SEEK SHELTER INDOORS...AWAY FROM WINDOWS...AND AVOID
ELECTRICAL APPLIANCES AND TELEPHONES.

LAT...LON 3547 9682 3547 9667 3567 9622 3563 9664

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 3:19 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	71 min
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, 4:48 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.