Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 424, NWS Tulsa, OK

September 1, 1998Osage County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Sep 1, 1998, 8:31 PM CDT for Osage County, Washington County, Oklahoma. It was in force for 44 min. 1 report 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
Sep 1, 1998, 8:31 PM CDT (01:31 UTC)
Expired
Sep 1, 1998, 9:15 PM CDT
In force
44 min
Issued by
NWS Tulsa, OK
Area
Whole counties

Counties Osage County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 76 km from the middle of the area, began a volume at 01:33 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

TimeReportWhereRemark
Sep 1, 8:45 PM CDTThunderstorm WindDewey, OKSeveral trees were blown down just west of Dewey.

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 nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.5 hours before the alert went out and 211 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 1998-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 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 1998-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
157 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
1836 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
126 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.

079 
WUUS54 KTSA 020133 RRA
SVRTUL
OKC113-147-020215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
831 PM CDT TUE SEP 1 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  EASTERN OSAGE COUNTY IN NORTHEASTERN OKLAHOMA
  WASHINGTON COUNTY IN NORTHEASTERN OKLAHOMA

* UNTIL 915 PM CDT

* AT 828 PM...RADAR DETECTED A SEVERE THUNDERSTORM 4 MILES NORTHWEST
  OF THE BARTLESVILLE AIRPORT...MOVING SOUTHEAST AT 15 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  BARLESVILLE
  OKESA
  OCHELATA

  HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH CAN BE
  EXPECTED IN THE WARNED AREA.

BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

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 Sep 1, 3:40 PM CDT, 4 hours 51 minutes earlier.

Area forecast discussion, Sep 1, 3:40 PM CDT, 4 hours 51 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
340 PM CDT TUE SEP 1 1998

PROBLEM(S) OF THE DAY:
WILL THERE BE CONVECTION?
TEMPERATURES

LOTS OF UNCERTAINTY IN THE FORECAST TODAY...BUT PERSISTENCE IS STILL
THE BEST BET.  FIRST PROBLEM IS WHETHER CONVECTION WILL WORK EASTWARD
INTO THE FORECAST AREA FROM NORTH CENTRAL OKLAHOMA.  MESONET SHOWS
CONSIDERABLY MORE CONVERGENCE TO THE WEST WITH VERY WEAK CONVERGENCE
IN EASTERN OKLAHOMA.  WILL NOT PLAN ON LEAVING ANY EVENING POPS...BUT
WILL MONITOR LATEST RADAR TRENDS BEFORE ISSUANCE TIME.

T.S. EARL DOES NOT APPEAR AS THOUGH IT WILL AFFECT THE AREA...WITH
THE EXCEPTION OF EASTERLY WINDS AND PERHAPS SOME INCREASED HIGH CLOUD
IN THE SOUTHERN ZONES.  BASICALLY IF EARL EVER GETS THIS FAR NORTH IT
WILL LIKELY GET CAUGHT UP IN THE WESTERLIES AND WILL FOREVER REMAIN
EAST OF US.  BUT THE MOST LIKELY EVENT IS THAT IT WILL EVENTUALLY BE
SWEPT WEST OR SOUTHWESTWARD INTO THE TEXAS OR MEXICAN COAST AROUND
SOUTH SIDE OF THAT ROCKY MOUNTAIN HIGH.  DESPITE THE EAST WINDS
EXPECTED TO THE NORTH OF EARL'S CIRCULATION...THE ETA DOES NOT SHOW
ANY CONSIDERABLE COOLING AT 850 MB.  THEREFORE WILL GO WITH MOSTLY
SUNNY SKIES EXCEPT FOR PARTLY CLOUDY IN THE EXTREME SOUTHEAST AND
WILL GO WITH PERSISTENCE ON TEMPERATURES THROUGH THIS FORECAST.

AS FOR MOS TEMPERATURES...WILL GO WELL ABOVE GUIDANCE FOR HIGHS AND
STAY FAIRLY CLOSE TO LOWS.

EXTENDED FORECAST IS MUDDLED BY MODELS HANDLING OF EARL...SO THERE IS
A LOT OF UNCERTAINTY GOING INTO THE WEEKEND.  THERE WILL PROBABLY BE
SOME MORE ISOLATED CONVECTION AT SOME POINT LATE IN THE WEEK OR OVER
THE WEEKEND...BUT THERE IS LITTLE GO ON FOR POPS AT THIS TIME.  ONCE
MODELS GET A HANDLE ON EARL HOPEFULLY THE PICTURE WILL CLEAR UP SOME.

FCSTID = 19
TUL   67  99  68  99 /   5   5   0   0
FSM   69  98  68  97 /   5   5   5   5
MLC   65  99  67  98 /   5   5   5   5
BVO   64  99  64  99 /   5   5   0   0
FYV   61  91  60  90 /   5   5   0   0
IDB   66  99  67  98 /   5   5   5   5
BYV   61  91  60  90 /   5   5   0   0
MIO   63  97  62  97 /   5   5   0   0
MKO   67  99  68  99 /   5   5   0   0
F10   67  99  68  99 /   5   5   0   0
HHW   66  99  67  98 /   5   5   5   5

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

--------------------
EXPERIMENTAL OUTPUT:

GENERAL WEATHER EXPECTED NEXT 24 HOURS: NO PRECIP
HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS:  NONE
NGM CONFIDENCE:  6 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  6 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10

Nearby

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.