Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 210, NWS Tulsa, OK

May 9, 1998Okfuskee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 9, 1998, 1:45 PM CDT for Okfuskee County, Oklahoma. It was in force for 30 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 9, 1998, 1:45 PM CDT (18:45 UTC)
Expired: May 9, 1998, 2:15 PM CDT
In force: 30 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 18:44 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.8 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: 208 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 773 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 589 m²/s²
0-3 km storm-relative helicity: 623 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

739 
WUUS54 KTSA 091846 RRA
SVRTUL
OKC107-091915-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
145 PM CDT SAT MAY 9 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  OKFUSKEE COUNTY - EAST CENTRAL OKLAHOMA

* UNTIL 215 PM CDT

* AT 145 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM 3 MILES SOUTH OF PADEN...MOVING EAST NORTHEAST
  AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  BOLEY

  HAIL TO THE SIZE OF DIMES AND WIND GUSTS TO 50 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 9, 10:50 AM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, May 9, 10:50 AM CDT, 2 hours 55 minutes before

FPUS3 KTUL 091554
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
1050 AM CDT SAT MAY 9 1998

COMPLEX SFC PATTERN THIS MRNG WITH ONE LOW ACRS NW OK...TRIPLE PT LOW
ALG RED RVR WITH WM FNT EXTENDING E THRU NE TX.  BAND OF TSRA
CONTINUE ACRS ERN OK...WITH ADDITIONAL DVLPMT THE PAST HR ALG LEAD
GUST FNT.  UPR LOW AND ASSOCD COLD POOL OVR WRN OK WL MV INTO NW AR
BY 00Z...SO COULD SEE MORE CONVECTION DVLP LTR THIS AFTN.  WL KP
HIGHEST POPS AND MENTION OF HVY RN ALG AND N OF TRACK OF H5 LOW.

UPDATE SHUD BE OUT BY 1130 AM.

18

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

In the hours before

Local storm report, May 9, 9:40 AM CDT, 4 hours 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
940 AM CDT SAT MAY 9 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0905 AM    OAK GROVE                 AR   1 INCH HAIL
05/09/98   CARROLL                        QUARTER SIZE HAIL
                                          COVERING THE GROUND

0915 AM    15 S HUNSTVILLE           AR   .75 INCH HAIL
05/09/98   MADISON

Local storm report, May 9, 10:46 AM CDT, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1046 AM CDT SAT MAY 09 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0856 AMv    BERRYVILLE                AR   1.75 INCH HAIL
05/09/98   CARROLL

0945 AM    METALTON                  AR   .75 INCH HAIL
05/09/98   CARROLL

Local storm report, May 9, 10:46 AM CDT, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1046 AM CDT SAT MAY 09 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0856 AMv    BERRYVILLE                AR   1.75 INCH HAIL
05/09/98   CARROLL

0945 AM    METALTON                  AR   .75 INCH HAIL
05/09/98   CARROLL

Special weather statement, May 9, 1:00 PM CDT, 45 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
100 PM CDT SAT MAY 9 1998

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS NORTHWEST ARKANSAS THIS
AFTERNOON.

AT MIDDAY...SURFACE LOW PRESSURE WAS LOCATED OVER SOUTH CENTRAL OKLAHOMA
WITH A COLD FRONT TO ITS SOUTH ACROSS CENTRAL TEXAS AND AND WARM FRONT
TO ITS SOUTHEAST ACROSS NORTHEAST TEXAS AND LOUISIANA.  MEANWHILE...AN
UPPER LEVEL LOW PRESSURE SYSTEM WAS LOCATED OVER NORTH CENTRAL OKLAHOMA.
THESE SURFACE AND UPPER LEVEL SYSTEMS WILL MOVE ACROSS EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS THIS AFTERNOON AND TO THE EAST OF THE AREA THIS
EVENING.

ALTHOUGH THE SURFACE INSTABILITY ACROSS THE AREA WILL BE MEAGER...COLD
AIR ALOFT ASSOCIATED WITH THE UPPER LEVEL SYSTEM WILL BE SUFFICIENT TO
PRODUCE CONSIDERABLE MID LEVEL INSTABILITY.  THE MID LEVEL INSTABILITY
WILL BE THE GREATEST OVER NORTHWEST ARKANSAS THIS AFTERNOON.  THE RESULT
WILL BE A FEW SEVERE THUNDERSTORMS.  THE MAIN THREAT FROM THESE
THUNDERSTORMS WILL BE LARGE HAIL AND DAMAGING WINDS.  HOWEVER...ENOUGH
FORCING AND MID LEVEL INSTABILITY MAY BE PRESENT FOR AN ISOLATED
SUPERCELL WHICH MAY PRODUCE A TORNADO.

CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS ACROSS NORTHWEST ARKANSAS
SHOULD BE PREPARED FOR ACTIVATION THIS AFTERNOON.

Special weather statement, May 9, 1:00 PM CDT, 45 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-101200-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
100 PM CDT SAT MAY 9 1998

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS NORTHWEST ARKANSAS THIS
AFTERNOON.

AT MIDDAY...SURFACE LOW PRESSURE WAS LOCATED OVER SOUTH CENTRAL OKLAHOMA
WITH A COLD FRONT TO ITS SOUTH ACROSS CENTRAL TEXAS AND AND WARM FRONT
TO ITS SOUTHEAST ACROSS NORTHEAST TEXAS AND LOUISIANA.  MEANWHILE...AN
UPPER LEVEL LOW PRESSURE SYSTEM WAS LOCATED OVER NORTH CENTRAL OKLAHOMA.
THESE SURFACE AND UPPER LEVEL SYSTEMS WILL MOVE ACROSS EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS THIS AFTERNOON AND TO THE EAST OF THE AREA THIS
EVENING.

ALTHOUGH THE SURFACE INSTABILITY ACROSS THE AREA WILL BE MEAGER...COLD
AIR ALOFT ASSOCIATED WITH THE UPPER LEVEL SYSTEM WILL BE SUFFICIENT TO
PRODUCE CONSIDERABLE MID LEVEL INSTABILITY.  THE MID LEVEL INSTABILITY
WILL BE THE GREATEST OVER NORTHWEST ARKANSAS THIS AFTERNOON.  THE RESULT
WILL BE A FEW SEVERE THUNDERSTORMS.  THE MAIN THREAT FROM THESE
THUNDERSTORMS WILL BE LARGE HAIL AND DAMAGING WINDS.  HOWEVER...ENOUGH
FORCING AND MID LEVEL INSTABILITY MAY BE PRESENT FOR AN ISOLATED
SUPERCELL WHICH MAY PRODUCE A TORNADO.

CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS ACROSS NORTHWEST ARKANSAS
SHOULD BE PREPARED FOR ACTIVATION THIS AFTERNOON.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 8:15 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	45 min
May 9, 9:00 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	45 min
May 9, 11:37 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	38 min
May 9, 11:54 AM CDT	Severe Thunderstorm Warning	TSA	Adair	21 min
May 9, 12:07 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	23 min
May 9, 12:43 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	32 min
May 9, 3:04 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Pittsburg	41 min
May 9, 3:44 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer	61 min
May 9, 3:46 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	29 min
May 9, 4:21 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	54 min
May 9, 5:11 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	34 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; radar from the NEXRAD Level II archive.