Alert archive / Arkansas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 94, NWS Tulsa, OK

April 20, 2000Franklin County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 20, 2000, 2:00 AM CDT for Franklin County, Arkansas. It was in force for 45 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: Apr 20, 2000, 2:00 AM CDT (07:00 UTC)
Expired: Apr 20, 2000, 2:45 AM CDT
In force: 45 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Franklin County, AR

The radar

The Western Arkansas radar (KSRX), 49 km from the middle of the area, began a volume at 07:03 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
Apr 20, 2:20 AM CDT	Thunderstorm Wind	Cass, AR	Thunderstorm winds blew down several large tree limbs.

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
Apr 20, 12:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 7.0 hours before the alert went out and 155 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: 1428 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 1062 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 200701
SVRTUL
ARC047-200745-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
200 AM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN FRANKLIN COUNTY IN WEST CENTRAL ARKANSAS

* UNTIL 245 AM CDT

* AT 200 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF FERN...MOVING EAST AT 50
  MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...CASS AND FERN

HAIL TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO 65 MPH CAN BE 
EXPECTED IN THE WARNED AREA.

THIS IS A DANGEROUS STORM. IF YOU ARE NEAR ITS PATH YOU SHOULD
PREPARE FOR VERY LARGE HAIL AND STRONG DAMAGING STRAIGHT LINE WINDS.
SEEK SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS!

CALL 1-800-722-2778 TO REPORT SEVERE WEATHER TO THE NATIONAL WEATHER
SERVICE.

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 Apr 19, 9:22 PM CDT, 4 hours 38 minutes earlier.

Area forecast discussion, Apr 19, 9:22 PM CDT, 4 hours 38 minutes before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
922 PM CDT WED APR 19 2000

CAPPING INVERSION AND WEAK CONVERGENCE ALONG DRYLINE HAS KEPT
BOUNDARY-LAYER BASED CONVECTION FROM DEVELOPING ACROSS THE FORECAST
AREA SO FAR THIS EVENING. SURFACE OBSERVATIONS AND SATELLITE IMAGERY
SHOW THE DRYLINE EXTENDING FROM SOUTHEAST KANSAS ACROSS THE
NORTHWEST CORNER OF OSAGE COUNTY TO JUST NORTHWEST OF KOKC.  SURFACE
COLD FRONT WAS SURGING RAPIDLY SOUTHEAST ACROSS CENTRAL KANSAS AND
NORTHWEST OKLAHOMA.

EVENING UPPER AIR ANALYSIS INDICATED AN UPPER LEVEL SPEED MAX MOVING
NORTHEAST ACROSS TEXAS PANHANDLE. RAPID DEVELOPMENT OF CLOUDS IN
NORTHWEST OKLAHOMA SUGGESTS THAT LIFT ASSOCIATED WITH THE SPEED MAX
WAS SPREADING EAST.

STILL EXPECT AT LEAST SCATTERED SEVERE STORMS TO AFFECT THE FORECAST
AREA TONIGHT. CURRENT INDICATIONS ARE THAT CONVECTION MAY INITIALLY
FIRE TO THE WEST BETWEEN 10 AND 11 PM AS COLD FRONT CATCHES UP TO
DRYLINE AND STRONG INSTABILITY IS RELEASED. THE UPPER SPEED MAX WILL
PROVIDE THE LIFT/DYNAMICS TO KEEP THE STORMS GOING WELL INTO THE
NIGHT AS CONVECTION MOVES ACROSS THE AREA.

THERE ARE STILL SOME UNCERTAINTIES REGARDING COVERAGE OF STORMS
TONIGHT...SO I PREFER NOT TO ADJUST FIRST PERIOD OF FORECAST AT THIS
TIME. HOWEVER...IF STORMS DO INDEED FIRE ALONG THE COLD FRONT AS
EXPECTED...WILL THEN ISSUE AN UPDATE TO RAISE POPS TO CATEGORICAL IN
SOME AREAS WITH POTENTIAL FOR RAPIDLY MOVING SQUALL LINE.

FCSTID = 9

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

In the hours before

Local storm report, Apr 20, 12:39 AM CDT, 1 hour 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1239 AM CDT THU APR 20 2000

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

1200 AM    2 N HASKELL               OK    1.75 INCH HAIL
04/20/00   MUSKOGEE                        PUBLIC REPORT OF
                                           GOLFBALL HAIL.

DRM

Local storm report, Apr 20, 12:51 AM CDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1251 AM CDT THU APR 20 2000

TIME(CDT)  .....CITY LOCATION..... STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....
(
1212 AM    OKAY                      OK    75 MPH TSTM GUST
04/20/00   WAGONER                         FIRE DEPT. REPORT

DRM

Special weather statement, Apr 20, 12:55 AM CDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1255 AM CDT THU APR 20 2000

OKZ054-055-059-200900-
A TORNADO WATCH IS NO LONGER IN EFFECT FOR THE FOLLOWING COUNTIES IN

EASTERN OKLAHOMA.
         PAWNEE              WASHINGTON OK       OSAGE

OKZ049-053-056>058-060>075-200900-
A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CDT THURSDAY FOR THE
FOLLOWING COUNTIES IN

EASTERN OKLAHOMA...
         ADAIR               CHEROKEE            CHOCTAW
         CRAIG               CREEK               DELAWARE
         HASKELL             LATIMER             MAYES
         MCINTOSH            MUSKOGEE            NOWATA
         OTTAWA              OKFUSKEE            OKMULGEE
         PITTSBURG           PUSHMATAHA          ROGERS
         SEQUOYAH            TULSA               WAGONER

Special weather statement, Apr 20, 1:18 AM CDT, 42 minutes before

ZCZC WRKWG2
TTAA00 KOKC DDHHMM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
118 AM CDT THU APR 20 2000

OKZ056-060>061-064>066-200900-
A TORNADO WATCH IS NO LONGER IN EFFECT FOR THE FOLLOWING COUNTIES IN

EASTERN OKLAHOMA.
         CREEK               OKFUSKEE
         TULSA               OKMULGEE
         NOWATA              ROGERS

OKZ049-053-057-058-062-063-067>075-200900-
A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 AM CDT THURSDAY FOR THE
FOLLOWING COUNTIES IN

EASTERN OKLAHOMA...
         ADAIR               CHEROKEE            CHOCTAW
         CRAIG               DELAWARE            HASKELL
 =        LATIMER             MAYES               MCINTOSH
         MUSKOGEE            OTTAWA              PITTSBURG
         PUSHMATAHA          SEQUOYAH            WAGONER

Local storm report, Apr 20, 1:35 AM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
135 AM CDT THU APR 20 2000

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

1118 PM    2 N PRESTON               OK    .88 INCH HAIL
04/19/00   OKMULGEE                        STORM SPOTTER REPORT

0104 AM    CINCINNATI                AR    WIND DAMAGE
04/20/00   WASHINGTON                      PORCH DESTROYED.
                                           GARAGE ROOF BLOWN OFF.
                                           LARGE TREES DOWN.  COOP
                                           OBSERVER REPORT.

DRM

Special weather statement, Apr 20, 1:45 AM CDT, 15 minutes before

OKZ049-053>075-200645-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
145 AM CDT THU APR 20 2000

.TORNADO WATCH NUMBER 181 HAS BEEN CANCELLED FOR ALL OF EASTERN
OKLAHOMA.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 12:58 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Washington	62 min
Apr 20, 1:21 AM CDT	Severe Thunderstorm Warning	TSA	Crawford	54 min
Apr 20, 1:37 AM CDT	Severe Thunderstorm Warning	TSA	Carroll, Madison	38 min
Apr 20, 2:14 AM CDT	Severe Thunderstorm Warning	TSA	Madison	31 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2000 Every severe thunderstorm warning in 2000

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.