Alert archive / Arkansas / Tornado Watches in 2002

Tornado Watch 199

May 1, 200214 counties in Arkansas; Oregon County, Missouri

The Storm Prediction Center issued this tornado watch at May 1, 2002, 9:00 PM CDT for 14 counties in Arkansas; Oregon County, Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2002, 9:00 PM CDT (02:00 UTC)
Expired
May 2, 2002, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Fulton County, AR, Izard County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Washington County, AR, Oregon County, MO

The radar

The Springfield radar (KSGF), 123 km from the middle of the area, began a volume at 02:02 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.

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 1, 9:00 PM CDTTornado WarningTSAWashington45 min
May 1, 9:12 PM CDTSevere Thunderstorm WarningTSABenton33 min
May 1, 9:30 PM CDTSevere Thunderstorm WarningLZKBoone30 min
May 1, 9:33 PM CDTTornado WarningTSAMadison42 min
May 1, 9:55 PM CDTSevere Thunderstorm WarningLZKMarion35 min
May 1, 10:25 PM CDTSevere Thunderstorm WarningSGFOregon65 min
May 1, 10:44 PM CDTSevere Thunderstorm WarningTSAMadison, Washington46 min
May 2, 1:15 AM CDTSevere Thunderstorm WarningTSAWashington45 min
May 2, 1:38 AM CDTTornado WarningTSAWashington37 min
May 2, 1:55 AM CDTSevere Thunderstorm WarningTSAMadison50 min

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.0 hours before the alert went out and 100 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 2002-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1175 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2002-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939587897Sfc1 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
1175 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1882 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 020145
SEL9  
SPC WW 020141
ARZ000-020700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 199
STORM PREDICTION CENTER NORMAN OK
841 PM CDT WED MAY 1 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   NORTHERN ARKANSAS                           

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 900 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 30 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF FAYETTEVILLE
ARKANSAS TO 100 MILES EAST OF HARRISON ARKANSAS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 196...WW 197...WW 198...

DISCUSSION...THUNDERSTORMS HAVE RAPIDLY DEVELOPED DOWN COLD FRONT
INTO NORTHWEST AR.  THESE STORMS ARE IN A FAVORABLE THERMODYNAMIC
AND KINEMATIC ENVIRONMENT FOR SUPERCELLS AND TORNADOES.  WESTWARD
EXTENT OF DEVELOPMENT REMAINS A QUESTION DUE TO STRONG CAP. 
HOWEVER...PARTS OF EASTERN OK MAY ALSO REQUIRE A WW LATER THIS
EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 27035.

...HART

362,0942 364,0912 354,0912 352,0942

WWUS20 KWNS 020145
SEL9  
SPC WW 020141
ARZ000-020700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 199
STORM PREDICTION CENTER NORMAN OK
841 PM CDT WED MAY 1 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   NORTHERN ARKANSAS                           

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 900 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 30 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF FAYETTEVILLE
ARKANSAS TO 100 MILES EAST OF HARRISON ARKANSAS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 196...WW 197...WW 198...

DISCUSSION...THUNDERSTORMS HAVE RAPIDLY DEVELOPED DOWN COLD FRONT
INTO NORTHWEST AR.  THESE STORMS ARE IN A FAVORABLE THERMODYNAMIC
AND KINEMATIC ENVIRONMENT FOR SUPERCELLS AND TORNADOES.  WESTWARD
EXTENT OF DEVELOPMENT REMAINS A QUESTION DUE TO STRONG CAP. 
HOWEVER...PARTS OF EASTERN OK MAY ALSO REQUIRE A WW LATER THIS
EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 27035.

...HART

362,0942 364,0912 354,0912 352,0942

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 2:00 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more3 hr
May 1, 7:00 PM CDTTornado WatchSPCCrawford, Dent, Douglas, Franklin, Howell, Iron and 15 more4 hr
May 1, 10:30 PM CDTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Howell, Iron and 12 more6 hr
May 2, 7:30 AM CDTSevere Thunderstorm WatchSPCCape Girardeau, Mississippi, New Madrid, Perry, Scott5 hr

Nearby

Tornado Watches in Arkansas, 2002Tornado Watches in Missouri, 2002Every tornado watch in 2002

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.