Alert archive / Missouri / Tornado Watches in 2001

Tornado Watch 259

May 20, 2001Fulton County, Arkansas; 28 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 20, 2001, 7:45 PM CDT for Fulton County, Arkansas; 28 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 20, 2001, 7:45 PM CDT (00:45 UTC)
Expired
May 21, 2001, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 29 counties

Fulton County, AR, Barry County, MO, Barton County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 20, 7:57 PM CDTTornado WarningSGFNewton48 min
May 20, 8:10 PM CDTSevere Thunderstorm WarningSGFHowell50 min
May 20, 8:13 PM CDTSevere Thunderstorm WarningSGFJasper47 min
May 20, 8:16 PM CDTSevere Thunderstorm WarningSGFBenton, Hickory44 min
May 20, 8:20 PM CDTTornado WarningSGFStone40 min
May 20, 8:30 PM CDTTornado WarningSGFHowell30 min
May 20, 8:40 PM CDTTornado WarningSGFChristian, Taney50 min
May 20, 8:54 PM CDTSevere Thunderstorm WarningSGFShannon51 min
May 20, 9:10 PM CDTSevere Thunderstorm WarningSGFLawrence50 min
May 20, 9:17 PM CDTFlash Flood WarningSGFNewton4 hr
May 20, 9:24 PM CDTTornado WarningSGFShannon51 min
May 20, 9:27 PM CDTSevere Thunderstorm WarningSGFDade48 min
May 20, 9:33 PM CDTFlash Flood WarningSGFShannon4 hr
May 20, 9:33 PM CDTSevere Thunderstorm WarningSGFBarry42 min
May 20, 9:36 PM CDTSevere Thunderstorm WarningSGFDent, Texas54 min
May 20, 9:45 PM CDTSevere Thunderstorm WarningSGFGreene, Polk45 min
May 20, 9:49 PM CDTFlash Flood WarningSGFTexas4 hr
May 20, 9:52 PM CDTSevere Thunderstorm WarningSGFCedar, St. Clair, Vernon38 min
May 20, 10:01 PM CDTSevere Thunderstorm WarningSGFChristian, Lawrence, Stone44 min
May 20, 10:26 PM CDTSevere Thunderstorm WarningSGFGreene34 min
May 20, 10:43 PM CDTFlash Flood WarningSGFGreene4 hr
May 20, 10:50 PM CDTFlash Flood WarningSGFDent4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.8 hours before the alert went out and 64 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 2001-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1724 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 2001-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.19395878Sfc1 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
1724 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
670 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
232 m²/s²
Significant tornado parameter
1.7
Supercell composite
8.0

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 210030
SEL9  

SEL9  
MKC WW 210026
MOZ000-210600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 259
STORM PREDICTION CENTER NORMAN OK
726 PM CDT SUN MAY 20 2001

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

   SOUTHWEST AND SOUTH CENTRAL MISSOURI                           

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 745 PM UNTIL
100 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 10 MILES WEST NORTHWEST OF JOPLIN MISSOURI TO
40 MILES NORTHEAST OF WEST PLAINS MISSOURI.

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 255...WW 256...WW
257...WW 258...

DISCUSSION...STRONG/SEVERE THUNDERSTORMS ARE DEVELOPING NEWD FROM
NERN OK AND NWRN AR IN ADVANCE OF SHORT WAVE TROUHG MOVING EWD
ACROSS THE CENTRAL/SRN PLAINS REGION.  AIR MASS IS MODERATELY
UNSTABLE WITH SBCAPE TO 2500 J/KG...AND VAD WINDS SHOW
VEERING/INCREASE WITH HEIGHT SUGGESTING POTENTIAL FOR SUPERCELLS
AND POSSIBLE TORNADOES.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 24030.


...WEISS

;380,0944 375,0912 362,0912 362,0944;

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 9:30 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 6 more6 hr
May 20, 11:00 PM CDTTornado WatchSPCArkansas, Benton, Carroll, Clark, Cleburne, Cleveland and 38 more4 hr

Nearby

Tornado Watches in Missouri, 2001Tornado Watches in Arkansas, 2001Every tornado watch in 2001

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.