Alert archive / Missouri / Tornado Watches in 2001

Tornado Watch 812

November 23, 2001Bourbon County, Cherokee County, Crawford County, Kansas; 27 counties in Missouri; Ottawa County, Oklahoma

The Storm Prediction Center issued this tornado watch at Nov 23, 2001, 7:30 PM CST for Bourbon County, Cherokee County, Crawford County, Kansas; 27 counties in Missouri; Ottawa County, Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Nov 23, 2001, 7:30 PM CST (01:30 UTC)
Expired: Nov 24, 2001, 12:00 AM CST
In force: 5 hr
Issued by: the Storm Prediction Center

All 31 counties

Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Barry County, MO, Barton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas 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, Ozark County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Ottawa County, OK

The radar

The Springfield radar (KSGF), 33 km from the middle of the area, began a volume at 01:30 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

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

Issued	Product	Office	Counties	Lasted
Nov 23, 7:37 PM CST	Tornado Warning	SGF	Lawrence, Newton	38 min
Nov 23, 8:04 PM CST	Tornado Warning	SGF	McDonald	56 min
Nov 23, 8:15 PM CST	Tornado Warning	SGF	Barry	60 min
Nov 23, 9:34 PM CST	Severe Thunderstorm Warning	SGF	Christian, Greene	56 min
Nov 23, 9:45 PM CST	Severe Thunderstorm Warning	SGF	Ozark	60 min
Nov 23, 10:43 PM CST	Tornado Warning	SGF	Ozark	62 min

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.5 hours before the alert went out and 65 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: 6 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 970 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 351 m²/s²
0-3 km storm-relative helicity: 377 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 240135
SEL2  
SPC WW 240131
KSZ000-MOZ000-240600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 812
STORM PREDICTION CENTER NORMAN OK
731 PM CST FRI NOV 23 2001

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

   EXTREME SOUTHEAST KANSAS                             
   SOUTHWEST MISSOURI                           

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 730 PM UNTIL
MIDNIGHT CST.

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 30 MILES WEST NORTHWEST OF JOPLIN MISSOURI TO
40 MILES NORTH 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 811...

DISCUSSION...CLUSTER OF SEVERE/SUPERCELL THUNDERSTORMS IS EXPECTED
TO SPREAD NORTHEASTWARD ACROSS MUCH OF SOUTHWEST MO DURING THE NEXT
SEVERAL HOURS.  DESPITE ONLY MARGINAL INSTABILITY...VERY STRONG LOW
LEVEL SHEAR PROFILES AND CONTINUING ORGANIZATION OF STORMS MAY
RESULT IN ISOLATED TORNADOES...AS WELL AS DAMAGING WINDS AND LARGE
HAIL.

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 24040.

...HART

380,0950 380,0913 362,0913 363,0950

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 23, 11:00 PM CST	Tornado Watch	SPC	Carter, Christian, Douglas, Greene, Howell, Oregon and 8 more	4 hr
Nov 24, 2:30 AM CST	Tornado Watch	SPC	Bollinger, Butler, Cape Girardeau, Dunklin, Madison, Mississippi and 7 more	5 hr
Nov 23, 6:00 PM CST	Tornado Watch	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 17 more	5 hr

Nearby

Tornado Watches in Missouri, 2001 Tornado Watches in Kansas, 2001 Tornado Watches in Oklahoma, 2001 Every 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; radar from the NEXRAD Level II archive.