Alert archive / Missouri / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 481

June 23, 20005 counties in Illinois; 27 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2000, 12:30 PM CDT for 5 counties in Illinois; 27 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 23, 2000, 12:30 PM CDT (17:30 UTC)
Expired: Jun 23, 2000, 5:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 32 counties

Adams County, IL, Brown County, IL, Hancock County, IL, Pike County, IL, Scott County, IL, Adair County, MO, Caldwell County, MO, Chariton County, MO, Clark County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Nodaway County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO

The radar

The Pleasant Hill radar (KEAX), 172 km from the middle of the area, began a volume at 17:31 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

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

Issued	Product	Office	Counties	Lasted
Jun 23, 12:39 PM CDT	Severe Thunderstorm Warning	EAX	Gentry, Worth	66 min
Jun 23, 1:14 PM CDT	Severe Thunderstorm Warning	EAX	Harrison	61 min
Jun 23, 1:40 PM CDT	Severe Thunderstorm Warning	EAX	Grundy, Mercer	65 min
Jun 23, 4:05 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	40 min
Jun 23, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Adams	51 min

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 5.5 hours before the alert went out and 241 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: 3049 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: -13 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.

230 
WWUS9 KMKC 231728
SEL1  
MKC WW 231722
ILZ000-MOZ000-232200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 481
STORM PREDICTION CENTER NORMAN OK
1222 PM CDT FRI JUN 23 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WEST CENTRAL ILLINOIS                           
   NORTHERN MISSOURI                           

EFFECTIVE THIS FRIDAY AFTERNOON FROM 1230 PM UNTIL 500 PM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 110 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF SPICKARD
MISSOURI TO 50 MILES SOUTH SOUTHEAST OF KIRKSVILLE MISSOURI.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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 480...

DISCUSSION...THUNDERSTORMS FORMING ON SRN FRINGE OF IA MCV
CIRCULATION EXPECTED TO MOVE/DEVELOP ESE INO UNSTABLE AIR OVER
NRN/ERN MO.  SEWD MOTION SHOULD INTENSIFY AS ACTIVITY SPREADS EWD
BENEATH FLOW THAT BECOMES INCREASINGLY NWLY TOWARD AND E OF THE MS
RIVER. 

AVIATION...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 550.  MEAN STORM
MOTION VECTOR 28030.

...CORFIDI

403,0910 392,0900 392,0941 403,0952

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Carroll, Champaign, Coles, DeWitt, Douglas and 33 more	5 hr
Jun 23, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 25 more	4 hr
Jun 23, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Andrew, Atchison, Caldwell, Chariton, Daviess and 13 more	6 hr

Nearby

Severe Thunderstorm Watches in Missouri, 2000 Severe Thunderstorm Watches in Illinois, 2000 Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.