Alert archive / Kansas / Tornado Watches in 2002

Tornado Watch 112

April 18, 200240 counties in Kansas; 13 counties in Missouri; 5 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Apr 18, 2002, 4:00 PM CDT for 40 counties in Kansas; 13 counties in Missouri; 5 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 18, 2002, 4:00 PM CDT (21:00 UTC)
Expired
Apr 18, 2002, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 58 counties

Atchison County, KS, Barber County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Clay County, KS, Coffey County, KS, Cowley County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Geary County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Kingman County, KS, Leavenworth County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Reno County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Shawnee County, KS, Sumner County, KS, Wabaunsee County, KS, Woodson County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Gage County, NE, Johnson County, NE, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 81 km from the middle of the area, began a volume at 21:00 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

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

IssuedProductOfficeCountiesLasted
Apr 18, 4:48 PM CDTSevere Thunderstorm WarningEAXAtchison42 min
Apr 18, 5:15 PM CDTSevere Thunderstorm WarningICTMcPherson45 min
Apr 18, 5:37 PM CDTSevere Thunderstorm WarningTOPDickinson38 min
Apr 18, 5:57 PM CDTTornado WarningICTMcPherson48 min
Apr 18, 6:00 PM CDTSevere Thunderstorm WarningTOPGeary, Riley45 min
Apr 18, 6:36 PM CDTSevere Thunderstorm WarningEAXNodaway39 min
Apr 18, 6:44 PM CDTTornado WarningICTMcPherson46 min
Apr 18, 6:45 PM CDTSevere Thunderstorm WarningTOPPottawatomie45 min
Apr 18, 6:53 PM CDTSevere Thunderstorm WarningEAXWorth52 min
Apr 18, 6:58 PM CDTSevere Thunderstorm WarningICTMarion62 min
Apr 18, 7:08 PM CDTSevere Thunderstorm WarningTOPNemaha37 min
Apr 18, 7:17 PM CDTSevere Thunderstorm WarningEAXNodaway28 min
Apr 18, 7:25 PM CDTSevere Thunderstorm WarningEAXGentry65 min
Apr 18, 7:26 PM CDTSevere Thunderstorm WarningICTMcPherson64 min
Apr 18, 7:37 PM CDTSevere Thunderstorm WarningEAXHarrison53 min
Apr 18, 7:42 PM CDTSevere Thunderstorm WarningTOPBrown48 min
Apr 18, 7:48 PM CDTSevere Thunderstorm WarningEAXWorth57 min
Apr 18, 8:00 PM CDTSevere Thunderstorm WarningEAXNodaway45 min
Apr 18, 8:08 PM CDTSevere Thunderstorm WarningEAXDoniphan37 min
Apr 18, 8:19 PM CDTTornado WarningICTMcPherson41 min
Apr 18, 8:23 PM CDTSevere Thunderstorm WarningICTMarion67 min
Apr 18, 8:32 PM CDTSevere Thunderstorm WarningEAXHarrison58 min
Apr 18, 9:00 PM CDTSevere Thunderstorm WarningEAXMercer60 min

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 9.0 hours before the alert went out and 122 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, Topeka, KS at 12:00Z on 2002-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1886 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, Topeka, KS at 12:00Z on 2002-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 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
1886 J/kg
Mixed-layer CIN
-212 J/kg
Mixed-layer LCL
1049 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 182030
SEL2  
SPC WW 182026
KSZ000-MOZ000-NEZ000-190200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 112
STORM PREDICTION CENTER NORMAN OK
326 PM CDT THU APR 18 2002

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

   EASTERN AND CENTRAL  KANSAS                             
   NORTHWEST MISSOURI                           
   SOUTHEAST NEBRASKA                           

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 45 MILES SOUTH SOUTHWEST OF WICHITA KANSAS TO 55
MILES NORTHEAST OF FALLS CITY NEBRASKA.

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 110...WW 111...

DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY ALONG DRY
LINE CENTRAL KS.  WITH VERY UNSTABLE AIR MASS AND FAVORABLE SHEAR
PROFILES...SUPERCELLS ARE LIKELY.  ALONG WITH VERY LARGE
HAIL...ISOLATED TORNADOES ARE EXPECTED.  STORMS WILL MOVE NEWD OFF
DRY LINE INTO ERN KS NWRN MO BY THIS EVENING.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. 
MEAN STORM MOTION VECTOR 24030.


...HALES

370,0991 403,0962 403,0931 370,0961

WWUS20 KWNS 182030
SEL2  
SPC WW 182026
KSZ000-MOZ000-NEZ000-190200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 112
STORM PREDICTION CENTER NORMAN OK
326 PM CDT THU APR 18 2002

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

   EASTERN AND CENTRAL  KANSAS                             
   NORTHWEST MISSOURI                           
   SOUTHEAST NEBRASKA                           

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 45 MILES SOUTH SOUTHWEST OF WICHITA KANSAS TO 55
MILES NORTHEAST OF FALLS CITY NEBRASKA.

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 110...WW 111...

DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY ALONG DRY
LINE CENTRAL KS.  WITH VERY UNSTABLE AIR MASS AND FAVORABLE SHEAR
PROFILES...SUPERCELLS ARE LIKELY.  ALONG WITH VERY LARGE
HAIL...ISOLATED TORNADOES ARE EXPECTED.  STORMS WILL MOVE NEWD OFF
DRY LINE INTO ERN KS NWRN MO BY THIS EVENING.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. 
MEAN STORM MOTION VECTOR 24030.


...HALES

370,0991 403,0962 403,0931 370,0961

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 1:45 AM CDTSevere Thunderstorm WatchSPCBarber, Butler, Chase, Dickinson, Ellsworth, Geary and 12 more3 hr

Nearby

Tornado Watches in Kansas, 2002Tornado Watches in Missouri, 2002Tornado Watches in Nebraska, 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.