Alert archive / Kansas / Tornado Watches in 2001

Tornado Watch 718

September 7, 200122 counties in Kansas; 21 counties in Missouri; Richardson County, Nebraska

The Storm Prediction Center issued this tornado watch at Sep 7, 2001, 6:00 PM CDT for 22 counties in Kansas; 21 counties in Missouri; Richardson County, Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 7, 2001, 6:00 PM CDT (23:00 UTC)
Expired
Sep 7, 2001, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 44 counties

Atchison County, KS, Brown County, KS, Chase County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Lyon County, KS, Marion County, KS, Miami County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Jackson County, MO, Livingston County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Ray County, MO, Sullivan County, MO, Worth County, MO, Richardson County, NE

The radar

The Topeka radar (KTWX), 52 km from the middle of the area, began a volume at 23:01 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

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

IssuedProductOfficeCountiesLasted
Sep 7, 6:15 PM CDTTornado WarningTOPPottawatomie, Riley30 min
Sep 7, 6:46 PM CDTSevere Thunderstorm WarningOAXRichardson44 min
Sep 7, 6:54 PM CDTSevere Thunderstorm WarningEAXAtchison66 min
Sep 7, 7:02 PM CDTSevere Thunderstorm WarningTOPFranklin, Osage28 min
Sep 7, 7:02 PM CDTSevere Thunderstorm WarningTOPLyon28 min
Sep 7, 7:30 PM CDTSevere Thunderstorm WarningTOPAnderson, Douglas, Franklin, Osage30 min
Sep 7, 7:30 PM CDTSevere Thunderstorm WarningTOPShawnee30 min
Sep 7, 7:32 PM CDTSevere Thunderstorm WarningEAXJohnson, Miami43 min
Sep 7, 7:44 PM CDTSevere Thunderstorm WarningTOPJefferson31 min
Sep 7, 7:53 PM CDTSevere Thunderstorm WarningEAXLeavenworth, Wyandotte67 min
Sep 7, 8:03 PM CDTSevere Thunderstorm WarningEAXJackson57 min
Sep 7, 8:14 PM CDTSevere Thunderstorm WarningEAXClay, Platte46 min
Sep 7, 8:15 PM CDTSevere Thunderstorm WarningEAXJohnson, Miami45 min
Sep 7, 8:34 PM CDTSevere Thunderstorm WarningEAXCaldwell41 min
Sep 7, 8:43 PM CDTSevere Thunderstorm WarningEAXRay62 min
Sep 7, 9:31 PM CDTSevere Thunderstorm WarningEAXLivingston44 min
Sep 7, 9:46 PM CDTSevere Thunderstorm WarningEAXGrundy, Sullivan59 min

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.0 hours before the alert went out and 20 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 2001-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1545 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 2001-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.193958Sfc1 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
1545 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

957 
WWUS9 KMKC 072301
SEL8  
MKC WW 072253
KSZ000-MOZ000-NEZ000-080400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 718
STORM PREDICTION CENTER NORMAN OK
553 PM CDT FRI SEP 7 2001

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

   NORTHERN AND EASTERN KANSAS                             
   NORTHERN AND WESTERN MISSOURI                           
   EXTREME SOUTHEAST NEBRASKA                           

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 600 PM UNTIL 1100
PM 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 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 5 MILES SOUTH SOUTHWEST OF EMPORIA KANSAS TO 30
MILES NORTHWEST OF SPICKARD 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...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 714.  WATCH NUMBER 714 WILL NOT BE IN
EFFECT AFTER 600 PM CDT.  CONTINUE...WW 715...WW 716...WW 717...

DISCUSSION...SUPERCELLS EXPECTED TO CONTINUE DEVELOPING OVER WATCH
AREA AS SW KS UPPER VORT EJECTS NEWD THIS EVENING.  ABSENCE OF
STRONG LOW LEVEL LINEAR FORCING HAS ALLOWED INDIVIDUAL STORMS TO
REMAIN DISTINCT.  SURFACE PRESSURE FALLS CONCENTRATED OVER SE KS
ATTM SUGGEST THAT LOW LEVEL WINDS WILL REMAIN SOMEWHAT BACKED AHEAD
OF EJECTING UPPER DISTURBANCE.  COUPLED WITH LOW LCLS...SOME THREAT
WILL EXIST FOR ISOLATED TORNADOES IN ADDITION TO LARGE HAIL/HIGH
WINDS. 

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 24035.

...CORFIDI

403,0923 381,0944 381,0974 403,0953

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 7, 1:30 AM CDTSevere Thunderstorm WatchSPCCloud, Jewell, Mitchell, Osborne, Phillips, Republic and 2 more6 hr
Sep 7, 2:00 PM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Chase, Clay, Dickinson, Doniphan and 18 more6 hr
Sep 7, 3:15 PM CDTTornado WatchSPCButler, Chautauqua, Cowley, Elk, Greenwood, Harper and 5 more6 hr
Sep 7, 4:45 PM CDTSevere Thunderstorm WatchSPCClay, Cloud, Dickinson, Ellis, Ellsworth, Geary and 15 more3 hr
Sep 6, 11:00 PM CDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boyd, Buffalo, Custer, Dawson and 16 more3 hr

Nearby

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