A thunderstorm brought very heavy rains and flash flooding to Leavenworth County, on April 23, 2010.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EAX wrote it up.
A thunderstorm brought very heavy rains and flash flooding to Leavenworth County, on April 23, 2010.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Kansas City, MO wrote its last area forecast discussion before the first event at Apr 23, 6:30 AM CST, 2 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 730 AM CDT FRI APR 23 2010 ...UPDATED AVIATION DISCUSSION... .DISCUSSION... NUMEROUS SHOWERS AND THUNDERSTORMS WERE ACROSS THE WESTERN CWA EARLY THIS MORNING AS ISENTROPIC LIFT CONTINUES NORTH OF THE WARM FRONT... WHICH WAS LOCATED FM NERN OK TO NRN ARK. THE CONVECTION AHEAD OF THE WEAKENING SQUALL LINE IN OK WILL CONTINUE TO MOVE INTO THE CWA THIS MORNING. THE STORM WILL GRADUALLY DIMINISH LATER THIS MORNING AND LIFT NE AS THE BEST ISENTROPIC LIFT SHIFTS NE. IN ITS WAKE...A STRONG MID LVL DRY PUSH WILL ENTER KS AND WRN MO TODAY WITH THE WARM FRONT IN NRN ARKANSAS TO LIFT NORTH INTO NRN MO THIS AFTN. MEANWHILE...AN UPPER LVL LOW WILL SHIFT EAST INTO XTRM WRN KS WITH A SHORTWAVE AND STG SPEED MAX TO PIVOT AROUND THE BASE OF TROUGH AND MOVE INTO NERN KS/NWRN MO LATE THIS AFTN AND THIS EVENING. THIS SHORTWAVE WILL HELP DRIVE THE SFC DRY LINE TO NR A MHT TO EMP LINE BY 7 PM. THE ENVIRONMENT AHEAD OF THE DRY WILL BE UNCAPPED AND QUITE UNSTABLE WITH ESTIMATE SBCAPES FM 1500-2500 J/KG AND SFC-3KM CAPES AROUND 300 J/KG. ALTHOUGH THE MOISTURE CONVERGENCE IS RATHER MEAGER ALONG THE DRY LINE...SCT SUPERCELLS WILL LIKELY DEVELOP ALONG THE DRY LINE WITH THE AID OF THE WEAK SHORTWAVE. THIS REGION IS ALSO IN THE FAVORED LFQ OF THE STG H3 SPEED MAX. DEEP LAYER SHEAR OF 40-50 KTS WILL BE PRESENT IN ERN KS/WRN MO DURING THE AFTN/EVENING HOURS WITH SFC-1KM/SFC-3KM SHR HELICITIES FROM 100-250 M2/SE. LOW LEVEL HELICITIES WILL BE ENHANCE NR THE JUXTAPOSITION OF THE WARM FRONT AND DRY LINE OVER XTRM NERN KS/SE NE EAST TO JUST NORTH OF THE IOWA BORDER. IN THE UNCAPPED ENV...THE STORMS MAY DEVELOP AS EARLY AS 2 PM FM CNK TO ICT AND SHIFT QUICKLY NE INTO THE XTRM WRN CWA BETWEEN 5 AND 8 PM. THIS TIMING WILL PLACE THE EXTREME WRN CWA AS HAVING THE GREATEST RISK OF SEVERE WEATHER...WHICH INCLUDES THE POTENTIAL FOR TORNADOES...LARGE HAIL AND DAMAGING WINDS. AT THIS TIME...THE GREATEST TORNADIC THREAT IS FROM KANSAS CITY TO ST JOSEPH TO MARYVILLE...WHERE THE MORE BACK LOW LEVEL WIND PROFILES ARE MORE FAVORABLE. OTHERWISE..IT IS UNLIKELY THAT THE WRM FRONT WILL BE ABLE TO TRIGGER ANY THUNDERSTORMS ACROSS MUCH OF MISSOURI THIS AFTERNOON AS INSTABILITY IS POOR. AS THE STORMS MOVE INTO WRN MO THIS EVENING...INSTABILITY WILL DIMINISH WITH THE SHEAR PROFILES GRADUALLY BECOMING UNFAVORABLE AS MID LEVEL WINDS BACK WITH THE APPROACH OF THE UPPER LEVEL LOW. REGARDLESS...THE EVENING CONVECTION MAY REMAIN SEVERE SHORTLY AFTER MIDNIGHT AS THE STORMS ENTER THE ERN CWA. BY AROUND MIDNIGHT...THE THREAT WILL BE DAMAGING WINDS AND LARGE HAIL. THE DRY LINE WILL HOLD OVERNIGHT IN ERN KS BUT THE MOISTURE WILL BECOME SHALLOW AS A STG H8 DRY PUSH SURGES ACR MISSOURI. ON SATURDAY...THE UPPER LEVEL LOW DRIFTS INTO ERN KS WITH THE DEPTH OF GULF MOISTURE GRADUALLY IMPROVING. SCATTERED THUNDERSTORMS WILL DEVELOP THROUGHOUT THE CWA AS VERY COLD MID LVL TEMPS AROUND -20C WILL BE PRESENT. SBCAPES OF AROUND 1500 J/KG CAN LIKELY BE ACHIEVED WITH LARGE HAIL THE PRIMARY SEVERE WEATHER THREAT. HAVE SOME CONCERN ABOUT THE POTENTIAL FOR MINI-SUPERCELL DEVELOPMENT...BUT THE QUALITY OF SHEAR IS SOMEWHAT IN QUESTION. THE CONVECTION WILL DIMINISH FM WEST TO EAST SATURDAY NIGHT AS A COLD FRONT MOVES THROUGH THE CWA. WILL MAINTAIN THE FLOOD WATCH AT THIS TIME...AS THERE IS THE POTENTIAL FOR LOCALLY HEAVY RAINFALL...ESPECIALLY EARLY THIS MORNING. DB && .AVIATION... FOR THE 12Z TAFS...NUMEROUS SHOWERS AND THUNDERSTORMS WILL AFFECT THE TERMINALS EARLY THIS MORNING AS WARM AND MOIST AIR SURGES NORTH AHEAD OF A WARM FRONT ALONG THE MISSOURI AND ARKANSAS BORDER. THE STORMS WILL QUICKLY NE BY MID-MORNING WITH THE BACK EDGE OF THE PRECIPITATION ALREADY MOVING INTO ERN KS. LOCALIZED IFR CONDITIONS ARE POSSIBLE WITH THE PRECIPITATION. ONCE THE RAIN CLEARS...QUESTION IS WHETHER A MVFR STCU/CU WILL DEVELOP. CIG HEIGHTS AND TIMING ARE SOMEWHAT IN QUESTION...BUT WITH INCREASING TEMPS...MVFR CLOUD DECK WILL LIKELY DEVELOP BY NOON. NEXT CONCERN IS THE POTENTIAL FOR SEVERE THUNDERSTORMS VERY LATE THIS AFTERNOON AND EVENING AS A STORM SYSTEM APPROACHES. THE BEST TIMING AT THE CURRENT TIME IS BETWEEN 22Z AND 02Z. AFTER THE STORMS MOVE THROUGH...VFR CONDITIONS ARE EXPECTED. DB && .EAX WATCHES/WARNINGS/ADVISORIES... MO...FLOOD WATCH THROUGH LATE TONIGHT FOR MOZ037-038-043-044-053-054. KS...FLOOD WATCH THROUGH LATE TONIGHT FOR KSZ057-060-103>105. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 604 AM CDT FRI APR 23 2010 KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040- 043>046-053-054-241115- ATCHISON KS-MIAMI-LINN KS-DONIPHAN-LEAVENWORTH-WYANDOTTE- JOHNSON KS-ATCHISON MO-NODAWAY-WORTH-GENTRY-HARRISON-MERCER- PUTNAM-SCHUYLER-HOLT-ANDREW-DE KALB-DAVIESS-GRUNDY-SULLIVAN-ADAIR- BUCHANAN-CLINTON-CALDWELL-LIVINGSTON-LINN MO-MACON-PLATTE-CLAY- RAY-CARROLL-CHARITON-RANDOLPH-JACKSON-LAFAYETTE-SALINE-HOWARD- CASS-JOHNSON MO-PETTIS-COOPER-BATES-HENRY- 604 AM CDT FRI APR 23 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL AND WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY THIS MORNING. ALTHOUGH NO SEVERE WEATHER IS EXPECTED THIS MORNING...A FEW STORMS MAY PRODUCE SMALL HAIL SOUTH OF INTERSTATE 70. THE MORNING ACTIVITY WILL DIMINISH BY EARLY THIS AFTERNOON. BY LATE THIS AFTERNOON...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG A DRY LINE IN EASTERN KANSAS WITH THE STORMS TO MOVE NORTHEAST INTO EXTREME WESTERN MISSOURI BY LATE THIS AFTERNOON OR THIS EVENING. THE STORMS MAY PRODUCE A FEW TORNADOES AS WELL AS LARGE HAIL AND DAMAGING WINDS. THE THUNDERSTORMS WILL CONTINUE TO PROGRESS EAST THROUGH THE REST OF THE OUTLOOK AREA DURING THE NIGHT. HOWEVER...THE SEVERE THREAT WILL GRADUALLY DIMINISH BY LATE EVENING AS THE STORMS APPROACH A KIRKSVILLE TO MOBERLY LINE SHORTLY AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY AN UPPER LEVEL LOW WILL MOVE ACROSS MISSOURI ON SATURDAY. SCATTERED THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON AND EVENING HOURS WITH LARGE HAIL POSSIBLE. AN ISOLATED TORNADO IS POSSIBLE...BUT THE THREAT APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON AND TONIGHT.
The Pleasant Hill radar (KEAX), 69 km away, was scanning. The volume nearest the first event began at 14:31 UTC.
1 flash flood. Local standard time, as filed.
Plum Creek Road and 335th Street, were closed due to flowing water over the road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2010Every state in 2010This day in weather historyWarnings in Kansas, April 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 226102.