A thunderstorm with torrential rain, produced flash flooding in the late evening hours, of July 27, 2009.
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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 with torrential rain, produced flash flooding in the late evening hours, of July 27, 2009.
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 Jul 27, 5:44 PM CST, 2 hours 46 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 644 PM CDT MON JUL 27 2009 ...UPDATED AVIATION DISCUSSION... .DISCUSSION... /338 PM CDT MON JUL 27 2009/ THREAT OF CONVECTION CONTINUES TO BE THE MAIN CONCERN IN THE SHORT TERM. MANY BOUNDARIES EXIST ACROSS THE CENTRAL PLAINS...NOT UNUSUAL FOR A WEAK SHEAR ENVIRONMENT. A WEAK OUTFLOW BOUNDARY APPEARS TO HAVE SHIFTED NORTH INTO CENTRAL AND EASTERN KANSAS...IN THE WAKE OF THE MORNING CONVECTION IN OKLAHOMA. THIS BOUNDARY WAS TRIGGERING PULSE SUMMER-LIKE CONVECTION IN CNTRL AND ERN KS WITH ONLY SMALL HAIL AND WIND GUSTS TO 40 MPH REPORTED. THIS CONVECTION HAS SHOWN A SLIGHT EWD DEVELOPMENT DURING THE LAST COUPLE OF HOURS. SBCAPES OVER THE CWA ARE AROUND 1500-2000 J/KG WITH SHEAR ALSO REMAINING QUITE WEAK. SINCE THE BOUNDARY OVER KS IS DIFFICULT TO LOCATE AS IT STRETCHES NE IN WCNTRL MO...THE CHCS OF CONVECTION FOR THE WRN CWA LOOK LOW. WL CONTINUE TO MONITOR. IN ADDITION...THE WEAK OUTFLOW BOUNDARY WHICH WAS PRESENT OVER SERN NEB IS ALSO WEAKENING. SHORT TERM CONVECTIVE DEVELOPMENT CHCS IN SERN NEBRASKA AND SWRN IA LOOK LOW AT THIS TIME...DUE TO COOLER TEMPERATURES UNDER CLOUD COVER. CONVECTIVE CHCS INCREASE LATE TONIGHT AS A SHORTWAVE MOVES ESE FM WRN NEBRASKA AND THE COLD FRONT FM CNTRL TO NERN NEB CONTINUES TO SAG EAST. DIFFICULT TO DETERMINE THE EXTENT OF THE CONVECTION TONIGHT AS THE LLJ WILL BE QUITE WEAK WITH MUCAPES AROUND 1000-1500 J/KG. SHEAR WILL ALSO BE WEAK. LAPSE RATES ARE ALSO MEDIOCRE BUT WITH LITTLE CAP PRESENT...CONVECTIVE CHCS FOR THE NRN GRIDS LATE TONIGHT LOOK GOOD. DO NOT EXPECT A WIDESPREAD SVR WX EVENT LATE TONIGHT...BUT CANNOT RULE OUT AN ISOLATED STG TO SVR STORM. THE BOUNDARY WILL SLOW ON TUESDAY AS IT APPROACHES I-70. THIS IS DUE TO ANOTHER SHORTWAVE THAT IS SHEARING SE FM WYOMING. REDEVELOPMENT ON TUESDAY IS HEAVILY DEPENDENT UPON THE DEGREE OF DEVELOPMENT TONIGHT. REGARDLESS THE SHORTWAVE SHOULD INITIATE FRONTAL AND POST FRONTAL SHOWERS AND THUNDERSTORMS. THE STORMS WILL EXIT THE CWA TUESDAY NIGHT AS THE FRONT DROPS INTO SRN MO AND ARK. MODELS CONTINUE TO ADVERTISE ANOTHER SHORTWAVE APPROACHING THE CWA WED NGT. THE DEGREE OF QUALITY MOISTURE RETURN IS QUESTIONABLE GIVEN THE WEAK RETURN FLOW. HOWEVER...WITH WEAK INSTABILITY AND WEAK ISENTROPIC LIFT...WL CONTINUE WITH CHC POPS AT THIS TIME. DB .MEDIUM RANGE... GFS AND ECMWF ARE CONTINUING TO DEPICT NW UPPER FLOW THROUGH THE PERIOD. HOWEVER...THE GFS IS QUICKER IN LIFTING THE NERN US TROF NE...WHILE DRIVING AN UPPER LEVEL LOW OFF THE CALIFORNIA COAST INLAND. THE SCENARIO OF THE WRN TROUGH IS NOT FAVORED FOR THIS TIME OF YEAR. PREFER THE MORE WWD ECMWF SOLUTION...ESPECIALLY SINCE THIS HAS BEEN THE FLOW REGIME FOR THE PAST 2-3 WEEKS. THE ECMWF WILL CONTINUE TO ROTATE SHORTWAVES SE THROUGH THE CWA DURING THE MEDIUM RANGE WITH PERIODIC FRONTAL PASSAGES. IT IS IMPOSSIBLE TO PREDICT THE TIMING OF THESE FEATURES. AS A RESULT...WILL KEEP POPS IN THE SLIGHT CATEGORY FOR MUCH OF THE PERIOD. GIVEN THE FLOW REGIME AND PERIODIC FRONTS...TEMPERATURES WILL CONTINUE TO BE BELOW NORMAL. DB && .AVIATION... FOR THE 00Z TAFS...LOW CONFIDENCE IN THIS FORECAST. MODELS ARE STRUGGLING TO HANDLE THE ONGOING CONVECTION. WILL LEAN TOWARD THE RUC FOR THE SHORTER TERM DETERMINATION OF CONVECTION. PREFRONTAL TROUGH LOCATED IN SERN NEBRASKA HAS STRUGGLED TO GET CONVECTION GOING...WHILE THE MORE DIURNALLY DRIVEN CONVECTION IN EASTERN KANSAS THAT HAS BEEN OCCURRING ON A WEAK BOUNDARY...IS SHOWING SIGNS OF SOME SUSTAINABILITY INTO THE EVENING HOURS. WILL PLACE A VCTS IN THE TAFS THIS EVENING TO COVER THE POTENTIAL OF THIS CONVECTION HOLDING TOGETHER TO MAKE IT NEAR THE TAF SITES. OVERNIGHT WILL STILL GO WITH THE IDEA OF CONVECTION WITH THE COLD FRONT IN NRN NEBRASKA MOVING INTO NORTHWEST MISSOURI...AIDED BY THE SHORT WAVE MOVING SOUTHEAST ACROSS NEBRASKA THIS EVENING. PERIODS OF CONVECTION MAY ALSO LINGER IN THE POST FRONTAL AREA AFTER DAYBREAK ON TUESDAY WITH ADDITIONAL WAVES IN THE NORTHWEST FLOW. PC && .EAX WATCHES/WARNINGS/ADVISORIES... MO...NONE. KS...NONE.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 1259 PM CDT MON JUL 27 2009 KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040- 043>046-053-054-281800- 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- 1259 PM CDT MON JUL 27 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL AND WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS WILL BE POSSIBLE ACROSS NORTHEASTERN KANSAS AND EXTREME NORTHWESTERN MISSOURI LATE THIS AFTERNOON AND EVENING AS A COLD FRONT APPROACHES THE OUTLOOK AREA FROM THE NORTH. THE THREAT FOR STRONG TO ISOLATED SEVERE THUNDERSTORMS IS ALONG AND NORTH OF A LINE FROM ST JOSEPH TO BETHANY. THE PRIMARY THREATS ARE LARGE HAIL AND DAMAGING WINDS. THIS COLD FRONT WILL SLOWLY CRAWL SOUTHWARD INTO NORTHERN MISSOURI AND KANSAS LATE TONIGHT. PERIODIC SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THROUGH THE NIGHT ESPECIALLY IN AREAS NORTH OF INTERSTATE 70. ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY THREATS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE COLD FRONT WILL FINALLY PUSH THROUGH THE OUTLOOK AREA DURING THE DAY ON TUESDAY. A STRONGER UPPER LEVEL DISTURBANCE WILL LEAD TO THE DEVELOPMENT OF ADDITIONAL THUNDERSTORMS ALONG AND AHEAD OF THE COLD FRONT TUESDAY AFTERNOON. AT THIS TIME THE PROBABILITY OF SEVERE WEATHER REMAINS LOW...HOWEVER A STRONG STORM OR TWO CANNOT BE RULED OUT. THERE WILL BE AN ADDITIONAL CHANCE FOR THUNDERSTORMS WEDNESDAY NIGHT INTO THURSDAY. SEVERE WEATHER IS NOT EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED NORTH OF A LINE FROM ST JOSEPH TO BETHANY LATE THIS AFTERNOON AND THIS EVENING. SPOTTER ACTIVATION IS NOT ANTICIPATED LATER TONIGHT AND TUESDAY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 446 PM CDT MON JUL 27 2009 KSZ060-MOZ053-272215- BATES-LINN- 446 PM CDT MON JUL 27 2009 ...SIGNIFICANT WEATHER ALERT FOR EASTERN LINN AND WESTERN BATES COUNTIES UNTIL 515 PM CDT... AT 441 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR PLEASANTON. THIS STORM WAS NEARLY STATIONARY. WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. PEOPLE IN BATES AND LINN COUNTIES...INCLUDING THE CITY OF PLEASANTON...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. LAT...LON 3827 9468 3818 9451 3807 9464 3818 9479 CDB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 831 PM CDT MON JUL 27 2009 KSZ057-280200- MIAMI- 831 PM CDT MON JUL 27 2009 ...SIGNIFICANT WEATHER ALERT FOR NORTHERN MIAMI COUNTY UNTIL 900 PM CDT... AT 830 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR PAOLA...MOVING EAST AT 10 MPH. WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. VERY HEAVY RAIN IS ALSO LIKELY WITH THIS STORM. THIS STORM WILL BE NEAR... PAOLA AROUND 850 PM CDT. THE TOWNS OF HILLSDALE...WAGSTAFF AND CHILES ARE ALSO IN THE PATH OF THIS STORM. LAT...LON 3872 9470 3849 9477 3857 9503 3872 9498 CDB
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
851 PM CDT MON JUL 27 2009
KSZ104-MOZ028-029-037-280215-
CLAY-JACKSON-PLATTE-WYANDOTTE-
851 PM CDT MON JUL 27 2009
...SIGNIFICANT WEATHER ALERT FOR EASTERN WYANDOTTE...SOUTHEASTERN
PLATTE...SOUTHWESTERN CLAY AND WESTERN JACKSON COUNTIES UNTIL 915 PM
CDT...
AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR KANSAS CITY KANSAS...MOVING NORTHEAST AT 15
MPH.
WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. VERY HEAVY RAIN IS
ALSO EXPECTED WITH THIS STORM.
THIS STORM WILL BE NEAR...
KANSAS CITY DOWNTOWN...RIVERSIDE...HOUSTON LAKE AND KANSAS CITY
AROUND 900 PM CDT.
NORTHMOOR AND NORTH KANSAS CITY AROUND 905 PM CDT.
AVONDALE AND RAYTOWN AROUND 910 PM CDT.
GLADSTONE...OAKVIEW...CLAYCOMO AND PLEASANT VALLEY AROUND 915 PM
CDT.
THE TOWNS OF BEVERLY HILLS...OAKS...OAKWOOD...OAKWOOD PARK...RANDOLPH
AND BIRMINGHAM ARE ALSO IN THE PATH OF THIS STORM.
LAT...LON 3923 9476 3923 9441 3900 9443 3903 9461
3904 9461 3904 9462 3904 9472 3905 9477
CDBThe Pleasant Hill radar (KEAX), 50 km away, was scanning. The volume nearest the first event began at 02:29 UTC.
2 flash flood. Local standard time, as filed.
Street flooding was reported at Southwest Boulevard, near Turkey Creek.
People had to be rescued from their cars, at 14th Street and Washington Avenue. Cars were reported to have been nearly submerged, by the flood waters.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2009Every state in 2009This day in weather historyWarnings in Kansas, July 2009
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: 188285, 188286.