Several rounds of heavy rain fell mainly along and south of Interstate 70, causing flash flooding.
Every event with a place to put it. Tap one for its entry below.
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 LSX wrote it up.
Several rounds of heavy rain fell mainly along and south of Interstate 70, causing flash flooding.
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 St. Louis, MO wrote its last area forecast discussion before the first event at Jul 4, 3:16 AM CST, 2 hours 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 416 AM CDT SAT JUL 4 2009 .DISCUSSION... /415 AM CDT SAT JUL 4 2009/ MODELS HAVING A VERY DIFFICULT TIME PINNING DOWN CONVECTION TRENDS OVER REGION THIS MORNING...SO MUCH OF THE FORECAST FOR TODAY IS IS BASED ON EXTRAPOLATION OF CURRENT TRENDS. PRIMARY AREA OF MOST ACTIVE CONVECTION...AND HEAVY RAIN...HAS BECOME FOCUSED ON THE INTERSTATE 70 CORRIDOR OVER THE LAST FEW HOURS. EXPECT THIS TREND TO CONTINUE DURING THE MORNING...WITH PERHAPS A BIT OF A SWD SHIFT AS ACTIVITY BECOMES A BIT MORE OUTFLOW DOMINATED. CONTEMPLATED ISSUING A FLASH FLOOD WATCH FOR THE I-70 CORRIDOR BUT GROUND CONDITIONS ARE FAIRLY DRY WITH 3 HOUR FFG RUNNING IN THE 2.5-3 INCH RANGE...HOWEVER LOCALLIZED WATER PROBLEMS ARE CERTAINLY NOT OUT OF THE QUESTION AND WILL CONTINUE TO MONITOR THIS DURING THE MORNING. WITH THIS SWD SHIFT OF THE RAIN AXIS IT APPEARS THAT THE FLASH FLOOD THREAT HAS DIMINISHED FOR OUR N AREAS...WILL CANCEL THE FFA FOR THIS AREA BUT WILL CONTINUE MENTION OF HEAVY RAIN FOR A WHILE THIS MORNING. THIS AFTERNOON AND EVENINGS CONVECTIVE TRENDS WILL BE HEAVILY INFLUENCED BY THE REMNANTS OF THIS MORNINGS ACTIVITY. ITS CERTAINLY POSSIBLE THAT THE OUTFLOW BOUNDARY COULD BECOME THE PRIMARY FOCUS FOR THIS AFTERNOONS ACTIVITY...AND IF THAT OCCURS THE REDEVELOPMENT COULD OCCUR WELL SOUTH OF THE SYNOPTIC BOUNDARY AS INDICATED BY THE MODELS...WHICH MAY ALSO MEAN THAT THE PRECIP WILL EXIT OUR AREA THSI EVENING SOONER THAN SUGGESTED BY FROPA. BECAUSE OF THIS I STAYED A LITTLE BIT CONSERVATIVE WITH POPS IN OUR S AREAS FOR THIS AFTERNOON AND EVENING. ALSO DONT KNOW HOW MUCH AMS WILL BE ABLE TO DESTABLIZE DUE TO ALL OF THE RAIN AND CONVECTIVE CLOUD DEBRIS AND OF COURSE THIS WILL HAVE A HUGE IMPACT ON SVR TSRA THREAT THIS AFTERNOON AND EVENING...BUT CERTAINLY FAR S AREAS SHOULD HAVE THE BEST CHANCE OF MAXIMIZING AFTERNOON HEATING. ALONG THIS LINE...ITS INTERESTING TO NOTE THAT BOTH MET AND MOS GUID ARE FORECASTING A RECORD LOW MAX FOR TODAY IN STL. NO MAJOR CHANGES IN THE FORECAST AFTER TONIGHT. HOWEVER...DID ADD SOME SLIGHT CHC POPS IN N AREAS FOR MON AS MODELS ARE HINTING THAT RESIDUAL LO LVL INSTABILITY AND A BIT OF SHORTWV ENERGY MAY KICK OFF A FEW AFTERNOON TSRA IN THE DEVELOPING NW FLOW PATTERN. TRUETT && .AVIATION... /700 PM CDT FRI JUL 3 2009/ FOR THE 00Z TAFS...RESIDUAL COMPLEX OF SHOWERS AND THUNDERSTORMS ACROSS NORTHERN MISSOURI CONTINUES TO WEAKEN AND SLIDE SOUTH SOUTHEASTWARD TOWARDS TAF SITES. WILL JUST SEE MID/HI CLOUDS...MAYBE A FEW SPRINKLES...ASSOCIATED WITH THIS COMPLEX THIS EVENING. MAIN ACTION STILL EXPECTED TO EVOLVE LATER TONIGHT WHEN AN MCS/COMPLEX OF THUNDERSTORMS IS EXPECTED TO DEVELOP OVER WESTERN IOWA/NORTHWEST MISSOURI IN RESPONSE TO STRONG FORCING VIA A 50+ KT SOUTHWESTERLY LOW LEVEL JET. THIS COMPLEX SHOULD MOVE EAST SOUTHEAST ACROSS NORTHERN MISSOURI AND SOUTHERN IOWA INTO WEST CENTRAL IL DURING THE OVERNIGHT HOURS AND CONTINUE TRACKING EAST SOUTHEASTWARD TOWARDS THE OHIO VALLEY ON SATURDAY MORNING IN RESPONSE TO THE VEERING LOW LEVEL JET AND MIGRATING SHORTWAVE TROF. LOOKS LIKE A PRETTY GOOD BET THAT KUIN SHOULD BE IMPACTED BY SHRA/TSRA...TIMING CONTINUES TO BE IN QUESTION...SO BACKED OFF ON TEMPO GROUP EVEN MORE WITH 09Z-13Z TIMEFRAME. AS FOR KCOU...COULD SEE ACTIVITY THERE FROM 11Z TO 15Z AND FOR KSUS/KSTL...RWS/TRWS POSSIBLE BETWEEN 13Z-17Z. AFTER THAT ANY ACTIVITY WILL BE HARD TO PIN POINT WITH FRONTAL BOUNDARY PASSAGE...SO JUST ADDED CB/VCNTY TS MENTION WITH FRONT MOVING THROUGH AROUND 21Z AT KUIN...22Z AT KCOU AND AROUND 00Z FOR KSUS/KSTL. BYRD && .CLIMATE... RECORD LOW MAXIMUM TEMPERATURES FOR JULY 4 STL 82 IN 1990 COU 76 IN 1980 && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 500 AM CDT SAT JUL 4 2009 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-051000- GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL- MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL- CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX-LEWIS- SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE- CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN- ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON- ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS- 500 AM CDT SAT JUL 4 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WILL PUSH THROUGH THE REGION THIS MORNING WITH AREAS OF HEAVY RAIN. THIS AFTERNOON AND THIS EVENING THUNDERSTORMS ARE EXPECTED TO REDEVELOP...AND THERE IS A SLIGHT RISK THAT THESE STORMS MAY BECOME SEVERE IN AREAS ALONG AND SOUTH OF A COLUMBIA MISSOURI...LITCHFIELD ILLINOIS LINE. LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREATS...ALTHOUGH A FEW TORNADOES WILL BE POSSIBLE FOR A BRIEF PERIOD OVER SOUTHEAST MISSOURI AND SOUTHERN ILLINOIS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO SEVERE WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON...MAINLY ALONG AND SOUTH OF A COLUMBIA MISSOURI...LITCHFIELD ILLINOIS LINE. IN ADDITION...SPOTTERS ARE ASKED TO REPORT ANY HEAVY RAINFALL OR FLOODING THAT THEY OBSERVE. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 TRUETT
The St Louis radar (KLSX), 96 km away, was scanning. The volume nearest the first event began at 11:43 UTC.
3 flash flood. Local standard time, as filed.
Between 2 and 4 inches of rain with some locally higher amounts fell in a short amount of time over Callaway county. Several roads were flooded including Highway 94 between Mokane and Steedman and the intersection of Highways 94 and PP just southwest of Mokane.
Between 5 and 6 inches of rain fell in a short amount of time causing flash flooding in portions of Hermann. Frene Creek rose quickly and caused extensive damage to the driveway that leads into the Hermann Middle School parking lot. Thirty to thirty-five feet of the roadway and bridge were destroyed by the rushing waters.
Between 2 and 4 inches of rain with locally heavier amounts fell in a short amount of time causing flash flooding. Numerous roads were flooded including Bass Lane and Bonne Femme Church Road just southeast of Columbia, as well as, Blackfoot Road, Crump Lane and Highway KK.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2009Every state in 2009This day in weather historyWarnings in Missouri, 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: 188203, 188212, 188204.