Several areas of thunderstorms moved through central and east central Missouri dumping between 2 and 3 inches of rain with isolated reports in excess of 4 inches. This caused some isolated flash flood reports.
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 areas of thunderstorms moved through central and east central Missouri dumping between 2 and 3 inches of rain with isolated reports in excess of 4 inches. This caused some isolated flash flood reports.
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 Sep 20, 2:38 AM CST, 1 hour 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 338 AM CDT SUN SEP 20 2009 .DISCUSSION... /335 AM CDT SUN SEP 20 2009/ LARGE SCALE LIFT IN ADVANCE OF A WEAK SHORTWV TROF ROTATING ENE THRU ERN KS/ERN OK AND SUSTAINED LOW LEVEL MOISTURE CONVERGENCE HAVE BEEN RESPONSIBLE FOR A GROWING AREA OF RAIN AND EMBEDDED THUNDERSTORMS ACROSS CENTRAL PORTIONS OF MO. SOME DECENT RAINFALL AMOUNTS HAVE BEEN OCCURING WITH THE THUNDERSTORMS IN SOUTH CENTRAL MO WHERE RAFL RATES ARE SEVERAL INCHES/HR. THE WHOLE PCPN AREA IS PRESENTLY LIFTING NWD AND SHOULD SWING EWD THIS MORNING AS WELL...AS THE AFOREMENTIONED SHRTWV TROF AND ACCOMPANYING LOW LEVEL CIRCULATIONS LIFT NEWD. THIS WILL RESULT IN LIKELY POPS IN MOST LOCATIONS TODAY. BY EARLY THIS EVENING I THINK ANY PCPN THREAT THAT LINGERS WILL BE PRIMARILY ACROSS IL IN CONJUNCTION WITH THE BETTER LOW LEVEL FORCING. GUIDANCE SUGGESTS THERE WILL BE QUITE A BIT OF CLOUDINESS IN THE WAKE OF THE PCPN...WITH STRATUS AND FOG DEVELOPING WHERE ANY CLEARING OR BREAKS OCCUR. I THINK MONDAY FOR THE MOST PART WILL BE A DRY DAY WITH MAINLY MORNING CLOUDS AND FOG. THERE CUD BE A RESIDUAL SHOWER EARLY OVER FAR SOUTH CENTRAL IL. ACROSS CENTRAL MO I THINK THE MAJORITY OF PCPN ASSOCIATED WITH THE NEXT CDFNT AND DEEPENING TROF WILL HOLD OFF UNTIL MONDAY NIGHT. LOOKS LIKE THE CDFNT WILL BE A SLOW MOVER GIVEN THE AMPLICATION OF THE PLAINS TROF/CLOSED LOW DEVELOPMENT... WHICH SHOULD KEEP THE THREAT OF PCPN IN THE FORECAST THROUGH AT LEAST TUESDAY NIGHT ACROSS PORTIONS OF ERN MO AND WRN IL. BEYOND THAT PERIOD THERE IS QUITE A BIT OF UNCERTAINTY TO THE FORECAST DUE TO THE FUTURE OF THE CLOSED LOW...AND DIDNT MAKE ANY CHANGES...ALTHO ANOTHER SURGE OF PCPN IS PSBL IN THE THURS NIGHT/FRI TIME FRAME. TEMPS WILL BE SURPRESSED TODAY DUE TO CLOUDS AND PCPN WITH DECENT RECOVERY ON MONDAY AFTER THE CLOUDS/FOG BREAK-UP. GLASS && .AVIATION... /1141 PM CDT SAT SEP 19 2009/ FOR THE 06Z TAFS...SCATTERED SHOWER ACTIVITY IS PERSISTING OVER THE REGION AS IT MAKES ITS WAY NORTHWARD TOWARDS KCOU/KSUS/KSTL...SO KEPT VCSH MENTION THROUGH 13Z. OTHERWISE...MAIN FORECAST ISSUE WILL BE CEILINGS LATER TODAY AS WEAK SURFACE LOW LIFTS NORTHEASTERLY AND WEAKENS WITH TIME. WITH SO MUCH LOW LEVEL MOISTURE WOULD NOT BE SURPRISED TO SEE SOME MVFR STRATUS AND/OR FOG FOR PORTIONS OF THE AREA...ESPECIALLY TOWARDS 01Z...THOUGH HAVE SCATTERED MENTION OF STRATUS AS EARLY AS 13Z THIS MORNING AT KSUS/KSTL. WILL NEED TO KEEP A WATCHFUL EYE ON THE POSSIBLE LOW CIGS/VSBYS LATER TODAY AND TONIGHT. BYRD && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 438 AM CDT SUN SEP 20 2009 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-211100- 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- 438 AM CDT SUN SEP 20 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 ISOLATED OR SCATTERED THUNDERSTORMS WILL BE POSSIBLE OVER PARTS OF THE AREA TODAY. SEVERE WEATHER IS NOT EXPECTED...HOWEVER THE THUNDERSTORMS COULD PRODUCE SOME LOCALLY HEAVY DOWNPOURS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS ALSO A CHANCE OF THUNDERSTORMS OVER CENTRAL AND NORTHEAST MISSOURI ON MONDAY NIGHT. THE THREAT OF THUNDERSTORMS WILL SPREAD ACROSS THE ENTIRE AREA ON TUESDAY AND TUESDAY NIGHT AS A SLOW MOVING STORM SYSTEM IMPACTS THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO RELAY ANY RAINFALL AMOUNTS GREATER THAN ONE INCH. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 GLASS
The St Louis radar (KLSX), 131 km away, was scanning. The volume nearest the first event began at 10:01 UTC.
2 flash flood. Local standard time, as filed.
Between 2 and 4 inches of rain fell in a short amount of time causing flash flooding. Numerous roads and low water crossing were flooded including several streets in Jefferson City.
Between 3 and 5 inches of rain fell in a short amount of time over Franklin county causing flash flooding. Several roads were flooded including roads near the city park in Union and roads in the Washington area.
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, September 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: 193767, 193768.