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, 10:36 PM CST, 3 hours 9 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 1136 PM CDT SAT JUL 4 2009 .UPDATE... /803 PM CDT SAT JUL 4 2009/ PERSISTENT SHRA/TSRA REMAIN NEAR THE CDFNT/WRMFNT SYSTEM THAT IS DRAPED OVER THE FA AND ALONG WITH THE LO PRES THAT IS LOCATED ENE OF KCOU. THIS WILL TAKE MUCH OF THE EVENING AND PERHAPS EVEN THE EARLY OVERNIGHT TO FULLY EXIT THE FA...AND IN LIGHT OF THESE TRENDS ALSO OBSERVED ON RADAR...HAVE EXTENDED THE SCT/ISOLD RAIN PROBS THRU MUCH OF THE NIGHT. TES && .DISCUSSION... /326 PM CDT SAT JUL 4 2009/ THE REMNANTS OF THE MCS FROM EARLIER TODAY HAVE WEAKENED AND MOVED EAST LEAVING A RESIDUAL BNDRY DRAPED ACROSS SOUTHEAST/EAST CENTRAL MISSOURI...WHILE THE SYNOPTIC SCALE CDFNT STILL REMAINS WEST OF THE CWA WITH THE SFC LOW IN NW MO AND WARM FRONT EXTENDING INTO CENTRAL IL. CLOUDS AND PCPN HOWEVER HAVE STABILIZED THE AIR MASS QUITE A BIT IN THE WAKE OF THE MCS AND ONLY SWRN FRINGES OF THE CWA AND NW MO HAVE SHOWN MUCH RECOVERY. LARGE SCALE ASCENT ASSOCIATED WITH THE SHORT WAVE TROF NOW MOVING INTO ERN MO HAS ALSO SPREAD INTO FAR SE MO AND SRN IL...WITH WEAK SUBSIDENCE BEGINNING TO OVERSPREAD MUCH OF THE CWA IN ITS WAKE. SO THE BIG QUESTION FOR THIS EVENING IS WHAT IS THE REMAINING PCPN THREAT AS THE COLD FRONT MOVES SOUTHEAST ACROSS THE AREA. WHILE THE AIR MASS ACROSS THE AREA STILL HAS SOME TIME FOR RECOVERY...THE WEAK LARGE SCALE SUBSIDENCE DOES NOT BODE WELL FOR PRECIPITATION COVERAGE. CURRENT THOUGHT IS THAT THE THREAT REMAINS FOR ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS THROUGH MAINLY THE FIRST PART OF THE EVENING...ASSOCIATED WITH WEAK BOUNDARY LAYER CONVERGENCE...AND MAINLY ACROSS THE SRN PART OF THE CWA. THERE IS ALREADY QUITE A BIT OF CLOUDINESS AND THIS DOESNT LOOK LIKE IT WILL CHANGE SOON WHEN VIEWING THE AMOUNT OF STRATUS IN THE WAKE OF THE COLD FRONT. THIS CLOUD COVER SHOULD ADVECT INTO THE AREA TONIGHT...WITH OVERCAST SKIES EXPECTED AT DAYBREAK ON SUNDAY. THIS CLOUD COVER SHOULD SLOWLY CLEAR FROM THE NORTH ON SUNDAY WITH SE MO AND SRN IL NOT SEEING MUCH SUNSHINE UNTIL THE AFTERNOON. THE COMBO OF THE CLOUDS AND NELY LOW LEVEL FLOW WILL RESULT IN ANOTHER DAY OF COOL TEMPS BY JULY STANDARDS. HIGH PRESSURE WILL THEN DOMINATE THE AREA SUNDAY NIGHT INTO MONDAY WITH TEMPS REMAINING BLO NORMAL. MODERATION SHOULD GET UNDERWAY ON TUESDAY AS THE LOW LEVEL ANTICYCLONE RETREATS AND A MORE SLY WIND COMPONENT AND WAA DEVELOP. THE UPPER RIDGE ANCHORED OVER THE DESERT SOUTHWEST IS FORECAST TO BUILD EASTWARD THROUGH THE SOUTHERN PLAINS AND INTO THE LOWER AND MIDDLE MISSISSIPPI VALLEY REGION DURING THE LATER HALF OF THE UPCOMING WEEK. THIS SHOULD RESULT IN A SEVERAL DAY PERIOD OF HEAT MORE TYPICAL OF JULY WITH HIGHS WELL INTO THE 90S. INTERESTINGLY THE GFS ENSEMBLE MEAN HAS WARMER H85 TEMPS THAN BOTH THE OPERATIONAL GFS AND ECMWF DURING THIS PERIOD. HOW LONG THE HEAT WILL STAY IS A BIT IN QUESTION. THE LATEST GUIDANCE IS SUGGESTING THE LONGEVITY OF THE EASTWARD EXTENSION OF THE RIDGE AND ASSOCIATED HEAT WILL BE SOMEWHAT SHORT-LIVED...WITH AN UPPER TROF DEVELOPING IN THE EASTERN U.S. AND NW FLOW ALOFT/A COLD FROPA ACROSS OUR AREA LATE FRIDAY/EARLY SAT. ATTM INTRODUCED SOME SLIGHT CHANCE POPS DURING THIS TIME FRAME AND LOWER TEMPS INTO SATURDAY. GLASS && .AVIATION... /1129 PM CDT SAT JUL 4 2009/ FOR THE 06Z TAFS...VISBYS AT STL/SUS SHUD IMPROVE SLIGHTLY IN THE NEXT COUPLE OF HOURS...BUT EXPECTED TO REMAIN MVFR OVERNIGHT. VISBYS AT UIN WILL LIKELY ALSO DROP TO MVFR WITH ALL SITES KEEPING IFR CIGS OVERNIGHT AS SURFACE LOW PULLS EWD SLOWLY. CIGS WILL GRADUALLY IMPROVE LATE SUNDAY MORNING WITH CU DEVELOPING ALONG THE NRN EDGE OF CLOUD DECK. THIS CU FIELD SHUD GRADUALLY LIFT TO VFR DURING THE AFTERNOON HOURS. AS THE LOW PULLS OUT OF THE REGION...SKIES WILL CLEAR OUT WITH LIGHT AND VRB WINDS SUN NIGHT. TILLY && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1150 PM 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>075-084-085-099-051200- 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- 1150 PM 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...TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS FOR AREAS AROUND THE ST. LOUIS METRO AREA AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST ILLINOIS. SEVERE WEATHER IS NOT EXPECTED. PATCHY FOG WILL EXIST...REDUCING VISIBILITIES TO ONE MILE OR LESS AT TIMES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY HOT WEATHER IS EXPECTED TO RETURN DURING THE LATER HALF OF THE UPCOMING WEEK WITH AFTERNOON HEAT INDEX VALUES IN EXCESS OF 100 DEGREES BY FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 TES
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
849 PM CDT SAT JUL 04 2009
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0835 PM FUNNEL CLOUD ST. MARY 37.88N 89.95W
07/04/2009 STE. GENEVIEVE MO TRAINED SPOTTER
SPOTTER REPORTED A FUNNEL CLOUD MOVING UP AND DOWN FROM
THE CLOUD BASE...AND NEVER SAW IT TOUCH DOWN
&&
EVENT NUMBER LSX0902545
JPSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 947 PM CDT SAT JUL 4 2009 MOZ060>062-050330- FRANKLIN MO-ST. CHARLES MO-WARREN MO- 947 PM CDT SAT JUL 4 2009 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN WARREN... SOUTHWESTERN ST. CHARLES AND NORTHEASTERN FRANKLIN COUNTIES UNTIL 1030 PM CDT... AT 947 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR DUTZOW...OR 6 MILES NORTH OF WASHINGTON... MOVING SOUTHEAST AT 15 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...DUTZOW AND AUGUSTA. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
The St Louis radar (KLSX), 116 km away, was scanning. The volume nearest the first event began at 07:46 UTC.
1 flash flood. Local standard time, as filed.
Up to 3 inches of rain fell in a short amount of time causing flash flooding in Clinton county. Numerous roads across the county had water over them.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2009Every state in 2009This day in weather historyWarnings in Illinois, 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: 188206.