A thunderstorm complex moved southeast through the region. A few of the storms produced severe weather.
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.
A thunderstorm complex moved southeast through the region. A few of the storms produced severe weather.
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 12, 6:13 AM CST, 5 hours 17 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE ST LOUIS MO 713 AM CDT SUN JUL 12 2009 .UPDATE... /709 AM CDT SUN JUL 12 2009 MADE A SLIGHT ADJUSTMENT TO THE FORECAST TO ACCOUNT FOR LATEST RADAR TRENDS. SPECIFICALLY...PRIMARY FOCUS FOR REST OF THIS MORNING AND INTO THE AFTERNOON WILL BE ON LINEAR MCS THAT IS APPROACHING KC AREA. THIS SYSTEM SHOULD BEGIN TURNING A BIT MORE SE AND ROLL THROUGH CENTRAL AND SE MO LT THIS MORNING AND THIS AFTERNOON. HAVE ADJUSTED FORECAST TO REFLECT THIS TIMING, AND HAVE ALSO UPPED POPS FROM CENTRAL INTO SE MO INTO LIKELY CATEGORY. ALSO MADE A CORRESPONDING...DOWNWARD...TEMP ADJUSTMENT IN THESE AREAS AS WELL. TRUETT && .DISCUSSION... /430 AM CDT SUN JUL 12 2009/ MAIN FORECAST PROBLEM THROUGH MIDWEEK CONTINUES TO BE PINNING DOWN TSRA CHANCES AS CWA REMAINS ON THE NE PERIPHERY OF UPR RDG. TODAY IT APPEARS THAT THERE WILL BE TWO DISTINCT CHANCES AT PRECIP. THE FIRST WILL BE ASSOCIATED WITH BROAD WAA THAT IS FORECAST FROM E KS TO S MO...AND BELIEVE THIS IS THE FEATURE AIDING PREDAWN DEVELOPMENT SEEN ON REGIONAL RADAR IMAGERY FROM NEAR EMP TO NR UNO. ONGOING PRECIP IS MOVING SE AND WOULD MISS MOST OF OUR CWA ALMOST ENTIRELY...BUT PROGS DO INDICATE WAA LIFTING A BIT NE THIS MORNING SO HAVE CONTINUED LO POPS OVER SW FRINGES OF OUR CWA. MEANWHILE...MORE INTENSE LINE OF STORMS NOW PROPAGATING THROUGH S NE AND N CNTRL KS APPEARS TO BE ASSOCIATED WITH SHORTWV THAT WILL IMPACT OUR AREA THIS AFTN. THIS SHOULD INCREASE TSRA CHANCES IN MOST AREAS ALONG AND W OF MISS RIVER...WITH HIGHEST POPS OVER SW PART OF FA WHERE INSTABILITY AND LIFT ASSOCIATED WITH Q-STATIONARY FRONTAL BOUNDAY WILL BE JUXTAPOSED. DETAILS GET MURKIER TONIGHT AND INTO TUESDAY...WITH MODELS SUGGESTING TWO POSSIBLE SCENARIOS. WRF...GFS...AND LOCAL WRF SUPPORT THE IDEA THAT W-E LO LVL JET WILL ONCE AGAIN RAMP UP ACROSS S MO TONIGHT FUELING ANOTHER MCS WITH ITS QPF AXIS SOMEWHERE OVER THE SW HALF OF THE CWA...WITH WRM ADV GENERATED TSRA LINGERING ACROSS S AREAS THROUGHOUT MON MRNG. MEANWHILE...NSSL WRF SUGGESTS A SLIGHTLY DIFFERENT EVOLUTION...WITH STORMS APPARENTLY RIDING A SHORTWAVE ACROSS IOWA THIS AFTERNOON AND INTO OUR AREA THIS EVENING. THIS SECOND SOLUTION ALSO SUGGESTS A FAIRLY SIGNIFICANT INCREASE IN TSRA COVERAGE LATER THIS EVENING IN S PORTIONS OF OUR CWA AS SHORTWAVE INTERACTS WITH LO LVL JET...WHICH ALSO SUPPORTS HIGHER POPS. HAVE CONTINUED TREND OF GOING POPS FOR MON WHICH LEAN TOWARD THE WRF...GFS...AND LOCAL WRF SOLUTIONS OF TSRA LINGERING IN WAA PATTERN OVER THE S. HOWEVER...THE NSSL WRF INDICATES STORMS WILL BE QUITE PROGRESSIVE...AND IF THIS SOLUTION VERIFIES GOING POPS COULD WELL BE TOO HIGH. SFC WARM FRONT FORECAST TO LIFT ACROSS AREA MONDAY NIGHT AND TUESDAY MORNING...AND ALTHOUGH THIS WILL GENERATE A BIT OF LIFT AND AIRMASS WILL REMAIN UNSTABLE DONT REALLY SEE MUCH IN THE WAY OF FOCUSED LIFT TO GET STORMS GOING. BY TUE AFTERNOON MOST OF CWA WILL BE DEEP INTO THE WARM AND HUMID AIRMASS GIVING AREA ANOTHER REAL TASTE OF SUMMER. FOCUS ON POPS DURING THIS TIME WILL PRIMARILY BE OVER N SECTIONS OF THE CWA...WHERE FRONTAL BOUNDARY...INSTABILITY...AND DYNAMICS WILL BE A BIT MORE IN PHASE. THIS TSRA THREAT SHOULD WORK SLOWLY S ONCE AGAIN ON WEDNESDAY AND WEDNESDAY NIGHT AS COLD FRONT PUSHES INTO VERY UNSTABLE AIRMASS...HOWEVER ATTM FORECAST SOUNDINGS INDICATE A FAIRLY SUBSTANTIAL CAP SO FOR THE TIME BEING HAVE HELD POPS IN LOW CHC CATEGORY. NO MAJOR CHANGES TO THE MEDIUM RANGE. TRUETT && .AVIATION... /455 AM CDT SUN JUL 12 2009/ FOR THE 12Z TAFS...PATCHY STRATUS CLOUDS IN THE COU AREA SHOULD SLOWLY DISSIPATE AND GRADUALLY RISE IN HGT THRU THE MRNG HRS BUT MAY HAVE A BRIEF PD OF A BKN CEILING FM 1000-2000 FT TIL 14Z SUN. OTHERWISE AT THE TAF SITES WILL HAVE SCT DIURNAL CUMULUS CLOUDS DVPG BY LT MRNG WITH PLENTY OF MID-HI LVL CONVECTIVE DEBRIS CLOUDS FM MCS CURRENTLY OVER NERN KS SERN NEBRASKA. AN MCV FM THIS FEATURE MOVG EWD INTO NWRN MO ALONG WITH LOW-MID LVL WAA OVER THE STNRY FNT ACRS SRN MO SHOULD GENERATE TSRA WHICH WILL MOVE INTO COU THIS AFTN. PLAN TO INCLUDE A TEMPO GRP OF TSRA IN COU THIS AFTN AND MAY INCLUDE A VCTS IN STL AND SUS. 4 KM WRF MDLS ALSO DEPICT ANOTHER AREA OF CONVECTION AHEAD OF A NW FLOW SHRTWV TROF DROPPING SEWD THRU THE CWA THIS EVNG. MAY INCLUDE VCTS IN THE TAFS THIS EVNG OR A PROB30 GRP OF TSRA. THIS TSRA ACTIVITY MAY SHIFT S OF COU...STL AND SUS BY LT TGT. E-NELY SFC WNDS SHOULD BCM MORE E-SELY BY THIS AFTN. GKS && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 611 AM CDT SUN JUL 12 2009 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-131115- 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- 611 AM CDT SUN JUL 12 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 THERE WILL BE A CHANCE OF THUNDERSTORMS TODAY AND TONIGHT...WITH THE GREATEST CONCENTRATION OF STORMS EXPECTED FROM CENTRAL INTO SOUTHEAST MISSOURI. STRONG WINDS...HAIL...AND HEAVY RAIN MAY OCCUR WITH THE STRONGER STORMS...ESPECIALLY OVER CENTRAL AND SOUTHEAST MISSOURI. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A CHANCE OF THUNDERSTORMS OVER SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS ON MONDAY. THERE IS ALSO A CHANCE OF THUNDERSTORMS OVER NORTHERN MISSOURI AND CENTRAL ILLINOIS ON TUESDAY...WITH THIS THREAT OF STORMS OVERSPREADING MOST OF THE REGION TUESDAY NIGHT AND WEDNESDAY. A FEW STORMS MAY LINGER OVER SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS WEDNESDAY NIGHT AND THURSDAY. HEAT INDEX VALUES WILL CLIMB TO NEAR 100 DEGREES OVER PARTS OF THE AREA ON BOTH TUESDAY AND WEDNESDAY AFTERNOONS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION COULD BECOME NECESSARY THIS AFTERNOON AND TONIGHT...ESPECIALLY OVER CENTRAL AND SOUTHEAST MISSOURI. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 TRUETT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1021 AM CDT SUN JUL 12 2009 MOZ026-034-041-042-047>050-121615- AUDRAIN MO-BOONE MO-CALLAWAY MO-COLE MO-MONITEAU MO-MONROE MO-OSAGE MO-SHELBY MO- 1021 AM CDT SUN JUL 12 2009 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SHELBY...WESTERN MONROE...WESTERN AUDRAIN...BOONE...WESTERN CALLAWAY...MONITEAU...COLE AND OSAGE COUNTIES UNTIL 1115 AM CDT... AT 1019 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES SOUTH OF MARCELINE TO 9 MILES WEST OF GLASGOW TO NEW FRANKLIN TO 7 MILES NORTHEAST OF BUNCETON TO 6 MILES NORTHWEST OF HIGH POINT TO IBERIA... AND MOVING EAST AT 35 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... CALIFORNIA... COLUMBIA... ASHLAND... JEFFERSON CITY... HOLTS SUMMIT... FULTON... LINN... CENTRALIA... HIGH POINT... ROCHEPORT... HICKORY HILL... JAMESTOWN... MCGIRK... RUSSELLVILLE... CENTERTOWN... EASLEY... MIDWAY... BRAZITO... ST. THOMAS... ST. MARTINS... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. SIPPRELL
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1107 AM CDT SUN JUL 12 2009 MOZ026-034-041-042-049>051-059-062-072-121700- AUDRAIN MO-BOONE MO-CALLAWAY MO-CRAWFORD MO-FRANKLIN MO-GASCONADE MO-MONROE MO-MONTGOMERY MO-OSAGE MO-SHELBY MO- 1107 AM CDT SUN JUL 12 2009 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SHELBY...MONROE... AUDRAIN...NORTHEASTERN BOONE...MONTGOMERY...CALLAWAY...GASCONADE... OSAGE...WESTERN FRANKLIN AND NORTHERN CRAWFORD COUNTIES UNTIL NOON CDT... AT 1106 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 11 MILES SOUTH OF BEVIER TO HIGBEE TO 6 MILES SOUTH OF MURRY TO NEW BLOOMFIELD TO LINN TO NEWBURG...AND MOVING EAST AT 25 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. WIND GUSTS OF UP TO 40 TO 45 MPH HAVE BEEN REPORTED IN COLUMBIA AND JEFFERSON CITY MISSOURI. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... LINN... FULTON... CENTRALIA... OWENSVILLE... CUBA... MEXICO... STEELVILLE... PARIS... HERMANN... SHELBINA... BOURBON... SANTA FE... MONTGOMERY CITY... MURRY... HALLSVILLE... STURGEON... CHAMOIS... BLAND... MOUNT STERLING... AUXVASSE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. SIPPREL
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1151 AM CDT SUN JUL 12 2009 MOZ051-052-059>062-072-073-121730- CRAWFORD MO-FRANKLIN MO-GASCONADE MO-LINCOLN MO-MONTGOMERY MO-ST. CHARLES MO-WARREN MO-WASHINGTON MO- 1151 AM CDT SUN JUL 12 2009 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LINCOLN...MONTGOMERY... WARREN...WESTERN ST. CHARLES...GASCONADE...FRANKLIN...CRAWFORD AND WASHINGTON COUNTIES UNTIL 1230 PM CDT... AT 1149 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES EAST OF MEXICO TO MINEOLA TO CHERRYVILLE...AND MOVING EAST AT 40 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...HERMANN... MONTGOMERY CITY...BOURBON...WELLSVILLE...SULLIVAN...NEW HAVEN... ANTHONIES MILL...WARRENTON...UNION...ST. CLAIR...WASHINGTON...WRIGHT CITY...POTOSI...VILLA RIDGE...TROY...GRAY SUMMIT...WENTZVILLE... PACIFIC...LEASBURG AND GERALD. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1201 PM CDT SUN JUL 12 2009 MOZ084-099-121730- IRON MO-REYNOLDS MO- 1201 PM CDT SUN JUL 12 2009 ...SIGNIFICANT WEATHER ADVISORY FOR IRON AND NORTHERN REYNOLDS COUNTIES UNTIL 1230 PM CDT... AT NOON CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR OATES...OR 25 MILES EAST OF SALEM...MOVING EAST AT 25 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...OATES...BELLEVIEW... GLOVER...CENTERVILLE...BLACK...LESTERVILLE...HOGAN...GRANITE AND CHLORIDE. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING.
The St Louis radar (KLSX), 32 km away, was scanning. The volume nearest the first event began at 17:28 UTC.
3 thunderstorm wind. Local standard time, as filed.
Several large tree limbs and a power line were blown down in town.
Thunderstorm winds blew down several 2 to 3 foot diameter trees near Six Flags. Also, a large tree was blown down blocking all west bound lanes of Interstate 44 near mile marker 262.
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: 188337, 188334, 188336.