Isolated storms developed over northeast Missouri and west central Illinois. There were some reports of wind damage with these storms.
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.
Isolated storms developed over northeast Missouri and west central Illinois. There were some reports of wind damage with these storms.
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 Jun 19, 11:00 PM CST, 3 hours 45 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 1200 AM CDT MON JUN 20 2011 .UPDATE... /927 PM CDT SUN JUN 19 2011/ HAVE A LOWERED THUNDERSTORM CHANCES OVER MUCH OF THE REGION THE REST OF THE EVENING AS A STRONG CAP AND SHORTWAVE RIDGING HAS LIMITED ANY RECENT DEVELOPMENT. THUNDERSTORMS ARE DEVELOPING RAPIDLY OVER FAR NORTHWEST MISSOURI AND SOUTHEAST IOWA IN AN AREA OF STRONG MOISTURE CONVERGENCE ON NOSE OF A STRENGTHENING LOW LEVEL JET. THESE STORMS WILL LIKELY EXPAND IN AREAL COVERAGE AND ORGANIZE INTO A FORWARD PROPAGATING MCS AS THE LOW LEVEL JET AND ASCENT INCREASES IN ADVANCE OF WEAK SHORTWAVE CURRENTLY OVER EASTERN KANSAS. PROPAGATION VECTORS FAVOR MOVEMENT ALONG THE MO/IA BORDER AND THE NORTHERN PART OF THE CWA MAY STILL BE AFFECTED AFTER MIDNIGHT. THESE STORMS WILL BE CAPABLE OF PRODUCING SOME LARGE HAIL AND DAMAGING WIND GUSTS OWING TO THE EXTREME INSTABILITY AND DEEP LAYER SHEAR VECTORS OF 40 KNOTS. OTHERWISE...GOING FORECAST LOOKS GOOD. BRITT && .DISCUSSION... /355 PM CDT SUN JUN 19 2011/ OLD OUTFLOW BOUNDARY FROM LAST NIGHTS MCS HAS SETTLED OVER SERN MO TO WCNTRL MO AND THRU NRN KS...MORE SPECIFICALLY FROM JUST S OF KPAH-JUST S OF KCGI-JUST S OF KAIZ AND EXTENDS TO JUST S OF THE KC METRO AREA. THIS OUTFLOW BOUNDARY IS BECOMING INCREASINGLY CAPPED TO SFC BASED CONVECTION...BUT MAY BE ABLE TO STILL POP AN ISOLD TSRA EARLY THIS EVENING. WHAT SHOULD BE ABLE TO GET GOING A FEW MORE SHRA/TSRA THIS EVENING WILL BE A BAND OF H700 MOISTURE CONVERGENCE WHICH WILL CIRCUMVENT THE STRENGTHENING CAP BELOW...AND WE ARE ALREADY SEEING THIS DEVELOP SOME SHRA/TSRA IN SWRN IL AND INTO STL CITY. THIS AREA OF H700 MOISTURE CONVERGENCE WILL PUSH NE OF THE FA BY LATE EVENING AND THIS SHOULD GIVE US A BRIEF PERIOD OF QUIET WX. SEVERE POTENTIAL THRU THIS EVENING APPEARS MUCH LIKE THE RAIN CHCS...RATHER ISOLATED. HOWEVER...YET ANOTHER MCS SHOULD DEVELOP OVER IN NERN KS OR SWRN NEBRASKA THIS EVENING AND IS EXPECTED TO TRACK EWD NEAR THE MO-IA BORDER OVERNIGHT AND INTO MONDAY MORNING. NERN MO AND WCNTRL IL SHOULD BE ON THE SRN EDGE OF THIS MCS...BUT IF IT TAKES A MORE SWD TURN AND HITS THIS AREA WITH RAINFALL HARDER THAN CURRENTLY EXPECTED...THIS COULD RESULT IN SOME FLOODING OF CREEKS AND STREAMS AS FFG VALUES ARE RATHER LO IN SPOTS. THIS MAY ALSO GIVE THE NRN FA A BOUT OF SEVERE WX AS WELL. THE EFFECTIVE WRMFNT (THE OUTFLOW BOUNDARY) WILL MERGE WITH THE SYNOPTIC WRMFNT...ALREADY TO OUR N...BY MIDDAY MONDAY LIKELY THRU DISSIPATION OF THE FORMER. THIS SHOULD CAP THE ATMOSPHERE AREAWIDE THRU MONDAY AFTERNOON AND EVENING...BUT ALSO RESULT IN HOT AND HUMID AIR ABLE TO BUILD IN AS WELL. HEAT INDEX VALUES MAY TOUCH 100F IN STL CITY BRIEFLY. RAIN CHCS RETURN TO THE AREA HEADING INTO LATE MONDAY NIGHT AND WILL CONTINUE INTO TUESDAY NIGHT AS CDFNT SLOWLY PUSHES THRU IN RESPONSE TO DEEPENING UPPER LEVEL SYSTEM IN THE UPPER MIDWEST. MAINTAINED RATHER HI POPS DURING THIS PERIOD...ESPECIALLY TUESDAY DAYTIME AND EVENING. FOR THE EXTENDED PERIOD (WEDNESDAY NIGHT - SUNDAY)...MODELS STILL FORECASTING AN UPPER LO OVER THE UPR MS VALLEY AND ITS ASSOCIATED TROF EXTENDING TO THE S AT THE BEGINNING OF THE PERIOD...BUT THE GFS IS GOING A BIT DEEPER/STRONGER WITH THIS SYSTEM THAN THE ECMWF AND OTHERS...AND THE MAIN EFFECT OF THIS DIFFERENCE WILL BE TO TEND TO SLOW DOWN THE EWD TRANSLATION OF THE SYSTEM HEADING INTO LATE WEEK AND NEXT WEEKEND. AT THE SFC...CDFNT WILL EXIT THE SERN FA EARLY IN THE PERIOD WITH A WEAK RIDGE BUILDING OVERHEAD FOR FRIDAY. BUT ALREADY HEADING INTO FRIDAY NIGHT...A WRMFNT WILL MOVE INTO SRN MO AND SRN IL AND THEN SLOWLY WORK ITS WAY NEWD OVER THE COURSE OF THE NEXT COUPLE OF DAYS...NOT UNLIKE WHAT THE WRMFNT HAS DONE VERY RECENTLY HERE. THE SLOW NEWD PROGRESS WILL BE DUE TO WHAT SHOULD BE FAVORABLE MCS SETUPS FOR FRIDAY NIGHT AND SATURDAY NIGHT AND WHAT CONTINUES INTO THE DAYS ON SATURDAY AND SUNDAY. TRACK WILL BE HARD TO PIN DOWN THIS FAR OUT...SO PLACED LO CHC POPS IN FOR ALL LOCATIONS FOR NOW. TEMPS WILL BEGIN THE PERIOD BELOW AVERAGE BUT ARE EXPECTED TO RECOVER TO AVERAGE BY SUNDAY. IF THE MODELS SHOW A MORE ASSERTIVE H500 RIDGE...SHOULD EASILY SEE A RETURN TO THE 90S...BUT THEY HAVE BEEN VERY HESITANT THE PAST FEW DAYS AND OUR WET PATTERN SHOWS NO SIGN OF ABATEMENT. TES && .AVIATION... /1146 PM CDT SUN JUN 19 2011/ LATEST SURFACE ANALYSIS SHOWS THE OLD SURFACE BOUNDARY MOVING NORTHWARD FROM MCI AREA TO JUST SOUTH OF COU AND STL. APPEARS A NEW SURFACE WARM FRONTAL BOUNDARY IS BEGINNING TO FORM ACROSS NORTH CENTRAL MISSOURI. CURRENT STRONG THUNDERSTORM ACTIVITY SHOULD REMAIN MAINLY OVER SOUTHERN PART OF IOWA THROUGH EXTREME NORTHERN MISSOURI AND INTO NORTHWEST ILLINOIS. UPSTAIR VERY WEAK DISTURBANCE IS GENERATING ISOLATED SHOWERS FROM NEAR UIN THROUGH COU AND SW EAST OF SGF. BELIEVE THIS VERY LIGHT SHOWERS WILL REMAIN VERY LIGHT THROUGH EARLY MONDAY MORNING. MONDAY WILL BE HOT AND HUMID DAY WITH SOUTHERLY FLOW OF 15 KTS AT MOST TAF SITES. SPECIFICS FOR KSTL...MID TO HIGH LEVEL CLOUDS WILL CONTINUE TO MOVE OVER AREA THROUGH 0900 UTC. BELIEVE THAT THUNDERSTORM ACTIVITY WILL REMAIN NORTH OF STL. NO VISIBILITY RESTRICTIONS. SURFACE WINDS WILL REMAIN SOUTH SOUTHEAST AT 6 TO 8 KTS THROUGH DAYBREAK AND THEN SOUTH ON MONDAY AT 10 TO 15KTS. NO THUNDERSTORM ACTIVITY EXPECTED DURING THE DAY ON MONDAY. PRZYBYLINSKI && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1053 PM CDT SUN JUN 19 2011 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-201115- 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 MO- LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO- AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO- LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO- WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO- MADISON MO-REYNOLDS MO- 1053 PM CDT SUN JUN 19 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT A COMPLEX OF THUNDERSTORMS IS EXPECTED TO MOVE EAST ALONG THE IOWA AND MISSOURI BORDER AFFECT NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS LATE TONIGHT. ORGANIZED SEVERE WEATHER IS POSSIBLE WITH THIS...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS ONCE AGAIN. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE. THE ILLINOIS RIVER AT HARDIN IS IN MAJOR FLOOD. PLEASE REFER TO THE APPROPRIATE FLOOD STATEMENT FOR THE LATEST INFORMATION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE THUNDERSTORM COMPLEX WILL EXIT BY LATE MONDAY MORNING...AGAIN MAINLY EXPECTED OVER PORTIONS OF NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS. ADDITIONAL CHANCES FOR THUNDERSTORMS ARE EXPECTED LATE MONDAY NIGHT THROUGH TUESDAY NIGHT. SOME SEVERE STORMS ARE POSSIBLE ON TUESDAY AFTERNOON AND EVENING. THE CHANCE FOR THUNDERSTORMS RETURNS ON FRIDAY NIGHT AND SATURDAY. THE ILLINOIS RIVER AT HARDIN WILL CONTINUE TO BE IN MAJOR FLOOD THROUGH MID WEEK. PLEASE REFER TO THE APPROPRIATE FLOOD STATEMENT FOR THE LATEST INFORMATION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THROUGH TONIGHT. BRITT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 154 AM CDT MON JUN 20 2011 ILZ095>097-MOZ018-019-026-027-034>036-200900- ADAMS IL-BROWN IL-PIKE IL-KNOX MO-LEWIS MO-SHELBY MO-MARION MO- MONROE MO-RALLS MO-PIKE MO- INCLUDING THE CITIES OF...QUINCY...HANNIBAL...BOWLING GREEN 154 AM CDT MON JUN 20 2011 ...STRONG THUNDERSTORMS POSSIBLE OVER NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS DURING THE PREDAWN HOURS... THUNDERSTORMS WITH STRONG WINDS...HAIL...AND HEAVY RAIN MAY THREATEN NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS EARLY THIS MORNING...BETWEEN 230 AM AND 430 AM. THIS THREAT WILL INCLUDE THE EDINA...CANTON...LA GRANGE...HANNIBAL...PALMYRA...QUINCY...AND MOUNT STERLING. TRUETT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 207 AM CDT MON JUN 20 2011 MOZ018-019-200815- KNOX MO-LEWIS MO- 207 AM CDT MON JUN 20 2011 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LEWIS AND KNOX COUNTIES UNTIL 315 AM CDT... AT 204 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 18 MILES NORTH OF SOUTH GORIN TO NOVINGER...AND MOVING EAST AT 40 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... EDINA... GREENSBURG... COLONY... KNOX CITY... LA BELLE... LEWISTOWN... HURDLAND... BARING... NEWARK... THESE STORMS 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. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. TRUETT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 326 AM CDT MON JUN 20 2011 ILZ095-096-MOZ019-200930- ADAMS IL-BROWN IL-LEWIS MO- 326 AM CDT MON JUN 20 2011 ...SIGNIFICANT WEATHER ADVISORY FOR LEWIS...NORTHERN BROWN AND ADAMS COUNTIES UNTIL 430 AM CDT... AT 322 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 11 MILES NORTHWEST OF COLMAR TO LA BELLE...AND MOVING EAST AT 45 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... CANTON... QUINCY... EWING... LA GRANGE... MENDON... GOLDEN... CAMP POINT... MOUNT STERLING... MONTICELLO... LIMA... LORAINE... THESE STORMS 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. TRUETT
The St Louis radar (KLSX), 170 km away, was scanning. The volume nearest the first event began at 08:45 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew down several large tree limbs around town. Also, a ham radio tower was bent over by the winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2011Every state in 2011This day in weather historyWarnings in Missouri, June 2011
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: 332526.