A strong cold front moved through the region, triggering showers and thunderstorms. Some of the storms became severe producing large hail and damaging winds.
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 strong cold front moved through the region, triggering showers and thunderstorms. Some of the storms became severe producing large hail and damaging winds.
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 Apr 10, 6:05 PM CST, 2 hours 7 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 705 PM CDT SUN APR 10 2011 .DISCUSSION... /234 PM CDT SUN APR 10 2011/ MAIN CONCERN FOR THIS FORECAST DEALS WITH THE POTENTIAL FOR SEVERE WEATHER LATE THIS AFTERNOON AND TONIGHT. LATEST RUNS OF THE RUC/HRRR/WRF/GFS ARE PRETTY CONSISTENT IN DEVELOPING A NE-SW ORIENTED LINE OF STORMS FROM NERN OK INTO CNTRL MO AROUND 00Z. SHORTWAVE TROUGH CURRENTLY OVER THE TEXAS PANHANDLE WILL MOVE RAPIDLY NORTHEASTWARD INTO MISSOURI THIS EVENING IN THE TIGHT SOUTHWESTERLY FLOW ALOFT. THIS TROUGH WILL ACT TO ERODE THE STRONG CAP CURRENTLY OVER THE REGION BETWEEN 700-900MB. THERE IS ALREADY AND EXTENSIVE CU FIELD FROM CENTRAL OKLAHOMA INTO NORTHEASTERN MISSOURI AHEAD OF A DEEP PREFRONTAL CONVERGENCE ZONE THAT IS EXPECTED TO STRENGTHEN THROUGH THE EVENING. THE THUNDERSTORMS MAY INITIALLY BE ELEVATED BUT SHOULD EVENTUALLY BECOME SURFACE BASED AS CAP ERODES WITH MLCAPES BETWEEN 1000-1500 J/KG ALONG AND AHEAD OF THE CONVERGENCE ZONE. DEEP LAYER SHEAR BETWEEN 50-70KTS SUGGEST SUPERCELLS WILL BE LIKELY WHICH IS ALSO DEPICTED IN THE HRRR REFLECTIVITY/UPDRAFT HELICITY FIELDS. EVENTUALLY CONVECTION SHOULD BECOME LINEAR THROUGH THE EVENING GIVEN THAT SHEAR VECTORS ARE ALIGNED WITH UPPER FLOW...WITH THE LINE MOVING SLOWLY SEWD THROUGH THE LATE EVENING AND OVERNIGHT. THERE WILL BE A LARGE HAIL AND TORNADO THREAT WITH THE SUPERCELLS THIS EVENING WITH CONTINUED DAMAGING WIND THREAT OVERNIGHT. THERE WILL BE SOME POTENTIAL FOR HEAVY RAINFALL GIVEN PWATS AROUND 1.75 INCHES AND GOOD SETUP FOR TRAINING...BUT WILL ONLY MENTION THIS POTENTIAL IN THE HAZARDOUS WEATHER OUTLOOK GIVEN HIGH FLASH FLOOD GUIDANCE NUMBERS. FRONT WILL MOVE SOUTHEAST OF THE CWA BY 12Z MONDAY...THOUGH THINK THERE WILL BE SCATTERED SHOWERS AND CLOUD COVER DURING THE DAY AS THE UPPER TROUGH MOVES ACROSS THE AREA. EXPECT DRY WEATHER MONDAY NIGHT INTO WEDNESDAY AS LARGE SCALE SUBSIDENCE SETS IN BEHIND EXITING TROUGH. THERE IS CONSIDERABLE UNCERTAINTY LATE WEEK AND NEXT WEEKEND AS THE MEDIUM RANGE MODELS ARE NOW SHOWING A CLOSED LOW DEVELOPING OVER THE CENTRAL CONUS BY FRIDAY THAT WILL SLOWLY MIGRATE INTO THE OHIO VALLEY DURING THE WEEKEND. HAVE INCREASED RAIN CHANCES THURSDAY AND FRIDAY AND DROPPED TEMPERATURES IN ANTICIPATION OF THIS. BRITT && .AVIATION... /705 PM CDT SUN APR 10 2011/ STORMS HAVE BEGUN TO FIRE IN AN AREA FROM SOUTHWESTERN MO TO NORTHEASTERN MO...JUST AHEAD OF DRY LINE. EXPECT LINE TO INCREASE IN COVERAGE AND INTENSITY OVER THE NEXT SEVERAL HOURS AND SLIDE EAST ACROSS FORECAST AREA TONIGHT. IN THE MEANTIME...GUSTY SOUTH TO SOUTHWEST WINDS BEGINNING TO DIMINISH A BIT. HAVE STORMS MOVING THROUGH KUIN/KCOU THROUGH 04Z...THEN STORMS APPROACH KSUS/KSTL AFTER 02Z...WITH BEST CHANCES BETWEEN 04Z AND 07Z. SOME OF THE STORMS MAY BE SEVERE TONIGHT. MODELS CONTINUE TO SHOW SOME POST FRONTAL SHOWER ACTIVITY OVER KSUS/KSTL...SO KEPT MENTION OF SHOWERS THROUGH 10Z. AS FOR CIGS...EXPECT MVFR CIGS WITH STORMS...THEN SCATTER OUT AT KUIN AND KCOU...WHILE MVFR CIGS TO LINGER IN METRO AREA THROUGH MID MORNING ON MONDAY...BEFORE SCATTERING OUT. WITH FRONTAL PASSAGE... WILL SEE WINDS SWITCH TO THE WEST TO NORTHWEST. WINDS TO PICKUP A BIT ON MONDAY WITH GUSTS TO NEAR 25 KTS AT TIMES. SPECIFICS FOR KSTL...STORMS TO APPROACH KSTL AFTER 02Z...WITH BEST CHANCES BETWEEN 04Z AND 07Z. SOME OF THE STORMS MAY BE SEVERE TONIGHT. MODELS CONTINUE TO SHOW SOME POST FRONTAL SHOWER ACTIVITY OVER KSTL...SO KEPT MENTION OF SHOWERS THROUGH 10Z. AS FOR CIGS...EXPECT MVFR CIGS WITH STORMS...THEN LINGER OVER KSTL THROUGH MID MORNING ON MONDAY...BEFORE SCATTERING OUT. WITH FRONTAL PASSAGE... WILL SEE WINDS SWITCH TO THE WEST TO NORTHWEST. WINDS TO PICKUP A BIT ON MONDAY WITH GUSTS TO NEAR 25 KTS AT TIMES. BYRD && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 634 PM CDT SUN APR 10 2011 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-111200- 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- 634 PM CDT SUN APR 10 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT SEVERE THUNDERSTORMS ARE POSSIBLE TONIGHT ACROSS THE REGION. THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING ISOLATED TORNADOES... LARGE HAIL...DAMAGING WIND GUSTS IN EXCESS OF 60 MPH AND LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A CHANCE FOR THUNDERSTORMS THURSDAY THROUGH FRIDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS LIKELY THROUGH TONIGHT. BRITT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
841 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0840 PM HAIL HANNIBAL 39.71N 91.38W
04/10/2011 E0.88 INCH MARION MO TRAINED SPOTTER
HAIL OBSERVED ON THE SOUTH SIDE OF HANNIBAL
&&
JPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
842 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0840 PM TSTM WND GST HANNIBAL 39.71N 91.38W
04/10/2011 E40 MPH MARION MO TRAINED SPOTTER
NO HAIL IN DOWNTOWN HANNIBAL...HEAVY RAINFALL ESTIMATED
WIND GUST TO 40 MPH
&&
PRZYBYLINSKIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
855 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0853 PM HAIL 4 SSW COLUMBIA 38.90N 92.36W
04/10/2011 E1.00 INCH BOONE MO TRAINED SPOTTER
WIND SPEED ESTIMATED 30 MPH
&&
PRZYBYLINSKIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
902 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 PM HAIL 1 SW COLUMBIA 38.94N 92.34W
04/10/2011 E0.88 INCH BOONE MO TRAINED SPOTTER
ESTIMATED WIND SPEED 30 MPH
&&
PRZYBYLINSKIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
905 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0901 PM HAIL COLUMBIA 38.95N 92.33W
04/10/2011 E0.25 INCH BOONE MO TRAINED SPOTTER
HAIL LASTED ABOUT ONE MINUTE
&&
JPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
911 PM CDT SUN APR 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0910 PM TSTM WND GST NEW LONDON 39.58N 91.40W
04/10/2011 E40 MPH RALLS MO TRAINED SPOTTER
WIND GUSTS ESTIMATED BETWEEN 30 AND 40 MPH.
&&
BYRDThe Lincoln radar (KILX), 119 km away, was scanning. The volume nearest the first event began at 02:11 UTC.
2 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew part of the roof off of a house. No injuries were reported.
Thunderstorm winds blew down a two foot diameter tree limb as well as numerous smaller limbs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2011Every state in 2011This day in weather historyWarnings in Illinois, April 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: 302995, 303005.