Storms formed south of a warm front and moved north, interacting with the frontal boundary. Some of the storms produced brief tornado touch downs, while others produced very heavy rainfall.
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.
Storms formed south of a warm front and moved north, interacting with the frontal boundary. Some of the storms produced brief tornado touch downs, while others produced very heavy rainfall.
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 23, 5:17 PM CST, 23 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED AVIATION NATIONAL WEATHER SERVICE ST LOUIS MO 617 PM CDT FRI APR 23 2010 .DISCUSSION... /352 PM CDT FRI APR 23 2010/ ACTIVITY THAT DEVELOPED ALONG WARM FRONT HAS LIFTED NORTHWARD AWAY FROM REGION. NOW KEEPING EYE ON WARM SECTOR AS SPC MESOANALYSIS SHOWS INCREASING MUCAPES...SURFACE DEWPOINTS...AS WELL AS SURFACE BASED CAPES AND DECENT WIND SHEAR IN THE LOWER 6KM. SO MAIN FORECAST ISSUES IN THE SHORT TERM WILL BE CHANCES OF SEVERE WEATHER THIS EVENING AND AGAIN ON SATURDAY DUE TO SEVERAL WAVES ASSOCIATED WITH THE WEATHER SYSTEM CENTERED OVER EASTERN CO THIS AFTERNOON. FOR TONIGHT...WARM FRONT EXTENDING FROM SURFACE LOW OVER EASTERN CO THROUGH NORTHERN KANSAS THEN INTO MO FROM KMCI TO JUST SOUTH OF KSTL AS OF 20Z...WILL TAKE ITS TIME LIFTING NORTHWARD OUT OF AREA. SO WITH SLOW MOVEMENT...WILL SEE STORMS CONTINUE TO DEVELOP SOUTH OF BOUNDARY IN WARM SECTOR...THEN DRIFT NORTHWARD TOWARDS FRONT BECOMING MORE SURFACE BASED WITH LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES POSSIBLE WITH SOME OF THE STORMS. STORMS TO TAPER OFF AFTER 06Z. ON SATURDAY...BETTER CHANCES OF SEVERE WEATHER AS STRONG UPPER LEVEL LOW FINALLY ROTATES AROUND THE BASE OF THE TROF STRENGTHENING SURFACE LOW ALONG COLD FRONTAL BOUNDARY. THE SURFACE LOW WILL LIFT NORTHEASTWARD THROUGH SOUTHEAST MO/SOUTHERN IL DURING THE DAY ON SATURDAY WITH DECENT DEEP LAYER SHEAR...HELICITY VALUES AND CAPES. DAMAGING WINDS...LARGE HAIL AND ISOLATED TORNADOES WILL BE THE PRIMARY THREATS MAINLY ALONG AND SOUTH OF INTERSTATE 70...THOUGH ISOLATED SEVERE WEATHER NOT OUT OF THE QUESTION FURTHER NORTH DUE TO THE COLD CORE UPPER LEVEL LOW...STEEP MIDLEVEL LAPSE RATES AND MODERATE TO STRONG DEEP LAYER SHEAR. THE MAIN THREATS IN THIS AREA WOULD BE DAMAGING WINDS AND ISOLATED TORNADOES. SHOWERS AND THUNDERSTORMS TO TAPER OFF SATURDAY NIGHT AS MAIN SYSTEM EXITS REGION. HOWEVER...WILL SEE SEVERAL SHORTWAVES SLIDE THROUGH AREA ON THE BACKSIDE OF THIS SYSTEM...WITH SHOWERS POSSIBLE THROUGH SUNDAY NIGHT. COULD SEE ADDITIONAL SHOWERS MONDAY AND MONDAY NIGHT...BUT CONFIDENCE IS LOW AT THIS TIME...SO HAVE SILENT SLIGHT CHANCE POPS DURING THIS PERIOD. BEYOND THAT...DRY AND COOLER WEATHER IN STORE FOR THE REGION TUESDAY THROUGH THURSDAY. EXTENDED MODELS ARE HINTING AT ANOTHER ROUND OF ACTIVITY FOR THURSDAY NIGHT AND FRIDAY...SO ADDED MENTION DURING THIS PERIOD. BYRD && .AVIATION... /612 PM CDT FRI APR 23 2010/ AREA OF SHRA/SCT TSRA OVER CNTRL AND ERN MO WILL CONTINUE TO MOVE NNEWD AFFECTING KUIN/KCOU THROUGH 03Z AND HAVE INCLUDED TEMPO FOR SHRA WITH VCTS TO ACCOUNT FOR THIS. A FEW OF THESE STORMS MAY PRODUCE HAIL AND WIND GUSTS TO 40KTS AND VSBYS MAY FALL TO 1SM IN HEAVY RAIN. UNDER FURTHER EAST...KSTL/KSUS IS ON THE ERN FRINGE OF THIS AREA...SO JUST HAVE VCTS. AREA OF TSRA OVER FAR SERN MO/WRN AR WILL MOVE UP NWD AFFECTING KSTL LATER THIS EVENING AND OVERNIGHT. EXPECT MVFR CIGS AND VSBYS THROUGH MID MORNING WITH A REPRIEVE FROM THE RAIN BEFORE A COLD FRONT MOVES FROM WEST TO EAST BRINGING ADDITIONAL TSRA TO THE AREA. SPECIFICS FOR KSTL...EXPECT SCT TSRA EARLY THIS EVENING WITH A BETTER CHANCE OF RAIN AFFECTING THE AREA AFT 03Z. MVFR CIGS ARE LIKELY OVERNIGHT INTO MID MORNING SATURDAY. ADDITIONAL TSRA ARE EXPECTED ON SATURDAY AFTERNOON AS A COLD FRONT MOVES ACROSS ERN MO. BRITT && .LSX WATCHES/WARNINGS/ADVISORIES... MO...NONE. IL...NONE. && WFO LSX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 354 PM CDT FRI APR 23 2010 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-241200- 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- 354 PM CDT FRI APR 23 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THUNDERSTORMS ARE LIKELY THROUGH TONIGHT AS A FEW ROUNDS MOVE THROUGH THE AREA. THERE IS A SLIGHT RISK FOR SEVERE STORMS... ESPECIALLY FOR THIS EVENING...WHERE A FEW STORMS MAY PRODUCE LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES. FOR FURTHER INFORMATION ON CONVECTIVE WATCHES...PLEASE REFER TO THE LATEST STORM PREDICTION CENTER WATCH PRODUCTS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS REMAIN LIKELY ON SATURDAY. THERE IS A SLIGHT RISK FOR SEVERE STORMS...WHERE A FEW STORMS MAY PRODUCE LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES. THERE IS ANOTHER CHANCE FOR THUNDERSTORMS ON THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE...ESPECIALLY THIS EVENING. && FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1 BYRD
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 548 PM CDT FRI APR 23 2010 MOZ050-051-232330- CALLAWAY MO-MONTGOMERY MO- 548 PM CDT FRI APR 23 2010 ...SIGNIFICANT WEATHER ADVISORY FOR MONTGOMERY AND NORTHEASTERN CALLAWAY COUNTIES UNTIL 630 PM CDT... AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES SOUTH OF WILLIAMSBURG...OR 14 MILES EAST OF FULTON...MOVING NORTH AT 30 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MONTGOMERY CITY... WELLSVILLE... MINEOLA... WILLIAMSBURG... SHAMROCK... DANVILLE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. KANOFSKY
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 602 PM CDT FRI APR 23 2010 MOZ051-060-232330- MONTGOMERY MO-WARREN MO- 602 PM CDT FRI APR 23 2010 ...SIGNIFICANT WEATHER ADVISORY FOR MONTGOMERY AND NORTHWESTERN WARREN COUNTIES UNTIL 630 PM CDT... AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR BIG SPRING...OR 9 MILES NORTH OF HERMANN... MOVING NORTHEAST AT 20 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... JONESBURG... HIGH HILL... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. KANOFSKY
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 606 PM CDT FRI APR 23 2010 MOZ034-041-042-232330- AUDRAIN MO-BOONE MO-MONROE MO- 606 PM CDT FRI APR 23 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MONROE... NORTHWESTERN AUDRAIN AND NORTHWESTERN BOONE COUNTIES UNTIL 630 PM CDT... AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES SOUTHWEST OF STURGEON...OR 14 MILES EAST OF FAYETTE...MOVING NORTHEAST AT 35 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... STURGEON... MADISON... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. KANOFSKY
The St Louis radar (KLSX), 49 km away, was scanning. The volume nearest the first event began at 23:39 UTC.
5 tornado, 2 flash flood. Local standard time, as filed.
A tornado briefly touched down in a field. No damage was reported.
A tornado briefly touched down in a field. No damage was reported.
A tornado briefly touched down in a field. No damage was reported.
A tornado briefly touched down in a field. No damage was reported.
Between 2 and 4 inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded including U.S. Highway 50 just west of California and Highway O just north of California. One foot of water was flowing over Parkview Drive in California.
A tornado briefly touched down in a field. No damage was reported.
Between 2 and 4 inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded in Columbia.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2010Every state in 2010This day in weather historyThe tornado archive for Missouri, 2010Warnings in Missouri, April 2010
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: 225024, 225025, 225026, 225027, 225028, 225029, 225030.