A strong low pressure system moved from Oklahoma to near Chicago April 24th and 25th, while a warm front stretched across areas south of the Interstate 80 corridor. Heavy rain-producing showers and thunderstorms were common across this area, where rainfall totals of 1 to 4 inches were common.
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 DVN wrote it up.
A strong low pressure system moved from Oklahoma to near Chicago April 24th and 25th, while a warm front stretched across areas south of the Interstate 80 corridor. Heavy rain-producing showers and thunderstorms were common across this area, where rainfall totals of 1 to 4 inches were common. The torrential rains lead to some flash flooding in Galva, IL during the evening hours of April 24th.
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 Quad Cities, IA wrote its last area forecast discussion before the first event at Apr 24, 2:30 PM CST, 3 hours 47 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 330 PM CDT SAT APR 24 2010 .SYNOPSIS... LOW PRESSURE CONTINUES TO EVOLVE OVER SRN MO EARLY THIS AFTERNOON AS POTENT S/W MOVES NE AHEAD OF SRN PLAINS UPPER LOW. EASTERLY LOW LEVEL FLOW IS IN PLACE OVER THE CWFA THIS AFTERNOON KEEPING LOW CLOUDS AND AREAS OF BR/HZ IN PLACE THROUGH EARLY AFTERNOON. DIFFLUENT UPPER FLOW AHEAD OF THE SRN PLAINS UPPER LOW HAS SUPPORTED SOME ISOLD-SCT -SHRA/-TSRA OVER THE AREA SO FAR TODAY WITH MORE WIDE SPREAD SHRA/TSRA LIFTING N THROUGH CENTRAL/NRN MO. && .SHORT TERM...TONIGHT AND SUNDAY... MODELS ARE CONSISTENT WITH DEEPENING SE MO SFC LOW LIFTING N INTO NE MO/WCNTRL IL BY EARLY THIS EVENING THEN TURNING EAST AND MVNG INTO ECNTRL IL/WCNTRL IN BY MIDDAY SUNDAY. THIS TRAJECTORY WILL BRING EXPANDING AREA OF SHRA/TSRA THROUGH THE CWFA LATE THIS AFTERNOON AND TONIGHT WITH LINGERING -RA OVER MUCH OF THE AREA IN STRONG CYCLONIC FLOW SUNDAY. THE SEVERE THREAT IS EXPECTED TO BE LOW AS THE STRONGEST FORCING SPREADS N THROUGH CWFA LATE THIS AFTERNOON AND THIS EVENING. BELIEVE ATMOSPHERE WILL SATURATE QUICKLY LIMITING THE CHANCE FOR ANY SIGNIFICANT HAIL. THE BIGGEST CONCERN MAY BE DAMAGING WINDS EARLY THIS EVENING AS LOW LEVEL EASTERLY FLOW STRENGTHENS AHEAD OF THE DEEPENING SURFACE LOW. ANY STRONG TSRA WILL HAVE THE POTENTIAL TO MIX DOWN STRONGER WINDS JUST OFF THE SURFACE. THE WIND THREAT THOUGH WOULD BE LIMITED TO THE FAR SRN CWFA. HEAVY RAIN POTENTIAL/FLOODING IS ALSO A CONCERN ESPECIALLY IN WEST CENTRAL IL ALONG AND SOUTH OF HIGHWAY 34 SO WILL ISSUE A FLASH FLOOD WATCH FOR THIS EVENING. RECENT RAINS IN THIS AREA HAVE MOISTENED THE GROUND AND FFG VALUES ARE IN THE 1 TO 2 INCH RANGE. HEAVIEST QPF TO OCCUR THIS EVENING OVER THE FAR SRN CWFA AND SHOULD APPROACH THE FFG. ALSO EXPECT WINDY CONDITIONS TONIGHT INTO SUNDAY JUST NORTH AND WEST OF THE SURFACE LOW. POTENTIAL EXISTS TO REACH ADVISORY CRITERIA IN THE SOUTH. SINCE THE STRONGEST GRADIENT WILL BE OVER THE AREA AT NIGHT WILL TAKE WINDS UP TO JUST UNDER ADVISORY CRITERIA AND MONITOR. SUNDAY EXPECTED TO BE A BLUSTERY/RAINY DAY OVER THE AREA AS THE SURFACE LOW PULLS AWAY FROM THE REGION. TEMPS ARE NOT EXPECTED TO RECOVER MUCH AND ONLY ALLOW FOR ABOUT A 5 DEGREE RISE. ..DLF... .LONG TERM...SUNDAY NIGHT THROUGH NEXT SATURDAY... FIRST HALF OF THE WEEK...THE AREA WILL BE IN A WEAK NW FLOW ALOFT WITH EMBEDDED SHORTWAVES TO KEEP SEASONABLY COOL AND UNSETTLED WEATHER IN PLACE. LATE WEEK INTO THE WEEKEND...DEVELOPING UPPER LOW OVER THE NORTHERN ROCKIES/HIGH PLAINS INDUCES RETURN FLOW WITH WARMING TEMPERATURES AND RETURNING RAIN CHANCES. SUNDAY NIGHT THROUGH WED...WRAP AROUND MOISTURE AND LINGERING PRESSURE GRADIENT BEHIND DEPARTING STRONG CYCLONE OVER OHIO WILL KEEP SCATTERED SHOWERS AND BRISK WINDS THROUGH SUNDAY EVENING...THEN HAVE TRENDED DOWN RAIN CHANCES FROM NW TO SE AFTER MIDNIGHT AS THE FILLING SURFACE LOW CONTINUES EAST. MID LEVEL SHORTWAVE CURRENTLY MOVING INTO THE PACIFIC NW IS DEPICTED PASSING OVER OR SW OF THE FORECAST AREA MONDAY AFTERNOON AND EVENING. WITH LOW TO MID LEVEL MOISTURE LACKING...HAVE KEPT POPS ONLY IN SLIGHT CHANCE RANGE THROUGH MON NIGHT AND EARLY TUE. SURFACE AND UPPER LEVEL RIDGE THEN MIGRATES EAST THROUGH THE AREA TUE AFTERNOON INTO WED...PROVIDING DRY WEATHER AND ALLOWING MINS WED MORNING TO DROP INTO THE UPPER 30S ACROSS THE NORTH. FOR NOW HAVE A RANGE FROM AROUND 37 NORTH TO LOWER 40S SOUTH...BUT WILL NEED TO WATCH THIS SETUP IN LATER FORECASTS... FOR POSSIBILITY OF COLDER MINS AND FROST ACROSS ESPECIALLY THE NORTH. OTHERWISE...KEPT TEMPERATURES CLOSE TO SEASONAL NORMS MON THROUGH WED. WED NIGHT THROUGH FRI...LOW LEVEL JET AND MOISTURE RETURN FLOW DEVELOPS WED NIGHT AND HAVE SLIGHT CHANCES FOR POSSIBLE ELEVATED THUNDERSTORMS ON NOSE OF THE JET ACROSS THE NORTH. THUNDERSTORM CHANCES THEN INCREASE THU INTO FRI AS GULF MOISTURE THETA E RIDGE AXIS SETS UP OVER THE REGION. HOWEVER...OVERALL CONFIDENCE IN THE TIMING AND PLACEMENT OF SYNOPTIC FEATURES AND PERIODS OF BETTER FORCING IS LOW DUE TO POOR AGREEMENT AMONG THE ECMWF...GFS AND UKMET HANDLING OF THE UPPER SHORTWAVES. WILL THUS CONTINUE BROAD-BRUSH APPROACH...WITH HIGHEST POPS CENTERED ON THU NIGHT AND FRI. TEMPERATURES RETURN TO ABOVE NORMAL WITH HIGHS IN THE 70S AND LOWS IN THE 50S. ..SHEETS.. && .AVIATION... VFR TO ISOLD IFR CONDITIONS WILL EVOLVE TO WIDESPREAD IFR THIS EVENING AS LARGE AREA OF SHRA AND ISOLD-SCT TSRA SPREAD N OVER THE AREA. THE MAIN TSRA THREAT WILL BE AT KMLI/KBRL THROUGH THE EVENING THEN PCPN SHOULD BE MAINLY RA/SHRA. STRONG EAST WIND WILL DEVELOP OVER THE AREA BY EARLY EVENING AND THEN TURN TO THE N-NNW OVERNIGHT. GUSTS IN EXCESS OF 30 MPH ARE EXPECTED AT KMLI/KBRL. ..DLF.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...FLASH FLOOD WATCH THROUGH SUNDAY MORNING FOR LEE-VAN BUREN. IL...FLASH FLOOD WATCH THROUGH SUNDAY MORNING FOR HANCOCK-MCDONOUGH. MO...FLASH FLOOD WATCH THROUGH SUNDAY MORNING FOR CLARK-SCOTLAND. && DLF/SHEETS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 408 PM CDT SAT APR 24 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-252115- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON- CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON- HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL- WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON- WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- 408 PM CDT SAT APR 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST MISSOURI. .DAY ONE...THIS AFTERNOON AND TONIGHT AN INTENSE SPRING STORM SYSTEM WILL PRODUCE WIDESPREAD SHOWERS AND THUNDERSTORMS ACROSS THE OUTLOOK AREA TONIGHT INTO SUNDAY. HEAVY RAINFALL WILL BE POSSIBLE...ESPECIALLY SOUTH OF INTERSTATE 80...WHERE RAINFALL TOTALS AS HIGH AS 1 TO 2 INCHES ARE LIKELY BY LATE SUNDAY. A FLASH FLOOD WATCH HAS BEEN ISSUED TONIGHT THROUGH SUNDAY MORNING FOR ALL OF NORTHEAST MISSOURI...AND SOUTH OF HIGHWAY 34 IN SOUTHEAST IOWA AND WEST CENTRAL ILLINOIS. PLEASE SEE THE LATEST FLOOD WATCH STATEMENT FOR THE LATEST INFORMATION. THERE IS A POTENTIAL FOR ISOLATED SEVERE STORMS LATE THIS AFTERNOON AND EVENING. THESE ARE MOST LIKELY ACROSS EAST CENTRAL IOWA...FAR NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS...WHERE THE STORM PREDICTION CENTER HAS PLACED A SLIGHT RISK. THE PRIMARY SEVERE WEATHER THREAT WILL BE HAIL UP TO 1 INCH IN DIAMETER AND WIND GUSTS UP TO 60 MPH. STRONG SURFACE WINDS WILL DEVELOP TONIGHT INTO SUNDAY AS AN INTENSE LOW PRESSURE SYSTEM PASSES TO THE SOUTH. NORTH TO NORTHEAST WINDS WILL INCREASE TO 20 TO 30 MPH...WITH GUSTS OVER 40 MPH LATE TONIGHT. WINDS THIS STRONG MAY RESULT IN DIFFICULT DRIVING CONDITIONS FOR HIGH PROFILE VEHICLES...AND MAY ALSO BLOW AROUND UNSECURED OBJECTS SUCH AS TRASH BINS AND PATIO FURNITURE. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THUNDERSTORMS ARE POSSIBLE OVER PORTIONS OF THE AREA FROM WEDNESDAY NIGHT THROUGH NEXT SATURDAY. IT IS TOO SOON TO DETERMINE THE POTENTIAL FOR SEVERE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. DLS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 436 PM CDT SAT APR 24 2010 IAZ067-078-088-089-ILZ024-025-242230- DES MOINES-HENDERSON-HENRY-LOUISA-MERCER-MUSCATINE- 436 PM CDT SAT APR 24 2010 ...DEVELOPING THUNDERTORMS... AT 429 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS BETWEEN KEITHSBURG AND MEDIAPOLIS...MOVING NORTHWEST AT 20 MPH. * THE THUNDERSTORM WILL MOVE TO NEAR CONSESVILLE...COLUMBUS JUNCTION AND WINFIELD BY 525 PM. * HEAVY RAIN AND HAIL UP TO ONE HALF INCH IN DIAMETER WILL BE POSSIBLE. LAT...LON 4103 9153 4146 9133 4115 9086 4093 9097 TIME...MOT...LOC 2132Z 113DEG 19KT 4110 9102 DLF
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
601 PM CDT SAT APR 24 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0559 PM HEAVY RAIN 5 NW CROTON 40.64N 91.74W
04/24/2010 E0.75 INCH VAN BUREN IA TRAINED SPOTTER
RAIN FELL IN 30 MINUTES
&&
DLFSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
621 PM CDT SAT APR 24 2010
IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-250115-
LEE IA-VAN BUREN IA-DES MOINES IA-JEFFERSON IA-HENRY IA-WASHINGTON IA-
KEOKUK IA-LOUISA IA-MCDONOUGH IL-HANCOCK IL-WARREN IL-HENDERSON IL-
MERCER IL-CLARK MO-SCOTLAND MO-
621 PM CDT SAT APR 24 2010
...HEAVY RAINS TO CONTINUE THROUGH 8 PM...
A LARGE AREA OF RAIN AND SCATTERED THUNDERSTORMS HAS PRODUCED
RAINFALL AMOUNTS UP TO AN INCH AND HALF SINCE 4 PM. THE HEAVIEST
RAINS SO FAR HAVE OCCURRED FROM THE ALEDO AREA WEST THROUGH WAPELLO
AND ALSO NEAR THE IOWA/MISSOURI BORDER FROM THE MISSISSIPPI RIVER
WEST THROUGH FARMINGTON. SPOTTER REPORTS FROM THE FARMINGTON AREA
INDICATED THAT SOME STREET FLOODING HAS ALREADY OCCURRED IN
FARMINGTON.
MODERATE TO HEAVY RAIN ALONG WITH SCATTERED THUNDERSTORMS ARE
EXPECTED TO CONTINUE MOVING WEST ACROSS THIS AREA THROUGH 8 PM. THE
RUNOFF FROM THE HEAVY RAINS WILL CAUSE PONDING OF WATER ON ROADS AND
ALSO SOME STREET FLOODING AS STORM DRAINS BECOME OVERWHELMED.
&&
LAT...LON 4020 9150 4025 9151 4025 9195 4030 9196
4030 9235 4060 9237 4061 9220 4116 9219
4115 9043 4027 9046 4028 9091 4020 9092PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
639 PM CDT SAT APR 24 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0637 PM HEAVY RAIN 6 W MEMPHIS 40.46N 92.28W
04/24/2010 U0.00 INCH SCOTLAND MO EMERGENCY MNGR
REPORTS OF PONDING WATER ON US 136 SLOWLING TRAFFIC TO A
CRAWL.
&&
MIKEZThe Quad Cities radar (KDVN), 65 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains of 1 to 4 inches resulted in some flash flooding of some streets in Galva, IL during the evening of April 24. The flood waters were 6 inches deep.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 2010Every state in 2010This day in weather historyWarnings in Illinois, 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: 218899.