A frontal system over the area brought two rounds of showers and thunderstorms to the mid Mississippi Valley on June 18. The first was during the midday to early afternoon hours, quickly followed by the second round in the late afternoon and evening.
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 frontal system over the area brought two rounds of showers and thunderstorms to the mid Mississippi Valley on June 18. The first was during the midday to early afternoon hours, quickly followed by the second round in the late afternoon and evening. While there were scattered reports of hail, heavy rain and damaging winds were reported across much of the area. As a result of the torrential rains, flash flooding was rather widespread. Rainfall totals through mid evening were widely varied; ranging from a couple tenths of an inch to well over 2 inches in some locations. A few lightning strikes also caused some damage. Afternoon highs were mainly in the 80s, with a few low 90s south of highway 34.
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 Jun 18, 1:52 AM CST, 8 hours 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 252 AM CDT FRI JUN 18 2010 .DISCUSSION...TODAY THROUGH THURSDAY... ...SEVERE WEATHER AND HEAVY RAINFALL APPEAR POSSIBLE THIS AFTERNOON...AND THIS EVENING... HOWEVER...THE EXACT DETAILS OF ANY POTENTIAL EVENT ARE NOT TOTALLY CERTAIN AS IT WILL BE STRONGLY INFLUENCED BY MESOSCALE FEATURES LEFT FROM THIS MORNINGS MCS. SYNOPTICALLY...A SEVERE WEATHER EVENT SEEMS IN THE OFFING AS LONG AS WE BUILD SUFFICIENT CAPE AND CAN KEEP WINDS BACKED AHEAD OF THE FRONT. IN ALL LIKELIHOOD THE CURRENT MCS SHOULD ASSIST IN KEEPING WINDS BACKED...BUT IT POTENTIALLY COULD ROB CAPE VALUES KEEPING THE POTENTIAL EVENT INTO A MUCH LOWER MAGNITUDE. THAT ALL SAID...THE CURRENT MCS SEEMS TO HAVE HIT A WALL OVER THE IOWA AND MISSOURI BORDER. LOOKING AT THE CURRENT EVOLUTION...IT APPEARS THAT THE MCS SHOULD PROPAGATE INTO NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS THIS MORNING BEFORE DISSIPATING. ANOTHER AREA OF DEVELOPING STORMS IS FOUND IN CENTRAL NEBRASKA....WHERE THE LLJ IS INTERSECTING THE 850MB BOUNDARY. THIS MAY LIGHT UP FURTHER BEFORE DAWN...AND COULD BE ANOTHER CAPE ROBBING MECHANISM. DESPITE THE TWO AREAS OF CAPE KILLING CONCERN...IT DOES APPEAR THAT AT LEAST SEVERAL HOURS OF PREFRONTAL HEATING WILL OCCUR. THUS...THE LATE AFTERNOON THROUGH MID EVENING COLD FROPA WITH GOOD DYNAMICS CARRIES A LIKELY CHANCE OF STRONG TO SEVERE CONVECTION. INITIALLY...SUPERCELLS SHOULD FORM ALONG THE FRONT...ALONG AND NORTH OF THE OUTFLOW BOUNDARY. THIS WILL CARRY A TORNADO THREAT...AS WELL AS WIND AND HAIL. BY EARLY EVENING...A LINEAR STORM MODE IS FAVORED...WITH WIND BEING THE MAIN THREAT UNTIL THE LINE EXITS THE EASTERN CWA LATE IN THE EVENING. AFTER MIDNIGHT...SOME SCATTERED STORMS MAY FIRE ABOVE THE COLD POOL...BUT THIS THREAT APPEARS LOW AT THIS TIME. THE FORECAST IS DOMINATED BY A HIGH POTENTIAL FOR HEAVY RAINFALL...FLASH AND RIVER FLOODING...AND SEVERE RISK THROUGHOUT. THIS IS A VERY SIMILAR SCENARIO PAINTED BY PREVIOUS AFD ISSUANCES. DUE TO THE CURRENT MCS...WE WILL LEAVE THE FORECAST AS IS...WHICH IS EXTREMELY WET AND STORMY. THIS PERIOD WILL BE ADDRESSED STRONGLY IN THE HWO PRODUCT. SINCE THE DEVELOPMENT OF STORMS IS EXPECTED TO BE PROGRESSIVE TONIGHT...AND SINCE OVERNIGHT QPF DID NOT APPEAR TOO HIGH...GENERALLY AROUND 0.5 INCH...A FLASH FLOOD WATCH HAS NOT BEEN ISSUED. THAT SAID...TODAY AND TONIGHTS STORMS COULD POSE A RAPID RUN OFF FLASH FLOOD THREAT THAT COULD OVER WHELM STORM DRAINS IN ANY URBAN LOCATION...AND THAT WILL NEED TO BE WATCHED CLOSELY. ...ERVIN... && .AVIATION... CURRENT MCS OVER THE AREA IS SLOWLY DECAYING. BOUNDARIES FROM MCS WILL LIKELY CAUSE CONVECTION TO PERSIST THROUGH 14-15Z BEFORE ENDING. VSBYS 3-5SM WITH VCTS POSSIBLE WITH CIGS 2-3KFT AT WORST. NEW CONVECTION TO FIRE ALONG/AHEAD THE COLD FRONT AFT 18Z. ALL TAF SITES WILL BE AFFECTED WITH THE MOST LIKELY TIME PERIOD BEING 22Z/18 THROUGH 05Z/19. DURING THIS TIME PERIOD EXPECT VCTS WITH TSRA LIKELY. VSBYS OF 3-5SM WITH ARND 1SM IN HEAVIER TSRA. CIGS JUST ABV 3KFT BUT 1-2KFT CIGS LIKELY IN TSRA. VFR CONDITIONS AFT 06Z/19. ...08... && .HYDROLOGY... ANOTHER HEAVY RAIN EVENT WILL IMPACT THE AREA THIS AFTERNOON AND TONIGHT WITH ANOTHER HEAVY RAIN EVENT SUNDAY. SEVERAL MORE APPEAR POSSIBLE BEYOND. THE EXACT IMPACT TO AREA WATERWAYS IS NOT FULLY KNOWN BUT MODERATE TO SIGNIFICANT ADDITIONAL RISES WILL OCCUR. FLOODING ON SMALLER TRIBUTARY RIVERS IS LIKELY. EMERGENCY MANAGERS AND ANYONE LIVING NEAR OR WITH INTERESTS ALONG AREA RIVERS AND STREAMS SHOULD PAY ATTENTION TO BOTH WEATHER AND RIVER FORECASTS OVER THE NEXT 7 DAYS. ...ERVIN... && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. && ERVIN/08
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 914 AM CDT FRI JUN 18 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-191415- 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- 914 AM CDT FRI JUN 18 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...TODAY AND TONIGHT THE STORM PREDICTION CENTER IS FORECASTING A MODERATE RISK FOR SEVERE THUNDERSTORMS OVER MUCH OF THE OUTLOOK AREA TODAY AND TONIGHT. A COLD FRONT WILL MOVE THROUGH THE REGION THROUGH TONIGHT...AND IS LIKELY TO PRODUCE ANOTHER ROUND OF STRONG TO SEVERE THUNDERSTORMS. AS TEMPERATURES RISE TO THE UPPER 80S TO LOWER 90S...THE COLD FRONT WILL SWEEP INTO THE AREA. A LINE OF SEVERE THUNDERSTORMS WILL MOVE ACROSS THE OUTLOOK AREA LATE THIS MORNING AND AFTERNOON. DAMAGING WINDS OF 60 TO 70 MPH CAN BE EXPECTED. SUPERCELL THUNDERSTORMS MAY ALSO FORM THIS AFTERNOON...WITH THE THREAT OF ISOLATED TORNADOES...LARGE HAIL...AND DAMAGING WINDS. THIS IS EXPECTED MAINLY OVER NORTHEAST IOWA. BY EARLY EVENING...THE STORMS ARE EXPECTED TO MERGE INTO ANOTHER LINE...WITH A THREAT OF HEAVY RAINFALL AND DAMAGING WINDS OVER ALL OF THE OUTLOOK AREA. AREA RIVERS ARE EXPERIENCING FLOODING. PLEASE SEE THE LATEST FLOOD STATEMENTS AND FLOOD WARNINGS FOR DETAILS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY MANY ADDITIONAL ROUNDS OF STRONG TO SEVERE THUNDERSTORMS WITH HEAVY RAINFALL ARE EXPECTED OVER THE OUTLOOK AREA THIS WEEKEND AND UPCOMING WEEK. A NEAR DAILY THREAT OF FLASH FLOODING...AND INCREASING RIVER FLOODING IS EXPECTED. IN ADDITION...AREAS SOUTH OF INTERSTATE 80 MAY EXPERIENCE HEAT INDEX READINGS OVER 100 DEGREES MONDAY THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... AN EMERGENCY MANAGERS CONFERENCE CALL WILL BE CONDUCTED AT 1030 AM THIS MORNING FOR ALL COUNTIES. SPOTTER ACTIVATION WILL BE REQUIRED TODAY AND TONIGHT. HAASE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 954 AM CDT FRI JUN 18 2010 IAZ040>042-051>053-063>065-067-076>078-087>089-098-099-MOZ009-010- 181700- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-IOWA-JOHNSON-CEDAR- MUSCATINE-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-HENRY IA-DES MOINES- VAN BUREN-LEE-SCOTLAND-CLARK- INCLUDING THE CITIES OF...INDEPENDENCE...MANCHESTER...DUBUQUE... VINTON...CEDAR RAPIDS...ANAMOSA...MARENGO...IOWA CITY...TIPTON... MUSCATINE...SIGOURNEY...WASHINGTON...WAPELLO...FAIRFIELD... MOUNT PLEASANT...BURLINGTON...KEOSAUQUA....FORT MADISON... MEMPHIS...KAHOKA 954 AM CDT FRI JUN 18 2010 ...LINE OF SEVERE THUNDERSTORMS APPROACHING EASTERN IOWA... AT 950 AM DOPPLER RADAR INDICATED A NEARLY SOLID LINE OF STRONG TO SEVERE THUNDERSTORMS FROM MASON CITY TO WEST OF DES MOINES AND THEN INTO SOUTHWEST IOWA. THIS LINE WAS MOVING EAST AT 40 TO 50 MPH AND HAS BEEN ASSOCIATED WITH WIND DAMAGE AND QUARTER SIZE HAIL. THESE THUNDERSTORMS WILL BE MOVING INTO EASTERN IOWA AND SHOULD BE NEARING AN INDEPENDENCE TO FAIRFIELD LINE BETWEEN 11 AM AND 12 PM. WINDS OF 40 TO 60 MPH WITH SOME GUSTS TO 70 MPH CAN BE EXPECTED ALONG WITH QUARTER SIZE HAIL. DUE TO SATURATED SOILS FROM RECENT HEAVY RAINS THESE STRONG WINDS CAN KNOCK MANY TREES DOWN. WHEN THREATENING WEATHER APPROACHES OR A WARNING IS ISSUED YOU SHOULD SEEK SHELTER IN A STURDY BUILDING. HAASE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1104 AM CDT FRI JUN 18 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1045 AM FLOOD AUGUSTA 40.75N 91.28W
06/18/2010 LEE IA COUNTY OFFICIAL
OLD QUARRY ROAD IS NOW CLOSED DUE TO FLOOD WATERS FROM
THE SKUNK RIVER FLOWING ONTO THE ROAD. AT THIS TIME...THE
WATER IS 2 INCHES DEEP AND SPANS ABOUT 10 FEET.
&&The Des Moines radar (KDMX), 129 km away, was scanning. The volume nearest the first event began at 16:33 UTC.
51 thunderstorm wind, 9 hail, 6 flash flood, 2 lightning. Local standard time, as filed.
A 60 mph wind gust was measured about 1 mile south of Keystone, IA at 1134 am June 18.
Quarter-sized hail fell 1 mile south southwest of Belle Plaine, IA at 1139 am June 18.
Wind gusts estimated to be 65 mph were observed in Norway, IA at 1155 am June 18.
A 63 mph wind gust was measured by the ASOS at The Eastern Iowa Airport just south of Cedar Rapids, IA at 1209 pm June 18.
Wind gusts were estimated to be 65 mph 1 mile east of the Cedar Rapids Airport at 1214 pm June 18.
Wind gusts estimated to be 70 mph blew out the windows of several cars near Coralville Mall around 1225 pm June 18. In addition, trees and signs were blow down.
Wind gusts estimated to be 65-70 mph uprooted trees and blew down hundreds of limbs, knocking out power throughout Mount Vernon at 1230 pm CDT June 18.
Wind gusts estimated to be 65-70 mph snapped trees, downed utility lines, and disrupted power to more than 1,000 customers in West Branch, IA from about 1230 pm until 1245 pm CDT June 18. One tree fell onto 2 cars and another tree landed on a church. Branches were down throughout town.
Wind gusts estimated to be 65 mph blew down some power lines on 5th street in Cedar Rapids around 1237 pm CDT June 18. This report was relayed by KCRG. The local paper later reported that a garage had also been destroyed by falling trees in Cedar Rapids.
Wind gusts estimated to be 70 mph blew the end off an enclosed shed at the intersection of Highway 30 and X40 in Mechanicsville, IA around 1238 pm June 18.
Wind gusts estimated to be 60 mph blew down some trees onto houses in North Liberty, IA around 1240 pm June 18.
Wind gusts estimated to be 65 mph blew a small radio tower down onto a building on 5th Street in Coralville, IA around 1240 pm CDT June 18. In addition, a number of power lines were blown down and an estimated 50-60 treese were damaged.
Wind gusts estimated to be 60 to 75 mph blew down numerous trees and power lines near Van Buren, Market, Church, and Fairchild streets in Iowa City around 1240 pm CDT June 18. At least 2 trees landed on homes.
Severe thunderstorm winds downed large trees in West Liberty.
Wind gusts were estimated to be 70 mph at Exit 265 on Interstate 80 or about 2 miles south of Rochester, IA at 1243 pm June 18.
Wind gusts were estimated to be 55 to 60 mph in Anamosa, IA at 1249 pm June 18. Some sweet corn was flattened. In addition, the visibility was zero due to heavy rain.
Wind gusts estimated to be 70 mph blew down several large trees in Anamosa, IA at 1250 pm CDT June 18. One tree fell onto a house. Power outages were also observed. The local paper later reported that most of the tree damage occurred north of Main Street.
Wind gusts estimated to be 60 mph blew down some large trees about 1 mile east southeast of Anamosa, IA around 1250 pm June 18.
Wind gusts were estimated to be 70 to 80 mph in Mechanicsville, IA around 1 pm June 18. This report was relayed by KGAN.
Wind gusts estimated to be 70 mph blew down a number of trees onto cars and power lines in Clarence, IA around 1 pm June 18. This report was relayed by KGAN.
Severe thunderstorm winds tore half of the roof and most of the siding off a hog confinement building.
Wind gusts estimated to be 65 mph topped off a maple tree on the northwest side of Davenport, IA at 120 pm June 18.
Wind gusts were estimated to be 50 to 60 mph 5 miles west southwest of Bettendorf, IA or in Davenport, IA at 125 pm June 18.
Wind gusts estimated to be 60 mph blew down numerous 6 to 7 inch diameter tree limbs near West Lake Park or about 2 miles east of Blue Grass, IA around 125 pm June 18.
Wind gusts were estimated to be 50 to 60 mph in Eldridge, IA at 126 pm CDT June 18. A local newspaper later included a photograph of a large tree that was toppled in Eldridge.
Wind gusts estimated to be 65 mph blew a semi over at mile marker 164 on Highway 61 about 6 miles north of Maquoketa, IA at 131 pm June 18.
Wind gusts were estimated to be 70 mph near Bellevue, IA at 141 pm June 18.
Wind gusts estimated to be 65 mph blew down some 6 inch diameter tree limbs about 2 miles south southwest of Calamus, IA at 142 pm June 18.
Heavy rains resulted in some flash flooding across Highway 20 just south of Winthrop, IA during the late afternoon of June 18. The water had receded by 6 pm.
Wind gusts were estimated to be 55 to 60 mph 7 miles southwest of Vinton, IA at 545 pm June 18.
Wind gusts measured to be 70 mph were observed about 5 miles north northeast of Cedar Rapids, IA at 608 pm June 18.
Wind gusts estimated to be 65 mph were observed about 3 miles north of Cedar Rapids, IA at 615 pm June 18.
Heavy rains resulted in flash flooding of streets and creeks in Cedar Rapids, IA and Marion, IA during the early evening of June 18.
Wind gusts estimated to be 65-70 mph blew down trees and numerous large tree limbs in Wyoming, IA around 638 pm CDT June 18. The local paper also reported that a power pole had been toppled by a tree during the same storm; at least one tree landed on a car; another tree fell onto a garage.
Wind gusts estimated to be 50 to 60 mph were observed in Stanwood, IA at 643 pm June 18.
Wind gusts measured to be 59 mph were observed about 1 mile north northeast of Olin, IA at 644 pm CDT June 18. An area newspaper later reported that a tree was downed by lightning on the ball field.
Trees in the cemetery in Oxford Junction sustained major damage. Tree damage to trucks was reported in nearby Oxford Mills. Trees were uprooted and branches down in town and throughout the surrounding rural community.
Quarter-sized hail fell in Fairfax, IA at 648 pm June 18.
Heavy rains resulted in flash flooding of several streets in Vinton, IA and Garrison, IA during the evening of June 18. Flood waters covered Highway 218 about 3 miles south of Vinton. In addition, Hinkle Creek near Garrison was rising rapidly.
Wind gusts estimated to be 70 to 80 mph blew down some trees in Lost Nation, IA at 656 pm CDT June 18. At least one of the trees landed on power lines. Part of the lumber yard's tin roof was peeled off.
Around 7 pm CDT in Lowden, severe thunderstorm winds downed trees and power poles.
Wind gusts estimated to be 55 to 65 mph blew down some 4 to 5 inch diameter tree limbs about 4 miles east of What Cheer, IA at 703 pm June 18.
Wind gusts estimated to be 60 mph blew some shingles off of some roofs about 2 miles south southwest of Calamus, IA at 706 pm June 18.
Wind gusts estimated to be 65 to 75 mph were observed 4 miles north of Richland, IA at 710 pm June 18.
Wind gusts estimated to be 70 mph blew down some power lines and trees about 8 miles north of Donahue, IA around 715 pm June 18. Two trees fell onto a house. A nearby garage sustained damage to the roof and another garage was knocked down.
Wind gusts measured to be 63 mph were observed by the ASOS at the Davenport Municipal Airport at 721 pm June 18.
Wind gusts estimated to be 60 mph blew down some tree limbs and flattened some corn near Grand Mound, IA at 722 pm June 18.
Wind gusts estimated to be 60 mph were observed in Maquoketa, IA at 722 pm CDT June 18. Newspapers later reported that numerous trees and branches were downed across town.
Wind gusts were measured at 75 mph in Preston, IA at 724 pm CDT June 18.
Wind gusts estimated to be 60 mph blew down some large tree limbs 1 mile west of Bettendorf, IA around 725 pm June 18.
Wind gusts estimated to be 60 mph caused some roof damage near Western Avenue and W 61st Street in Davenport, IA at 735 pm June 18.
Wind gusts estimated to be 60 to 70 mph were observed 1 block north of Vander Veer Park in Davenport, IA at 735 pm June 18.
Quarter-sized hail fell in Durant, IA at 739 pm June 18.
Wind gusts estimated to be 50 to 60 mph were observed in Durant, IA at 739 pm June 18.
Wind gusts estimated to be 70 mph blew a semi over at mile marker 306 on Interstate 80 or about 1 mile west of Le Claire, IA at 742 pm CDT June 18. In addition, a 35 foot tall tree and some highway signs along I-80 were blown over.
Wind gusts estimated to be 70 mph displaced a shed in West Branch, IA at 814 pm June 18. The shed landed across the street from the spotter's residence.
Wind gusts estimated to be 70 mph blew part of a roof off of the grandstand at the fairgrounds, tore part of a roof off a brick building on Main Street, downed power lines, and damaged numerous trees and branches in What Cheer, IA at 825 pm CDT June 18.
Heavy rains resulted in flash flooding of Mud Creek between Dixon and Donahue and also a local drainage creek in Buffalo.
Heavy rains resulted in flash flooding in Muscatine, IA during the evening of June 18. Water was flowing across the road near the intersection of Highway 61 and Isett Avenue.
Quarter-sized hail fell about 5 miles northeast of Fairfield, IA at 850 pm June 18.
A church steeple in Lockridge was struck by lightning, setting the building on fire. Little was rescued from the building. The time is estimated.
Lightning struck a light pole near the main stage of Burlington Steamboat Days, blowing a chunk of concrete from the base of the pole and damaging sound equipment. A nearby man was injured by the lightning and another witness was treated for hyperventilation.
Heavy rains resulted in flash flooding in Louisa County and several road closures.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2010Every state in 2010This day in weather historyWarnings in Iowa, June 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: 243265, 243266, 243267, 243269, 243274, 243277, 243280, 243300, 243282, 243285, 243288, 243294, 243298, 246104, 243303, 243304, 243306, 243310, 243314, 243317, 243322, 246116, 243693, 243694, 243698, 243822, 243835, 243836, 243837, 243863, 243839, 243840, 243841, 244408, 244413, 244422, 244425, 244426, 244438, 246115, and more.