Another period of heavy rainfall affected the state as several MCS's swept across the state. A nearly stationary frontal boundary that had been in place through most of the month continued to be the focal point for thunderstorm activity.
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 DMX wrote it up.
Another period of heavy rainfall affected the state as several MCS's swept across the state. A nearly stationary frontal boundary that had been in place through most of the month continued to be the focal point for thunderstorm activity. Soils over the state were saturated or nearly so and rivers never fell much below flood stage from the previous events, and some hadn't even fallen yet. Agricultural losses continued to mount as the flooding this late in the planting season closed the window in the possibility of replanting waterlogged fields. Damage was done in many cities throughout the state during the month as wave after wave of flood waters inundated basements. A more complete discussion of the months flooding is contained in the second flooding event of the month from 12-21 June 2010. An additional problem by the end of the month was that the major reservoirs were at capacity. Below is a summary of reservoir conditions. Rathbun Lake started near 914 foot MSL and then increased to 921.50 ft MSL by the 30th of the month. The Chariton River near Rathbun Lake saw a mean discharge of near 1500 cfs which occurred from the 1st through 5th of the month. The flow was then decreased to approximately 159 to 500 cfs through the 9th of the month. From there the flow was increased to 1250-1860 cfs through the end of the month. It ended the month at 1570 cfs. Saylorville Lake elevations began the month at 858.04 feet MSL and it was allowed to fall to 857.10 feet MSL by the 11th of the month. It then rose to 861.56 ft by the 14th of the month due to an increase in rainfall throughout the upstream basin. As more heavy rain fell the level of the reservoir quickly rose to 885.89 feet by the end of the month. Discharge from the reservoir began at 6540 cfs and was decreased to 2840 cfs by the 15th of the month. After heavy rainfall occurred, the discharge was increased to 10,600 cfs on the 19th of the month. It was gradually increased to 22,800 cfs by the 29th of the month. Lake Red Rock rose dramatically by the end of the month. It began at 760.70 ft MSL and dropped to 759.88 ft MSL on the 11th of the month. It then rose to 778.59 ft MSL by the end of the month. Discharge out of Red Rock began at 21,600 cfs on the first of the month and was decreased to 6060 cfs by the 14th of the month. Due to rainfall, the outflow was then dramatically increased to 50,900 cfs by the end of the month.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 25, 2:40 AM CST, 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 340 AM CDT FRI JUN 25 2010 .SHORT TERM /TODAY/... LITTLE OF CONCERN INITIALLY. MCS DRIVEN BY KINEMATIC AND THERMODYNAMIC FORCING AHEAD OF ND/SRN CANADA SHORT WAVE SHOULD REMAIN NORTH OF IA THIS MORNING. HOWEVER ATTENTION WILL TURN TOWARD THE IA/MN BORDER FOR REDEVELOPMENT DURING PEAK HEATING AS THIS SYSTEM AND OTHER WEAK WAVES TOPPING RIDGE DRIVE SFC FRONT INTO WRN SD/SRN MN. NAM/GFS BOTH DEPICT 4000 J/KG MLCAPES APPROACHING 00Z WITH DIMINISHING CINH. FEEL MUCH OF THE CONVECTION WILL BE AFTER 00Z...BUT HAVE MENTIONED SLIGHTS/LOW CHANCES JUST INTO NRN IA. DEEP SHEAR IS NOT GREAT...BUT CONSIDERING THE AMOUNT OF INSTABILITY IT SHOULD BE MORE THAN ADEQUATE FOR SUPERCELLS AND SVR WX POTENTIAL IF STORMS DO INDEED MAKE IT INTO STATE. LITTLE CHANGE TO GOING HIGHS TODAY WITH INCREASING LOW LEVEL WAA IN SSW WINDS BOOSTING MAXES A CATEGORY OR TWO HIGHER THAN THU. .LONG TERM /TONIGHT THROUGH TUESDAY/... AN ACTIVE WEATHER PATTERN RETURNS TO CENTRAL IOWA THROUGH THE WEEKEND. HIGH PRESSURE PUSHES EAST DURING THE DAY WITH STRONG WARM ADVECTION OUT TO THE WEST. THIS MOVES INTO CENTRAL IA TONIGHT AND BY 06Z WE HAVE 3000-3800 CAPES NOSING INTO NW IA. THE BEST SHEAR REMAINS IN SRN MN BUT VERY CLOSE TO THE IA BORDER. THE GFS KEEPS A STRONG CAP IN PLACE OVER IA HOWEVER THE NAM SHOWS SOME WEAKNESS IN THE CIN EXTENDING DOWN TOWARDS THE HIGHWAY 30 CORRIDOR. GIVEN THE DYNAMICS OF THIS SYSTEM AND THE FACT THAT CORFIDI VECTORS ARE NORTH NORTHWEST IT WOULD SEEM REASONABLE THAT THERE IS AT LEAST A PRETTY GOOD POTENTIAL FOR THE STORMS TO DROP SOUTH INTO IA FM MN... ESPECIALLY IF THE WEAKNESS IN CIN AS DEPICTED BY THE NAM OCCURS. FURTHERMORE...THE 4KM WRF MODEL...WHICH HAS A GOOD HANDLE ON THE ONGOING CONVECTION IN THE DAKOTAS AND MN...PICKS UP ON THIS IDEA OF DROPPING STORMS SOUTH INTO IA THROUGH ABOUT 09Z THIS FIZZLING THE STORMS OUT. BACK TO THE NAM...THE CIN REBUILDS IN CENTRAL IOWA AFTER 09Z WITH CONTINUED WEAKER CIN IN SERN MN. THE WRF DOES NOT SEEM TO PICK UP ON THIS SO MUCH BUT A LEFT CHC POPS NORTH/NORTHEAST TO ACCOUNT FOR THIS. WILL BE MENTIONING SEVERE IN ZONES AND HWO WITH MAIN THREAT WIND. WE DO IT ALL AGAIN SATURDAY NIGHT/SUNDAY AS THE NEXT SHORTWAVE MOVES IN AND WE GET A STRONGER FRONTAL BOUNDARY TO CONTEND WITH. ADDITIONAL SEVERE THREAT DURING THIS TIME FRAME AS WELL. BEYOND SUNDAY...UPPER RIDGE BUILDS OVER THE ROCKIES AND SHIFTS INTO THE CENTRAL PLAINS INTO NEXT WEEK SO BE GET A RESPITE FROM THE THUNDERSTORM ACTIVITY ALONG WITH SOME SEASONAL TEMPS AND HUMIDITY. && .AVIATION... 25/06Z...VFR CONDITIONS WILL THROUGH NOON ON FRIDAY WITH HIGH PRESSURE IN PLACE. BREEZY SOUTHERLY WINDS WILL DEVELOP ON FRIDAY AS WELL. POTENTIAL FOR LOCALIZED MVFR CIGS THROUGH WOULD BE SCT AND MOST CUMULUS DEVELOPMENT SHOULD BE ABOVE 3 KFT DURING THE AFTERNOON. A FEW THUNDERSTORMS ARE POSSIBLE LATE FRI AFTERNOON AND EVENING. HAVE ADDED CB MENTION DURING THIS PERIOD BUT CONFIDENCE IN AREAL COVERAGE STILL LOW. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...BSS AVIATION...DONAVON LONG TERM...FAB
The national radar mosaic for the moment the first event began.
18 flood. Local standard time, as filed.
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: 231130, 231131, 231138, 231141, 231136, 231133, 231143, 231134, 231146, 231147, 231137, 231145, 231142, 231144, 231140, 231135, 231139, 231132.