Flooding continued along the North Raccoon River at Perry into early September from heavy rainfall in late August.
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.
Flooding continued along the North Raccoon River at Perry into early September from heavy rainfall in late August.
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 Aug 31, 10:50 PM CST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 1150 PM CDT MON AUG 31 2015 ...UPDATED FOR 01/06Z AVIATION DISCUSSION... .SHORT TERM /TONIGHT/... ISSUED AT 312 PM CDT MON AUG 31 2015 HIGH REMAINS ANCHORED OVER THE OHIO RIVER VALLEY WITH RETURN SOUTHEAST FLOW BEGINNING TO TAKE HOLD. ABUNDANT LOW LEVEL MOISTURE CONTINUES TO PROP UP DEW POINTS...NOW IN THE LOWER 70S...WITH CU FIELD ACROSS MOST OF THE FORECAST AREA AT THIS TIME. DESPITE THE CLOUDS TEMPERATURES HAVE CLIMBED INTO THE LOWER TO MID 80S PRIMARILY DUE TO SLIGHTLY INCREASED AFTERNOON MIXING. SYNOPTIC MODELS AGAIN SUGGEST A GENERAL RELAXATION OF THE SFC PRESSURE GRADIENT OVERNIGHT WITH WINDS OF 6 TO 8 MPH BY 10-13Z. ITS LIKELY ONCE AGAIN THAT SOME FOG WILL DEVELOP OVERNIGHT. THOUGH WIDESPREAD DENSE FOG IS NOT LIKELY THERE MAY BE A FEW POCKETS OF LOW VISIBILITY BY MORNING. FOR NOW WILL GO PATCHY ACROSS THE BOARD. USING THE MET GUIDANCE CROSSOVER TEMPERATURES SUGGEST ABOUT A 2-5 DEGREE SPREAD FROM CURRENT DEW POINTS SO FOG SHOULD OCCUR ONCE THE WINDS DROP OFF TOWARD DAWN. LOOKING MAINLY FOR 3-5SM ON AVERAGE WITH POCKETS OF 1- 2SM AND MAYBE A FEW SPOTS TO 1/4-1/2 MILE. OTHERWISE...LOWS IN THE MID TO UPPER 60S WITH EITHER SOME STRATUS OR FOG OR BOTH REFORMING OVERNIGHT. .LONG TERM /TUESDAY THROUGH MONDAY/... ISSUED AT 312 PM CDT MON AUG 31 2015 STILL LITTLE OVERALL CHANGE IN THE FORECAST FOR THE WEEK. NORTHWEST IOWA WILL CONTINUE TO BE ON THE PERIPHERIES OF THE NE STEERING FLOW ALOFT AND BE SUBJECTED TO MULTIPLE SHORT WAVES IN THE MIDDLE OF THE WEEK. AFTER WHICH THE RIDGE WILL AMPLIFY INTO THE WEEKEND AS A TROUGH DIGS INTO THE PACIFIC NORTHWEST AND EVENTUALLY TREKS EASTWARD THROUGH THE WEEKEND AND BREAKING DOWN THE RIDGE OVER IOWA. TUESDAY TO THURSDAY...WHILE THE STATE GENERALLY REMAINS UNDERNEATH THE RIDGE...THE NORTHWEST THIRD OF THE STATE WILL BE WELL WITHIN REACH OF SHORTWAVES MOVING THROUGH THE UPPER LEVEL FLOW. THE FIRST OF WHICH WILL MOVE THROUGH TUESDAY NIGHT/WEDNESDAY MORNING FOLLOWED BY A SECOND WEDNESDAY NIGHT/THURSDAY MORNING. FORCING APPEARS MOST ROBUST FOR THE CWA IN THE FORMER WITH MODELS DEPICTING A FAIR AMOUNT OF ISENTROPIC LIFT ABOVE THE MORNING INVERSION. HAVE CARRIED ONLY SLIGHT TO CHANCE POPS THROUGH DUE TO OVERALL WEAKNESS AND MODELS NOT IN THE GREATEST CONSENSUS ON EXTENT OR TIMING. TEMPS MAY ALSO BE A BIT WARM...NAMELY IN THE NORTHWEST HALF OF THE STATE...ESPECIALLY IF CLOUD COVER OR PRECIP COVERAGE ENDS UP GREATER THAN CURRENTLY EXPECTED. FRIDAY TO MONDAY...MODELS CONTINUE TO AMPLIFY THE RIDGE TOWARDS THE END OF THE WEEK AND INTO THE WEEKEND AS A TROUGH DIGS INTO THE PACIFIC NORTHWEST. AS A RESULT...SCANT PRECIP CHANCES WILL CONTINUE TO CLIP THE NORTHWEST PORTIONS OF THE STATE...BUT SHOULD OVERALL REMAIN DRY. QUITE POSSIBLY THE WARMEST TEMPS OF THE WEEK MAY COME ON FRIDAY WITH 850 TEMPS OF 20-21 DEG C IN THE AREA AND PRECIP CHANCES OFF TO THE NORTHWEST. MODELS HAVE NOT BEEN IN CONSENSUS WITH REGARD TO PROGRESSION OF THE WESTERN TROUGH THROUGH THE WEEKEND...ESPECIALLY WITH THE MOST RECENT RUNS. EURO NOW SLOWS THE PROGRESSION AND ACTUALLY PUSHES THE TROUGH UP INTO ALBERTA AND SASKATCHEWAN WHILE GFS SKIRTS IT ALONG THE US/CANADA BORDER AND DROPS A FRONT INTO THE REGION EARLY NEXT WEEK. AS A RESULT OF THE LACK OF CONSENSUS...HAVE WARMED TEMPS A FEW DEGREES SAT AND SUN OVER GUIDANCE...AND SLOWED POP PROGRESSION SUNDAY. && .AVIATION...01/06Z ISSUED AT 1150 PM CDT MON AUG 31 2015 CONCERNS WILL BE FOG AND STRATUS POTENTIAL THROUGH SUNRISE TUE MORNING. FOG HAS ALREADY DEVELOPED IN SOME LOCATIONS. EXPECT MAINLY MVFR/IFR CONDITIONS OVERNIGHT...WITH THE LOWEST CONDITIONS ACROSS WESTERN AND NORTHERN PORTIONS OF THE STATE...INCLUDING KMCW...KFOD AND KALO TERMINALS. SFC WIND IS OF LITTLE CONCERN THOUGH SOME MIXING EXPECTED WEST ON TUE. SFC TROF TO THE WEST OF IA WILL BEGIN SLIDING CLOSER TO THE STATE LATE IN THE TAF PD...WITH SLIGHT CHANCE OF SHRA/TSRA WEST AND NORTH. ATTM HAVE LEFT OUT MENTION IN TAFS DUE TO RELATIVELY LOW PROBS. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...REV LONG TERM...CURTIS AVIATION...ZOGG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 457 PM CDT MON AUG 31 2015 IAZ059-061-074-012200- DALLAS-JASPER-MARION- 457 PM CDT MON AUG 31 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT RIVER FLOOD WARNINGS ARE IN EFFECT FOR PORTIONS OF THE AREA. PLEASE SEE THE NATIONAL WEATHER SERVICE WEB PAGE AT WEATHER.GOV/DMX FOR MORE INFORMATION. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY RIVER FLOOD WARNINGS WILL REMAIN IN EFFECT FOR PORTIONS OF THE AREA THROUGH AS LATE AS WEDNESDAY MORNING. PLEASE SEE THE NATIONAL WEATHER SERVICE WEB PAGE AT WEATHER.GOV/DMX FOR MORE INFORMATION. THUNDERSTORM CHANCES WILL RETURN AT INTERVALS FROM LATE TUESDAY NIGHT ONWARD...PRIMARILY IN NORTHWEST IOWA. THE SEVERE WEATHER THREAT IS LOW THROUGH AT LEAST SATURDAY. HIGHER THUNDERSTORM CHANCES ARE THEN FORECAST AROUND SUNDAY. THE SEVERE WEATHER THREAT DURING THAT TIME IS UNCERTAIN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. IAZ004>007-015>017-023>028-033>039-044>050-057-058-060-062- 070>073-075-081>086-092>097-012200- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE- BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-POLK-POWESHIEK-CASS- ADAIR-MADISON-WARREN-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE- WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS- 457 PM CDT MON AUG 31 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THUNDERSTORM CHANCES WILL RETURN AT INTERVALS FROM LATE TUESDAY NIGHT ONWARD...PRIMARILY IN NORTHWEST IOWA. THE SEVERE WEATHER THREAT IS LOW THROUGH AT LEAST SATURDAY. HIGHER THUNDERSTORM CHANCES ARE THEN FORECAST AROUND SUNDAY. THE SEVERE WEATHER THREAT DURING THAT TIME IS UNCERTAIN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
The North Raccoon River at Perry crested at 16.35 feet on 1 September 2015 at 8:30 AM CDT.
The South Skunk River at Colfax crested at 18.33 feet on 01 September 2015 at 5:15 PM CDT.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2015Every state in 2015This day in weather historyWarnings in Iowa, September 2015
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: 598436, 598953.