Heavy rain caused minor flooding of the Rock River in late June.
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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 FSD wrote it up.
Heavy rain caused minor flooding of the Rock River in late June.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Jun 16, 3:15 AM CST, 2 hours 45 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 415 AM CDT THU JUN 16 2011 .DISCUSSION... MODELS PAINTING A LITTLE DIFFERENT PICTURE FOR THE NEXT FEW DAYS THAN WAS SEEN YESTERDAY MORNING...BUT MULTIPLE MODELS SHOWING DECENT CONSENSUS IN THE TREND...LENDING SOME CONFIDENCE TO REMOVING PRECIP CHANCES FROM AT LEAST THE FIRST HALF OF THE UPCOMING WEEKEND. FIRST THOUGH...HAVE REMOVED SLIGHT CHANCE POPS FROM MISSOURI RIVER VALLEY THIS MORNING...AS CONVECTIVE COMPLEX HAS BEEN TRACKING FARTHER SOUTH IN NEBRASKA. COULD STILL SEE SOME ACCAS OR CIRRUS BLOWOFF FROM SOUTHERN STORMS MOVING THROUGH THE FAR SOUTHERN CWA THIS MORNING SO WILL KEEP SOME HIGHER CLOUD COVER THERE. START TO SEE MOISTURE RETURN INTO WESTERN CWA THIS AFTERNOON AS SURFACE RIDGE SHIFTS EAST...AND WHILE FORCING REMAINS WEST OF THE AREA THROUGH THE AFTERNOON...COULD SEE GREATER COVERAGE OF CU DEVELOPMENT IN THE WEST BUT STRONG CAP SHOULD INHIBIT ANY THUNDERSTORM DEVELOPMENT UNTIL WEAK UPPER WAVE SLIDES NORTHEAST OUT OF THE BASE OF MAIN TROUGH LOCATED OVER THE NORTHERN ROCKIES. GREATEST INSTABILITY WITH CAPES OF 1500-3000 J/KG ALONG WITH DECENT DEEP LAYER SHEAR OF 30-40KTS /STRONGER ON NAM THAN OTHER MODELS/ COME TOGETHER OVER THE SOUTHWEST CWA THIS EVENING AND WILL CONTINUE A MENTION OF POSSIBLE SEVERE STORMS SOUTHWEST OF CHAMBERLAIN TO YANKTON LINE. SCATTERED STORMS EXPECTED TO LIFT NORTHEAST ACROSS THE CWA OVERNIGHT/FRIDAY MORNING AS THE WAVE LIFTS INTO THE RED RIVER VALLEY. AT THIS POINT IS WHEN WE BEGIN TO SEE TRANSITION MENTIONED ABOVE... WITH MODELS SHOWING STRONGER COLD FRONT PUSHING INTO THE WESTERN CWA FRIDAY AFTERNOON. CONSISTENT TIMING AMONG THE MODELS IN MOVING THE BOUNDARY ACROSS OUR SD COUNTIES BY 18/00Z...THEN EXITING THE EASTERN CWA BY 18/06Z...WITH SIGNIFICANT DRYING WITHIN DEEP WESTERLY FLOW BEHIND THE FRONT. AGAIN SEEING STRONG DEEP LAYER SHEAR ALONG WITH CAPE VALUES OF 1500-2500J/KG IN MOIST AIRMASS AHEAD OF THE BOUNDARY FRIDAY AFTERNOON/EVENING. WITH ELEVATED ACTIVITY EXPECTED ACROSS THE FORECAST AREA IN THE MORNING...MAY TAKE A WHILE FOR AIRMASS TO DESTABILIZE ENOUGH FOR STRONGER STORMS TO DEVELOP...BUT STRONG FORCING WITH COLD FRONT/UPPER TROUGH SHOULD ALLOW FOR SOME STORMS TO REACH SEVERE LIMITS FRIDAY AFTERNOON/EVENING. DRY SURFACE HIGH SLIDES ACROSS THE CWA SATURDAY AND SATURDAY EVENING AND HAVE REMOVED POPS ALTOGETHER FOR THESE PERIODS. MODELS IN FAIRLY GOOD AGREEMENT IN KEEPING SURFACE BOUNDARY LOCKED IN OVER THE CENTRAL PLAINS THROUGH SUNDAY WITH 850MB WARM FRONT LIFTING BACK TO NEAR I-80 CORRIDOR IN SOUTHERN NEBRASKA BY LATE SUNDAY AFTERNOON. GFS/GEM BOTH SHOW ANOTHER WEAK WAVE LIFTING NORTHEAST ACROSS OUR AREA SO WILL KEEP SOME LOW CHANCE POPS OVER THE CWA FOR SUNDAY...BUT WITH BOUNDARIES WELL TO THE SOUTH...THREAT OF SEVERE WEATHER SHOULD REMAIN SOUTH OF THE FORECAST AREA. MONDAY/MONDAY NIGHT COULD BE MORE ACTIVE...WITH BOTH GFS/GEM SHOWING STRONGER UPPER TROUGH AND ASSOCIATED SURFACE LOW MOVING ACROSS THE FORECAST AREA. TIMING/LOCATION DIFFERENCES AT THIS RANGE OF COURSE BUT GENERAL CONSENSUS POINTS TO STRONGER INSTABILITY/SHEAR ACROSS NORTHWEST IOWA IN THE LATE AFTERNOON/EVENING...WITH POTENTIAL FOR HEAVY RAINS SOMEWHERE IN THE CWA INTO MONDAY NIGHT. TODAY SHOULD BE WARMEST DAY OF THE NEXT FEW...WITH MOST AREAS EXPECTED TO CLIMB INTO THE 80S. CLOUD COVER/RAIN SHOULD HOLD TEMPS DOWN IN THE MID 70S TO LOWER 80S AHEAD OF THE COLD FRONT FRIDAY... WITH SIMILAR READINGS EXPECTED IN SLIGHTLY COOLER AIRMASS THROUGH THE WEEKEND. && .AVIATION... LIGHT AND VARIABLE WINDS WILL CONTINUE THROUGH THE EARLY MORNING AS A RIDGE AXIS SHIFTS SLOWLY OVER THE REGION. BY DAYBREAK...THE RIDGE WILL MOVE EAST OF THE AREA...AND WINDS SHOULD BECOME PREDOMINANTLY SOUTHEAST...INCREASING IN SPEED THROUGH THE DAY. VFR VISIBILITIES AND CEILINGS ARE EXPECTED TO PERSIST THROUGH 00Z FRIDAY...BEFORE SCATTERED THUNDERSTORMS BECOME INCREASINGLY POSSIBLE AT ALL TAF SITES THURSDAY NIGHT INTO FRIDAY. /LAFLIN && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 452 AM CDT THU JUN 16 2011 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-171200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 452 AM CDT THU JUN 16 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP AND MOVE INTO SOUTH CENTRAL SOUTH DAKOTA THIS EVENING...THEN CONTINUE NORTHEAST ACROSS THE AREA OVERNIGHT. SOME OF THE STORMS NEAR THE MISSOURI RIVER VALLEY COULD BECOME SEVERE THIS EVENING...WITH HAIL TO THE SIZE OF HALF DOLLARS...AND WIND GUSTS TO 60 MPH THE PRIMARY THREATS SOUTHWEST OF A LINE FROM CHAMBERLAIN TO YANKTON SOUTH DAKOTA. FLOODING... RECORD HIGH RELEASES ARE OCCURRING FROM THE MISSOURI RIVER RESERVOIRS AND WILL CONTINUE INTO MID SUMMER. HIGH WATER LEVELS WILL CAUSE SIGNIFICANT IMPACTS BETWEEN CHAMBERLAIN AND SIOUX CITY. MANY PORTIONS OF THE JAMES RIVER VALLEY WILL SEE MINOR TO MODERATE FLOODING THROUGH THE WEEKEND DUE TO RECENT RAINFALL. IN ADDITION...HEAVY RAINS EARLIER THIS WEEK HAVE RESULTED IN MINOR FLOODING ALONG PORTIONS OF THE ROCK RIVER AND LITTLE SIOUX RIVERS IN NORTHWEST IOWA. LOWER PORTIONS OF THE BIG SIOUX RIVER ARE ALSO EXPECTED TO RISE ABOVE FLOOD STAGE BY THIS WEEKEND. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS THE AREA...ESPECIALLY NORTH OF INTERSTATE 90...FRIDAY MORNING. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. HOWEVER...A COLD FRONT MOVING ACROSS THE REGION COULD PRODUCE SOME SEVERE THUNDERSTORMS LATER IN THE DAY. THE GREATEST THREAT OF SEVERE WEATHER WILL MOVE ACROSS SOUTHEAST SOUTH DAKOTA LATE FRIDAY AFTERNOON...THEN SHIFT INTO SOUTHWEST MINNESOTA AND NORTHWEST IOWA FRIDAY EVENING. THUNDERSTORM CHANCES WILL INCREASE AGAIN EARLY NEXT WEEK. AT THIS TIME...WHILE TIMING AND LOCATION OF THUNDERSTORM DEVELOPMENT ARE UNCERTAIN...IT DOES APPEAR THAT SEVERE STORMS AND AREAS OF HEAVY RAIN WILL BE POSSIBLE AT SOME POINT IN THE MONDAY THROUGH TUESDAY TIME FRAME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 8 PM CDT...SOUTHWEST OF A LINE FROM CHAMBERLAIN TO YANKTON SOUTH DAKOTA. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy rain resulted in minor flooding of the Rock River, with flooding of some farmland along the river. The river crested at 1.9 feet above flood stage at Rock Rapids on June 23rd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2011Every state in 2011This day in weather historyWarnings in Iowa, June 2011
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: 328218.