Runoff from heavy rain caused brief moderate flooding of Split Rock Creek in mid July.
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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.
Runoff from heavy rain caused brief moderate flooding of Split Rock Creek in mid July.
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 Jul 14, 2:15 AM CST, 3 hours 45 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 315 AM CDT THU JUL 14 2011 .DISCUSSION... SHORT WAVE MOVING THROUGH EASTERN SD AS OF 08Z WILL CONTINUE TO MOVE EAST OUT OF CWA. SCATTERED THUNDERSTORMS ASSOCIATED WITH THIS FEATURE WILL GENLERALLY BE EAST OF I29 BY 12Z AND WILL KEEP CHANCE IN THAT AREA THROUGH MID MORNING. THE OTHER ISSUE FOR TODAY IS THE WIDESPREAD STRATUS THAT IS DEVELOPING BEHIND THIS WAVE AS LOW LEVEL MOISTURE STREAMS NORTH UNDER INVERSION WEST OF WAVE. EXPECT EXTENSIVE CLOUD COVER MOST OF THE DAY ACROSS THE EAST WITH CLOUDS BREAKING UP IN THE AFTERNOON ACROSS THE WEST. THIS WILL HAVE AN IMPACT ON TEMPERATURES ACROSS THE CWA AND DID LOWER A FEW DEGREES. CAP BEGINS TO BUILD ACROSS CWA TONIGHT...AND IF WE CANT GET RID OF STRATUS...IT MAY REMAIN IN PLACE ALL NIGHT AND INTO PART FRIDAY. SOMETHING TO WATCH AS AGAIN THIS COULD HAVE AN EFFECT ON HIGHS ACROSS TH EAST. WAEK WAVE MOVES ACROSS NORTHERN AND WESTERN FRINGE OF CWA LATE THIS AFTERNOON AND TONIGHT AND COULD SEE A FEW STORMS DEVELOP ON EDEGE OF CAP MAINLY ALONG AND NORTH OF I90. SO WILL KEEP SMALL POPS IN. IF STORMS CAN DEVELOP...THEY COULD BECOME SEVERE ACROSS THE WEST LATE AFTERNOON OR EVENING WITH WIND THE MAIN THREAT. THE RAIN CHANCE IS VERY CONDITIONAL ON WHETHER CAP CAN BREAK. SURFACE FRONT WILL REMAIN LOCATED ACROSS NORTHERN CWA ON EDGE OF CAP SATURDAY...AND WITH HEATING DURING THE DAY...MAY BE ENOUGH TO BREAK CAP A BRING A CHANCE OF STORMS TO CWA MAINLY DURING THE NIGHT...WITH BEST CHANCE NORTH OF I90. AFTER THAT...RIDGE ALOFT BUILDS EVEN MORE WITH THREAT OF STORMS THEN SHIFTING OUT OF CWA SUNDAY INTO NEXT WEEK. HIGH TEMPERATURES ON FRIDAY WILL PROBABLY NOT MIX OUT AS WARM AS FORECAST ESPECIALLY WITH SUCH HIGH DEWPOINTS...BUT STILL VERY WARM AND HUMID WITH HIGHS IN THE UPPER 80S TO LOWER 90S. THE TEMPERATURES AND DEWPOINTS WILL PUSH HEAT INDICES NEAR ADVISORY LEVEL FRIDAY AFTERNOON ACROSS THE SOUTH...WITH HEAT ADVISORY CRITERIA BEING MET ACROSS ALL OF THE CWA SATURDAY THROUGH AT LEAST TUESDAY OR WEDNESDAY OF NEXT WEEK. LOOKS LIKE ONE OF THE HOTTER STRETCH OF DAYS IN THE LAST FEW YEARS. EVEN BEYOND EARLY NEXT WEEK...IT MAY REMAIN HOT AND HUMID AT LEAST THROUGH NEXT WEEKEND IF GFS IS CORRECT. HOWEVER...ECMWF IS SHOWING THE RIDGE BREAKING DOWN BY NEXT WEEKEND WITH SUBSTANTIALLY COOLER TEMPERATURES. BUT AT LEAST THROUGH WEDNESDAY IT LOOKS HOT ON ALL THE MODELS. FINALLY...DEWPOINTS WILL REALLY INCREASE TODAY AND WILL GENERALLY BE IN THE 70S ACROSS THE CWA BY MID TO LATE AFTERNOON AND PERSIST THROUGH AT LEAST MID WEEK. SO THIS WILL MAKE THE HEAT DANGEROUS. && .AVIATION... EARLY MORNING CONVECTION EXPECTED TO TRACK TO THE NORTH AND EAST...AND DIMINISH ACROSS THE AREA BY 15Z. MORNING MVFR CEILINGS...TO LOCALIZED IFR CEILINGS...WILL IMPROVE INTO THE VFR RANGE BY 18Z. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 350 AM CDT THU JUL 14 2011 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-151200- 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- 350 AM CDT THU JUL 14 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THERE IS A CHANCE OF THUNDERSTORMS MAINLY EAST OF INTERSTATE 29 THROUGH MID MORNING. THESE STORMS WILL NOT BE SEVERE. THERE IS A CHANCE THAT A FEW THUNDERSTORMS COULD REDEVELOP LATE THIS AFTERNOON WEST OF THE JAMES VALLEY AND THEN SPREAD EAST OVERNIGHT ALONG AND NORTH OF INTERSTATE 90. IF THESE STORMS CAN DEVELOP...THEY MAY BE SEVERE WEST OF THE JAMES VALLEY WITH WIND GUSTS TO 60 MPH THE MAIN THREAT. FLOODING... MINOR CRESTS ARE EXPECTED ALONG TO BIG SIOUX AND LITTLE SIOUX RIVER BASINS OVER THE NEXT FEW DAYS DUE TO RECENT HEAVY RAINS. RECORD HIGH RELEASES ALONG THE MISSOURI RIVER WILL CONTINUE INTO LATE SUMMER. HIGH WATER LEVELS WILL CAUSE SIGNIFICANT IMPACTS BETWEEN CHAMBERLAIN AND SIOUX CITY. ADDITIONALLY...THE JAMES RIVER WILL BE IN FLOOD UNTIL FURTHER NOTICE...ALONG WITH LOWER PORTIONS OF THE BIG SIOUX NEAR SIOUX CITY DUE TO BACKWATER EFFECTS FROM THE MISSOURI RIVER. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THERE IS A CHANCE OF THUNDERSTORMS MAINLY FRIDAY NIGHT ACROSS THE REGION. IF THESE STORMS CAN DEVELOP...A FEW MAY BECOME SEVERE. DANGEROUS HEAT INDICES OF 100 TO 105 DEGREES CAN BE EXPECTED FRIDAY AFTERNOON AND EVENING...AND IN THE 100 TO 110 DEGREE RANGE SATURDAY AFTERNOON AND EVENING. DANGEROUS HEAT INDICES OF 105 TO 110 DEGREES WILL PERSIST DURING THE AFTERNOON AND EVENING HOURS SUNDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 6 PM WEST OF THE JAMES VALLEY. && 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.
2 flood. Local standard time, as filed.
Heavy rain caused Split Rock Creek to flood, with lowlands along the creek and a few county roads affected. The creek crested at 4.2 feet above flood stage near Jasper on July 14th.
Heavy rain caused Split Rock Creek to flood, with lowlands along the creek and a few county roads affected. The creek crested at 4.2 feet above flood stage near Jasper on July 14th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2011Every state in 2011This day in weather historyWarnings in Minnesota, July 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: 336489, 336490.