Heavy rain caused minor flooding of the Rock River near Hardwick Minnesota on May 7th.
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The episode as NWS FSD wrote it up.
Heavy rain caused minor flooding of the Rock River near Hardwick Minnesota on May 7th.
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 May 6, 9:40 PM CST, 4 hours 20 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 1040 PM CDT SUN MAY 6 2012 .DISCUSSION.../ISSUED AT 824 PM CDT/ MAIN AREA OF SHOWERS ABOUT OUT OF THE CWA AS OF 01Z...BUT EXTREME SOUTHEAST COULD STILL BE SCRAPED BY ADDITIONAL LIGHT ACTIVITY THROUGH ABOUT 03Z. HAVE MADE SOME MINOR TWEAKS TO COVER THIS...AS WELL AS SKY COVER AND EVENING TEMPS. OVERALL TREND OF THE FORECAST IN GOOD SHAPE THOUGH AND NO UPDATES TO ZFP PLANNED AT THIS TIME. UPDATED GRIDS/PFM HAVE BEEN SENT. && .AVIATION.../FOR THE 06Z TAF ISSUANCE/ VFR SHOULD CONTINUE THROUGH 08/06Z WITH NO CEILINGS OR VISIBILITY RESTRICTIONS. INFLUX OF STEADILY DRIER LOW LEVEL AIR WILL PREVENT EVEN MINIMAL EARLY MORNING FOG. ANY APPROACH OF LOWERING CEILINGS FROM THE NORTH SHOULD BE WELL AFTER FORECAST PERIOD. A FEW SURFACE GUSTS AROUND 25 KNOTS FROM THE NORTHWEST 15Z-22Z. && .PREV DISCUSSION.../ISSUED AT 343 PM CDT/ LOW AND MID LEVEL CLOUDS BLANKETING THE FORECAST AREA WILL CONTINUE TO LIFT AND SHIFT EASTWARD THROUGH THIS EVENING. CLEARING SKIES ARE EXPECTED OVERNIGHT BEHIND A MID LEVEL FRONT WHICH SWEEPS THROUGH THE FORECAST AREA THIS EVENING AND EARLY OVERNIGHT. COULD SEE SOME ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS TRACK NORTHEASTWARD NEAR THE QUASI STATIONARY SURFACE BOUNDARY ACROSS OUR EXTREME SOUTHEAST COUNTIES IN NORTHWEST IOWA. ANY STORMS THAT DO MOVE THROUGH THE AREA SHOULD QUICKLY DIMINISH AROUND SUNSET. OTHERWISE...CLEARING SKIES AND WEST TO NORTHWEST WINDS WILL RESULT IN COOLER LOWS TONIGHT MAINLY IN THE 40S. SURFACE HIGH PRESSURE WILL BEGIN SLIDING SOUTHWARD INTO THE NORTHERN HIGH PLAINS ON MONDAY WHILE THE MID LEVEL LOW SLOWLY SAGS INTO NORTH DAKOTA. WITH A FAIRLY TIGHT GRADIENT AND COLD AIR ADVECTING INTO THE PLAINS...NORTHWEST WINDS WILL BECOME BREEZY DURING THE DAY AROUND 15 TO 30 MPH BUT SHOULD REMAIN BELOW ADVISORY LEVEL. SKIES WILL BE MOSTLY SUNNY TO PARTLY CLOUDY WITH HIGHS IN THE 60S. / UPPER LEVEL LOW WILL TURN THE CORNER...AND DROP SOUTHEAST ACROSS MINNESOTA AND THE GREAT LAKES LATER MONDAY NIGHT AND TUESDAY. VERY COLD TEMPERATURES ALOFT SHOULD RESULT IN DEVELOPMENT/EXPANSION OF CUMULUS FIELD DURING THE DAY ON TUESDAY. EVEN GIVEN THE MID TO UPPER 30S DEWPOINTS...WOULD BE ENOUGH TO GET SOME 100 OR SO SHORT CAPE... SCATTERED SHOWERS WITH MORE CERTAINTY...AND LIKELY EVEN SOME ISOLATED AFTERNOON DIURNAL THUNDER...FAVORING THE NORTHEAST HALF OF THE AREA OVER THE SOUTHWEST. PRECIP SHOULD LINGER SOMEWHAT IN THE FAR EAST INTO THE EVENING BEFORE CLOUDS GRADUALLY FLATTEN/DISSIPATE. COOLEST MORNING ON WEDNESDAY UNDER SURFACE RIDGE...AND SHOULD BE A FABULOUS IF NOT SOMEWHAT COOL DAY WITH WINDS ON THE LIGHT SIDE. FOR THE EXTENDED RANGE /THURSDAY THROUGH SUNDAY/ A BIT BETTER THAN AVERAGE CONSISTENCY IN MODEL SOLUTIONS LENDS A BIT MORE CONFIDENCE THAN MOST OF LATE. PERIOD BEGINS WITH STRONG RIDGING ACROSS THE AREA...BUT STRONG PRESSURE FALLS IN THE WESTERN PLAINS WILL INCREASE SOUTHERLY WINDS AND LEAD TO MODERATION IN TEMPERATURES TO HIGHS IN THE 70S UNDER MOSTLY SUNNY SKIES. STRONG FRONTAL ZONE WILL SETTLE INTO THE WESTERN PLAINS...AND WORK EASTWARD DURING THE NIGHT. STRONG ELEVATED MIXED LAYER PUSH AHEAD OF TROUGH WILL INCREASE POTENTIAL INSTABILITY...BUT MOISTURE WILL BE SOMEWHAT CHALLENGED UNTIL SHARPER TROUGH AND DEEP FRONTAL ZONE APPROACH...SO DID TIME THE THREAT FOR PRECIPITATION MAINLY INTO THE LATER NIGHT HOURS WITH BULK OF LIFT LOOKING TO OCCUR SLOPING BACK INTO THE COLDER AIR ALOFT...WITH EXCEPTION OF SOME ROGUE HIGH BASED ACTIVITY IN THE FAR NORTHEAST IN THE EVENING. WITH VERY STRONG FRONTAL DYNAMICS...DID RAISE POPS SLIGHTLY FROM GUIDANCE...INCREASING TO MID CHANCE RANGE DURING FRIDAY IN THE EAST. ALSO MADE SOME SUBTLE CHANGES TO MAX TEMPS ON FRIDAY TO REFLECT COOLER CONDITIONS IMMEDIATELY POST FRONTAL...AS CLOUDS/PRECIP LIKELY TO IMPACT MIXING. PRECIP LINGERS IN THE FAR SOUTHEAST FRIDAY NIGHT AS TAIL OF DIV Q IN RIGHT ENTRANCE. DRYING AT LOW LEVELS FRIDAY NIGHT INTO SATURDAY AS SURFACE RIDGE SETTLES ACROSS THE AREA...WITH SEASONALLY COOL LOWER LEVELS...AND COOL ENOUGH MID LEVELS THAT COULD HAVE TO DEAL WITH A FEW ROGUE DIURNALLY DRIVEN SHOWERS...ESPECIALLY IF THE WAVE FALLS IN A BIT FARTHER WESTWARD PER GFS ON SUNDAY. FOR NOW...HAVE SIDED DRY. /CHAPMAN && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 453 AM CDT SUN MAY 06 2012 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-071200- 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- 453 AM CDT SUN MAY 06 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... A FEW THUNDERSTORMS ARE POSSIBLE EARLY THIS AFTERNOON ACROSS PORTIONS OF NORTHWEST IOWA. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. FLOODING... DUE TO THE RECENT HEAVY RAINFALL...FLOODING OF SOME AREA RIVERS AND STREAMS IS LIKELY OVER THE NEXT COUPLE OF DAYS. THE BIG SIOUX RIVER IS EXPECTED TO FLOOD FROM BROOKINGS TO AKRON IOWA. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && 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 caused minor lowland flooding along the Rock River near Hardwick. The river crested at 1.02 feet above flood stage on May 7th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2012Every state in 2012This day in weather historyWarnings in Minnesota, May 2012
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: 384512.