Thunderstorms developed along a stationary front over southeast Minnesota during the evening of August 17th. These storms produced heavy rain that caused street flooding to occur in Rochester (Olmsted County) with the water reaching the bumpers on some vehicles.
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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 ARX wrote it up.
Thunderstorms developed along a stationary front over southeast Minnesota during the evening of August 17th. These storms produced heavy rain that caused street flooding to occur in Rochester (Olmsted County) with the water reaching the bumpers on some vehicles.
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 La Crosse, WI wrote its last area forecast discussion before the first event at Aug 17, 5:05 PM CST, 4 hours 47 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LA CROSSE WI 605 PM CDT SUN AUG 17 2014 .SHORT TERM...(TONIGHT THROUGH MONDAY NIGHT) ISSUED AT 230 PM CDT SUN AUG 17 2014 LATEST WATERVAPOR IMAGERY POINTED TO A SHORTWAVE TROUGH MOVING SLOWLY EAST ACROSS WESTERN MN...RESPONSIBLE FOR AN AREA OF SHOWERS/STORMS ACROSS MID/EASTERN SECTIONS OF THE GOPHER STATE. ANOTHER UPPER LEVEL SHORTWAVE TROUGH WAS SWINGING INTO THE NORTHERN PLAINS. THIS FIRST SYSTEM WILL CONTINUE TO MAKE SLOW PROGRESS EAST TONIGHT...GRADUALLY TRACKING INTO NORTHERN WI. MODELS SUGGEST THAT THIS FEATURE WILL WEAKEN AND/OR GET PULLED INTO THE NEXT SHORTWAVE...WHICH WILL TAKE A SPEEDIER PATH ACROSS THE UPPER MISSISSIPPI RIVER VALLEY ON MONDAY. 25 KT 850 MB JET WILL PROVIDE A PUSH OF LOW LEVEL MOISTURE FOR THE SYSTEM TO WORK ON MONDAY. ALTHOUGH WARM CLOUD DEPTHS AREN/T AS DEEP AS RECENT DAYS - ITS STILL FORECAST TO BE AROUND 3.5 KFT WITH PWS AROUND 1.6. SO...HEAVY RAIN STILL A GOOD BET WITH ANY OF THE STRONGER STORMS. MUCAPES BUILD IN EXCESS OF 2000 J/KG BY 00 TUE...WITH THE BULK OF THE SHEAR IN THE 0- 3KM LAYER NEAR 25 KTS. FAIRLY SKINNY CAPE PROFILES ACROSS THE FORECAST AREA FOR THE MOST PART - PER BUFKIT SOUNDINGS - ALTHOUGH A BIT MORE FAVORABLE FOR STORM DEVELOPMENT ACROSS NORTHEAST IA. OVERALL...DON/T SEE AN ORGANIZED SEVERE WEATHER THREAT AT THIS TIME. BELIEVE HEAVY RAIN AND A CHANCE FOR SMALL HAIL THE MORE LIKELY OUTCOMES. ON THE WHOLE...WILL HAVE SOME SCATTERED SHOWERS/STORMS INTO THE EVENING HOURS FOR SOUTHEAST MN...WITH CHANCES MOSTLY ALONG AND NORTH OF I-90 THROUGH THE OVERNIGHT. THE GREATER THREAT FOR RAIN WILL COME LATER IN THE DAY ON MONDAY...AND MOST LOCATIONS CAN EXPECT TO GET WET. .LONG TERM...(TUESDAY THROUGH SUNDAY) ISSUED AT 230 PM CDT SUN AUG 17 2014 DECENT AGREEMENT IN THE MODELS WITH THE OVERALL PATTERN FOR THE LATER PART OF THE NEW WEEK. THE GFS/ECMWF POINT TO A FAIRLY PROGRESSIVE PATTERN WITH SOME MINOR RIDGE BUILDING FRI. BOTH SLIDE AN UPPER LEVEL SHORTWAVE TROUGH ACROSS THE NORTHERN PLAINS WED...TRACKING NORTH OF THE REGION ON THU. AN ASSOCIATED SFC WARM FRONT WILL LIFT ACROSS THE UPPER MISSISSIPPI RIVER VALLEY...WITH FRONTOGENETIC LIFT AND WARM AIR ADVECTION ALONG IT LIKELY RESULTING IN A BAND OF SHOWERS/STORMS. ANOTHER SHORTWAVE TROUGH IS SLATTED TO MOVE OUT OF THE SOUTHERN ROCKIES AND TAKE AIM ON THE UPPER MISSISSIPPI RIVER VALLEY FRI/SAT. SOME DISAGREEMENTS BETWEEN THE MODELS ON TIMING/POSITIONING/STRENGTH...WITH THE GFS THE QUICKER OF THE TWO. OVERALL...BOTH SOLUTIONS POINT TO ANOTHER ROUND OF SHOWERS/STORMS. WILL SIDE WITH CONSENSUS FOR RAIN CHANCES FOR NOW. LOOKING AT A SLOW WARM UP THIS WEEK...WITH SOME MID-UPPER 80 DEGREE READINGS LIKELY BEFORE THE WORK WEEK IS DONE. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING) ISSUED AT 605 PM CDT SUN AUG 17 2014 THE FIRST CONCERN IN THE FORECAST IS WHETHER FOG AND LOW STRATUS WILL FORM AGAIN TONIGHT. A LIGHT SOUTHEAST FLOW IS IN PLACE ACROSS THE AREA AND IS EXPECTED TO CONTINUE THROUGH MUCH OF THE NIGHT WITH SPEEDS BETWEEN 5 AND 10 KNOTS. THIS SHOULD BE ENOUGH MIXING TO KEEP THE FOG THAT FORMS FROM BECOMING DENSE BUT MVFR AND SOME IFR CONDITIONS STILL POSSIBLE. MORE LIKELY WILL BE ANOTHER NIGHT WITH LOW STRATUS AND IFR CEILINGS AND WILL CONTINUE TO SHOW THESE CONDITIONS FOR BOTH SITES. CONDITIONS SHOULD BE SLOW TO IMPROVE MONDAY MORNING WITH THE WEAK FLOW AND HIGH MOISTURE LEVELS AND WILL KEEP THE LOW CEILINGS FOR MOST OF MONDAY MORNING. THE NEXT CONCERN IS WITH THE POTENTIAL FOR SHOWERS OVERNIGHT. SHORT WAVE TROUGH ACROSS THE DAKOTAS IS EXPECTED TO MOVE SLOWLY EAST TOWARD THE REGION WITH SOME SCATTERED SHOWERS AHEAD OF IT. BASED ON THE TIMING SHOWN BY MANY OF THE SHORT TERM MESO MODELS WILL PUSH THE TIMING OF THESE BACK TO ABOUT 10Z WITH A VCSH FOR BOTH SITES. THIS SHORT WAVE TROUGH WILL QUICKLY BE FOLLOWED BY ANOTHER FOR MONDAY AFTERNOON. WITH SOME HEATING...EXPECT CAPE VALUES TO BUILD TO BETWEEN 500 AND 1000 J/KG AND BASED ON THIS WILL SHOW VCTS FOR BOTH SITES DURING THE AFTERNOON WITH VFR CONDITIONS. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...NONE. MN...NONE. IA...NONE. && SHORT TERM...RIECK LONG TERM....RIECK AVIATION...04
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 911 AM CDT SUN AUG 17 2014 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ032-181415- MITCHELL-HOWARD-WINNESHIEK-ALLAMAKEE-FLOYD-CHICKASAW-FAYETTE- CLAYTON-WABASHA-DODGE-OLMSTED-WINONA-MOWER-FILLMORE-HOUSTON- BUFFALO- 911 AM CDT SUN AUG 17 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST IOWA...SOUTHEAST MINNESOTA...AND WEST CENTRAL WISCONSIN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE POSSIBLE FROM THIS AFTERNOON INTO TONIGHT. BRIEF HEAVY RAIN AND LIGHTNING WILL BE THE MAIN HAZARDS WITH THEM. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE FOR MUCH OF THE WEEK...WITH THE HIGHEST CHANCES MONDAY AFTERNOON AND EVENING. SEVERE WEATHER IS NOT ANTICIPATED WITH ANY STORMS THROUGH WEDNESDAY. AFTER WEDNESDAY IT IS TOO EARLY TO DISCERN THE SEVERE WEATHER POTENTIAL WITH THE STORMS. AREAS OF FOG ARE EXPECTED WEDNESDAY MORNING...WHICH COULD REDUCE VISIBILITIES TO AS LOW AS 1/4 MILE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH WEDNESDAY. .EMERGENCY MANAGEMENT COORDINATION... NO WEBINAR IS SCHEDULED. WIZ017-029-033-034-041>044-053>055-061-181415- TAYLOR-CLARK-TREMPEALEAU-JACKSON-LA CROSSE-MONROE-JUNEAU-ADAMS- VERNON-CRAWFORD-RICHLAND-GRANT- 911 AM CDT SUN AUG 17 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN WISCONSIN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE POSSIBLE TONIGHT. BRIEF HEAVY RAIN AND LIGHTNING WILL BE THE MAIN HAZARDS WITH THEM. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE FOR MUCH OF THE WEEK...WITH THE HIGHEST CHANCES MONDAY AFTERNOON AND EVENING. SEVERE WEATHER IS NOT ANTICIPATED WITH ANY STORMS THROUGH WEDNESDAY. AFTER WEDNESDAY IT IS TOO EARLY TO DISCERN THE SEVERE WEATHER POTENTIAL WITH THE STORMS. AREAS OF FOG ARE EXPECTED WEDNESDAY MORNING...WHICH COULD REDUCE VISIBILITIES TO AS LOW AS 1/4 MILE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH WEDNESDAY. .EMERGENCY MANAGEMENT COORDINATION... NO WEBINAR IS SCHEDULED. BOYNE
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Street flooding occurred on the northwest side of Rochester with the water reaching the bumpers on some vehicles.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2014Every state in 2014This day in weather historyWarnings in Minnesota, August 2014
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: 535188.