Thunderstorms produced a weak tornado near the town of Mayfield in Yankton County on the late afternoon and early evening of August 28th. The path of the tornado was over open country.
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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.
Thunderstorms produced a weak tornado near the town of Mayfield in Yankton County on the late afternoon and early evening of August 28th. The path of the tornado was over open country.
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 Aug 28, 2:36 PM CST, 3 hours 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 336 PM CDT THU AUG 28 2014 .SHORT TERM...(THIS EVENING THROUGH FRIDAY) ISSUED AT 335 PM CDT THU AUG 28 2014 MAIN CONCERN ARE CONTINUED RAIN CHANCES AS THE UPPER LOW CONTINUES TO SLOWLY MOVE EAST. A STRONG DRY SLOT MOVED THROUGH MOST OF EASTERN SD...WESTERN IOWA AND SOUTHWEST MN LATE THIS MORNING. WITH SOME HEATING OVER ERN NEBRASKA...THERE IS SOME WEAK INSTABILITY DEVELOPING SUCH THAT SCATTERED SHOWERS MAY DEVELOP DURING THE EVENING EAST OF VERMILLION TO MML LINE. ANOTHER AREA OF THUNDERSTORMS HAVE BEEN DEVELOPING THIS AFTERNOON WEST OF THE JAMES RIVER. EXPECT THAT STORMS WILL CONTINUE TO DEVELOP THROUGH THE EVENING. THERE HAS BEEN A LITTLE MORE HEATING AND THE PROXIMITY OF THE UPPER LEVEL WAVE SHOULD HELP ENHANCE THE ASCENT AND DEVELOPMENT THROUGH 00Z OR SO. HOWEVER...AS THE SUNSET...INSTABILITY WILL DECREASE AND SHOULD RESULT IN A GRADUAL DECREASE IN SHOWERS AND STORMS...ALTHOUGH CANNOT RULE A STORM TOWARD I29 THROUGH THE NIGHT AS THE UPPER LOW CONTINUES EAST. THE OTHER CONCERN TONIGHT IS FOG POTENTIAL. WINDS WILL BE LIGHT OVER THE JAMES AND MISSOURI VALLEY LATER TONIGHT AS THE SFC TROUGH SLOWLY MOVES TO THE EAST. WITH RAIN EARLIER TODAY...THIS SETS UP A HIGH POTENTIAL FOR FOG AFTER MIDNIGHT AND INTO FRIDAY MORNING. WITH A SLOW INCREASE IN NW FLOW TOMORROW MORNING AS THE TROUGH MOVES TOWARD I29...HAVE THE FOG DISSIPATE BY MID MORNING. WITH THE FLOW CONTINUING TO BE WEAK...THIS FOG COULD PERSIST LATER INTO THE NIGHT. THE OTHER EFFECT OF THE LOW LEVEL MOISTURE IS THAT LOWS WILL BE WARMER TONIGHT FROM THE LOWER 60S AROUND KHON TO THE UPPER 60S AROUND KSUX. THE UPPER LOW WILL SLOWLY MOVE EAST THROUGH FRIDAY MORNING... REACHING ERN NEBRASKA AROUND 18Z. WITH THE STRONG FORCING FOR ASCENT COMBINED WITH LOW LEVEL INSTABILITY...EXPECT THAT SHOWERS WILL BEGIN TO DEVELOP BY LATE MORNIGN NEAR THE MISSOURI RIVER AND SPREAD NORTHEAST THROUGH THE AFTERNOON. WITH THE SLOWER MOVEMENT OF THE UPPER LOW HAVE RAISED PRECIPITATION CHANCES OVER MOST SW MN AND NW IA...WITH AREAS FROM SUX TO MJQ HAVING THE GREATEST CHANCE FOR RAIN. IN GENERAL...EXPECTING FROM A TENTH TO HALF INCH OF RAIN IN THIS AREA...WITH LESS TO NORTHWEST...BUT COULD SEE LOCAL AMOUNTS UP TO AN INCH WITH STRONGER STORMS. FARTHER WEST...SKIES SHOULD CLEAR THROUGH THE DAY. WITH THE LACK OF COLD ADVECTION...TEMPERATURES SHOULD RISE INTO THE 80S...WITH MID 80S WEST OF THE JAMES RIVER. WITH MORE CLOUDS AND PRECIPITATION...IT WILL REMAIN IN THE MID TO UPPER 70S EAST OF THE JAMES RIVER. .LONG TERM...(FRIDAY NIGHT THROUGH THURSDAY) ISSUED AT 335 PM CDT THU AUG 28 2014 LINGERING TSRA ARE EXPECTED ON FRIDAY NIGHT AS THE TROUGH AND ASSOCIATED SFC FRONT CONTINUES TO MOVE THROUGH THE CWA. AFTER FROPA...SKIES WILL CLEAR SOME ALLOWING FOR TEMPS TO WARM BACK INTO THE LOWER 80S. SUNDAY STILL LOOKS LIKE A POTENTIAL SEVERE WX DAY. LLVL JET IS AROUND 40-45KTS ADVECTING A STRONG THERMAL GRADIENT INTO SE SOUTH DAKOTA. DECENT AMT OF SHEAR IS ALSO PRESENT ESPECIALLY IN THE AFTERNOON. LIMITING FACTOR WILL BE SKY COVER WHICH WILL LIMIT THE AMT OF INSOLATION TO CORRESPOND WITH BETTER SVR PARAMETERS AS WELL AS SOMEWHAT OF A CAP. EITHER WAY...STRENGTH OF APPROACHING WAVE AND RESULTANT SFC FRONT MAY BE ABLE TO OVERCOME THIS...ESPECIALLY LATER IN THE EVENING HOURS. THE FRONT SHOULD CLEAR THE CWA BY MONDAY MORNING. ZONAL FLOW SETS UP FOR MON NIGHT INTO TUES WITH A WEAK WAVEQUICKLY PASSING THROUGH ON MONDAY NIGHT BRINGING A LOW CHANCE OF TSRA. FOR TUES THROUGH THURS...ONLY CHANCE OF TSRA DURING THIS PD IS IN SOUTHWEST MN ON TUES NIGHT AND MOST OF THE CWA ON WED NIGHT AS YET ANOTHER FEW WEAK WAVES PASS THROUGH BRINGING A LOW CHANCE OF TSRA. TEMPS THROUGH THE PD ARE EXPECTED TO BE AT OR SLIGHTLY BELOW NORMAL FOR THIS TIME OF YEAR. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY MORNING) ISSUED AT 315 PM CDT THU AUG 28 2014 SEVERAL ISSUES WITH TAFS NEXT 24 H. THE FIRST ISSUE IS THE LOW CLODUS AROUND THE AREA TODAY. CIGS HAVE GRADUALLY BEEN RISING ACROSS EASTERN NEBRASKA. AS STRATOCU FORMS...MVFR TO MVFR CIGS HAVE PREDOMINATE. HOWEVER...AS THE SUNSETS EXPECT CIGS TO RISE BRIEFLY TO MVF AT KSUX AND KFSD. THAT SHOULD ALSO OCCUR A LITTLE LATER AT KHON...LIKELY TO 03Z. HOWEVER...WITH AMPLE LOW LEVEL MOISTURE EXPECT FOG TO FORM LATE TONIGHT. AT THIS POINT...HAVE NOT FAVORED ANY ONE TAF WITH LOWER VSBYS BUT THE MOST LIKELY AREA FOR VSBYS LESS THAN 1SM AND CIGS BELOW 500 FT IS KHON WHERE WINDS WILL BE NEARLY CALM MUCH OF THE NIGHT. THIS FOG WILL VERY SLOWLY BURN OFF DURING THE MORNING. EXPECTATION IS THAT THIS WILL BE TOWARD 15Z AROUND KHON ALTHOUGH IF SURFACE TROUGH MOVES MORE SLOWLY THAN EXPECTED AND NW WINDS REMAIN LIGHT...FOG COULD LINGER THROUGH 15Z. FARTHER EAST...SHOWERS AND THUNDERSTOMRS MAY DEVELOP AFTER 15Z...ESPECIALLY AROUND KHON WHICH WILL LIKELY RESULT IN IFR CEILINGS. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...SCHUMACHER LONG TERM...SALLY AVIATION...SCHUMACHER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 652 AM CDT THU AUG 28 2014 SDZ038>040-050-052>055-057>061-063>066-068-069-291200- BEADLE-KINGSBURY-BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE- BRULE-AURORA-DAVISON-HANSON-MCCOOK-CHARLES MIX-DOUGLAS-HUTCHINSON- TURNER-BON HOMME-YANKTON- 652 AM CDT THU AUG 28 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL SOUTH DAKOTA...SOUTH CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY HAZARDOUS WEATHER IS NOT EXPECTED FROM FRIDAY THROUGH SUNDAY MORNING. HOWEVER...THUNDERSTORMS DEVELOPING ON SUNDAY COULD BE MARGINALLY SEVERE WITH LOCALLY HEAVY RAINFALL ON SUNDAY AFTERNOON FROM THE JAMES VALLEY EASTWARD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. IAZ001>003-012-MNZ071-072-080-081-089-090-097-098-NEZ013-SDZ056- 062-067-070-071-291200- LYON-OSCEOLA-DICKINSON-SIOUX-LINCOLN-MURRAY-COTTONWOOD-NOBLES- JACKSON-PIPESTONE-ROCK-DIXON-MOODY-MINNEHAHA-CLAY-UNION- 652 AM CDT THU AUG 28 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA...SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA...EAST CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT SPOTTY HEAVY RAINFALL IS POSSIBLE TODAY FOR PARTS OF SOUTHWEST MINNESOTA...THROUGH EXTREME NORTHWEST IOWA AND SOUTHEAST SOUTH DAKOTA...WHERE AN INCH TO AN INCH AND A HALF OF RAINFALL WILL BE POSSIBLE THROUGH TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY HAZARDOUS WEATHER IS NOT EXPECTED ON FRIDAY THROUGH SUNDAY MORNING. THUNDERSTORMS DEVELOPING ON SUNDAY MAY BRING A SEVERE THREAT DURING THE AFTERNOON AND EVENING HOURS...CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WIND...AND EVEN AN ISOLATED TORNADO. LOCALLY HEAVY RAINFALL OF ONE TO TWO INCHES IS POSSIBLE SUNDAY AFTERNOON AND SUNDAY EVENING...WHICH COULD RESULT IN FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. IAZ013-014-020>022-031-032-NEZ014-291200- O'BRIEN-CLAY-PLYMOUTH-CHEROKEE-BUENA VISTA-WOODBURY-IDA-DAKOTA- 652 AM CDT THU AUG 28 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THE MAIN THREAT WITH SHOWERS AND SCATTERED THUNDERSTORMS TODAY WILL BE HEAVY RAIN...ESPECIALLY ALONG AND SOUTHEAST OF A SIOUX CITY IOWA TO JACKSON MINNESOTA LINE. A WIDESPREAD INCH TO INCH AND A HALF RAINFALL IS LIKELY...WITH LOCALIZED AMOUNTS OF UP TO 2 INCHES. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS LATE MORNING THROUGH THE AFTERNOON ON FRIDAY WILL AGAIN BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL...MAINLY SOUTHEAST OF A SPENCER TO SIOUX CITY LINE. WHILE A MORE LIKELY RAINFALL WILL AVERAGE A THIRD TO TWO THIRDS OF AN INCH...A FEW LOCATIONS COULD RECEIVE A QUICK INCH OF RAINFALL. HAZARDOUS WEATHER IS NOT EXPECTED FRIDAY NIGHT THROUGH SUNDAY MORNING. THUNDERSTORMS DEVELOPING ON SUNDAY MAY BRING A SEVERE THREAT DURING THE AFTERNOON AND EVENING HOURS...CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WIND...AND EVEN AN ISOLATED TORNADO. LOCALLY HEAVY RAINFALL OF ONE TO TWO INCHES IS POSSIBLE SUNDAY AFTERNOON AND SUNDAY EVENING...WHICH COULD RESULT IN FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.
The Sioux Falls radar (KFSD), 81 km away, was scanning. The volume nearest the first event began at 23:42 UTC.
1 tornado. Local standard time, as filed.
A tornado was observed crossing open country.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2014Every state in 2014This day in weather historyThe tornado archive for South Dakota, 2014Warnings in South Dakota, 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: 532898.