A strong complex of thunderstorms moved across southern South Dakota during the evening of June 19th, and into the early morning hours of June 20th. Although the majority of these storms stayed in South Dakota, the southern edge of the squall line moved across Knox County in northeast Nebraska producing strong winds.
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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 OAX wrote it up.
A strong complex of thunderstorms moved across southern South Dakota during the evening of June 19th, and into the early morning hours of June 20th. Although the majority of these storms stayed in South Dakota, the southern edge of the squall line moved across Knox County in northeast Nebraska producing strong winds.
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 Omaha, NE wrote its last area forecast discussion before the first event at Jun 19, 10:47 PM CST, 2 hours 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1147 PM CDT FRI JUN 19 2015 .SHORT TERM...(TONIGHT THROUGH MONDAY) ISSUED AT 310 PM CDT FRI JUN 19 2015 CLEAR SKIES AND FAIR WEATHER ARE DOMINATING TODAY. SUBJECTIVE 12Z UPPER AIR ANALYSIS INDICATES REMNANTS OF BEN CENTERED ALONG THE AR/MO BORDER...EMBEDDED IN OTHERWISE ZONAL FLOW ACROSS THE NORTHERN HALF OF THE CONUS AND WEAK FLOW IN THE SOUTHERN HALF. MOISTURE AT 850MB HAD BEEN SHUNTED EASTWARD AROUND THE REMNANTS...WITH AN AXIS EXTENDING BACK INTO KS. IN THE WAKE OF THAT REMNANT LOW...RETURN FLOW WAS NOTED IN THE HIGH PLAINS. SURFACE RIDGE AXIS AT 19Z EXTENDED FROM NORTHERN MI THROUGH CENTRAL IA/NORTHWEST MO/EASTERN KS. MAIN FORECAST CONCERN IS POSSIBLE MCS CLIPPING THE NORTHERN/NORTHEASTERN CWA TONIGHT...AND BRIEF HOT TEMPERATURES TOMORROW. CONVECTION-ALLOWING SHORT-TERM MODELS ARE COMING IN FURTHER SOUTH AND MORE AGGRESSIVE WITH MCS DEVELOPMENT IN SD TONIGHT...WITH PRECIP REACHING NORTHEAST NEB 06-09Z AND SKIRTING NORTHWEST IOWA 09-15Z. HAVE INCREASED POPS IN THOSE NORTHERN TO NORTHEASTERN FRINGES FROM LATE TONIGHT INTO SATURDAY MORNING. SYSTEM SHOULD CLEAR OUT QUICKLY...AND WITH STRONG WARM/MOIST AIR ADVECTION...TOMORROW WILL LIKELY HAVE THE HIGHEST HEAT INDICES OF THE YEAR SO FAR. SOUTHERN CWA IS JUST SHY OF HEAT ADVISORY CRITERIA...AND HAVE NOT ISSUED AN ADVISORY...BUT HEAT INDICES AROUND 100-105F ARE POSSIBLE FOR A COUPLE OF HOURS IN THE AFTERNOON. WEAK FRONT ASSOCIATED WITH AN UPPER-LEVEL SHORTWAVE IS PROGGED TO SLIDE THROUGH THE CWA DURING THE DAY...AND THINK INSTABILITY WILL BE ENOUGH FOR AT LEAST A COUPLE OF ISOLATED SHOWERS/THUNDERSTORMS TO DEVELOP IN THE LATE AFTERNOON. HAVE LIMITED MENTION TO SOUTHWEST IOWA FOR NOW...AS REST OF CWA MAY REMAIN TOO CAPPED. SURFACE RIDE SLIDES THROUGH ON SATURDAY NIGHT INTO SUNDAY. CONVECTIVE DEVELOPMENT ON THE HIGH PLAINS SATURDAY NIGHT MAY REACH CENTRAL NEB...BUT THINK IT WILL STRUGGLE TO REACH EASTERN NEB UNDER THE SURFACE/MID-LEVEL RIDGE. A FEW SHOWERS AND THUNDERSTORMS MAY DEVELOP ON SUNDAY BY AROUND MIDDAY SOMEWHERE IN AN AXIS FROM SOUTHEAST TO CENTRAL NEB...SLIDING SOUTHEAST THROUGH THE DAY. ONCE AGAIN...MCS DEVELOPMENT SEEMS POSSIBLE ON SUNDAY NIGHT...WITH A HIGHER LIKELIHOOD THAT IT REACHES AT LEAST THE NORTHERN HALF OF THE CWA ON LATE SUNDAY NIGHT INTO MONDAY MORNING. IN ITS WAKE...THINK MONDAY WILL BE STABILIZED AND DRY. .LONG TERM...(MONDAY NIGHT THROUGH FRIDAY) ISSUED AT 310 PM CDT FRI JUN 19 2015 FOR THE WORK WEEK...700MB TEMPERATURES CLIMB TO THE MID-TEENS BY MONDAY NIGHT/TUESDAY...CONTINUING THROUGH WEDNESDAY/WEDNESDAY NIGHT. COMBINED WITH RISING 500MB HEIGHTS...THAT SHOULD QUELL CONVECTIVE DEVELOPMENT PARTICULARLY DURING THE DAY. HAVE INCREASED HIGHS ABOVE BLENDS AND REMOVED BLEND POPS DURING THE DAYTIMES. WITH A BOUNDARY SAGGING INTO THE CWA ON TUESDAY NIGHT...CANNOT RULE OUT A STRAY ISOLATED ELEVATED NOCTURNAL SHOWER OR THUNDERSTORM...ESPECIALLY IN THE NORTHERN CWA CLOSE TO THE BOUNDARY. CAP IS PROGGED TO WEAKEN THURSDAY...ALLOWING CHANCES OF SHOWERS AND THUNDERSTORMS TO START TO RETURN ON THURSDAY/FRIDAY DEPENDING ON EVOLUTION OF WEAK FEATURES. && .AVIATION...(06Z TAFS FOR KOFK...KLNK AND KOMA.) ISSUED AT 1144 PM CDT FRI JUN 19 2015 VFR CONDITIONS ARE FORECAST THROUGH THE TAF PERIOD. LINE OF THUNDERSTORMS MOVING INTO CENTRAL SOUTH DAKOTA COULD ROLL INTO NORTHEAST NEBRASKA BETWEEN 09Z AND 12Z...BUT SHOULD STAY NORTH OF KOFK. HOWEVER THERE IS A SMALL CHANCE MVFR CIGS/VSBYS COULD AFFECT KOFK BRIEFLY. OTHERWISE SOUTH TO SOUTHEAST WINDS 15 TO 25KT WILL CONTINUE OVERNIGHT UNTIL A COOL FRONT SLIPS INTO EASTERN NEBRASKA BETWEEN 15Z AND 21Z...TURNING WINDS TO THE NORTHWEST AT ALL TAF SITES. LOW LEVEL WIND SHEAR IS ALSO EXPECTED THROUGH 14Z WITH 50KT SOUTHWEST WINDS NEAR FL015-FL020 OVERRIDING SOUTHEAST SURFACE FLOW. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && SHORT TERM...MAYES LONG TERM...MAYES AVIATION...DERGAN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 450 PM CDT FRI JUN 19 2015 IAZ069-079-080-090-091-NEZ030-042>045-050>053-065>068-078-088>093- 201200- POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-PAGE-BOONE-PLATTE-COLFAX- DODGE-WASHINGTON-BUTLER-SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER- CASS-OTOE-SALINE-JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON- 450 PM CDT FRI JUN 19 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND SATURDAY ISOLATED AFTERNOON THUNDERSTORMS ON SATURDAY ARE POSSIBLE OVER SOUTHWEST IOWA. HEAT INDICES ARE EXPECTED TO PUSH INTO THE 100 TO 105 DEGREE RANGE SATURDAY AFTERNOON OVER EAST-CENTRAL AND SOUTHEAST NEBRASKA...AS WELL AS SOUTHWEST IOWA. .DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH THURSDAY SMALL THUNDERSTORM CHANCES ARE ON TAP OVER THE MAJORITY OF THE OUTLOOK AREA DURING THE FORECAST PERIOD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE THROUGH SATURDAY. IAZ043-055-056-NEZ011-012-015>018-031>034-201200- MONONA-HARRISON-SHELBY-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE- MADISON-STANTON-CUMING-BURT- 450 PM CDT FRI JUN 19 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA AND NORTHEAST NEBRASKA. .DAY ONE...TONIGHT AND SATURDAY ISOLATED THUNDERSTORMS ARE POSSIBLE AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN...SATURDAY NIGHT THROUGH THURSDAY SMALL THUNDERSTORM CHANCES ARE ON TAP OVER THE MAJORITY OF THE OUTLOOK AREA DURING THE FORECAST PERIOD. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH SATURDAY.
The Sioux Falls radar (KFSD), 147 km away, was scanning. The volume nearest the first event began at 07:43 UTC.
2 thunderstorm wind. Local standard time, as filed.
Trees were downed along State Highway 12 and near the town of Verdel on some county roads.
A few large tree limbs down and some shingle damage to roofs were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2015Every state in 2015This day in weather historyWarnings in Nebraska, June 2015
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: 573133, 573130.