In the early morning of Thursday June 21st, Severe Thunderstorm Watch 431 was issued for ongoing thunderstorms, and in anticipation of severe thunderstorms continuing along and north of a stalled frontal boundary over northern South Dakota, and in association with an upper level short wave approaching North Dakota. Numerous severe thunderstorm warnings were issued.
Every event with a place to put it. Tap one for its entry below.
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 BIS wrote it up.
In the early morning of Thursday June 21st, Severe Thunderstorm Watch 431 was issued for ongoing thunderstorms, and in anticipation of severe thunderstorms continuing along and north of a stalled frontal boundary over northern South Dakota, and in association with an upper level short wave approaching North Dakota. Numerous severe thunderstorm warnings were issued. Five reports of large hail were received during the early morning through the mid morning hours.
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 Bismarck, ND wrote its last area forecast discussion before the first event at Jun 20, 12:15 PM MST, 12 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BISMARCK ND 215 PM CDT WED JUN 20 2007 .SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT A SLOW MOVING PROGRESSIVE RIDGE WILL CRAWL ACROSS THE NORTHERN PLAINS DURING THE SHORT TERM FORECAST PERIOD. AT THE SURFACE...LOW LEVEL MOISTURE WILL BE SURGING NORTHWARD AND A LOW LEVEL NOCTURNAL JET WILL DEVELOP EACH NIGHT. THIS BASICALLY ADDS UP TO EVENING AND NIGHTTIME THUNDERSTORMS...WHICH WILL LIKELY DEVELOP INTO ONE OR TWO MCS EACH NIGHT. LOCATIONS WILL DEPEND ON THE POSITION OF A QUASI STATIONARY FRONT WHICH WILL LAY IN AN EAST/WEST ORIENTATION. LATER IN THE FORECAST PERIOD CAPPING MAY BECOME A LIMITING FACTOR IN SOME PARTS OF THE REGION. TEMPERATURES AND DEW POINTS WILL BE ON THE RISE THROUGH THE PERIOD AND BY SATURDAY IT SHOULD BE QUITE MUGGY. .LONG TERM...HOT/HUMID AIR STILL SLATED THROUGH SUNDAY...THEN RELIEF ARRIVES MONDAY THROUGH WEDNESDAY WITH LOWER HUMIDITY. 12Z GFS SLOWS THE FRONTAL PASSAGE SUNDAY OVER BISMARCK NEAR MIDNIGHT...WHEREAS THE PREVIOUS RUNS HAD IT PASSING THROUGH SUNDAY AFTERNOON. 12Z GFS FORECAST SOUNDING FOR 00Z MONDAY SHOWS A VERY UNSTABLE ATMOSPHERE...HOWEVER A STRONG CAP IS ALSO EVIDENT FROM THE SFC TO 650MB. MODIFYING THE SOUNDING WITH TEMPS IN THE MID 90S AND DEWPOINTS AROUND 70 DOES WEAKEN THE CAP...BUT NOT COMPLETELY. THUS WILL CONTINUE WITH SLIGHT CHC DURING THE DAY AND CHC IN THE EVENING/NIGHT WITH THE FRONT AND WEAKENING CAP. THE UPPER TROUGH LAGS FAIRLY FAR BEHIND MAIN SURFACE FRONT AND DOESNT ARRIVE UNTIL MONDAY AFTERNOON INTO MONDAY NIGHT. EXPECT SHOWERS/THUNDERSTORMS MONDAY BUT PROBABLY NOT SEVERE AS WARMEST AIR AND SURFACE FRONT WILL HAVE PAST WELL EAST OF THE FORECAST AREA. DRIER AND COOLER AIR MOVES IN FOR MON/TUE...THEN A GRADUAL WARM UP ON WED/THU. && .AVIATION...VFR CONDITIONS EXPECTED TO CONTINUE THE NEXT 24HRS WITH ISOLATED THUNDERSTORMS FROM NEAR MIDNIGHT TONIGHT THROUGH THURSDAY MORNING AS AN UPPER LEVEL DISTURBANCE MOVES THROUGH THE STATE. && .BIS WATCHES/WARNINGS/ADVISORIES... NONE. && RSL/KS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BISMARCK ND 515 AM CDT WED JUN 20 2007 NDZ001>005-009>013-017>023-025-031>036-040>046-211015- DIVIDE-BURKE-RENVILLE-BOTTINEAU-ROLETTE-WILLIAMS-MOUNTRAIL-WARD- MCHENRY-PIERCE-MCKENZIE-DUNN-MERCER-OLIVER-MCLEAN-SHERIDAN-WELLS- FOSTER-GOLDEN VALLEY-BILLINGS-STARK-MORTON-BURLEIGH-KIDDER-SLOPE- HETTINGER-GRANT-BOWMAN-ADAMS-SIOUX-EMMONS- 515 AM CDT WED JUN 20 2007 /415 AM MDT WED JUN 20 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL NORTH DAKOTA...NORTHWEST NORTH DAKOTA...SOUTH CENTRAL NORTH DAKOTA...SOUTHEAST NORTH DAKOTA AND SOUTHWEST NORTH DAKOTA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ALONG THE SOUTH DAKOTA BORDER THIS AFTERNOON...THEN A CHANCE OF THUNDERSTORMS TONIGHT OVER ALL OF WESTERN AND CENTRAL NORTH DAKOTA. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY THROUGH MONDAY. AN UNSETTLED WEATHER PATTERN WITH SEVERAL LOW PRESSURE SYSTEMS AFFECTING THE NORTHERN PLAINS...WITH LOW CONFIDENCE IN TIMING AND AREAL EXTENT OF SHOWERS OR THUNDERSHOWERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. NDZ037-047-048-050-051-211015- STUTSMAN-LOGAN-LA MOURE-MCINTOSH-DICKEY- 515 AM CDT WED JUN 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST NORTH DAKOTA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ALONG THE SOUTH DAKOTA BORDER THIS AFTERNOON...THEN A CHANCE OF THUNDERSTORMS TONIGHT OVER ALL OF WESTERN AND CENTRAL NORTH DAKOTA. A SMALL STREAM FLOOD ADVISORY IS IN EFFECT FOR SMALL STREAMS AND LOWLAND FLOODING. SEE THE LATEST FLOOD STATEMENT FOR DETAILS. A RIVER FLOOD WARNING IS IN EFFECT FOR THE JAMES RIVER NEAR LUDDEN DAM AND THE JAMES RIVER AT LAMOURE. SEE THE LATEST FLOOD STATEMENT FOR DETAILS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS THURSDAY THROUGH MONDAY. AN UNSETTLED WEATHER PATTERN WITH SEVERAL LOW PRESSURE SYSTEMS AFFECTING THE NORTHERN PLAINS...WITH LOW CONFIDENCE IN TIMING AND AREAL EXTENT OF SHOWERS OR THUNDERSHOWERS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. JV
The Bismarck radar (KBIS), 133 km away, was scanning. The volume nearest the first event began at 07:25 UTC.
4 hail. Local standard time, as filed.
Windows were reported broken and there was some roof damage.
The hail caused a few broken windows.
No damage was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Dakota in 2007Every state in 2007This day in weather historyWarnings in North Dakota, June 2007
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: 38941, 38942, 38944, 38945.