Thunderstorms initiated near a surface low over southeast Saskatchewan before developing into a line of severe storms which moved southeast into northwest and north central North Dakota where elevated instability and strong deep layer shear were present. The storms contained a mix of large hail and severe winds initially, then towards the end of the episode severe winds prevailed.
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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 BIS wrote it up.
Thunderstorms initiated near a surface low over southeast Saskatchewan before developing into a line of severe storms which moved southeast into northwest and north central North Dakota where elevated instability and strong deep layer shear were present. The storms contained a mix of large hail and severe winds initially, then towards the end of the episode severe winds prevailed. Over western Renville County, one severe storm caused extensive damage to crops and structures with hail to the size of tennis balls and winds gusting to 80 mph. Late in the episode, winds gusting to 80 mph caused extensive damage around the Turtle Lake area of McLean County, including around Crooked Lake where trees were uprooted, pontoons were flipped, and sheds were destroyed.
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 Aug 6, 2:39 PM CST, 3 hours 6 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Bismarck ND 339 PM CDT Tue Aug 6 2024 .KEY MESSAGES... - Showers and thunderstorms to return later today through tonight. Isolated strong to severe storm is possible across the west, with hail up to half dollar size and wind gusts up to 70 mph. - Showers and thunderstorms could linger into Wednesday, although the threat for severe weather is low. Limited chances for precipitation are then expected until later this weekend. - Below normal temperatures are expected for the rest of this week, especially Thursday and Friday with low temperatures forecast in the 40s and high temperatures in the 60s and 70s. && .DISCUSSION... Issued at 339 PM CDT Tue Aug 6 2024 There still remains a conditional isolated severe weather threat through tonight, although timing remains uncertain. Inverted surface trough over Montana has set up a warm front across ND with a cold front currently in Canada. At the meeting point of it all in Canada there are currently strong to severe storms that have formed. As this system progresses two items of interest will be monitored for severe weather. The first being a conditional severe threat along the warm front. This is where the better instability is, although this instability is modest. This threat mainly occurs in the northwest late this afternoon through this evening. The second area of interest will be monitoring the progression of the severe storms currently in Canada. The right moving bunkers vector for these would try to bring these storms into ND mid to late this evening. As usual, storm mode will play a big role in storm hazards. With high amounts of shear and nearly straight hodographs, large hail will be the biggest concern. Decided to increase the hail size to half dollar. If more discrete cells can form perhaps golf ball hail is possible, although the shear vector is not quite perpendicular to any boundary. High DCAPE and 0 to 3 KM shear also have decided to raise the winds to 70 MPH. If storms delay to more along the cold front linear storm mode could help increase these winds. SPC has maintained a Marginal Risk for western ND. Those in the west and perhaps the north should be weather aware through tonight. Otherwise look for mild lows tonight near 60 degrees tonight. As the trough becomes more of a surface low tonight, widespread rain will push across the state tonight with a few embedded thunderstorm. Any areas that see precipitation chances diminish could see patchy fog again, although confidence was not high enough to include in the forecast at this time. Wednesday will see cooler temperatures in the 60s and 70s behind the passage of the weak cold front. Showers and thunderstorms will continue to push eastward through day diminishing in the evening. SPC does clip our southeast with a Marginal Severe weather risk. This area is delayed until later in the day for the passage of the front. Shear will still be abundant. If enough instability can be found then perhaps an isolated severe storm is possible. Winds will generally shift to the north on Wednesday, and may be breezy at times. Thursday through Saturday, a large upper level low lingers across the Great Lakes Region while a ridge flattens in the west. The result will be a cool northwest flow across the area. Breezy winds may be found on Thursday as well. Precipitation chances look minimal given the dryer nature of this flow. What is of interest is the cooler temperatures found in this pattern. Highs on Thursday look to be in the 60s, warming into the 70s through Saturday. Low temperatures could also be quite low, with widespread 40s forecast. ECMWF EFI values are still quite elevated through the end of the week. NBM 10th Percentile forecast even brings upper 30s to some western areas Thursday night into Friday morning. Something to monitor going forward. Later this weekend into next week clusters indicate a return to southwest flow, which can bring some more active pattern. A strong trough pattern is not particularly showing up in the clusters although NBM returns pops to the area. This southwest flow could warm temperatures somewhat and possibly back to near normal readings. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1253 PM CDT Tue Aug 6 2024 Lingering low clouds, and the development of more low clouds and precipitation, could bring periods of MVFR to IFR at times during the forecast period. Currently many sites are experiencing VFR conditions, although a swath of low MVFR clouds remains in western ND. These are slow to erode and may linger through this afternoon, possibly impacting the KDIK TAF. Later today through tonight, showers and thunderstorms are expected to develop along with more low clouds. An isolated strong to severe storm is possible in the west. Cloud ceilings could be MVFR to IFR heights tonight into Wednesday morning. Precipitation becomes more scattered later Wednesday morning, while low clouds could linger. Winds will be southerly today, turning to the north on Wednesday. && .BIS WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...Anglin AVIATION...Anglin
Hazardous Weather Outlook National Weather Service Bismarck ND 229 PM CDT Tue Aug 6 2024 NDZ001-002-009-010-017-018-031>033-040-041-043-044-071930- Divide-Burke-Williams-Mountrail-McKenzie-Dunn-Golden Valley- Billings-Stark-Slope-Hettinger-Bowman-Adams- 229 PM CDT Tue Aug 6 2024 /129 PM MDT Tue Aug 6 2024/ This Hazardous Weather Outlook is for portions of northwest North Dakota and southwest North Dakota. .DAY ONE...This Afternoon and Tonight Isolated to scattered thunderstorms possible later this afternoon through tonight. Some storms may be strong to severe, with hail up to half dollar size and wind gusts as high as 70 mph. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. NDZ003>005-011>013-019>023-025-034>037-042-045>048-050-051-071930- Renville-Bottineau-Rolette-Ward-McHenry-Pierce-Mercer-Oliver- McLean-Sheridan-Wells-Foster-Morton-Burleigh-Kidder-Stutsman- Grant-Sioux-Emmons-Logan-La Moure-McIntosh-Dickey- 229 PM CDT Tue Aug 6 2024 /129 PM MDT Tue Aug 6 2024/ This Hazardous Weather Outlook is for portions of north central North Dakota, south central North Dakota, and southeast North Dakota. .DAY ONE...This Afternoon and Tonight Isolated to scattered thunderstorms possible this evening through tonight. Severe weather is not expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The Minot AFB radar (KMBX), 71 km away, was scanning. The volume nearest the first event began at 23:43 UTC.
11 hail, 10 thunderstorm wind. Local standard time, as filed.
The hail combined with thunderstorm wind gusts to damage the roof and siding on a home.
Seven hopper style bins were blown over.
The hail combined with thunderstorm wind gusts to destroy a wheat field.
A roof was blown off of a pole barn, and the walls were also damaged.
The hail combined with thunderstorm wind gusts to cause crop damage in the area.
A few tree branches blew down.
Multiple trees were uprooted at Crooked Lake. Small sheds were destroyed, fences were blown down, and pontoons were flipped and some damaged.
Three large grain bins were partially caved in by the thunderstorm wind gusts.
A center pivot irrigation system was flipped over and damaged.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Dakota in 2024Every state in 2024This day in weather historyWarnings in North Dakota, August 2024
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: 1205295, 1205297, 1205300, 1205303, 1205305, 1205306, 1205391, 1205319, 1205320, 1205322, 1205323, 1205324, 1205326, 1205364, 1205365, 1205369, 1205370, 1205372, 1205374, 1205375, 1205376.