A thunderstorm cell formed over northern Cass County in North Dakota during the early afternoon of June 17th. The storm tracked east-southeast and passed to the north of the Fargo-Moorhead area, and straight into central Clay County in Minnesota, where it dropped quarter sized hail near Hawley.
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The episode as NWS FGF wrote it up.
A thunderstorm cell formed over northern Cass County in North Dakota during the early afternoon of June 17th. The storm tracked east-southeast and passed to the north of the Fargo-Moorhead area, and straight into central Clay County in Minnesota, where it dropped quarter sized hail near Hawley.
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 Grand Forks, ND wrote its last area forecast discussion before the first event at Jun 17, 11:53 AM CST, 1 hour 22 minutes earlier.
Area Forecast Discussion National Weather Service Grand Forks ND 1253 PM CDT Sat Jun 17 2017 .UPDATE... Issued at 1235 PM CDT Sat Jun 17 2017 No changes to the ongoing forecast. Convection beginning to develop along a line from Devils Lake to the southeast to just north of Fargo to south of Park Rapids. Will be watching this activity grow in coverage and spread to the southeast over the afternoon and evening. Given best shear remains along the southern tier of counties in the forecast area with 30 to 40kts most cells should be outflow dominate with 1 inch hail and gusty winds up to 60mph the primary threats. UPDATE Issued at 1030 AM CDT Sat Jun 17 2017 Per SPC morning update of adding the southern two thirds of the FA into a marginal risk for severe storms will be updating the wording in HWO. Given the environment with MLCAPE ranging between 500-1000 J/kg and effective bulk shear values up to 35kt, expecting a multi-cell convective scenario to play out this afternoon. With relatively low freezing levels, between 8000 to 9000ft, increased possibility of hail around an inch and subsequent downbursts with winds up to 60mph seem to be the primary threat with the stronger pulsating updrafts. Widespread organized severe storms not expected, but isolated strong storms with a severe storm or two is possible. Most areas will have the potential for brief heavy downpours, small hail and some gusty winds. && .SHORT TERM...(Today and tonight) Issued at 345 AM CDT Sat Jun 17 2017 Degree of rain chances main challenge through the short term. Short wave crossing the northern rockies to dig some as it propagates across the region today. Associated cold front will drop through the fa today. By early afternoon boundary should be through the northern third of the forecast area. Some diurnal heating, modest instability, cape, and shear should aid in development this afternoon. Based on timing of front best coverage of shra/tsra will be across at least the south half of the fa. Clouds and cold advection will limit temperature recovery across the north to the 60s with warmer temperatures to the south. Showers and T should continue into the evening hours across mainly the south diminishing late evening as boundary sags south of region. With cold advection continuing will see minimums in the lower 50s with 40s across the north. .LONG TERM...(Sunday through Friday) Issued at 345 AM CDT Sat Jun 17 2017 A cool day Sunday with high temperatures in the 60s. Most areas likely to be dry with best chances across the west closer to exit region of jet streak dropping through canada. stronger signal for showers will be later Monday/Monday night as next wave drops through the Fa in persistent NW mid level flow. Temperatures to continue blo average. Split flow aloft develops over North America through the period with the northern stream over central Canada and southern stream over the northern states. Long wave trough over the Gulf of AK will move into southwest Canada/Pacific Northwest. Long wave trough over the Canadian archipelago will rotate into the Hudson Bay. The ECMWF was a little faster and farther south than the GFS. The GFS was trending faster than the ECMWF early in the period. Both the ECMWF and the GFS were trending a little slower late in the period. Will blend the models. Short waves are expected to move through Wed and Thu. Little change to high temperatures but were generally decreased a degree or less for Tue, Wed, and Thu. No change on Fridays high temps from yesterday package. && .AVIATION...(For the 06Z TAFS through 06Z Saturday night) Issued at 1134 PM CDT Fri Jun 16 2017 Not much difference from the previous set of TAFs. Overall winds look to remain on the lower end. Models still indicating some low end VFR or high end MVFR clouds along the highway 2 corridor toward Saturday morning, which could affect KDVL/KGFK/KTVF. Not high confidence in this occurring, so kept them in the low end of the VFR range for now. Models continue to show the better potential for afternoon thunder across the south (KFAR) along with the better pcpn amounts. Therefore mentioned a thunder potential at KFAR from mid afternoon into the early evening. Thereafter coverage should decrease along with the thunder threat. && .AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1235 PM CDT Sat Jun 17 2017 General increase in coverage of showers and thunderstorms this afternoon into the early evening then quickly diminishing into tonight. Best thunderstorm chance will be impacting the FAR area around 22-02Z. Otherwise expected SHRAs at other TAF sites with broken CIGs lowering into the MVFR range overnight as north winds bring cloud deck south from Canada. By morning stratus deck impacting all sites with IFR CIGS possible in the east, BJI and TVF. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None. && UPDATE...JK SHORT TERM...Voelker LONG TERM...JH/Voelker AVIATION...JK
Hazardous Weather Outlook National Weather Service Grand Forks ND 1013 AM CDT Sat Jun 17 2017 MNZ001>003-009-013>017-022>024-027>032-040-NDZ027>030-038-039-049- 052-053-181515- West Polk-Norman-Clay-North Beltrami-Pennington-Red Lake- East Polk-North Clearwater-South Beltrami-Mahnomen- South Clearwater-Hubbard-West Becker-East Becker-Wilkin- West Otter Tail-East Otter Tail-Wadena-Grant-Grand Forks-Griggs- Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland- 1013 AM CDT Sat Jun 17 2017 This hazardous weather outlook is for portions of eastern North Dakota, west central and northwest Minnesota. .DAY ONE...Today and Tonight Scattered showers and thunderstorms are expected from late morning into the evening hours. Best chances for thunderstorms will be across the south half of the region. An isolated severe is possible with hail around an inch in size and wind gusts to 60mph. .DAYS TWO THROUGH SEVEN...Sunday through Friday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. MNZ004>008-NDZ006>008-014>016-024-026-054-181515- Kittson-Roseau-Lake Of The Woods-West Marshall-East Marshall- Towner-Cavalier-Pembina-Benson-Ramsey-Eastern Walsh County-Eddy- Nelson-Western Walsh County- 1013 AM CDT Sat Jun 17 2017 This hazardous weather outlook is for portions of eastern North Dakota, west central and northwest Minnesota. .DAY ONE...Today and Tonight Scattered showers and thunderstorms are expected from late morning into the evening hours. Best chances for thunderstorms will be across the southern half of the region. Severe storms are not anticipated in the Devils Lake basin and northern Red River valley. .DAYS TWO THROUGH SEVEN...Sunday through Friday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
Special Weather Statement National Weather Service Eastern ND/Grand Forks ND 134 PM CDT SAT JUN 17 2017 MNZ003-171930- Clay MN- 134 PM CDT SAT JUN 17 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CLAY COUNTY UNTIL 230 PM CDT... At 132 PM CDT, the doppler radar indicated a strong thunderstorm over Kragnes, or 11 miles north of Fargo, moving southeast at 20 mph. Dime size hail was reported at Argusville and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Averill around 200 PM CDT. Glyndon around 205 PM CDT. Muskoda around 225 PM CDT. Hawley around 230 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Grand Forks. && LAT...LON 4696 9678 4713 9680 4709 9619 4672 9631 TIME...MOT...LOC 1832Z 297DEG 18KT 4703 9674 JK
Special Weather Statement National Weather Service Eastern ND/Grand Forks ND 144 PM CDT SAT JUN 17 2017 MNZ015>017-022>024-171945- Mahnomen MN-South Clearwater MN-Hubbard MN-East Polk MN- North Clearwater MN-South Beltrami MN- 144 PM CDT SAT JUN 17 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HUBBARD... SOUTHEASTERN POLK...SOUTHERN BELTRAMI...NORTHEASTERN MAHNOMEN AND SOUTHERN CLEARWATER COUNTIES UNTIL 245 PM CDT... At 143 PM CDT, Doppler radar was tracking a strong thunderstorm near Lengby, or 32 miles west of Bemidji, moving southeast at 20 mph. Dime size hail will be possible with this storm. This strong thunderstorm will be near... Ebro around 155 PM CDT. Bagley around 210 PM CDT. Rice Lake around 215 PM CDT. Shevlin around 225 PM CDT. Upper Rice Lake around 240 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Grand Forks. && LAT...LON 4752 9573 4767 9557 4746 9502 4724 9525 TIME...MOT...LOC 1843Z 304DEG 15KT 4756 9556 PJS
The Fargo/Grand Forks radar (KMVX), 107 km away, was scanning. The volume nearest the first event began at 19:16 UTC.
1 hail. Local standard time, as filed.
A video showed large hail and stripped crops near Silver Lake.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2017Every state in 2017This day in weather historyWarnings in Minnesota, June 2017
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: 697393.