Severe thunderstorms forming along a lake breeze boundary downed multiple trees near the Wisconsin state line on the afternoon of the 30th.
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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 MQT wrote it up.
Severe thunderstorms forming along a lake breeze boundary downed multiple trees near the Wisconsin state line on the afternoon of the 30th.
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 Marquette, MI wrote its last area forecast discussion before the first event at Jul 30, 1:55 PM CST, 2 hours 10 minutes earlier.
Area Forecast Discussion National Weather Service Marquette MI 355 PM EDT Sun Jul 30 2017 .SHORT TERM...(This evening through Monday) Issued at 354 PM EDT SUN JUL 30 2017 WV imagery and RAP analysis indicated a mid/upper level ridge from the srn plains into the Great Basin with downstream nw flow through the wrn Great Lakes. At the surface, weak wnw flow prevailed between high pressure from Iowa into the srn Great Lakes and a weak trough over nrn Ontario. The combination of daytime heating pushing MLCAPE values into the 1000-1500 J/Kg range, a weak shrtwv and lake breeze boundaries have supported sct/isold shra/tsra over inland portions of Upper Michigan. Most of the stronger tsra were moving into the srn cwa. With weak 0-6km shear less than 20 knots, only brief heavy downpours are likely with possibly some gusty winds and small hail. Tonight, expect the shra/tsra to weaken and dissipate this evening with the loss of heating. However, sct tsra will persist across for areas along and south of US-2 through the late afternoon with only a few isold lighter showers south of M-28. Additional low level moistening from the rain followed by clearing overnight will support at least patchy fog development. Monday, Similar to today, MLCAPEs into the 1k-2k J/Kg range in the afternoon along with the another weak shrtwv moving into the area, the high res models suggest that lake breeze boundaries cntrl will provide enough low level conv to help trigger isold/sct shra/tsra. 0-6km shear values only near 15 knots and high freezing levels will again favor mainly pulse tsra with brief periods of heavy rain. .LONG TERM...(Monday night through Sunday) Issued at 245 PM EDT SUN JUL 30 2017 Nam shows a 500 mb ridge over the western U.S. with a trough over the ern U.S. 00z Tue. The trough over the ern U.S. digs this forecast period with the ridge amplifying in the west. Nam shows some 850-500 mb q-vector convergence along with limited moisture through Wed morning over the area. GFS and ECMWF show the same thing. Did not make too many changes to the going forecast. In the extended, the GFS and ECMWF show a 500 mb trough over the central and eastern U.S. 12z Thu with a shortwave digging into the upper Great Lakes 12z Fri. A 500 mb ridge remains over the western U.S. in the amplified upper pattern 12z Sat and the upper pattern changes little for Sun with troughing in the ern U.S. and ridging over the western U.S. Temperatures will continue below normal for this forecast period along with some chance pops for Thu night and Fri. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 151 PM EDT SUN JUL 30 2017 VFR conditions are expected through the forecast period. A couple showers and possibly a thunderstorm are expected to develop near KSAW this afternoon before shifting southward by late afternoon. Fog will be possible, mainly at KSAW, if rain moves across or near the TAF site. This may reduce visibility at times to MVFR or lower at times. However, confidence in any vsby reduction was still low and not mentioned in the TAF at this time. && .MARINE...(For the 4 PM Lake Superior forecast issuance) Issued at 354 PM EDT SUN JUL 30 2017 Winds will remain below 20 knots through the forecast period as high pressure remains over the area into Wednesday. && .MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... None. Lake Michigan... None. && SHORT TERM...JLB LONG TERM...07 AVIATION...JLB MARINE...JLB
Hazardous Weather Outlook National Weather Service Marquette MI 332 PM EDT Sun Jul 30 2017 MIZ001>007-009>014-084-085-311200- Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce- Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft- Southern Houghton-Northern Schoolcraft- 332 PM EDT Sun Jul 30 2017 /232 PM CDT Sun Jul 30 2017/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Tonight Isolated thunderstorms are possible early this evening over south central Upper Michigan. Locally dense fog is possible late tonight over central Upper Michigan. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible Monday afternoon, and then again Tuesday afternoon and Tuesday night. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LSZ162-240>251-263>267-311200- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM-Saxon Harbor WI to Black River MI- Black River to Ontonagon MI- Ontonagon to Upper Entrance of Portage Canal MI- Upper Entrance of Portage Canal to Eagle River MI- Eagle River to Manitou Island MI- Manitou Island to Point Isabelle MI- Point Isabelle to Lower Entrance of Portage Canal MI- Lower Entrance of Portage Canal To Huron Islands MI Including Keweenaw and Huron Bays-Huron Islands to Marquette MI- Marquette to Munising MI-Munising to Grand Marais MI- Grand Marais to Whitefish Point MI- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 332 PM EDT Sun Jul 30 2017 /232 PM CDT Sun Jul 30 2017/ This Hazardous Weather Outlook is for portions of Eastern Lake Superior...Central Lake Superior and Western Lake Superior. .DAY ONE...Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible Tuesday into Tuesday night. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-311200- Green Bay North of line from Cedar River MI to Rock Island Passage-Seul Choix Point to Point Detour MI- 5NM East of a line from Fairport MI to Rock Island Passage- 332 PM EDT Sun Jul 30 2017 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Tonight Thunderstorms are possible this evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible Monday afternoon and evening and Tuesday afternoon and Tuesday night. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. 07
Special Weather Statement
National Weather Service Marquette MI
308 PM CDT SUN JUL 30 2017
MIZ012-302045-
Menominee MI-
308 PM CDT SUN JUL 30 2017
...SPECIAL WEATHER STATEMENT...
At 308 PM CDT, Doppler radar was tracking a strong thunderstorm over
Menominee, moving south at 15 mph.
Half inch hail will be possible with this storm.
Locations impacted include...
Menominee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4511 8763 4511 8766 4515 8768 4517 8773
4520 8755 4516 8759 4513 8761 4511 8761
4509 8760
TIME...MOT...LOC 2008Z 345DEG 12KT 4514 8763
KluberSpecial Weather Statement
National Weather Service Marquette MI
402 PM CDT SUN JUL 30 2017
MIZ012-302130-
Menominee MI-
402 PM CDT SUN JUL 30 2017
...SPECIAL WEATHER STATEMENT...
At 401 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cedar River, moving south at 15 mph.
Half inch hail will be possible with this storm.
Locations impacted include...
Cedar River, Arthur Bay and Wells State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4543 8746 4545 8731 4541 8732 4541 8735
4539 8736 4537 8740 4529 8744 4524 8749
TIME...MOT...LOC 2101Z 002DEG 11KT 4542 8738
KluberThe Green Bay radar (KGRB), 104 km away, was scanning. The volume nearest the first event began at 22:02 UTC.
1 thunderstorm wind. Local standard time, as filed.
Multiple trees were down on Menominee County Road 577 near the Wisconsin state line. The time of the report was estimated from radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2017Every state in 2017This day in weather historyWarnings in Michigan, July 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: 713317.