I. Sawyer housing area four miles northeast of Gwinn.
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 MQT wrote it up.
Small tree limbs were damaged near the K.I. Sawyer housing area four miles northeast of Gwinn.
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 31, 1:28 PM EST, 1 hour 22 minutes earlier.
Area Forecast Discussion National Weather Service Marquette MI 228 PM EDT Mon Jul 31 2017 .SHORT TERM...(This evening through Tuesday) Issued at 227 PM EDT MON JUL 31 2017 Visible satellite imagery this afternoon shows the lake breezes off of Lake Superior and Lake Michigan nicely, with cumulus looking a bit more agitated across Marquette county, and across a good portions of eastern Upper Michigan where lake breeze convergence is taking place. There is also an outflow boundary moving across Marquette county that is spawning additional convection this afternoon. Ample sunshine through the first half of the day has allowed temperatures to climb into the 80s across the area, with 70s closer to the Great Lakes. Surface ridging remains off to our south; however, upstream of the area a cold front continues to push into the northern Plains this afternoon. This afternoon and evening as convergence increases along the respective lake breezes, where they converge, and where any lingering outflow boundaries set up across the central and east, scattered showers and thunderstorms are expected to develop. We've already seen a couple showers this afternoon have produced a couple lightning strikes at best, but as expected with mid-level shear barely touching 20 knots updrafts have struggled. Therefore, even though we've got upwards of 1500-2000 J/kg of SBCAPE across the central and eastern portions of Upper Michigan, any convection that does develop along the lake breezes will likely struggle to remain organized and should be more pulsey. Severe storms are not expected, but cannot rule out some gusty winds given the dry mid-levels in place across the region. Also, with a moist airmass in place as dew points remain in the mid 60s and PWATs around one inch, heavy rain will be possible as well. As we progress into the overnight hours and we start to lose heating, this diurnal convection will wane. As previously mentioned, it is still looking possible that we could see fog develop tonight into Tuesday morning, especially in locations that see rainfall. Tuesday, the above mentioned cold front will push west to east across Upper Michigan. While ample instability will be present ahead of the cold front, weak shear will remain in place as the main shortwave and strongest mid-level flow remain north in Canada. Therefore, severe storms are not anticipated, but given the potential pulsey nature of updrafts given the lake of shear, cannot rule out some gusty winds, along with heavy rainfall. Convection anchored on the cold front is expected to move into western portions of Upper Michigan during the late morning/early afternoon hours, central during the afternoon, and eventually eastern Upper Michigan into the evening hours. However, by the time the cold front gets to south central and eastern portions of the area, this may be round two of showers and storms for the day. During the afternoon, as temperature heat up quickly and lake breezes develop off Lakes Michigan and Superior, we could see an initial round of showers and storms earlier in the afternoon hours. .LONG TERM...(Tuesday through Sunday) Issued at 439 AM EDT MON JUL 31 2017 After another warm summer day Tuesday, cooler temperatures along with unsettled weather can be expected for the last half of the work week and into the upcoming weekend. The first round of unsettled weather will be ahead of a cold front sliding through the Upper Great Lakes region Tuesday into Tuesday night. Along and ahead of the front, continued warm/moist southerly flow will continue across the area. Added forcing along the front, along with the increased moisture and instability, will allow at least scattered showers and thunderstorms to develop from west to east through this time period. Shear values only look to be in the 15 to 25 knot range along and mainly behind the front, so not really expecting a widespread severe weather threat ahead of the front. There could be some heavy rainfall under the stronger storms that develop along with some gusty winds with low level dry air in place. Small hail may be possible as well; however, the warmer low level thermal profile should help to limit any large hail threat. The next round of rain, more widespread this time, will be Thursday through Friday evening as a fairly strong low pressure system develops over the Central Plains and moves into the Upper Great Lakes. Aloft, most of the eastern CONUS will be under a widespread troughing pattern. The surface low is progged to mover just south of the U.P. into Southern Ontario through this time period. As this happens, deep moisture will wrap around the low as forcing increases to the northwest of the low track. The combination of increasing moisture and forcing will allow for a widespread/soaking rainfall across a majority of the U.P. Models are generally painting out around a half an inch to an inch for a good portion of the U.P. In fact, PWAT values are progged to be around an inch or more for Wednesday into Thursday, which is about about 125 percent of normal. There are still some differences in the heavier rainfall placement, but it does look to be unsettled for this time period. With the increase in precipitation/cloud cover along with cooler air aloft and northerly flow into the area, much cooler temperatures are expected to slide into the area. High temperatures will likely stay in the 60s with overnight lows droppping into the 40s and 50s. The tighter pressure gradient around the surface low will allow the north to northeast winds of 15 to 25 knots to develop larger waves along the Marquette and Alger county shorelines. This will likely create a high swim risk late Thursday into Friday. Behind the surface low, several disturbances will continue to slide around the upper-level trough through much the rest of the extended, bringing intermittent, mainly afternoon chance of rain showers to the area. This general troughing pattern will keep temperatures near to slightly below normal through much of the extended. At this point, will stick with a blend of the models to give the scattered/intermittent rain chance and increased cloud cover. && .AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 131 PM EDT MON JUL 31 2017 This afternoon the weather is expected to remain quiet at KIWD/KCMX, but at KSAW scattered showers and thunderstorms are expected to develop along the lake breeze this afternoon. Satellite imagery does show some congested cumulus developing, with the lake breeze right on KSAWs doorstep. Opted to only include mentions of VCTS for this afternoon for now, and then showers later, but if radar trends throughout the afternoon show increasing coverage in storms amendments will be possible. Any ongoing convection this afternoon will diminish through the evening and into the overnight hours. Tonight there will be the potential for fog at KSAW tonight, do have trended visibilities down a bit. Then the attention turns towards a cold front that will push west to east across Upper Michigan on Tuesday. && .MARINE...(For the 4 PM Lake Superior forecast issuance) Issued at 227 PM EDT MON JUL 31 2017 Ahead of an approaching cold front from the west, southwest winds will increase tonight through Tuesday morning to around 15 to 20 knots, and then further decrease through the afternoon hours to around 15 knots as the pressure gradient weakens a bit. Tuesday night into Wednesday, as the front clears Upper Michigan and better cold air advection pushes south across the lake, winds will become north-northeasterly and increase to 20 knots. On Wednesday, winds will briefly decrease to around 15 knots, before ramping back up into Thursday as system is expected to move across portions of the western Great Lakes. There is still quite a bit of uncertainty in the track of this system, but overall winds of 20 t0 30 knots look possible late Thursday through Friday. Then, winds will relax to under 15 knots this weekend into early next week. && .MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... None. Lake Michigan... None. && SHORT TERM...Ritzman LONG TERM...KEC AVIATION...Ritzman MARINE...Ritzman
Hazardous Weather Outlook National Weather Service Marquette MI 548 AM EDT Mon Jul 31 2017 MIZ001>007-009>014-084-085-011200- Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce- Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft- Southern Houghton-Northern Schoolcraft- 548 AM EDT Mon Jul 31 2017 /448 AM CDT Mon Jul 31 2017/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Today and Tonight Scattered thunderstorms are expected this afternoon into this evening central and east. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are possible Tuesday afternoon and Tuesday night. A high swim risk is expected Friday along the Alger and Marquette County shorelines. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LSZ162-240>251-263>267-011200- 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- 548 AM EDT Mon Jul 31 2017 /448 AM CDT Mon Jul 31 2017/ This Hazardous Weather Outlook is for portions of Eastern Lake Superior...Central Lake Superior and Western Lake Superior. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are possible Tuesday into Tuesday evening. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-011200- 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- 548 AM EDT Mon Jul 31 2017 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Today and Tonight Thunderstorms are possible this afternoon and evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are possible Tuesday afternoon into Tuesday night. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. KEC
Special Weather Statement National Weather Service Marquette MI 336 PM EDT MON JUL 31 2017 MIZ005-312015- Marquette MI- 336 PM EDT MON JUL 31 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MARQUETTE COUNTY UNTIL 415 PM EDT... At 335 PM EDT, Doppler radar was tracking a strong thunderstorm near K. I. Sawyer Airport, or 10 miles southeast of Ishpeming. This storm was nearly stationary. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... K. I. Sawyer Airport, K I Sawyer, Gwinn, Sands, Anderson Lake and Little Lake. 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 4640 8761 4647 8753 4635 8721 4619 8749 TIME...MOT...LOC 1935Z 320DEG 3KT 4638 8750 Ritzman
The Marquette radar (KMQT), 27 km away, was scanning. The volume nearest the first event began at 19:49 UTC.
1 thunderstorm wind. Local standard time, as filed.
There was a report via MPING of small tree limbs damaged near the K. I. Sawyer housing area four miles northeast of Gwinn.
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: 713319.