An upper disturbance moving across the area produced a strong thunderstorm in Munising on the evening of the 13th.
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The episode as NWS MQT wrote it up.
An upper disturbance moving across the area produced a strong thunderstorm in Munising on the evening of the 13th.
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 Jun 13, 2:46 PM EST, 2 hours 4 minutes earlier.
Area Forecast Discussion National Weather Service Marquette MI 346 PM EDT Sun Jun 13 2021 .SHORT TERM...(This evening through Monday) Issued at 308 PM EDT SUN JUN 13 2021 Q-vector convergence/WAA and fgen ahead of a vigorous shortwave approaching from northwest Ontario will bring an area of showers into Upper Mi late this afternoon and evening. Some of these showers already working into the far western cwa although drier air in place looks to be eroding the leading edge. Expect this scattered to broken area of showers to work across the fcst area late this afternoon into this evening as the shortwave dives across the area. With fairly dry dewpoints in the 40s, instability for thunder will be very limited so expect only isolated storms at best and nothing organized despite more favorable shear. Given limited moisture, rain amounts should remain blo a quarter inch. As showers exit southeast late evening, skies will clear from the northwest. Look for min temps generally in the upper 40s to lower 50s, coolest interior west. Another shortwave dives down from nw Ontario on Monday, but again given limited moisture and instability, expect only isolated showers mainly south central. Max temps will be generally in the lower to mid 70s with cooler 60s readings along Lake Superior. .LONG TERM...(Monday night through Sunday) Issued at 346 PM EDT SUN JUN 13 2021 Overall, near-normal temperatures and below-normal precipitation can be expected through the longterm period. Troughing across the NE and GL region and deep troughing the PacNW will result in an anomalous ridge building over the inter mtn west. Between these features. the UP will be in predominately NW flow through the week. During the middle of this upcoming week, the PacNW low lifts NE around the ridge, which brings an elongated ridge axis over the UP on Thursday with stronger, warm southerly winds. As the low continues east, it brings a cold front across the UP sometime Friday into Saturday. Models are suggesting it to be noticeably cooler into next weekend, especially along the Superior shoreline. Monday night through Tuesday and Wednesday, cooler 850mb temps and light northerly flow will bring a nice change of pace for folks across the UP as temps will be in the 60s along Superior and mid 70s interior on Tuesday and about 5 degrees warmer across the board on Wednesday. With the cooler, drier air in place, the UP should be in for some cooler nights. Lows into the 30s seem possible for some Tuesday night, though frost seems unlikely at this point. Southerly flow and warming 850mb temps return on Thursday as the ridge axis shifts overhead in response to a stronger low pressure system shifting through Canada. Tighter pressure gradient btwn exiting high pressure system and approaching low pressure system in Canada will bring stronger southerly winds across the UP. This warm up doesn't last too long as the central CONUS falls into broad troughing and a cold front brings cooler weather back into the UP. The next chance for mentionable pcpn will come with this front Thursday night into Friday. For the weekend, models are honing in on a cold front passage and troughing remaining over the GL region after the fropa. This should bring cooler than normal temperatures across UP, especially those along Superior with a breezy, northerly wind. EC and GEM favor these cooler temperatures through the weekend, with the GFS and GEFS mean favoring a cooler Saturday, with a brief warmup on Sunday before another colder shot moves in to start the next week. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 150 PM EDT SUN JUN 13 2021 VFR conditions should prevail for all terminals through the forecast period. However, mid clouds will thicken and lower this afternoon and evening with some rain showers moving in. There is a small potential for MVFR vsby if a heavier rain showers moves over. A thunderstorm is also possible but the probability is not high enough to include in the TAF. Expect clearing again late tonight and Monday morning as drier air works in behind the showers. && .MARINE...(For the 4 PM Lake Superior forecast issuance) Issued at 308 PM EDT SUN JUN 13 2021 Could be some patchy fog over the Lake tonight with rain showers moving over the area, but don't believe it will be dense. Otherwise, high pressure building into the Upper Lakes winds will be below 20 knots into early Thursday. By late in the week an approaching front will make for a breezier conditions Thursday into Friday. && .MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... None. Lake Michigan... None. && SHORT TERM...Voss LONG TERM...JAW AVIATION...Voss MARINE...Voss
Hazardous Weather Outlook National Weather Service Marquette MI 350 PM EDT Sun Jun 13 2021 MIZ001>007-009>014-084-085-142000- Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce- Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft- Southern Houghton-Northern Schoolcraft- 350 PM EDT Sun Jun 13 2021 /250 PM CDT Sun Jun 13 2021/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Tonight There's a slight chance of a thunderstorm tonight, mainly in west and central Upper Michigan. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... A need for weather spotter reports is not anticipated at this time. LSZ162-240>251-263>267-142000- 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- 350 PM EDT Sun Jun 13 2021 /250 PM CDT Sun Jun 13 2021/ 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 No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-142000- 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- 350 PM EDT Sun Jun 13 2021 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Tonight There's a slight chance of a thunderstorm tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. JAW
The Marquette radar (KMQT), 70 km away, was scanning. The volume nearest the first event began at 21:48 UTC.
2 marine thunderstorm wind. Local standard time, as filed.
The Munising ASOS measured thunderstorm wind gusts of 35 knots.
The Munising ASOS measured thunderstorm wind gusts of 35 knots.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Superior in 2021Every state in 2021This day in weather history
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: 963390, 963392.