Alert archive / Michigan / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 62, NWS Marquette, MI

September 1, 2018Baraga County, Michigan

NWS Marquette, MI issued this severe thunderstorm warning at Sep 1, 2018, 3:35 AM EDT for Baraga County, Michigan. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 1, 2018, 3:35 AM EDT (07:35 UTC)
Expired
Sep 1, 2018, 4:03 AM EDT
In force
28 min
Issued by
NWS Marquette, MI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Baraga County, MI

The radar

The Marquette radar (KMQT), 64 km from the middle of the area, began a volume at 07:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 7.6 hours before the alert went out and 248 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 2018-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 98 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 2018-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
98 J/kg
Mixed-layer CIN
-222 J/kg
Mixed-layer LCL
1182 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Sep 1, 2:34 AM EDT, 1 hour 1 minute earlier.

Area forecast discussion, Sep 1, 2:34 AM EDT, 1 hour 1 minute before
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Hazardous weather outlook, Aug 31, 5:06 PM EDT, 10 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Marquette MI
506 PM EDT Fri Aug 31 2018

MIZ001>007-009>014-084-085-012115-
Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce-
Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft-
Southern Houghton-Northern Schoolcraft-
506 PM EDT Fri Aug 31 2018 /406 PM CDT Fri Aug 31 2018/

This Hazardous Weather Outlook is for portions of western Upper
Michigan and central Upper Michigan.

.DAY ONE...Tonight

Thunderstorms containing gusty winds and moderate to locally heavy
rainfall may be possible. Areas that have already received
multiple rounds of rain may experience localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Multiple rounds of thunderstorms will be possible through mid-
week. Late Sunday, thunderstorms may contain gusty winds and
moderate to locally heavy rainfall. Areas that have already
received multiple rounds of rain may experience localized
flooding.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to submit reports to the National
Weather Service in Marquette. The public may also submit reports
at our webpage, Facebook page, or on Twitter.

LSZ162-240>251-263>267-012115-
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-
506 PM EDT Fri Aug 31 2018 /406 PM CDT Fri Aug 31 2018/

This Hazardous Weather Outlook is for portions of Eastern Lake
Superior...Central Lake Superior and Western Lake Superior.

.DAY ONE...Tonight

Thunderstorms containing gusty winds and moderate to locally heavy
rainfall may be possible. Fog, reducing visibilities, may also be
possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Multiple rounds of thunderstorms will be possible through mid-
week. Late Sunday, thunderstorms may contain gusty winds and
moderate to locally heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to submit reports to the National
Weather Service in Marquette. The public may also submit reports
at our webpage, Facebook page, or on Twitter.

LMZ221-248-250-012115-
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-
506 PM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for portions of Northern Lake
Michigan.

.DAY ONE...Tonight

Thunderstorms containing gusty winds and moderate to locally heavy
rainfall may be possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Multiple rounds of thunderstorms will be possible through mid-
week. Late Sunday, thunderstorms may contain gusty winds and
moderate to locally heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to submit reports to the National
Weather Service in Marquette. The public may also submit reports
at our webpage, Facebook page, or on Twitter.

lg

In the hours before

Local storm report, Aug 31, 10:26 PM EDT, 5 hours 9 minutes before
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Local storm report, Aug 31, 11:10 PM EDT, 4 hours 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
1110 PM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     MARINE TSTM WIND STANNARD ROCK           47.18N 87.22W
08/31/2018  M45 MPH          LSZ266             MI   BUOY

            BUOY STATION STDM4, STANNARD ROCK.

0400 PM     MARINE TSTM WIND 29 N GRAND MARAIS       47.10N 85.90W
08/31/2018  M40 MPH          LSZ267             MI   SHIP

            VESSEL ASSINIBOINE VCKQ, 29 N GRAND MARAIS.

0623 PM     MARINE TSTM WIND COPPER HARBOR           47.47N 87.88W
08/31/2018  M36 MPH          KEWEENAW           MI   ASOS

            ASOS STATION P59, COPPER HARBOR.

0350 PM     MARINE TSTM WIND MINNEAPOLIS SHOAL       45.58N 87.00W
08/31/2018  M35 MPH          LMZ221             MI   MESONET

            MESONET STATION XMAPV, MINNEAPOLIS SHOAL.

&&

JSS
Special weather statement, Aug 31, 11:47 PM EDT, 3 hours 48 minutes before
Special Weather Statement
National Weather Service Marquette MI
1147 PM EDT FRI AUG 31 2018

MIZ001-010430-
Keweenaw MI-
1147 PM EDT FRI AUG 31 2018

...SIGNIFICANT WEATHER ADVISORY FOR ISLE ROYALE IN KEWEENAW COUNTY
UNTIL 1230 AM EDT...

At 1145 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Windigo, or 24 miles west of Siskiwit Lake, moving
east at 50 mph.

Very heavy rainfall and winds up to 40 mph will be possible with
this storm.

Locations impacted include...
Siskiwit Lake, Mott Island Park Headquarters, Windigo, Rock Harbor
and Mount Desor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek safe
shelter inside a building if possible.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4819 8839 4814 8833 4799 8855 4778 8916
      4781 8934 4792 8934 4803 8909 4818 8869
TIME...MOT...LOC 0345Z 252DEG 42KT 4786 8929

Rolfson
Local storm report, Sep 1, 12:32 AM EDT, 3 hours 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
1232 AM EDT SAT SEP 1 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1153 PM     MARINE TSTM WIND ROCK OF AGES            47.87N 89.31W
08/31/2018  M43 MPH          LSZ263             MI   C-MAN STATION

&&
Special weather statement, Sep 1, 2:57 AM EDT, 38 minutes before
Special Weather Statement
National Weather Service Marquette MI
257 AM EDT SAT SEP 1 2018

MIZ001-003-010745-
Keweenaw MI-Houghton MI-
257 AM EDT SAT SEP 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR KEWEENAW AND NORTHEASTERN
HOUGHTON COUNTIES UNTIL 345 AM EDT...

At 256 AM EDT, Doppler radar was tracking a strong thunderstorm over
Dollar Bay, or near Houghton, moving northeast at 40 mph.

Torrential rain and winds up to 40 mph will be possible with this
storm.

Locations impacted include...
Houghton, Calumet, Eagle Harbor, Copper Harbor, Eagle River, Hancock,
Laurium, Chassell, Lake Linden, Brockway Mountain, Bete Grise,
Houghton County Airport, Lac La Belle, Phoenix, Dollar Bay, Hubbell,
The Upper Entrance of Portage Canal, Mohawk, Gay and Allouez.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4738 8751 4734 8758 4732 8784 4717 8811
      4713 8814 4701 8852 4725 8873 4753 8816
      4754 8784
TIME...MOT...LOC 0656Z 246DEG 36KT 4713 8846

Rolfson

The office that day

Everything else NWS Marquette, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 9:17 PM EDTSpecial Marine WarningMQT58 min
Aug 31, 10:54 PM EDTSpecial Marine WarningMQT2 hr
Aug 31, 11:47 PM EDTSpecial Weather StatementMQT43 min
Sep 1, 12:39 AM EDTSpecial Marine WarningMQT51 min
Sep 1, 12:43 AM EDTSpecial Marine WarningMQT92 min
Sep 1, 1:10 AM EDTSevere Thunderstorm WarningMQTGogebic, Ontonagon65 min
Sep 1, 2:07 AM EDTSevere Thunderstorm WarningMQTOntonagon53 min
Sep 1, 2:13 AM EDTSpecial Marine WarningMQT62 min
Sep 1, 2:57 AM EDTSpecial Weather StatementMQTKeweenaw48 min
Sep 1, 3:02 AM EDTSpecial Marine WarningMQT58 min
Sep 1, 4:08 AM EDTSpecial Weather StatementMQTBaraga37 min
Sep 1, 4:30 AM EDTBeach Hazards StatementMQTSchoolcraft16 hr
Sep 1, 6:59 AM EDTSpecial Weather StatementMQTHoughton16 min
Sep 1, 7:01 AM EDTSpecial Marine WarningMQT59 min
Sep 1, 7:26 AM EDTSpecial Marine WarningMQT94 min
Sep 1, 7:43 AM EDTSpecial Weather StatementMQTKeweenaw47 min
Sep 1, 6:14 PM EDTSpecial Weather StatementMQTMarquette61 min
Sep 1, 6:30 PM EDTSpecial Marine WarningMQT60 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2018Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.