Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 74, NWS Marquette, MI

September 26, 2020Menominee County, Michigan

NWS Marquette, MI issued this severe thunderstorm warning at Sep 26, 2020, 5:24 PM CDT for Menominee County, Michigan. It was in force for 21 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 26, 2020, 5:24 PM CDT (22:24 UTC)
Expired
Sep 26, 2020, 5:45 PM CDT
In force
21 min
Issued by
NWS Marquette, MI
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

County Menominee County, MI

The radar

The Marquette radar (KMQT), 112 km from the middle of the area, began a volume at 22:26 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 12:00Z, 10.4 hours before the alert went out and 125 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 12:00Z on 2020-09-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 87 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 12:00Z on 2020-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
87 J/kg
Mixed-layer CIN
-480 J/kg
Mixed-layer LCL
1032 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
116 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 26, 3:35 PM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Sep 26, 3:35 PM CDT, 1 hour 49 minutes before
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Hazardous weather outlook, Sep 26, 4:13 PM CDT, 1 hour 11 minutes before
Hazardous Weather Outlook
National Weather Service Marquette MI
513 PM EDT Sat Sep 26 2020

MIZ001>007-009>013-084-085-271200-
Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce-
Gogebic-Iron-Dickinson-Menominee-Delta-Southern Houghton-
Northern Schoolcraft-
513 PM EDT Sat Sep 26 2020 /413 PM CDT Sat Sep 26 2020/

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

.DAY ONE...Tonight

Scattered to numerous thunderstorms are expected tonight,
especially during the evening into the early overnight hours. A
few thunderstorms may become severe with large hail the greatest
risk. Frequent lightning and torrential downpours will also
accompany some of the storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any observed strong winds, wind
damage or hail caused by thunderstorms to the National Weather
Service in Marquette. The public may also submit reports to the
National Weather Service via phone, on our website, or through
Facebook or Twitter via #906wx.

MIZ014-271200-
Southern Schoolcraft-
513 PM EDT Sat Sep 26 2020

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

.DAY ONE...Tonight

There is a moderate swim risk for the Lake Michigan beaches of
Schoolcraft County through this evening.

Scattered to numerous thunderstorms are expected tonight,
especially during the evening into the early overnight hours. A
few thunderstorms may become severe with large hail the greatest
risk. Frequent lightning and torrential downpours will also
accompany some of the storms.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is a high swim risk for the Lake Michigan beaches of
Schoolcraft County on Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any observed strong winds, wind
damage or hail caused by thunderstorms to the National Weather
Service in Marquette. The public may also submit reports to the
National Weather Service via phone, on our website, or through
Facebook or Twitter via #906wx.

LMZ221-248-250-271200-
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-
513 PM EDT Sat Sep 26 2020

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

.DAY ONE...Tonight

Scattered to numerous thunderstorms are expected tonight.
Isolated severe thunderstorms are possible.

Patchy fog will persist tonight. The fog may be locally dense over
western Lake Superior.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

The need for weather spotter reports is not anticipated at this
time.

LSZ162-240>251-263>267-271200-
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-
513 PM EDT Sat Sep 26 2020 /413 PM CDT Sat Sep 26 2020/

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

.DAY ONE...Tonight

Scattered to numerous thunderstorms are expected tonight, mainly
during the evening. A few severe thunderstorms are possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

The need for weather spotter reports is not anticipated at this
time.

Rolfson

In the hours before

Special weather statement, Sep 26, 4:19 PM CDT, 1 hour 5 minutes before
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Special weather statement, Sep 26, 5:12 PM CDT, 12 minutes before
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Special weather statement, Sep 26, 5:19 PM CDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 25, 7:04 PM CDTSpecial Weather StatementMQTOntonagon26 min
Sep 25, 7:14 PM CDTSevere Thunderstorm WarningMQTOntonagon46 min
Sep 25, 7:25 PM CDTSpecial Marine WarningMQT35 min
Sep 25, 7:46 PM CDTSevere Thunderstorm WarningMQTBaraga, Houghton, Ontonagon29 min
Sep 25, 7:52 PM CDTSpecial Weather StatementMQTGogebic23 min
Sep 25, 8:04 PM CDTSpecial Weather StatementMQTOntonagon26 min
Sep 25, 8:15 PM CDTSpecial Weather StatementMQTKeweenaw30 min
Sep 25, 8:16 PM CDTSpecial Marine WarningMQT44 min
Sep 25, 8:25 PM CDTSpecial Marine WarningMQT35 min
Sep 25, 8:30 PM CDTSpecial Weather StatementMQTGogebic30 min
Sep 25, 8:34 PM CDTSpecial Weather StatementMQTBaraga26 min
Sep 25, 8:43 PM CDTAreal Flood AdvisoryMQTHoughton62 min
Sep 25, 8:50 PM CDTSpecial Marine WarningMQT25 min
Sep 25, 8:54 PM CDTSevere Thunderstorm WarningMQTBaraga, Marquette36 min
Sep 25, 9:05 PM CDTSpecial Marine WarningMQT25 min
Sep 25, 9:08 PM CDTSevere Thunderstorm WarningMQTBaraga, Iron, Marquette37 min
Sep 25, 9:22 PM CDTSpecial Marine WarningMQT42 min
Sep 25, 9:27 PM CDTSevere Thunderstorm WarningMQTGogebic, Iron33 min
Sep 25, 9:31 PM CDTSevere Thunderstorm WarningMQTMarquette29 min
Sep 25, 9:42 PM CDTSpecial Marine WarningMQT33 min
Sep 26, 9:21 AM CDTMarine Dense Fog AdvisoryMQT10 hr
Sep 26, 10:23 AM CDTSmall Craft AdvisoryMQT43 hr
Sep 26, 4:19 PM CDTSpecial Weather StatementMQTMenominee26 min
Sep 26, 5:12 PM CDTSpecial Weather StatementMQTMenominee18 min
Sep 26, 5:19 PM CDTSpecial Weather StatementMQTMenominee26 min
Sep 26, 5:35 PM CDTSpecial Marine WarningMQT40 min
Sep 26, 5:58 PM CDTSpecial Marine WarningMQT47 min
Sep 26, 6:59 PM CDTSpecial Weather StatementMQTIron46 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2020Every severe thunderstorm warning in 2020

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.