Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 47, NWS Marquette, MI

August 10, 2020Dickinson County, Menominee County, Michigan

NWS Marquette, MI issued this severe thunderstorm warning at Aug 10, 2020, 1:09 PM CDT for Dickinson County, Menominee County, Michigan. It was in force for 51 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
Aug 10, 2020, 1:09 PM CDT (18:09 UTC)
Expired
Aug 10, 2020, 2:00 PM CDT
In force
51 min
Issued by
NWS Marquette, MI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Dickinson County, MI, Menominee County, MI

The radar

The Marquette radar (KMQT), 86 km from the middle of the area, began a volume at 18:12 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 10, 12:58 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 6.2 hours before the alert went out and 420 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, Alpena, MI at 12:00Z on 2020-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1546 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, Alpena, MI at 12:00Z on 2020-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.193958Sfc1 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
1546 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
588 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.5

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 Aug 10, 12:43 PM CDT, 26 minutes earlier.

Area forecast discussion, Aug 10, 12:43 PM CDT, 26 minutes before
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Hazardous weather outlook, Aug 10, 3:31 AM CDT, 9 hours 38 minutes before
Hazardous Weather Outlook
National Weather Service Marquette MI
431 AM EDT Mon Aug 10 2020

MIZ001>007-009>014-084-085-110845-
Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce-
Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft-
Southern Houghton-Northern Schoolcraft-
431 AM EDT Mon Aug 10 2020 /331 AM CDT Mon Aug 10 2020/

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 morning across the west
half, then becoming more numerous across the east half this
afternoon and evening. Heavy rain and gusty winds will be possible
with thunderstorm activity.

A moderate swim risk is expected for the Lake Michigan beaches of
Schoolcraft County today.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any observed hail or wind
damage from 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 using #906wx.

LSZ162-240>251-263>267-110845-
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-
431 AM EDT Mon Aug 10 2020 /331 AM CDT Mon Aug 10 2020/

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

.DAY ONE...Today and Tonight

Areas of dense fog will remain possible through mid-day,
especially over northern Lake Superior.

Thunderstorms remain possible today, especially this afternoon
over eastern Lake Superior. Heavy rain and gusty winds will be
possible with thunderstorm activity.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

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

LMZ221-248-250-110845-
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-
431 AM EDT Mon Aug 10 2020

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

.DAY ONE...Today and Tonight

Thunderstorms are expected today, especially this afternoon and
evening. Heavy rain and gusty winds will be possible with thunderstorm
activity.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

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

Ritzman

In the hours before

Special weather statement, Aug 10, 11:55 AM CDT, 1 hour 14 minutes before
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Local storm report, Aug 10, 11:56 AM CDT, 1 hour 13 minutes before
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Local storm report, Aug 10, 12:07 PM CDT, 1 hour 2 minutes before
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Special weather statement, Aug 10, 12:31 PM CDT, 38 minutes before
Special Weather Statement
National Weather Service Marquette MI
131 PM EDT Mon Aug 10 2020

MIZ006-085-101815-
Northern Schoolcraft MI-Alger MI-
131 PM EDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN SCHOOLCRAFT AND CENTRAL
ALGER COUNTIES UNTIL 215 PM EDT...

At 131 PM EDT, Doppler radar was tracking a strong thunderstorm over
Shingleton, or 9 miles southeast of Miners Castle, moving northeast
at 35 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Munising, Grand Marais, Miners Castle, Chapel Lake, Shingleton, Grand
Sable Dunes, Cusino Lake, Beaver Lake, Au Sable Point, Wetmore,
Melstrand, Snyder Lake, Van Meer, Nawakwa Lake, Kingston Lake and
Grand Portal Point.

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 4668 8586 4646 8586 4624 8667 4649 8659
      4669 8618 4674 8586 4669 8583
TIME...MOT...LOC 1731Z 239DEG 31KT 4637 8644

RJC
Local storm report, Aug 10, 12:38 PM CDT, 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
138 PM EDT MON AUG 10 2020

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

1015 AM     HEAVY RAIN       IRONWOOD                46.45N 90.15W
08/10/2020  M1.75 INCH       GOGEBIC            MI   PUBLIC

            REPORTED VIA FACEBOOK (TV6).

&&

LG
Special weather statement, Aug 10, 12:47 PM CDT, 22 minutes before
Special Weather Statement
National Weather Service Marquette MI
1247 PM CDT Mon Aug 10 2020

MIZ011-012-101815-
Menominee MI-Dickinson MI-
1247 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DICKINSON AND
NORTHWESTERN MENOMINEE COUNTIES UNTIL 115 PM CDT...

At 1247 PM CDT, Doppler radar was tracking a strong thunderstorm over
Norway, or 10 miles southeast of Iron Mountain, moving east at 25
mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Norway, Hermansville, Waucedah, Loretto, Vulcan, Cunard and
Quinnesec.

LAT...LON 4571 8782 4573 8786 4574 8786 4575 8788
      4576 8796 4582 8800 4597 8755 4572 8743
      4568 8779
TIME...MOT...LOC 1747Z 251DEG 21KT 4576 8787

RJC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 7:11 PM CDTSpecial Marine WarningMQT64 min
Aug 9, 7:13 PM CDTSevere Thunderstorm WarningMQTHoughton, Ontonagon32 min
Aug 9, 7:32 PM CDTSevere Thunderstorm WarningMQTHoughton, Ontonagon28 min
Aug 9, 7:43 PM CDTSpecial Weather StatementMQTOntonagon47 min
Aug 9, 7:57 PM CDTSevere Thunderstorm WarningMQTHoughton33 min
Aug 9, 8:05 PM CDTSevere Thunderstorm WarningMQTHoughton, Keweenaw13 min
Aug 9, 8:08 PM CDTSevere Thunderstorm WarningMQTHoughton26 min
Aug 9, 8:09 PM CDTSpecial Marine WarningMQT36 min
Aug 9, 8:15 PM CDTSpecial Marine WarningMQT90 min
Aug 9, 8:31 PM CDTSpecial Weather StatementMQTBaraga, Houghton, Iron29 min
Aug 9, 8:32 PM CDTAreal Flood AdvisoryMQTBaraga, Houghton, Ontonagon3 hr
Aug 9, 8:44 PM CDTSevere Thunderstorm WarningMQTIron46 min
Aug 9, 8:47 PM CDTSpecial Marine WarningMQT88 min
Aug 9, 8:52 PM CDTSevere Thunderstorm WarningMQTBaraga, Houghton23 min
Aug 9, 9:13 PM CDTSpecial Weather StatementMQTMarquette62 min
Aug 9, 9:16 PM CDTFlash Flood WarningMQTHoughton3 hr
Aug 9, 9:23 PM CDTSevere Thunderstorm WarningMQTDickinson, Iron37 min
Aug 9, 9:28 PM CDTSevere Thunderstorm WarningMQTBaraga, Iron, Marquette32 min
Aug 9, 9:53 PM CDTSevere Thunderstorm WarningMQTDickinson, Marquette52 min
Aug 9, 9:59 PM CDTSpecial Marine WarningMQT80 min
Aug 9, 9:59 PM CDTTornado Warning Tornado observedMQTDickinson31 min
Aug 9, 10:00 PM CDTTornado Warning Tornado observedMQTIron15 min
Aug 9, 10:35 PM CDTSpecial Weather StatementMQTAlger40 min
Aug 9, 10:50 PM CDTSpecial Marine WarningMQT40 min
Aug 9, 11:16 PM CDTSpecial Weather StatementMQTDelta44 min
Aug 10, 8:42 AM CDTSevere Thunderstorm WarningMQTDickinson, Marquette, Menominee33 min
Aug 10, 8:49 AM CDTSpecial Weather StatementMQTMarquette41 min
Aug 10, 9:11 AM CDTSevere Thunderstorm WarningMQTAlger, Delta, Dickinson, Marquette49 min
Aug 10, 9:28 AM CDTSpecial Marine WarningMQT47 min
Aug 10, 9:29 AM CDTSmall Craft AdvisoryMQT6 hr
Aug 10, 9:55 AM CDTSevere Thunderstorm WarningMQTAlger, Schoolcraft35 min
Aug 10, 10:06 AM CDTSpecial Marine WarningMQT39 min
Aug 10, 11:05 AM CDTSpecial Weather StatementMQTDickinson40 min
Aug 10, 11:22 AM CDTSpecial Weather StatementMQTLuce23 min
Aug 10, 11:31 AM CDTSevere Thunderstorm WarningMQTDickinson, Marquette, Menominee44 min
Aug 10, 11:44 AM CDTSevere Thunderstorm WarningMQTLuce16 min
Aug 10, 11:55 AM CDTSpecial Weather StatementMQTAlger35 min
Aug 10, 11:59 AM CDTSpecial Marine WarningMQT15 min
Aug 10, 12:09 PM CDTSevere Thunderstorm WarningMQTDelta, Dickinson, Marquette, Menominee32 min
Aug 10, 12:27 PM CDTSpecial Marine WarningMQT33 min
Aug 10, 12:31 PM CDTSpecial Weather StatementMQTAlger44 min
Aug 10, 12:47 PM CDTSpecial Weather StatementMQTDickinson28 min
Aug 10, 1:52 PM CDTSevere Thunderstorm WarningMQTDelta, Menominee38 min
Aug 10, 2:07 PM CDTSpecial Marine WarningMQT98 min
Aug 10, 2:25 PM CDTSpecial Weather StatementMQTSchoolcraft35 min
Aug 10, 2:43 PM CDTSevere Thunderstorm WarningMQTMenominee47 min
Aug 10, 2:52 PM CDTSpecial Marine WarningMQT53 min
Aug 10, 3:10 PM CDTSevere Thunderstorm WarningMQTMenominee35 min
Aug 10, 3:29 PM CDTSpecial Weather StatementMQTLuce31 min
Aug 10, 3:42 PM CDTSmall Craft AdvisoryMQT30 hr

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.