Alert archive / Michigan / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 63, NWS Marquette, MI
NWS Marquette, MI issued this severe thunderstorm warning at Aug 21, 2020, 8:19 PM EDT for Ontonagon County, Michigan. It was in force for 26 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 21, 2020, 8:19 PM EDT (00:19 UTC)
- Expired
- Aug 21, 2020, 8:45 PM EDT
- In force
- 26 min
- Issued by
- NWS Marquette, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Ontonagon County, MI
The radar
The Marquette radar (KMQT), 137 km from the middle of the area, began a volume at 00:21 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, 0.3 hours before the alert went out and 272 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.
- Mixed-layer CAPE
- 97 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1889 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 21, 6:52 PM EDT, 1 hour 27 minutes earlier.
Area forecast discussion, Aug 21, 6:52 PM EDT, 1 hour 27 minutes before
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</html>Hazardous weather outlook, Aug 21, 3:56 PM EDT, 4 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Marquette MI 356 PM EDT Fri Aug 21 2020 MIZ001>007-009>014-084-085-222000- Keweenaw-Ontonagon-Northern Houghton-Baraga-Marquette-Alger-Luce- Gogebic-Iron-Dickinson-Menominee-Delta-Southern Schoolcraft- Southern Houghton-Northern Schoolcraft- 356 PM EDT Fri Aug 21 2020 /256 PM CDT Fri Aug 21 2020/ This Hazardous Weather Outlook is for portions of western Upper Michigan and central Upper Michigan. .DAY ONE...Tonight Some strong thunderstorms capable of producing gusty winds and some hail are possible tonight over central and western Upper Michigan. Locally heavy rain could cause some ponding of water, especially in poor drainage areas. Areas of patchy fog will be possible tonight. Some areas could be dense and visibility may change rapidly within a short distance. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Thunderstorms will be possible Saturday through Sunday across Upper Michigan. These could produce locally heavy rain. Thunderstorms are possible late Monday into Thursday. .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. LSZ162-240>251-263>267-222000- 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- 356 PM EDT Fri Aug 21 2020 /256 PM CDT Fri Aug 21 2020/ This Hazardous Weather Outlook is for portions of Eastern Lake Superior...Central Lake Superior and Western Lake Superior. .DAY ONE...Tonight Some thunderstorms will be possible tonight and could be capable of producing gusty winds and heavy downpours that could quickly reduce visibility. Patchy fog could be locally dense tonight. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Plan on periodic thunderstorms Saturday into Saturday night. Thunderstorms are possible again late Monday into Thursday. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. LMZ221-248-250-222000- 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- 356 PM EDT Fri Aug 21 2020 This Hazardous Weather Outlook is for portions of Northern Lake Michigan. .DAY ONE...Tonight Thunderstorms will be possible tonight. These will be capable of producing gusty winds, frequent lightning and heavy downpours that could quickly reduce visibility. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Thunderstorms will be possible Saturday into Saturday night. Thunderstorms will again be possible late Monday into Thursday. .SPOTTER INFORMATION STATEMENT... The need for weather spotter reports is not anticipated at this time. JP
In the hours before
Special weather statement, Aug 21, 5:32 PM EDT, 2 hours 47 minutes before
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</html>Local storm report, Aug 21, 5:35 PM EDT, 2 hours 44 minutes before
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</html>Special weather statement, Aug 21, 7:13 PM EDT, 1 hour 6 minutes before
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</html>The office that day
Everything else NWS Marquette, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 8:00 PM EDT | Severe Thunderstorm Warning | MQT | Gogebic, Ontonagon | 30 min |
| Aug 21, 8:15 PM EDT | Severe Thunderstorm Warning | MQT | Gogebic, Houghton, Ontonagon | 30 min |
| Aug 21, 8:28 PM EDT | Special Marine Warning | MQT | 32 min | |
| Aug 21, 8:47 PM EDT | Special Weather Statement | MQT | Iron, Ontonagon | 43 min |
| Aug 21, 9:33 PM EDT | Special Weather Statement | MQT | Baraga | 27 min |
| Aug 21, 9:47 PM EDT | Special Weather Statement | MQT | Houghton | 28 min |
| Aug 21, 9:58 PM EDT | Special Weather Statement | MQT | Houghton | 32 min |
| Aug 21, 10:28 PM EDT | Special Weather Statement | MQT | Gogebic | 32 min |
| Aug 21, 10:48 PM EDT | Special Weather Statement | MQT | Ontonagon | 27 min |
| Aug 21, 11:35 PM EDT | Areal Flood Advisory | MQT | Gogebic, Ontonagon | 78 min |
| Aug 22, 12:47 AM EDT | Areal Flood Advisory | MQT | Gogebic, Iron, Ontonagon | 4 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.