Alert archive / Michigan / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 47, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Sep 20, 2018, 6:59 PM EDT for Lenawee County, Michigan. It was in force for 41 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 20, 2018, 6:59 PM EDT (22:59 UTC)
- Expired
- Sep 20, 2018, 7:40 PM EDT
- In force
- 41 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Lenawee County, MI
The radar
The Detroit radar (KDTX), 102 km from the middle of the area, began a volume at 22:59 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
Detroit, MI (KDTX), launched 12:00Z, 11.0 hours before the alert went out and 106 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 774 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 189 m²/s²
- 0-3 km storm-relative helicity
- 191 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 Detroit, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 20, 3:43 PM EDT, 3 hours 16 minutes earlier.
Area forecast discussion, Sep 20, 3:43 PM EDT, 3 hours 16 minutes before
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</html>Hazardous weather outlook, Sep 20, 3:49 PM EDT, 3 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 349 PM EDT Thu Sep 20 2018 MIZ047>049-053>055-060>063-068>070-075-076-082-083-212000- Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer- St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe- 349 PM EDT Thu Sep 20 2018 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...This Afternoon and Tonight There is a Marginal Risk for severe weather today across southeast Michigan. An isolated thunderstorm producing damaging winds will be possible now through this evening. Greatest severe threat will be during the afternoon hours. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Very windy conditions on Friday as a strong cold front moves through the region. Gusts to around 40 mph will be possible. .SPOTTER INFORMATION STATEMENT... LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-212000- Lake St Clair- Michigan Waters of Lake Erie from Detroit River to North Cape MI- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore- Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI- Port Sanilac to Port Huron MI- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 349 PM EDT Thu Sep 20 2018 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...This Afternoon and Tonight There is a Marginal Risk for severe weather today across southeast Michigan. An isolated thunderstorm producing damaging winds will be possible now through this evening. Greatest severe threat will be during the afternoon hours. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Gale Warnings in effect Friday through Friday night. Please refer to Lake Huron forecast for additional information. .SPOTTER INFORMATION STATEMENT... You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. TF
In the hours before
Local storm report, Sep 20, 2:23 PM EDT, 4 hours 36 minutes before
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</html>Local storm report, Sep 20, 3:12 PM EDT, 3 hours 47 minutes before
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</html>Local storm report, Sep 20, 4:09 PM EDT, 2 hours 50 minutes before
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</html>Local storm report, Sep 20, 6:22 PM EDT, 37 minutes before
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</html>The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 4:14 AM EDT | Gale Warning | DTX | 48 hr | |
| Sep 20, 4:14 AM EDT | Small Craft Advisory | DTX | 56 hr | |
| Sep 20, 4:25 AM EDT | Beach Hazards Statement | DTX | Huron, Sanilac | 40 hr |
| Sep 20, 9:36 AM EDT | Special Weather Statement | DTX | Wayne | 24 min |
| Sep 20, 11:52 AM EDT | Special Weather Statement | DTX | Shiawassee | 38 min |
| Sep 20, 12:31 PM EDT | Special Weather Statement | DTX | Shiawassee | 44 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.