Alert archive / Michigan / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 64, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 28, 2020, 4:43 PM EDT for Genesee County, Michigan. It was in force for 59 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 28, 2020, 4:43 PM EDT (20:43 UTC)
- Expired
- Aug 28, 2020, 5:42 PM EDT
- In force
- 59 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Genesee County, MI
The radar
The Detroit radar (KDTX), 41 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 40 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
- 195 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 698 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Aug 28, 3:02 PM EDT, 1 hour 41 minutes earlier.
Area forecast discussion, Aug 28, 3:02 PM EDT, 1 hour 41 minutes before
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</html>Hazardous weather outlook, Aug 28, 3:05 PM EDT, 1 hour 38 minutes before
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 305 PM EDT Fri Aug 28 2020 MIZ047>049-053>055-060>063-068>070-075-076-082-083-291915- Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer- St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe- 305 PM EDT Fri Aug 28 2020 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...This Afternoon and Tonight Periods of thunderstorms are expected the rest of today and tonight. The primary threat will be wind gusts of 60 mph or greater and torrential rainfall which could lead to possible flooding. Storm motion this afternoon will be from the northwest at 35 mph then from the west at 45 mph overnight. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed later today or tonight. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-291915- 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- 305 PM EDT Fri Aug 28 2020 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...This Afternoon and Tonight Periods of thunderstorms are expected today and tonight. The primary threat will be wind gusts of 50 knots or greater and torrential rainfall which could lead to possible flooding. Storm motion this afternoon will be from the northwest at 30 knots then from the west at 40 knots overnight. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Strong winds from a low pressure system crossing through The Straits may lead to Small Craft Advisory wind and wave conditions on Saturday. .SPOTTER INFORMATION STATEMENT... You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. KDK
In the hours before
Special weather statement, Aug 28, 2:54 PM EDT, 1 hour 49 minutes before
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</html>Local storm report, Aug 28, 3:19 PM EDT, 1 hour 24 minutes before
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</html>Local storm report, Aug 28, 3:19 PM EDT, 1 hour 24 minutes before
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</html>Local storm report, Aug 28, 3:30 PM EDT, 1 hour 13 minutes before
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</html>Local storm report, Aug 28, 3:55 PM EDT, 48 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 |
|---|---|---|---|---|
| Aug 28, 3:53 AM EDT | Areal Flood Advisory | DTX | Shiawassee | 4 hr |
| Aug 28, 4:56 AM EDT | Areal Flood Warning | DTX | Shiawassee | 3 hr |
| Aug 28, 5:36 AM EDT | Areal Flood Advisory | DTX | Macomb, Oakland | 3 hr |
| Aug 28, 6:02 AM EDT | Areal Flood Advisory | DTX | Oakland | 3 hr |
| Aug 28, 6:11 AM EDT | Flash Flood Warning | DTX | Macomb, Oakland | 4 hr |
| Aug 28, 6:26 AM EDT | Areal Flood Advisory | DTX | Wayne | 4 hr |
| Aug 28, 7:03 AM EDT | Flash Flood Warning | DTX | Wayne | 3 hr |
| Aug 28, 9:44 AM EDT | Small Craft Advisory | DTX | 44 hr | |
| Aug 28, 10:02 AM EDT | Areal Flood Warning | DTX | Macomb, Oakland, Wayne | 6 hr |
| Aug 28, 12:54 PM EDT | Special Weather Statement | DTX | Washtenaw | 66 min |
| Aug 28, 1:40 PM EDT | Special Marine Warning | DTX | 65 min | |
| Aug 28, 1:52 PM EDT | Special Weather Statement | DTX | Monroe | 38 min |
| Aug 28, 2:22 PM EDT | Special Weather Statement | DTX | Washtenaw | 53 min |
| Aug 28, 2:37 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Washtenaw | 53 min |
| Aug 28, 2:54 PM EDT | Special Weather Statement | DTX | Monroe, Wayne | 66 min |
| Aug 28, 3:20 PM EDT | Special Marine Warning | DTX | 38 min | |
| Aug 28, 3:29 PM EDT | Special Weather Statement | DTX | Shiawassee | 46 min |
| Aug 28, 4:29 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw, Shiawassee | 58 min |
| Aug 28, 5:44 PM EDT | Special Weather Statement | DTX | Lapeer | 61 min |
| Aug 28, 6:03 PM EDT | Lakeshore Flood Advisory | DTX | Huron | 36 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.