Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 65, NWS Detroit, MI

August 28, 2020Huron County, Sanilac County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Aug 28, 2020, 10:56 PM EDT for Huron County, Sanilac County, Michigan. It was in force for 32 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, 10:56 PM EDT (02:56 UTC)
Expired: Aug 28, 2020, 11:28 PM EDT
In force: 32 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Huron County, MI, Sanilac County, MI

The radar

The Detroit radar (KDTX), 123 km from the middle of the area, began a volume at 02:57 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 00:00Z, 2.9 hours before the alert went out and 120 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 961 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 671 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.9

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 Detroit, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 9:52 PM EDT, 1 hour 4 minutes earlier.

Area forecast discussion, Aug 28, 9:52 PM EDT, 1 hour 4 minutes before

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Hazardous weather outlook, Aug 28, 3:05 PM EDT, 7 hours 51 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

Local storm report, Aug 28, 6:08 PM EDT, 4 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Detroit/Pontiac MI
608 PM EDT FRI AUG 28 2020

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

0502 PM     TSTM WND DMG     4 NNE FLUSHING          43.12N 83.82W
08/28/2020                   Genesee            MI   BROADCAST MEDIA

            MEDIA PASSED ALONG A PHOTO OF SNAPPED TREE

&&

KDK

Local storm report, Aug 28, 7:13 PM EDT, 3 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
713 PM EDT FRI AUG 28 2020

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

0510 PM     HAIL             2 ESE FLUSHING          43.06N 83.81W
08/28/2020  M2.00 INCH       GENESEE            MI   AIRPLANE PILOT

&&

SF

Special weather statement, Aug 28, 9:11 PM EDT, 1 hour 45 minutes before

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Special weather statement, Aug 28, 10:09 PM EDT, 47 minutes before

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Special weather statement, Aug 28, 10:28 PM EDT, 28 minutes before

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Special weather statement, Aug 28, 10:46 PM EDT, 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 8:21 PM EDT	Beach Hazards Statement	DTX	Huron	26 hr
Aug 28, 9:11 PM EDT	Special Weather Statement	DTX	Huron	19 min
Aug 28, 9:35 PM EDT	Special Marine Warning	DTX		60 min
Aug 28, 10:09 PM EDT	Special Weather Statement	DTX	Huron	66 min
Aug 28, 10:28 PM EDT	Special Weather Statement	DTX	Saginaw	47 min
Aug 28, 10:46 PM EDT	Special Weather Statement	DTX	Sanilac	29 min
Aug 28, 11:03 PM EDT	Special Marine Warning	DTX		45 min
Aug 28, 11:24 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw, Shiawassee	41 min
Aug 29, 12:00 AM EDT	Special Weather Statement	DTX	Genesee	60 min
Aug 29, 12:20 AM EDT	Severe Thunderstorm Warning	DTX	Livingston, Washtenaw	55 min
Aug 29, 1:00 AM EDT	Special Weather Statement	DTX	Oakland, Wayne	45 min
Aug 29, 1:17 AM EDT	Special Weather Statement	DTX	Macomb	43 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2020 Every 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.