Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 59, NWS Detroit, MI

August 14, 2020Lenawee County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Aug 14, 2020, 4:14 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
Aug 14, 2020, 4:14 PM EDT (20:14 UTC)
Expired
Aug 14, 2020, 4:55 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 20:17 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, 8.2 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.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 2020-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Detroit, MI at 12:00Z on 2020-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1710 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 14, 3:54 PM EDT, 20 minutes earlier.

Area forecast discussion, Aug 14, 3:54 PM EDT, 20 minutes before
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Hazardous weather outlook, Aug 14, 3:30 AM EDT, 12 hours 44 minutes before
Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
330 AM EDT Fri Aug 14 2020

MIZ047>049-055-150830-
Midland-Bay-Huron-Sanilac-
330 AM EDT Fri Aug 14 2020

This hazardous weather outlook is for portions of southeast
Michigan.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms on Saturday and Sunday. Isolated
severe thunderstorms are possible Saturday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-150830-
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-
330 AM EDT Fri Aug 14 2020

This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.

.DAY ONE...Today and Tonight

There is a chance of thunderstorms this afternoon over Lake st. Clair
and especially Lake Erie. These thunderstorms are not expected to be
severe, but will produce heavy rainfall and wind gusts to 40 knots.
Storm motion looks to be light and variable.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms on Saturday and Sunday. Isolated
severe thunderstorms are possible both afternoons.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

MIZ053-054-060>063-068>070-075-076-082-083-150830-
Saginaw-Tuscola-Shiawassee-Genesee-Lapeer-St. Clair-Livingston-
Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
330 AM EDT Fri Aug 14 2020

This hazardous weather outlook is for most of southeast Michigan.

.DAY ONE...Today and Tonight

There is a chance of thunderstorms this afternoon, especially toward
the southern Michigan border. These thunderstorms are not expected to
be severe, but will produce heavy rainfall and wind gusts to 45 mph.
Storm motion looks to be light and variable.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms on Saturday and Sunday. Isolated
severe thunderstorms are possible both afternoons.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

SF

In the hours before

Special weather statement, Aug 14, 12:20 PM EDT, 3 hours 54 minutes before
Special Weather Statement
National Weather Service Detroit/Pontiac MI
1220 PM EDT Fri Aug 14 2020

MIZ076-141715-
Wayne-
1220 PM EDT Fri Aug 14 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN WAYNE COUNTY...

At 1219 PM EDT, a strong thunderstorm was located near Belle Isle, or
near Grosse Pointe, moving west at 5 mph.

Winds in excess of 30 mph are possible with this storm.

This storm will be near...
  Downtown Detroit around 1235 PM EDT.
  Detroit and Dearborn around 115 PM EDT.

Other locations impacted by this storm include Highland Park,
Northeast Detroit, Harper Woods, Grosse Pointe Shores, Southwest
Detroit, Hamtramck, Grosse Pointe Woods, Grosse Pointe Park, Grosse
Pointe Farms and Melvindale.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4236 8290 4233 8299 4232 8306 4229 8310
      4229 8318 4245 8319 4245 8286
TIME...MOT...LOC 1619Z 106DEG 5KT 4239 8299

SC
Local storm report, Aug 14, 1:32 PM EDT, 2 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
132 PM EDT FRI AUG 14 2020

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

1227 PM     MARINE TSTM WIND 2 S GROSSE POINTE       42.36N 82.91W
08/14/2020  M42.00 MPH       LCZ460             MI   MESONET

            36KT GUST MEASURED AT PECHE ISLAND LIGHT.

&&

KDK
Special weather statement, Aug 14, 1:36 PM EDT, 2 hours 38 minutes before
Special Weather Statement
National Weather Service Detroit/Pontiac MI
136 PM EDT Fri Aug 14 2020

MIZ075-076-141830-
Washtenaw-Wayne-
136 PM EDT Fri Aug 14 2020

...A THUNDERSTORM WILL AFFECT NORTHWESTERN WAYNE AND EAST CENTRAL
WASHTENAW COUNTIES...

At 136 PM EDT, a thunderstorm was located near Ypsilanti, moving
northwest at 10 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Ann Arbor, Livonia, Romulus, Ypsilanti, Canton, Dixboro, Westland,
Wayne, Plymouth and Barton Hills.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4224 8334 4220 8364 4230 8379 4238 8342
TIME...MOT...LOC 1736Z 124DEG 10KT 4227 8355

SC
Special weather statement, Aug 14, 2:05 PM EDT, 2 hours 9 minutes before
Special Weather Statement
National Weather Service Detroit/Pontiac MI
205 PM EDT Fri Aug 14 2020

MIZ075-141845-
Washtenaw-
205 PM EDT Fri Aug 14 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL WASHTENAW
COUNTY...

At 205 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Dixboro to near Grass Lake. Movement
was northwest at 15 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Ann Arbor, Chelsea, Dexter, Manchester, Salem, Dixboro, Whitmore
Lake, Barton Hills, Hudson Mills Metropark, Delhi Mills, Pleasant
Lake, Hudson Mills and Lyndon Township.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4239 8413 4243 8369 4243 8360 4240 8355
      4229 8355 4213 8413
TIME...MOT...LOC 1805Z 136DEG 13KT 4235 8361 4221 8414

SC
Special weather statement, Aug 14, 3:33 PM EDT, 41 minutes before
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Special weather statement, Aug 14, 4:08 PM EDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 12:13 PM EDTSpecial Marine WarningDTX36 min
Aug 14, 12:20 PM EDTSpecial Weather StatementDTXWayne55 min
Aug 14, 1:36 PM EDTSpecial Weather StatementDTXWashtenaw54 min
Aug 14, 2:05 PM EDTSpecial Weather StatementDTXWashtenaw40 min
Aug 14, 2:42 PM EDTSevere Thunderstorm WarningDTXWashtenaw48 min
Aug 14, 3:26 PM EDTAreal Flood AdvisoryDTXWashtenaw2 hr
Aug 14, 3:33 PM EDTSpecial Weather StatementDTXLenawee42 min
Aug 14, 4:08 PM EDTSpecial Weather StatementDTXLenawee52 min
Aug 14, 4:40 PM EDTSpecial Weather StatementDTXLenawee65 min
Aug 14, 4:47 PM EDTAreal Flood AdvisoryDTXLenawee3 hr
Aug 14, 5:23 PM EDTSpecial Weather StatementDTXShiawassee52 min
Aug 14, 5:45 PM EDTSpecial Weather StatementDTXLenawee60 min
Aug 14, 5:52 PM EDTSpecial Weather StatementDTXSaginaw53 min

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.