Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 69, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 11, 2021, 12:43 AM EDT for 4 counties in Michigan. It was in force for 47 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 11, 2021, 12:43 AM EDT (04:43 UTC)
- Expired
- Aug 11, 2021, 1:30 AM EDT
- In force
- 47 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Bay County, MI, Huron County, MI, Saginaw County, MI, Tuscola County, MI
The radar
The Detroit radar (KDTX), 106 km from the middle of the area, began a volume at 04:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 12:52 AM EDT | TSTM WND DMG | 2 Ese Sebewaing, MI | TREES DOWN ON WIRES. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 4.7 hours before the alert went out and 104 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
- 2462 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 962 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.7
The text
As transmitted.
615
WUUS53 KDTX 110443
SVRDTX
MIC017-063-145-157-110530-
/O.NEW.KDTX.SV.W.0069.210811T0443Z-210811T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
1243 AM EDT Wed Aug 11 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Tuscola County in southeastern Michigan...
Southeastern Bay County in southeastern Michigan...
Northeastern Saginaw County in southeastern Michigan...
Western Huron County in southeastern Michigan...
* Until 130 AM EDT.
* At 1242 AM EDT, severe thunderstorms were located along a line
extending from 10 miles northeast of Essexville to near Quanicassee
to 6 miles southeast of Frankenmuth, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Akron and Fairgrove around 1250 AM EDT.
Unionville around 1255 AM EDT.
Caro and Sebewaing around 100 AM EDT.
Mayville around 105 AM EDT.
Pigeon, Gagetown and Owendale around 110 AM EDT.
Cass City and Kingston around 115 AM EDT.
Elkton around 120 AM EDT.
Other locations impacted by these severe thunderstorms include East
Dayton, Arthur, Tuscola, Colling, Wilmot, Wisner, Bay Port,
Ellington, Gera and Gilford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4333 8312 4332 8335 4324 8335 4322 8383
4368 8387 4362 8368 4372 8358 4375 8351
4379 8348 4387 8349 4393 8344 4395 8334
4400 8327 4403 8311
TIME...MOT...LOC 0442Z 257DEG 40KT 4371 8369 4353 8364 4326 8366
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TF3 follow-up statements
523
WWUS53 KDTX 110500
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
100 AM EDT Wed Aug 11 2021
MIC017-145-110510-
/O.CAN.KDTX.SV.W.0069.000000T0000Z-210811T0530Z/
Bay MI-Saginaw MI-
100 AM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BAY AND
NORTHEASTERN SAGINAW COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4333 8312 4332 8335 4324 8335 4323 8358
4360 8362 4372 8358 4375 8351 4379 8348
4387 8349 4393 8344 4395 8334 4400 8327
4403 8311
TIME...MOT...LOC 0500Z 257DEG 40KT 4375 8346 4357 8341 4330 8343
$$
MIC063-157-110530-
/O.CON.KDTX.SV.W.0069.000000T0000Z-210811T0530Z/
Tuscola MI-Huron MI-
100 AM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM EDT
FOR TUSCOLA AND WESTERN HURON COUNTIES...
At 100 AM EDT, severe thunderstorms were located along a line
extending from Sebewaing to near Akron to near Mayville, moving east
at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Owendale around 110 AM EDT.
Cass City, Pigeon and Gagetown around 115 AM EDT.
Elkton and Kingston around 120 AM EDT.
Other locations impacted by these severe thunderstorms include East
Dayton, Colling, Wilmot, Wisner, Bay Port, Ellington, Deford,
Colwood, Bach and Watrousville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4333 8312 4332 8335 4324 8335 4323 8358
4360 8362 4372 8358 4375 8351 4379 8348
4387 8349 4393 8344 4395 8334 4400 8327
4403 8311
TIME...MOT...LOC 0500Z 257DEG 40KT 4375 8346 4357 8341 4330 8343
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TF608
WWUS53 KDTX 110515
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
115 AM EDT Wed Aug 11 2021
MIC063-157-110530-
/O.CON.KDTX.SV.W.0069.000000T0000Z-210811T0530Z/
Tuscola MI-Huron MI-
115 AM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM EDT
FOR EASTERN TUSCOLA AND WESTERN HURON COUNTIES...
At 114 AM EDT, severe thunderstorms were located along a line
extending from near Owendale to near Gagetown to near Mayville,
moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Cass City and Pigeon around 120 AM EDT.
Elkton around 125 AM EDT.
Other locations impacted by these severe thunderstorms include East
Dayton, Deford, Colling, Wilmot, Colwood, Bay Port, Bach, Ellington
and Silverwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4333 8312 4332 8333 4332 8335 4375 8351
4379 8348 4387 8349 4393 8344 4395 8334
4400 8327 4403 8311
TIME...MOT...LOC 0514Z 257DEG 40KT 4377 8332 4359 8327 4332 8329
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TF558
WWUS53 KDTX 110531
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
131 AM EDT Wed Aug 11 2021
MIC063-157-110541-
/O.EXP.KDTX.SV.W.0069.000000T0000Z-210811T0530Z/
Tuscola MI-Huron MI-
131 AM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN TUSCOLA AND WESTERN
HURON COUNTIES HAS EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.
LAT...LON 4333 8312 4332 8333 4332 8335 4375 8351
4379 8348 4387 8349 4393 8344 4395 8334
4400 8327 4403 8311
TIME...MOT...LOC 0531Z 257DEG 40KT 4380 8315 4362 8310 4335 8312
$$
TFThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 11:43 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland, Saginaw | 62 min |
| Aug 10, 11:53 PM EDT | Special Weather Statement | DTX | Genesee, Livingston, Shiawassee, Washtenaw | 52 min |
| Aug 10, 11:58 PM EDT | Special Marine Warning | DTX | 92 min | |
| Aug 11, 12:02 AM EDT | Severe Thunderstorm Warning | DTX | Genesee, Livingston, Oakland, Shiawassee, Washtenaw | 58 min |
| Aug 11, 1:09 AM EDT | Special Marine Warning | DTX | 81 min | |
| Aug 11, 1:11 AM EDT | Special Weather Statement | DTX | Huron | 49 min |
| Aug 11, 1:29 AM EDT | Special Marine Warning | DTX | 46 min | |
| Aug 11, 4:04 AM EDT | Heat Advisory | DTX | Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw and 1 more | 13 hr |
| Aug 11, 2:22 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Washtenaw | 68 min |
| Aug 11, 2:31 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 42 min |
| Aug 11, 2:42 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 63 min |
| Aug 11, 2:59 PM EDT | Severe Thunderstorm Warning | DTX | Monroe, Wayne | 76 min |
| Aug 11, 3:02 PM EDT | Special Weather Statement | DTX | Genesee | 58 min |
| Aug 11, 3:09 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 66 min |
| Aug 11, 3:16 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Shiawassee | 59 min |
| Aug 11, 3:17 PM EDT | Special Marine Warning | DTX | 88 min | |
| Aug 11, 3:36 PM EDT | Special Marine Warning | DTX | 84 min | |
| Aug 11, 3:36 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb, Saint Clair, Sanilac | 69 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.