Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 68, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 11, 2021, 12:02 AM EDT for 5 counties in Michigan. It was in force for 58 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, 12:02 AM EDT (04:02 UTC)
- Expired
- Aug 11, 2021, 1:00 AM EDT
- In force
- 58 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Genesee County, MI, Livingston County, MI, Oakland County, MI, Shiawassee County, MI, Washtenaw County, MI
The radar
The Detroit radar (KDTX), 35 km from the middle of the area, began a volume at 04:03 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, 12:06 AM EDT | TSTM WND DMG | 4 Wsw Owosso, MI | TREES DOWN. 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, 4.0 hours before the alert went out and 38 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.
065
WUUS53 KDTX 110402
SVRDTX
MIC049-093-125-155-161-110500-
/O.NEW.KDTX.SV.W.0068.210811T0402Z-210811T0500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
1202 AM EDT Wed Aug 11 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Western Oakland County in southeastern Michigan...
Shiawassee County in southeastern Michigan...
Livingston County in southeastern Michigan...
Genesee County in southeastern Michigan...
Washtenaw County in southeastern Michigan...
* Until 100 AM EDT.
* At 1202 AM EDT, severe thunderstorms were located along a line
extending from 6 miles northeast of Elsie to near Williamston to
near Vandercook Lake, 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...
Henderson around 1210 AM EDT.
Fowlerville around 1215 AM EDT.
Howell, New Lothrop and Oak Grove around 1225 AM EDT.
Manchester and Montrose around 1230 AM EDT.
Flushing and Brighton around 1235 AM EDT.
Hartland, Clio, Mount Morris and Beecher around 1240 AM EDT.
Ann Arbor, Flint, Saline and Crossroads Village around 1245 AM
EDT.
Milford and Burton around 1250 AM EDT.
Other locations impacted by these severe thunderstorms include
Whittaker, Plainfield, Rankin, Hudson Mills Metropark, Holly State
Recreation Area, Commerce, Delhi Mills, Pleasant Lake, Rose Center
and Pinckney State Recreation Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4313 8435 4313 8393 4322 8393 4322 8346
4259 8344 4244 8347 4243 8355 4209 8354
4209 8413 4277 8416 4278 8435
TIME...MOT...LOC 0402Z 273DEG 40KT 4314 8430 4263 8430 4220 8443
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TF3 follow-up statements
171
WWUS53 KDTX 110421
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1221 AM EDT Wed Aug 11 2021
MIC049-093-125-155-161-110500-
/O.CON.KDTX.SV.W.0068.000000T0000Z-210811T0500Z/
Oakland MI-Shiawassee MI-Livingston MI-Genesee MI-Washtenaw MI-
1221 AM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM EDT
FOR WESTERN OAKLAND...SHIAWASSEE...LIVINGSTON...GENESEE AND WASHTENAW
COUNTIES...
At 1217 AM EDT, a gusty outflow boundary was located along a line
extending from near New Lothrop to near Howell to near Grass Lake,
moving east at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This gusty boundary will be near...
Montrose around 1225 AM EDT.
Flushing and Brighton around 1230 AM EDT.
Hartland, Clio, Mount Morris and Beecher around 1235 AM EDT.
Ann Arbor, Flint, Saline, Milford, Burton and Crossroads Village
around 1240 AM EDT.
Milan, Davison and Otisville around 1245 AM EDT.
Novi, Ypsilanti and Otter Lake around 1250 AM EDT.
Willis around 1255 AM EDT.
Other locations impacted by these gusty winds include Whittaker,
Plainfield, Rankin, Hudson Mills Metropark, Holly State Recreation
Area, Commerce, Delhi Mills, Pleasant Lake, Rose Center and Pinckney
State Recreation Area.
This outflow boundary has a history of producing 60 mph winds and
tree damage in Ingham County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4313 8435 4313 8393 4322 8393 4322 8346
4259 8344 4244 8347 4243 8355 4209 8354
4209 8413 4277 8416 4278 8435
TIME...MOT...LOC 0417Z 272DEG 45KT 4313 8401 4262 8401 4219 8414
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
TF568
WWUS53 KDTX 110437
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1237 AM EDT Wed Aug 11 2021
MIC093-125-161-110446-
/O.CAN.KDTX.SV.W.0068.000000T0000Z-210811T0500Z/
Oakland MI-Livingston MI-Washtenaw MI-
1237 AM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN OAKLAND...LIVINGSTON
AND WASHTENAW COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened. Therefore, the
warning has been cancelled.
LAT...LON 4313 8412 4313 8393 4322 8393 4322 8346
4288 8345 4287 8369 4278 8369 4278 8410
TIME...MOT...LOC 0436Z 253DEG 40KT 4324 8379 4300 8382 4276 8388
$$
MIC049-155-110500-
/O.CON.KDTX.SV.W.0068.000000T0000Z-210811T0500Z/
Shiawassee MI-Genesee MI-
1237 AM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM EDT
FOR EASTERN SHIAWASSEE AND GENESEE COUNTIES...
At 1236 AM EDT, severe thunderstorms were located along a line
extending from Birch Run to near Swartz Creek to near Cohoctah,
moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Clio around 1240 AM EDT.
Mount Morris and Beecher around 1245 AM EDT.
Flint, Burton, Crossroads Village and Lake Fenton around 1250 AM
EDT.
Davison and Otter Lake around 1255 AM EDT.
Grand Blanc and Otisville around 100 AM EDT.
Goodrich around 105 AM EDT.
Other locations impacted by these severe thunderstorms include Atlas,
Juddville, Rankin, Thetford Township, Argentine, Genesee and Vernon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4313 8412 4313 8393 4322 8393 4322 8346
4288 8345 4287 8369 4278 8369 4278 8410
TIME...MOT...LOC 0436Z 253DEG 40KT 4324 8379 4300 8382 4276 8388
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TF521
WWUS53 KDTX 110450
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1250 AM EDT Wed Aug 11 2021
MIC049-155-110500-
/O.EXP.KDTX.SV.W.0068.000000T0000Z-210811T0500Z/
Shiawassee MI-Genesee MI-
1250 AM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SHIAWASSEE AND GENESEE
COUNTIES WILL EXPIRE AT 100 AM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 4313 8412 4313 8393 4322 8393 4322 8346
4288 8345 4287 8369 4278 8369 4278 8410
TIME...MOT...LOC 0450Z 273DEG 40KT 4323 8363 4299 8366 4275 8372
$$
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, 12:43 AM EDT | Severe Thunderstorm Warning | DTX | Bay, Huron, Saginaw, Tuscola | 47 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.