Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 11, 2021, 2:22 PM EDT for Lenawee County, Washtenaw County, Michigan. It was in force for 68 min. 3 reports 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, 2:22 PM EDT (18:22 UTC)
- Expired
- Aug 11, 2021, 3:30 PM EDT
- In force
- 68 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Lenawee County, MI, Washtenaw County, MI
The radar
The Detroit radar (KDTX), 82 km from the middle of the area, began a volume at 18:24 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, 3:01 PM EDT | TSTM WND GST 70 | 5 Nne Britton, MI | ESTIMATED 70 MPH WINDS. TREES DOWN OVER ONE FOOT DIAMETER. |
| Aug 11, 3:08 PM EDT | TSTM WND DMG | 2 Wnw Milan, MI | NUMEROUS LARGE HEALTHY TREES UPROOTED AND DOWNED POWER LINES. |
| Aug 11, 3:13 PM EDT | TSTM WND GST 58 | 4 S Ann Arbor, MI | MEASURED AT KARB. |
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 12:00Z, 6.4 hours before the alert went out and 86 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
- 106 J/kg
- Mixed-layer CIN
- -290 J/kg
- Mixed-layer LCL
- 1220 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
359
WUUS53 KDTX 111822
SVRDTX
MIC091-161-111930-
/O.NEW.KDTX.SV.W.0070.210811T1822Z-210811T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
222 PM EDT Wed Aug 11 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Lenawee County in southeastern Michigan...
Washtenaw County in southeastern Michigan...
* Until 330 PM EDT.
* At 221 PM EDT, severe thunderstorms were located along a line
extending from near Stockbridge to 6 miles southeast of Reading,
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...
Chelsea around 230 PM EDT.
Dexter around 240 PM EDT.
Hudson around 245 PM EDT.
Clayton and Whitmore Lake around 255 PM EDT.
Salem around 305 PM EDT.
Adrian around 310 PM EDT.
Tecumseh around 320 PM EDT.
Deerfield and Britton around 325 PM EDT.
Other locations impacted by these severe thunderstorms include
Manitou Beach-Devils Lake, Whittaker, Ogden Center, Canandaigua,
Hudson Mills Metropark, Ridgeway, Delhi Mills, Palmyra, Pleasant Lake
and Sand Creek.
People attending Manchester Community Fair should seek safe shelter
immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8436 4207 8413 4242 8413 4244 8356
4209 8354 4208 8377 4172 8377 4171 8436
TIME...MOT...LOC 1821Z 252DEG 37KT 4237 8416 4177 8466
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
KDK3 follow-up statements
593
WWUS53 KDTX 111841
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
241 PM EDT Wed Aug 11 2021
MIC091-161-111930-
/O.CON.KDTX.SV.W.0070.000000T0000Z-210811T1930Z/
Lenawee MI-Washtenaw MI-
241 PM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR LENAWEE AND WASHTENAW COUNTIES...
At 240 PM EDT, severe thunderstorms were located along a line
extending from near Pinckney to near Clayton, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Adrian and Whitmore Lake around 300 PM EDT.
Tecumseh and Blissfield around 310 PM EDT.
Deerfield and Britton around 315 PM EDT.
Milan around 330 PM EDT.
Other locations impacted by these severe thunderstorms include
Manitou Beach-Devils Lake, Whittaker, Ogden Center, Canandaigua,
Hudson Mills Metropark, Ridgeway, Delhi Mills, Palmyra, Pleasant Lake
and Sand Creek.
People attending Manchester Community Fair should seek safe shelter
immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8436 4207 8413 4242 8413 4244 8356
4209 8354 4208 8377 4172 8377 4171 8436
TIME...MOT...LOC 1840Z 249DEG 34KT 4243 8400 4184 8422
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BT309
WWUS53 KDTX 111902
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
302 PM EDT Wed Aug 11 2021
MIC091-161-111930-
/O.CON.KDTX.SV.W.0070.000000T0000Z-210811T1930Z/
Lenawee MI-Washtenaw MI-
302 PM EDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR LENAWEE AND WASHTENAW COUNTIES...
At 301 PM EDT, severe thunderstorms were located along a line
extending from Whitmore Lake to 9 miles east of Morenci, moving east
at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Salem around 310 PM EDT.
Blissfield around 315 PM EDT.
Deerfield around 320 PM EDT.
Clinton around 355 PM EDT.
Other locations impacted by these severe thunderstorms include
Manitou Beach-Devils Lake, Whittaker, Ogden Center, Canandaigua,
Hudson Mills Metropark, Ridgeway, Delhi Mills, Palmyra, Pleasant Lake
and Sand Creek.
People attending Manchester Community Fair should seek safe shelter
immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8436 4207 8413 4242 8413 4244 8356
4209 8354 4208 8377 4172 8377 4171 8436
TIME...MOT...LOC 1901Z 249DEG 42KT 4242 8376 4173 8403
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BT686
WWUS53 KDTX 111926
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
326 PM EDT Wed Aug 11 2021
MIC091-161-111935-
/O.EXP.KDTX.SV.W.0070.000000T0000Z-210811T1930Z/
Lenawee MI-Washtenaw MI-
326 PM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR LENAWEE AND WASHTENAW COUNTIES
WILL EXPIRE AT 330 PM EDT...
The storms which prompted the warning are moving out of the area.
Therefore, the warning will be allowed to expire. However heavy rain
and gusty wind are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Michigan.
LAT...LON 4207 8436 4207 8413 4242 8413 4244 8356
4209 8354 4208 8377 4172 8377 4171 8436
TIME...MOT...LOC 1925Z 252DEG 37KT 4248 8349 4180 8376
$$
BTThe 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, 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, 2:31 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.