Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 10, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Jun 20, 2021, 9:34 PM EDT for Livingston County, Shiawassee County, Michigan. It was in force for 44 min. 4 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
- Jun 20, 2021, 9:34 PM EDT (01:34 UTC)
- Expired
- Jun 20, 2021, 10:18 PM EDT
- In force
- 44 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Livingston County, MI, Shiawassee County, MI
The radar
The Detroit radar (KDTX), 50 km from the middle of the area, began a volume at 01:33 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 |
|---|---|---|---|
| Jun 20, 9:52 PM EDT | TSTM WND DMG | 2 Sse Gregory, MI | LARGE TREE DOWN IN UNADILLA. |
| Jun 20, 9:52 PM EDT | TSTM WND DMG | 3 Ne Gregory, MI | TREE DOWN OVER SHAFFER RD AND PINGREE RD. |
| Jun 20, 10:01 PM EDT | TSTM WND DMG | 1 Ese Pinckney, MI | TREE DOWN OVER DEXTER-PINCKNEY ROAD. |
| Jun 20, 10:05 PM EDT | TSTM WND DMG | Howell, MI | TREES DOWN OVER POWERLINES IN THE CITY OFF HOWELL CAUSING POWER OUTAGES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 20, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 1.6 hours before the alert went out and 53 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
- 133 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1501 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
640
WUUS53 KDTX 210134
SVRDTX
MIC093-155-210230-
/O.NEW.KDTX.SV.W.0010.210621T0134Z-210621T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
934 PM EDT Sun Jun 20 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Shiawassee County in southeastern Michigan...
Livingston County in southeastern Michigan...
* Until 1030 PM EDT.
* At 934 PM EDT, severe thunderstorms were located along a line
extending from East Lansing to Williamston to 8 miles southwest of
Fowlerville to Stockbridge, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Fowlerville around 945 PM EDT.
Pinckney and Laingsburg around 950 PM EDT.
Other locations in the path of these severe thunderstorms include
Perry, Cohoctah, Morrice, Bancroft, Oak Grove, Howell, Byron, Owosso,
Durand, Corunna, Lennon and New Lothrop.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4297 8436 4313 8419 4313 8393 4278 8392
4278 8369 4277 8369 4242 8390 4242 8414
4277 8416 4278 8436
TIME...MOT...LOC 0134Z 232DEG 40KT 4272 8450 4270 8431 4258 8419 4244
8419
HAIL...<.75IN
WIND...60MPH
$$
Mann3 follow-up statements
700
WWUS53 KDTX 210149
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
949 PM EDT Sun Jun 20 2021
MIC093-155-210230-
/O.CON.KDTX.SV.W.0010.000000T0000Z-210621T0230Z/
Shiawassee MI-Livingston MI-
949 PM EDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR SHIAWASSEE AND LIVINGSTON COUNTIES...
At 949 PM EDT, severe thunderstorms were located along a line
extending from near Haslett to near Morrice to near Fowlerville to
near Gregory, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Oak Grove around 955 PM EDT.
Howell, Cohoctah, Byron and Bancroft around 1000 PM EDT.
Owosso and Durand around 1005 PM EDT.
Corunna around 1010 PM EDT.
Lennon around 1020 PM EDT.
New Lothrop around 1025 PM EDT.
Other locations impacted by these severe thunderstorms include
Plainfield, Pinckney State Recreation Area, Conway Township, Vernon,
Parkers Corners, Juddville, Chilson, Bennington, Unadilla and
Shaftsburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4297 8436 4313 8419 4313 8393 4278 8392
4278 8369 4277 8369 4242 8390 4242 8414
4277 8416 4278 8436
TIME...MOT...LOC 0149Z 232DEG 40KT 4281 8434 4279 8415 4267 8403 4253
8403
HAIL...<.75IN
WIND...60MPH
$$
TF640
WWUS53 KDTX 210208
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1008 PM EDT Sun Jun 20 2021
MIC093-155-210230-
/O.CON.KDTX.SV.W.0010.000000T0000Z-210621T0230Z/
Shiawassee MI-Livingston MI-
1008 PM EDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR SHIAWASSEE AND NORTHEASTERN LIVINGSTON COUNTIES...
At 1008 PM EDT, severe thunderstorms were located along a line
extending from near Owosso to Durand to near Linden to near Oak
Grove, moving northeast 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...
Lennon around 1015 PM EDT.
New Lothrop around 1030 PM EDT.
Other locations impacted by these severe thunderstorms include
Chilson, Juddville, Bennington, Vernon, Tyrone Township and Deerfield
Township.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4298 8433 4313 8419 4313 8393 4278 8392
4278 8369 4277 8369 4252 8384 4254 8401
4278 8406 4288 8421
TIME...MOT...LOC 0208Z 224DEG 39KT 4296 8418 4294 8398 4282 8386 4268
8387
HAIL...<.75IN
WIND...60MPH
$$
TF262
WWUS53 KDTX 210218
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1018 PM EDT Sun Jun 20 2021
MIC093-155-210227-
/O.CAN.KDTX.SV.W.0010.000000T0000Z-210621T0230Z/
Shiawassee MI-Livingston MI-
1018 PM EDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SHIAWASSEE AND NORTHEASTERN
LIVINGSTON COUNTIES IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
southeastern Michigan.
LAT...LON 4298 8433 4313 8419 4313 8393 4278 8392
4278 8369 4277 8369 4252 8384 4254 8401
4278 8406 4288 8421
TIME...MOT...LOC 0214Z 232DEG 40KT 4301 8410 4299 8390 4287 8378 4273
8379
$$
TFThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:35 PM EDT | Special Marine Warning | DTX | 55 min | |
| Jun 20, 8:45 PM EDT | Special Weather Statement | DTX | Wayne | 60 min |
| Jun 20, 8:53 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 67 min |
| Jun 20, 9:02 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 58 min |
| Jun 20, 9:12 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 63 min |
| Jun 20, 9:20 PM EDT | Special Marine Warning | DTX | 85 min | |
| Jun 20, 9:23 PM EDT | Special Marine Warning | DTX | 45 min | |
| Jun 20, 9:42 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Monroe, Washtenaw, Wayne | 63 min |
| Jun 20, 9:56 PM EDT | Special Weather Statement | DTX | Macomb | 64 min |
| Jun 20, 10:07 PM EDT | Special Weather Statement | DTX | Genesee | 53 min |
| Jun 20, 10:14 PM EDT | Special Weather Statement | DTX | Oakland | 61 min |
| Jun 20, 10:25 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 41 min |
| Jun 20, 10:42 PM EDT | Special Marine Warning | DTX | 93 min | |
| Jun 20, 10:44 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 61 min |
| Jun 20, 10:54 PM EDT | Special Weather Statement | DTX | Washtenaw | 51 min |
| Jun 20, 11:09 PM EDT | Special Weather Statement | DTX | Lapeer, Saint Clair, Sanilac | 51 min |
| Jun 20, 11:36 PM EDT | Special Weather Statement | DTX | Monroe | 39 min |
| Jun 20, 11:39 PM EDT | Special Marine Warning | DTX | 66 min | |
| Jun 21, 1:09 AM EDT | Special Weather Statement | DTX | Lenawee, Monroe | 51 min |
| Jun 21, 3:15 AM EDT | Special Weather Statement | DTX | Lenawee, Livingston, Washtenaw | 60 min |
| Jun 21, 3:35 AM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 40 min |
| Jun 21, 3:54 AM EDT | Severe Thunderstorm Warning | DTX | Monroe | 51 min |
| Jun 21, 3:56 AM EDT | Special Marine Warning | DTX | 35 min | |
| Jun 21, 4:01 AM EDT | Special Weather Statement | DTX | Macomb, Oakland, Washtenaw, Wayne | 59 min |
| Jun 21, 4:58 AM EDT | Special Weather Statement | DTX | Macomb, Saint Clair | 62 min |
| Jun 21, 5:01 AM EDT | Special Marine Warning | DTX | 34 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.