Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 112, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Sep 7, 2021, 7:36 PM EDT for Shiawassee County, Michigan. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2021, 7:36 PM EDT (23:36 UTC)
- Expired
- Sep 7, 2021, 7:53 PM EDT
- In force
- 17 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Shiawassee County, MI
The radar
The Detroit radar (KDTX), 64 km from the middle of the area, began a volume at 23:39 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 7, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 11.6 hours before the alert went out and 66 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1621 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
087
WUUS53 KDTX 072336
SVRDTX
MIC155-080015-
/O.NEW.KDTX.SV.W.0112.210907T2336Z-210908T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
736 PM EDT Tue Sep 7 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Shiawassee County in southeastern Michigan...
* Until 815 PM EDT.
* At 736 PM EDT, a severe thunderstorm was located near Laingsburg,
moving northeast at 65 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
Owosso around 740 PM EDT.
Corunna and Henderson around 745 PM EDT.
Durand around 750 PM EDT.
New Lothrop and Lennon around 755 PM EDT.
Other locations impacted by this severe thunderstorm include
Juddville, Bennington, Carland and Vernon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4313 8393 4285 8393 4283 8430 4306 8437
4307 8437
TIME...MOT...LOC 2336Z 246DEG 56KT 4294 8428
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SF2 follow-up statements
367
WWUS53 KDTX 072345
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
745 PM EDT Tue Sep 7 2021
MIC155-080015-
/O.CON.KDTX.SV.W.0112.000000T0000Z-210908T0015Z/
Shiawassee MI-
745 PM EDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR CENTRAL SHIAWASSEE COUNTY...
At 744 PM EDT, a severe thunderstorm was located over Corunna, or
near Owosso, moving northeast at 65 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
New Lothrop and Lennon around 755 PM EDT.
Other locations impacted by this severe thunderstorm include
Bennington, Juddville and Vernon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4287 8393 4284 8416 4283 8422 4303 8428
4313 8393
TIME...MOT...LOC 2344Z 246DEG 56KT 4300 8411
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AM178
WWUS53 KDTX 072353
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
753 PM EDT Tue Sep 7 2021
MIC155-080002-
/O.CAN.KDTX.SV.W.0112.000000T0000Z-210908T0015Z/
Shiawassee MI-
753 PM EDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SHIAWASSEE COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds
to 50 mph are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southeastern Michigan.
LAT...LON 4287 8393 4284 8416 4283 8422 4303 8428
4313 8393
TIME...MOT...LOC 2351Z 246DEG 56KT 4306 8394
$$
AMThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 2:51 PM EDT | Special Marine Warning | DTX | 114 min | |
| Sep 7, 2:54 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland | 66 min |
| Sep 7, 3:07 PM EDT | Tornado Warning | DTX | Bay, Midland | 31 min |
| Sep 7, 3:24 PM EDT | Severe Thunderstorm Warning | DTX | Huron | 66 min |
| Sep 7, 3:30 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland, Saginaw | 75 min |
| Sep 7, 3:31 PM EDT | Special Marine Warning | DTX | 77 min | |
| Sep 7, 3:53 PM EDT | Severe Thunderstorm Warning | DTX | Tuscola | 82 min |
| Sep 7, 4:03 PM EDT | Special Marine Warning | DTX | 92 min | |
| Sep 7, 4:19 PM EDT | Special Weather Statement | DTX | Sanilac | 56 min |
| Sep 7, 4:38 PM EDT | Special Weather Statement | DTX | Genesee, Lapeer, Shiawassee | 82 min |
| Sep 7, 4:45 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 31 min |
| Sep 7, 5:14 PM EDT | Special Weather Statement | DTX | Tuscola | 61 min |
| Sep 7, 5:24 PM EDT | Special Weather Statement | DTX | Saginaw | 66 min |
| Sep 7, 5:49 PM EDT | Areal Flood Advisory | DTX | Saginaw | 3 hr |
| Sep 7, 5:55 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Shiawassee | 80 min |
| Sep 7, 6:12 PM EDT | Special Weather Statement | DTX | Sanilac | 78 min |
| Sep 7, 6:18 PM EDT | Special Marine Warning | DTX | 97 min | |
| Sep 7, 6:22 PM EDT | Special Weather Statement | DTX | Tuscola | 53 min |
| Sep 7, 6:23 PM EDT | Special Weather Statement | DTX | Washtenaw | 52 min |
| Sep 7, 6:29 PM EDT | Special Weather Statement | DTX | Arenac | 46 min |
| Sep 7, 6:45 PM EDT | Special Weather Statement | DTX | Oakland | 30 min |
| Sep 7, 6:46 PM EDT | Areal Flood Advisory | DTX | Tuscola | 3 hr |
| Sep 7, 6:54 PM EDT | Special Marine Warning | DTX | 88 min | |
| Sep 7, 7:00 PM EDT | Special Weather Statement | DTX | Bay | 30 min |
| Sep 7, 7:14 PM EDT | Special Marine Warning | DTX | 61 min | |
| Sep 7, 7:21 PM EDT | Special Weather Statement | DTX | Lapeer, Macomb, Saint Clair | 24 min |
| Sep 7, 7:25 PM EDT | Special Weather Statement | DTX | Huron | 35 min |
| Sep 7, 7:33 PM EDT | Special Weather Statement | DTX | Genesee, Shiawassee | 57 min |
| Sep 7, 7:55 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.