Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Jun 29, 2021, 1:06 PM EDT for 4 counties in Michigan. It was in force for 54 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 29, 2021, 1:06 PM EDT (17:06 UTC)
- Expired
- Jun 29, 2021, 2:00 PM EDT
- In force
- 54 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Genesee County, MI, Livingston County, MI, Oakland County, MI, Shiawassee County, MI
The radar
The Detroit radar (KDTX), 47 km from the middle of the area, began a volume at 17:06 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 29, 1:19 PM EDT | TSTM WND DMG | Byron, MI | SPOTTERS AND COUNTY OFFICIALS REPORTED NUMEROUS TREES DOWN ACROSS FAR SOUTHERN SHIAWASEE COUNTY. |
| Jun 29, 1:36 PM EDT | TSTM WND DMG | Grand Blanc, MI | REPORTS OF NUMEROUS TREES DOWN ACROSS GRAND BLANC. |
| Jun 29, 1:48 PM EDT | TSTM WND DMG | 4 S Grand Blanc, MI | MEDIA RECEIVED MULTIPLE REPORTS OF TREES DOWN IN GRAND BLANC AREA |
| Jun 29, 1:50 PM EDT | TSTM WND DMG | Atlas, MI | A SPOTTER REPORTED A LARGE TREE AND SEVERAL LARGE TREE LIMBS BLOWN DOWN. A SHED WAS ALSO DAMAGED AND HAD ITS ROOF BLOWN OFF. |
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, 5.1 hours before the alert went out and 50 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
- 681 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1064 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.3
The text
As transmitted.
358
WUUS53 KDTX 291706
SVRDTX
MIC049-093-125-155-291800-
/O.NEW.KDTX.SV.W.0021.210629T1706Z-210629T1800Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
106 PM EDT Tue Jun 29 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Northwestern Oakland County in southeastern Michigan...
Southern Shiawassee County in southeastern Michigan...
Northern Livingston County in southeastern Michigan...
Southern Genesee County in southeastern Michigan...
* Until 200 PM EDT.
* At 104 PM EDT, a severe thunderstorm was located near Perry, moving
east at 40 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...
Fowlerville around 110 PM EDT.
Bancroft around 115 PM EDT.
Cohoctah and Oak Grove around 120 PM EDT.
Other locations in the path of this severe thunderstorm include
Byron, Gaines, Linden, Fenton, Lake Fenton and Holly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Damaging winds and continuous cloud to ground lightning is occurring
with this storm. 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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4288 8435 4303 8347 4267 8346 4262 8414
4277 8416 4278 8432
TIME...MOT...LOC 1704Z 262DEG 33KT 4275 8416
HAIL...1.00IN
WIND...60MPH
$$
AA2 follow-up statements
178
WWUS53 KDTX 291720
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
120 PM EDT Tue Jun 29 2021
MIC049-093-125-155-291800-
/O.CON.KDTX.SV.W.0021.000000T0000Z-210629T1800Z/
Oakland MI-Shiawassee MI-Livingston MI-Genesee MI-
120 PM EDT Tue Jun 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHWESTERN OAKLAND...SOUTHEASTERN SHIAWASSEE...NORTHERN
LIVINGSTON AND SOUTHERN GENESEE COUNTIES...
At 119 PM EDT, a severe thunderstorm was located over Byron, or 8
miles southeast of Durand, moving east at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Linden around 125 PM EDT.
Other locations in the path of this severe thunderstorm include
Fenton, Holly, Lake Fenton, Grand Blanc and Goodrich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4288 8409 4301 8347 4293 8347 4272 8346
4270 8405
TIME...MOT...LOC 1719Z 255DEG 43KT 4282 8390
HAIL...1.00IN
WIND...60MPH
$$
AA369
WWUS53 KDTX 291736
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
136 PM EDT Tue Jun 29 2021
MIC155-291745-
/O.CAN.KDTX.SV.W.0021.000000T0000Z-210629T1800Z/
Shiawassee MI-
136 PM EDT Tue Jun 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SHIAWASSEE COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has
moved out of the warned area. Therefore, the warning has been
cancelled.
LAT...LON 4301 8347 4293 8347 4272 8346 4271 8378
4293 8387
TIME...MOT...LOC 1735Z 259DEG 33KT 4286 8370
$$
MIC049-093-125-291800-
/O.CON.KDTX.SV.W.0021.000000T0000Z-210629T1800Z/
Oakland MI-Livingston MI-Genesee MI-
136 PM EDT Tue Jun 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHWESTERN OAKLAND...NORTHEASTERN LIVINGSTON AND SOUTHERN
GENESEE COUNTIES...
At 135 PM EDT, a severe thunderstorm was located over Lake Fenton, or
near Fenton, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
Holly around 140 PM EDT.
Grand Blanc around 145 PM EDT.
Goodrich around 150 PM EDT.
Other locations impacted by this severe thunderstorm include Atlas,
Davisburg, Rankin, Holly State Recreation Area, Rose Center, Tyrone
Township and Argentine.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4301 8347 4293 8347 4272 8346 4271 8378
4293 8387
TIME...MOT...LOC 1735Z 259DEG 33KT 4286 8370
HAIL...1.00IN
WIND...60MPH
$$
AAThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 8:10 PM EDT | Special Weather Statement | DTX | Washtenaw | 50 min |
| Jun 28, 8:15 PM EDT | Special Weather Statement | DTX | Wayne | 60 min |
| Jun 28, 8:51 PM EDT | Special Weather Statement | DTX | Washtenaw | 39 min |
| Jun 28, 9:09 PM EDT | Special Weather Statement | DTX | Macomb, Saint Clair | 66 min |
| Jun 29, 4:24 AM EDT | Special Weather Statement | DTX | Livingston, Oakland | 66 min |
| Jun 29, 12:48 PM EDT | Special Weather Statement | DTX | Livingston, Shiawassee, Washtenaw | 57 min |
| Jun 29, 1:38 PM EDT | Special Weather Statement | DTX | Livingston, Washtenaw | 97 min |
| Jun 29, 1:55 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Lapeer, Oakland | 38 min |
| Jun 29, 2:02 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 58 min |
| Jun 29, 2:30 PM EDT | Special Weather Statement | DTX | Macomb, Monroe, Oakland, Saint Clair, Wayne | 60 min |
| Jun 29, 2:56 PM EDT | Special Marine Warning | DTX | 70 min | |
| Jun 29, 3:04 PM EDT | Special Marine Warning | DTX | 56 min | |
| Jun 29, 3:09 PM EDT | Areal Flood Advisory | DTX | Macomb, Oakland, Wayne | 90 min |
| Jun 29, 3:09 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Wayne | 23 min |
| Jun 29, 3:28 PM EDT | Areal Flood Advisory | DTX | Saint Clair | 73 min |
| Jun 29, 5:58 PM EDT | Special Marine Warning | DTX | 77 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.