Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 37, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Jul 7, 2021, 4:18 PM EDT for Oakland County, Michigan. It was in force for 57 min. 6 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
- Jul 7, 2021, 4:18 PM EDT (20:18 UTC)
- Expired
- Jul 7, 2021, 5:15 PM EDT
- In force
- 57 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Oakland County, MI
The radar
The Detroit radar (KDTX), 18 km from the middle of the area, began a volume at 20:22 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 |
|---|---|---|---|
| Jul 7, 4:45 PM EDT | TSTM WND DMG | 3 E Novi, MI | STATE POLICE REPORTING WIRES DOWN ACROSS BOTH DIRECTIONS OF I-275 NEAR GRAND RIVER. SOME WIRES DOWN ON CARS. |
| Jul 7, 4:47 PM EDT | TSTM WND DMG | 1 Nne Novi, MI | MULTIPLE TREE LIMBS DOWNED NEAR NOVI AND 12 MILE ROADS. |
| Jul 7, 4:49 PM EDT | TSTM WND DMG | 2 N Farmington, MI | SPOTTER REPORTS MULTIPLE TREES DOWN BLOCKING ROADWAYS ACROSS THE AREA. SOME ROADS WERE IMPASSIBLE. |
| Jul 7, 4:49 PM EDT | TSTM WND DMG | 3 E Novi, MI | MULTIPLE LARGE TREES UPROOTED. |
| Jul 7, 4:49 PM EDT | TSTM WND DMG | Farmington, MI | SOCIAL MEDIA PICTURES OF MULTIPLE LARGE TREE LIMBS DOWN IN DOWNTOWN FARMINGTON. |
| Jul 7, 4:58 PM EDT | TSTM WND DMG | 2 W Beverly Hills, MI | SOCIAL MEDIA PICTURES OF MULTIPLE APPROX 5 INCH DIAMETER TREE LIMBS DOWN. |
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 |
|---|---|---|---|
| Jul 7, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.3 hours before the alert went out and 20 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
- 1092 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 779 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.2
The text
As transmitted.
682
WUUS53 KDTX 072018
SVRDTX
MIC125-072115-
/O.NEW.KDTX.SV.W.0037.210707T2018Z-210707T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
418 PM EDT Wed Jul 7 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Southern Oakland County in southeastern Michigan...
* Until 515 PM EDT.
* At 417 PM EDT, a severe thunderstorm was located near Brighton,
moving east at 35 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...
South Lyon around 425 PM EDT.
Milford around 430 PM EDT.
Northville around 440 PM EDT.
Novi around 445 PM EDT.
West Bloomfield around 450 PM EDT.
Southfield and Birmingham around 505 PM EDT.
Troy, Royal Oak and Detroit Zoo around 510 PM EDT.
Warren around 515 PM EDT.
Other locations impacted by this severe thunderstorm include
Franklin, Keego Harbor, Waterford, Orchard Lake, Commerce, Lathrup
Village, Auburn Hills, Bingham Farms, Lake Angelus and Farmington
Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4243 8366 4263 8368 4274 8310 4245 8308
TIME...MOT...LOC 2017Z 263DEG 31KT 4250 8374
HAIL...1.00IN
WIND...60MPH
$$
DG3 follow-up statements
962
WWUS53 KDTX 072040
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
440 PM EDT Wed Jul 7 2021
MIC125-072115-
/O.CON.KDTX.SV.W.0037.000000T0000Z-210707T2115Z/
Oakland MI-
440 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHERN OAKLAND COUNTY...
At 440 PM EDT, a severe thunderstorm was located near Novi, moving
east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe storm will be near...
West Bloomfield around 450 PM EDT.
Birmingham around 505 PM EDT.
Southfield, Royal Oak and Detroit Zoo around 510 PM EDT.
Troy around 515 PM EDT.
Other locations impacted by this severe thunderstorm include
Franklin, Keego Harbor, Waterford, Orchard Lake, Commerce, Lathrup
Village, Auburn Hills, Bingham Farms, Lake Angelus and Farmington
Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4243 8366 4263 8368 4274 8310 4245 8308
TIME...MOT...LOC 2040Z 263DEG 28KT 4252 8351
HAIL...1.00IN
WIND...60MPH
$$
IRL451
WWUS53 KDTX 072051
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
451 PM EDT Wed Jul 7 2021
MIC125-072115-
/O.CON.KDTX.SV.W.0037.000000T0000Z-210707T2115Z/
Oakland MI-
451 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHERN OAKLAND COUNTY...
At 451 PM EDT, a severe thunderstorm was located over West
Bloomfield, or near Novi, moving east at 35 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...
Southfield and Birmingham around 505 PM EDT.
Royal Oak and Detroit Zoo around 510 PM EDT.
Troy around 515 PM EDT.
Other locations impacted by this severe thunderstorm include
Franklin, Keego Harbor, Waterford, Orchard Lake, Commerce, Lathrup
Village, Auburn Hills, Bingham Farms, Lake Angelus and Farmington
Hills.
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 4244 8351 4265 8356 4274 8310 4245 8308
TIME...MOT...LOC 2051Z 263DEG 31KT 4253 8338
HAIL...1.00IN
WIND...60MPH
$$
IRL532
WWUS53 KDTX 072115
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
515 PM EDT Wed Jul 7 2021
MIC125-072125-
/O.EXP.KDTX.SV.W.0037.000000T0000Z-210707T2115Z/
Oakland MI-
515 PM EDT Wed Jul 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN OAKLAND COUNTY HAS
EXPIRED...
The storm which prompted the warning is moing out of the area.
Therefore, the warning has been allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southeastern Michigan.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Detroit/Pontiac.
LAT...LON 4244 8351 4265 8356 4274 8310 4245 8308
TIME...MOT...LOC 2115Z 268DEG 24KT 4251 8312
$$
KKThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 8:06 PM EDT | Special Weather Statement | DTX | Saint Clair | 54 min |
| Jul 6, 8:07 PM EDT | Special Marine Warning | DTX | 53 min | |
| Jul 6, 8:26 PM EDT | Special Marine Warning | DTX | 79 min | |
| Jul 6, 9:22 PM EDT | Special Weather Statement | DTX | Saginaw | 53 min |
| Jul 6, 9:31 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 25 min |
| Jul 6, 9:37 PM EDT | Special Marine Warning | DTX | 21 min | |
| Jul 6, 9:45 PM EDT | Severe Thunderstorm Warning | DTX | Huron | 41 min |
| Jul 6, 10:13 PM EDT | Special Weather Statement | DTX | Oakland | 62 min |
| Jul 6, 10:16 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Tuscola | 45 min |
| Jul 6, 10:49 PM EDT | Severe Thunderstorm Warning | DTX | Sanilac | 32 min |
| Jul 6, 10:51 PM EDT | Special Weather Statement | DTX | Oakland | 24 min |
| Jul 6, 11:00 PM EDT | Special Weather Statement | DTX | Saginaw | 30 min |
| Jul 7, 3:38 AM EDT | Small Craft Advisory | DTX | 24 hr | |
| Jul 7, 12:35 PM EDT | Special Weather Statement | DTX | Huron | 70 min |
| Jul 7, 1:43 PM EDT | Special Weather Statement | DTX | Huron | 47 min |
| Jul 7, 1:49 PM EDT | Severe Thunderstorm Warning | DTX | Shiawassee | 41 min |
| Jul 7, 1:54 PM EDT | Special Weather Statement | DTX | Livingston | 51 min |
| Jul 7, 2:08 PM EDT | Special Weather Statement | DTX | Lenawee | 52 min |
| Jul 7, 2:24 PM EDT | Special Marine Warning | DTX | 48 min | |
| Jul 7, 2:39 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 50 min |
| Jul 7, 2:41 PM EDT | Special Marine Warning | DTX | 65 min | |
| Jul 7, 2:47 PM EDT | Special Weather Statement | DTX | Oakland | 43 min |
| Jul 7, 2:47 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Oakland | 58 min |
| Jul 7, 2:53 PM EDT | Special Weather Statement | DTX | Saint Clair | 37 min |
| Jul 7, 2:54 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 46 min |
| Jul 7, 3:10 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 65 min |
| Jul 7, 3:11 PM EDT | Special Marine Warning | DTX | 105 min | |
| Jul 7, 3:26 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 49 min |
| Jul 7, 3:38 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Washtenaw | 67 min |
| Jul 7, 3:51 PM EDT | Special Weather Statement | DTX | Oakland | 84 min |
| Jul 7, 4:15 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 30 min |
| Jul 7, 5:07 PM EDT | Special Weather Statement | DTX | Wayne | 53 min |
| Jul 7, 5:08 PM EDT | Special Marine Warning | DTX | 68 min | |
| Jul 7, 5:09 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 51 min |
| Jul 7, 5:31 PM EDT | Areal Flood Advisory | DTX | Macomb, Oakland | 112 min |
| Jul 7, 5:44 PM EDT | Special Weather Statement | DTX | Macomb | 31 min |
| Jul 7, 7:07 PM EDT | Special Weather Statement | DTX | Monroe | 53 min |
| Jul 7, 7:22 PM EDT | Areal Flood Advisory | DTX | Genesee | 99 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.