Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 38, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Jul 7, 2021, 5:09 PM EDT for Macomb County, Michigan. It was in force for 51 min. 1 report 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, 5:09 PM EDT (21:09 UTC)
- Expired
- Jul 7, 2021, 6:00 PM EDT
- In force
- 51 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Macomb County, MI
The radar
The Detroit radar (KDTX), 55 km from the middle of the area, began a volume at 21:11 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, 5:33 PM EDT | TSTM WND DMG | 3 Nw St. Clair Shores, MI | MULTIPLE REPORTS OF LARGE TREES AND 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, 9.2 hours before the alert went out and 52 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.
773
WUUS53 KDTX 072109
SVRDTX
MIC099-072200-
/O.NEW.KDTX.SV.W.0038.210707T2109Z-210707T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
509 PM EDT Wed Jul 7 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Southern Macomb County in southeastern Michigan...
* Until 600 PM EDT.
* At 508 PM EDT, a severe thunderstorm was located over Detroit Zoo,
or near Warren, moving east at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Warren around 515 PM EDT.
St. Clair Shores around 525 PM EDT.
Other locations impacted by this severe thunderstorm include Center
Line, Roseville, Clinton Township, Fraser, Utica, Eastpointe, Grosse
Pointe Shores, Harper Woods and Grosse Pointe Woods.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4264 8273 4264 8275 4263 8277 4261 8275
4254 8279 4253 8282 4247 8283 4245 8284
4245 8308 4262 8309 4268 8271
TIME...MOT...LOC 2108Z 265DEG 38KT 4248 8311
HAIL...0.75IN
WIND...60MPH
$$
DG4 follow-up statements
665
WWUS53 KDTX 072121
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
521 PM EDT Wed Jul 7 2021
MIC099-072200-
/O.CON.KDTX.SV.W.0038.000000T0000Z-210707T2200Z/
Macomb MI-
521 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHERN MACOMB COUNTY...
At 520 PM EDT, severe thunderstorms were located along a line
extending from Sterling Heights to near Warren to near Detroit Zoo,
moving east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Mount Clemens around 535 PM EDT.
St. Clair Shores around 540 PM EDT.
Other locations impacted by these severe thunderstorms include Center
Line, Roseville, Clinton Township, Fraser, Utica, Eastpointe, Grosse
Pointe Shores, Harper Woods and Grosse Pointe Woods.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 8273 4264 8275 4263 8277 4261 8275
4254 8279 4253 8282 4247 8283 4245 8284
4245 8308 4262 8309 4268 8271
TIME...MOT...LOC 2120Z 271DEG 28KT 4260 8304 4250 8307 4246 8311
HAIL...0.75IN
WIND...60MPH
$$
KK980
WWUS53 KDTX 072139
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
539 PM EDT Wed Jul 7 2021
MIC099-072200-
/O.CON.KDTX.SV.W.0038.000000T0000Z-210707T2200Z/
Macomb MI-
539 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHERN MACOMB COUNTY...
At 539 PM EDT, severe thunderstorms were located along a line
extending from near Mount Clemens to near St. Clair Shores to near
Warren, moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
New Baltimore around 555 PM EDT.
Other locations impacted by these severe thunderstorms include Center
Line, Roseville, Clinton Township, Fraser, Eastpointe, Grosse Pointe
Shores, Harper Woods and Grosse Pointe Woods.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 8273 4264 8275 4263 8277 4261 8275
4254 8279 4254 8281 4253 8282 4247 8283
4245 8284 4245 8303 4262 8301 4268 8272
TIME...MOT...LOC 2139Z 266DEG 23KT 4262 8284 4253 8288 4246 8297
HAIL...0.75IN
WIND...60MPH
$$
KK759
WWUS53 KDTX 072149
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
549 PM EDT Wed Jul 7 2021
MIC099-072200-
/O.CON.KDTX.SV.W.0038.000000T0000Z-210707T2200Z/
Macomb MI-
549 PM EDT Wed Jul 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN MACOMB COUNTY...
At 548 PM EDT, severe thunderstorms were located along a line
extending from near Mount Clemens to near St. Clair Shores to near
Grosse Pointe, moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
southeastern Macomb County, including the following locations...
Grosse Pointe Shores, Harper Woods, Roseville, Grosse Pointe Woods
and Eastpointe.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 8273 4264 8275 4263 8277 4261 8275
4254 8279 4254 8281 4253 8282 4247 8283
4245 8284 4245 8294 4262 8288 4268 8272
TIME...MOT...LOC 2148Z 270DEG 22KT 4259 8280 4252 8287 4245 8290
HAIL...0.75IN
WIND...60MPH
$$
KK453
WWUS53 KDTX 072158
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
558 PM EDT Wed Jul 7 2021
MIC099-072206-
/O.EXP.KDTX.SV.W.0038.000000T0000Z-210707T2200Z/
Macomb MI-
558 PM EDT Wed Jul 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MACOMB COUNTY
WILL EXPIRE AT 600 PM EDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
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 4264 8273 4264 8275 4263 8277 4261 8275
4254 8279 4254 8281 4253 8282 4247 8283
4245 8284 4245 8294 4262 8288 4268 8272
TIME...MOT...LOC 2156Z 265DEG 38KT 4260 8270 4253 8277 4246 8280
$$
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, 4:18 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 57 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, 5:31 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.