Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 78, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 12, 2021, 7:09 AM EDT for 4 counties in Michigan. It was in force for 45 min. 2 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
- Aug 12, 2021, 7:09 AM EDT (11:09 UTC)
- Expired
- Aug 12, 2021, 7:54 AM EDT
- In force
- 45 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Macomb County, MI, Monroe County, MI, Oakland County, MI, Wayne County, MI
The radar
The Detroit radar (KDTX), 53 km from the middle of the area, began a volume at 11:13 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 |
|---|---|---|---|
| Aug 12, 7:15 AM EDT | TSTM WND DMG | 3 Ssw Canton, MI | 8 INCH DIAMTER TREE LIMB DOWN. |
| Aug 12, 7:24 AM EDT | TSTM WND DMG | 2 Wnw Romulus, MI | PUBLIC REPORT OF APPROX 6 INCH DIAMETER HEALTHY TREE LIMBS DOWN ALONG TYLER RD BETWEEN COGSWELL AND OZGA RDS. |
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 00:00Z, 11.2 hours before the alert went out and 54 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
- 12 J/kg
- Mixed-layer CIN
- -458 J/kg
- Mixed-layer LCL
- 1474 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
955
WUUS53 KDTX 121109
SVRDTX
MIC099-115-125-163-121215-
/O.NEW.KDTX.SV.W.0078.210812T1109Z-210812T1215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
709 AM EDT Thu Aug 12 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Northern Monroe County in southeastern Michigan...
Wayne County in southeastern Michigan...
Southeastern Oakland County in southeastern Michigan...
Southwestern Macomb County in southeastern Michigan...
* Until 815 AM EDT.
* At 708 AM EDT, a severe thunderstorm was located near Ypsilanti,
moving northeast at 65 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Romulus around 720 AM EDT.
Livonia, Taylor and Greenfield Village around 725 AM EDT.
Southfield, Detroit, Dearborn and Detroit Zoo around 730 AM EDT.
Warren, Downtown Detroit and Belle Isle around 735 AM EDT.
Grosse Pointe around 740 AM EDT.
St. Clair Shores around 745 AM EDT.
Other locations impacted by this severe thunderstorm include
Melvindale, Gibraltar, Roseville, New Boston, Rockwood, Harper Woods,
Pleasant Ridge, Westland, Grosse Pointe Shores and Ecorse.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4237 8288 4230 8309 4224 8313 4213 8312
4204 8315 4202 8377 4209 8354 4243 8355
4254 8287 4253 8282
TIME...MOT...LOC 1108Z 246DEG 58KT 4228 8358
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AM2 follow-up statements
750
WWUS53 KDTX 121132
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
732 AM EDT Thu Aug 12 2021
MIC115-121142-
/O.CAN.KDTX.SV.W.0078.000000T0000Z-210812T1215Z/
Monroe MI-
732 AM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MONROE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4237 8288 4234 8296 4232 8306 4230 8309
4213 8319 4212 8339 4246 8339 4254 8288
4253 8282
TIME...MOT...LOC 1132Z 249DEG 39KT 4234 8323
$$
MIC099-125-163-121215-
/O.CON.KDTX.SV.W.0078.000000T0000Z-210812T1215Z/
Wayne MI-Oakland MI-Macomb MI-
732 AM EDT Thu Aug 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM EDT
FOR WAYNE...SOUTHEASTERN OAKLAND AND SOUTHWESTERN MACOMB COUNTIES...
At 732 AM EDT, a severe thunderstorm was located over Dearborn, or 8
miles southeast of Livonia, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe storm will be near...
Detroit and Detroit Zoo around 740 AM EDT.
Downtown Detroit around 745 AM EDT.
Belle Isle around 750 AM EDT.
Grosse Pointe around 755 AM EDT.
St. Clair Shores around 805 AM EDT.
Other locations impacted by this severe thunderstorm include
Melvindale, Roseville, Harper Woods, Pleasant Ridge, Westland, Grosse
Pointe Shores, Ecorse, Center Line, Huntington 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 4237 8288 4234 8296 4232 8306 4230 8309
4213 8319 4212 8339 4246 8339 4254 8288
4253 8282
TIME...MOT...LOC 1132Z 249DEG 39KT 4234 8323
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AM864
WWUS53 KDTX 121154
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
754 AM EDT Thu Aug 12 2021
MIC099-125-163-121204-
/O.CAN.KDTX.SV.W.0078.000000T0000Z-210812T1215Z/
Wayne MI-Oakland MI-Macomb MI-
754 AM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR WAYNE...SOUTHEASTERN OAKLAND
AND SOUTHWESTERN MACOMB COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.
LAT...LON 4237 8288 4234 8296 4232 8306 4230 8309
4213 8319 4212 8339 4246 8339 4254 8288
4253 8282
TIME...MOT...LOC 1152Z 246DEG 58KT 4248 8279
$$
AMThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 10:42 PM EDT | Special Weather Statement | DTX | Genesee, Lapeer, Livingston, Oakland, Shiawassee | 63 min |
| Aug 11, 11:00 PM EDT | Special Weather Statement | DTX | Lenawee, Washtenaw | 60 min |
| Aug 11, 11:34 PM EDT | Special Weather Statement | DTX | Macomb, Monroe, Saint Clair, Wayne | 56 min |
| Aug 12, 12:47 AM EDT | Special Weather Statement | DTX | Tuscola | 43 min |
| Aug 12, 1:14 AM EDT | Special Weather Statement | DTX | Genesee, Shiawassee | 46 min |
| Aug 12, 2:04 AM EDT | Areal Flood Advisory | DTX | Livingston | 2 hr |
| Aug 12, 2:36 AM EDT | Special Weather Statement | DTX | Wayne | 54 min |
| Aug 12, 3:08 AM EDT | Areal Flood Advisory | DTX | Wayne | 4 hr |
| Aug 12, 4:33 AM EDT | Flash Flood Warning | DTX | Livingston | 2 hr |
| Aug 12, 5:18 AM EDT | Areal Flood Advisory | DTX | Macomb, Oakland | 3 hr |
| Aug 12, 5:41 AM EDT | Flash Flood Warning | DTX | Macomb, Oakland, Wayne | 3 hr |
| Aug 12, 6:31 AM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Livingston, Monroe, Washtenaw | 59 min |
| Aug 12, 6:43 AM EDT | Areal Flood Warning | DTX | Livingston | 2 hr |
| Aug 12, 7:18 AM EDT | Special Weather Statement | DTX | Monroe | 42 min |
| Aug 12, 7:27 AM EDT | Special Marine Warning | DTX | 34 min | |
| Aug 12, 7:35 AM EDT | River Flood Warning | DTX | Livingston | 18 days |
| Aug 12, 8:42 AM EDT | Areal Flood Advisory | DTX | Macomb, Oakland, Wayne | 3 hr |
| Aug 12, 11:53 AM EDT | River Flood Warning | DTX | Macomb | 7 hr |
| Aug 12, 6:08 PM EDT | River Flood Warning | DTX | Wayne | 15 hr |
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.