Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 99, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 29, 2021, 5:56 PM EDT for Oakland County, Michigan. It was in force for 64 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 29, 2021, 5:56 PM EDT (21:56 UTC)
- Expired
- Aug 29, 2021, 7:00 PM EDT
- In force
- 64 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Oakland County, MI
The radar
The Detroit radar (KDTX), 6 km from the middle of the area, began a volume at 21:55 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 29, 6:36 PM EDT | TSTM WND DMG | 4 Nne Milford, MI | SEVERAL TREES REPORTED DOWN ACROSS MILFORD AND HIGHLAND TWP VIA CENTRAL DISPATCH. |
| Aug 29, 6:47 PM EDT | TSTM WND DMG | Walled Lake, MI | TREE DAMAGE REPORTED VIA CENTRAL DISPATCH. |
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 |
|---|---|---|---|
| Aug 29, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 9.9 hours before the alert went out and 8 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
- 1500 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 915 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -80 m²/s²
- 0-3 km storm-relative helicity
- -70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
776 WUUS53 KDTX 292156 SVRDTX MIC125-292300- /O.NEW.KDTX.SV.W.0099.210829T2156Z-210829T2300Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Detroit/Pontiac MI 556 PM EDT Sun Aug 29 2021 The National Weather Service in Detroit/Pontiac has issued a * Severe Thunderstorm Warning for... Oakland County in southeastern Michigan... * Until 700 PM EDT. * At 556 PM EDT, severe thunderstorms were located along a line extending from Lake Fenton to near Hartland to near Pinckney, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Severe thunderstorms will be near... Holly around 600 PM EDT. Milford and Ortonville around 615 PM EDT. Oxford around 630 PM EDT. Clarkston around 635 PM EDT. Pontiac and Novi around 645 PM EDT. West Bloomfield around 650 PM EDT. Troy around 655 PM EDT. Southfield, Royal Oak, Birmingham and Rochester around 700 PM EDT. Other locations impacted by these severe thunderstorms include Franklin, Keego Harbor, Waterford, Orchard Lake, Holly State Recreation Area, Commerce, Rose Center, Lathrup Village, Auburn Hills and Bingham Farms. People attending Meadow Brook Amphitheatre should seek safe shelter immediately! PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4249 8367 4287 8369 4289 8310 4249 8309 TIME...MOT...LOC 2156Z 265DEG 31KT 4285 8369 4267 8384 4248 8398 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Mann
4 follow-up statements
164 WWUS53 KDTX 292208 SVSDTX Severe Weather Statement National Weather Service Detroit/Pontiac MI 608 PM EDT Sun Aug 29 2021 MIC125-292300- /O.CON.KDTX.SV.W.0099.000000T0000Z-210829T2300Z/ Oakland MI- 608 PM EDT Sun Aug 29 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR OAKLAND COUNTY... At 608 PM EDT, severe thunderstorms were located along a line extending from near Holly to near Hartland to near Hamburg, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Milford and Holly around 615 PM EDT. Ortonville around 620 PM EDT. Oxford and Clarkston around 635 PM EDT. Pontiac and Novi around 645 PM EDT. West Bloomfield around 650 PM EDT. Rochester around 700 PM EDT. Southfield and Birmingham around 705 PM EDT. Troy and Royal Oak around 710 PM EDT. Other locations impacted by these severe thunderstorms include Franklin, Keego Harbor, Waterford, Orchard Lake, Holly State Recreation Area, Commerce, Rose Center, Lathrup Village, Auburn Hills and Bingham Farms. People attending Meadow Brook Amphitheatre should seek safe shelter immediately! PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4249 8367 4287 8369 4289 8310 4249 8309 TIME...MOT...LOC 2208Z 265DEG 31KT 4286 8357 4268 8372 4249 8386 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Behnke
850 WWUS53 KDTX 292224 SVSDTX Severe Weather Statement National Weather Service Detroit/Pontiac MI 624 PM EDT Sun Aug 29 2021 MIC125-292300- /O.CON.KDTX.SV.W.0099.000000T0000Z-210829T2300Z/ Oakland MI- 624 PM EDT Sun Aug 29 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR OAKLAND COUNTY... At 624 PM EDT, severe thunderstorms were located along a line extending from near Ortonville to near Clarkston to near South Lyon, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Oxford and Clarkston around 630 PM EDT. Pontiac around 645 PM EDT. West Bloomfield around 650 PM EDT. Southfield, Birmingham and Rochester around 700 PM EDT. Royal Oak around 705 PM EDT. Troy around 710 PM EDT. Other locations impacted by these severe thunderstorms include Franklin, Keego Harbor, Waterford, Orchard Lake, Holly State Recreation Area, Commerce, Rose Center, Lathrup Village, Auburn Hills and Bingham Farms. People attending Meadow Brook Amphitheatre should seek safe shelter immediately! PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4249 8367 4287 8369 4289 8310 4249 8309 TIME...MOT...LOC 2224Z 256DEG 31KT 4287 8336 4269 8351 4250 8365 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Behnke
451 WWUS53 KDTX 292238 SVSDTX Severe Weather Statement National Weather Service Detroit/Pontiac MI 638 PM EDT Sun Aug 29 2021 MIC125-292300- /O.CON.KDTX.SV.W.0099.000000T0000Z-210829T2300Z/ Oakland MI- 638 PM EDT Sun Aug 29 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR OAKLAND COUNTY... At 638 PM EDT, severe thunderstorms were located along a line extending from near Dryden to near Pontiac to near Novi, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Rochester around 655 PM EDT. Southfield and Birmingham around 700 PM EDT. Royal Oak around 705 PM EDT. Troy around 710 PM EDT. Other locations impacted by these severe thunderstorms include Franklin, Keego Harbor, Waterford, Orchard Lake, Commerce, Lathrup Village, Auburn Hills, Bingham Farms, Lake Angelus and White Lake. People attending Meadow Brook Amphitheatre should seek safe shelter immediately! PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4249 8367 4288 8351 4289 8310 4249 8309 TIME...MOT...LOC 2238Z 256DEG 31KT 4287 8316 4269 8331 4250 8345 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Behnke
874
WWUS53 KDTX 292300
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
700 PM EDT Sun Aug 29 2021
MIC125-292310-
/O.EXP.KDTX.SV.W.0099.000000T0000Z-210829T2300Z/
Oakland MI-
700 PM EDT Sun Aug 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR OAKLAND COUNTY HAS EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Michigan.
LAT...LON 4249 8367 4288 8351 4289 8310 4249 8309
TIME...MOT...LOC 2300Z 265DEG 31KT 4288 8292 4271 8307 4252 8321
$$
BehnkeThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 8:18 PM EDT | Special Weather Statement | DTX | Saginaw | 72 min |
| Aug 28, 8:22 PM EDT | Special Weather Statement | DTX | Saint Clair, Sanilac | 68 min |
| Aug 28, 10:00 PM EDT | Severe Thunderstorm Warning | DTX | Shiawassee | 20 min |
| Aug 28, 10:17 PM EDT | Special Weather Statement | DTX | Genesee | 28 min |
| Aug 29, 1:53 AM EDT | Special Weather Statement | DTX | Bay, Midland | 67 min |
| Aug 29, 2:16 AM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland | 44 min |
| Aug 29, 2:32 AM EDT | Special Marine Warning | DTX | 42 min | |
| Aug 29, 3:40 PM EDT | Special Weather Statement | DTX | Bay, Midland | 65 min |
| Aug 29, 3:54 PM EDT | Special Marine Warning | DTX | 108 min | |
| Aug 29, 4:07 PM EDT | Special Weather Statement | DTX | Saginaw, Shiawassee | 83 min |
| Aug 29, 4:30 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw, Shiawassee | 75 min |
| Aug 29, 4:38 PM EDT | Special Weather Statement | DTX | Huron | 67 min |
| Aug 29, 4:58 PM EDT | Severe Thunderstorm Warning | DTX | Huron | 62 min |
| Aug 29, 5:11 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Genesee, Tuscola | 79 min |
| Aug 29, 5:25 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 65 min |
| Aug 29, 5:32 PM EDT | Special Marine Warning | DTX | 118 min | |
| Aug 29, 5:58 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 62 min |
| Aug 29, 6:00 PM EDT | Severe Thunderstorm Warning | DTX | Huron | 59 min |
| Aug 29, 6:13 PM EDT | Severe Thunderstorm Warning | DTX | Sanilac | 77 min |
| Aug 29, 6:37 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 83 min |
| Aug 29, 6:45 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 75 min |
| Aug 29, 6:51 PM EDT | Special Marine Warning | DTX | 114 min | |
| Aug 29, 7:00 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw | 57 min |
| Aug 29, 7:23 PM EDT | Special Weather Statement | DTX | Monroe | 67 min |
| Aug 29, 7:29 PM EDT | Special Weather Statement | DTX | Wayne | 61 min |
| Aug 29, 7:30 PM EDT | Special Marine Warning | DTX | 68 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.