Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 64, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 9, 2021, 1:49 PM EDT for Livingston County, Oakland County, Washtenaw County, Michigan. It was in force for 30 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
- Aug 9, 2021, 1:49 PM EDT (17:49 UTC)
- Expired
- Aug 9, 2021, 2:19 PM EDT
- In force
- 30 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Livingston County, MI, Oakland County, MI, Washtenaw County, MI
The radar
The Detroit radar (KDTX), 34 km from the middle of the area, began a volume at 17:52 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 9, 1:52 PM EDT | TSTM WND DMG | 3 N South Lyon, MI | REPORT OF A TREE DOWN. |
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, 5.8 hours before the alert went out and 38 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
- 515 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 948 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.3
The text
As transmitted.
191 WUUS53 KDTX 091749 SVRDTX MIC093-125-161-091845- /O.NEW.KDTX.SV.W.0064.210809T1749Z-210809T1845Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Detroit/Pontiac MI 149 PM EDT Mon Aug 9 2021 The National Weather Service in Detroit/Pontiac has issued a * Severe Thunderstorm Warning for... Southwestern Oakland County in southeastern Michigan... Southeastern Livingston County in southeastern Michigan... Northeastern Washtenaw County in southeastern Michigan... * Until 245 PM EDT. * At 149 PM EDT, a severe thunderstorm was located over Whitmore Lake, or 7 miles south of Brighton, moving north at 30 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... South Lyon around 200 PM EDT. Brighton around 205 PM EDT. Milford around 215 PM EDT. Hartland around 220 PM EDT. Other locations impacted by this severe thunderstorm include Lakeland, White Lake, Island Lake State Recreation Area, Chilson, Delhi Mills, New Hudson, Barton Hills and Wixom. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Large hail and 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 4228 8362 4231 8389 4269 8388 4267 8349 TIME...MOT...LOC 1749Z 198DEG 27KT 4242 8373 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ IRL
4 follow-up statements
103
WWUS53 KDTX 091755
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
155 PM EDT Mon Aug 9 2021
MIC161-091805-
/O.CAN.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/
Washtenaw MI-
155 PM EDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WASHTENAW COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4269 8388 4267 8349 4243 8357 4243 8389
TIME...MOT...LOC 1755Z 198DEG 27KT 4247 8371
$$
MIC093-125-091845-
/O.CON.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/
Oakland MI-Livingston MI-
155 PM EDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHWESTERN OAKLAND AND SOUTHEASTERN LIVINGSTON COUNTIES...
At 155 PM EDT, a severe thunderstorm was located near South Lyon, or
near Brighton, moving north at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe storm will be near...
Brighton around 205 PM EDT.
Milford around 215 PM EDT.
Hartland around 220 PM EDT.
Other locations impacted by this severe thunderstorm include Island
Lake State Recreation Area, Chilson, New Hudson, Lakeland, White Lake
and Wixom.
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 4269 8388 4267 8349 4243 8357 4243 8389
TIME...MOT...LOC 1755Z 198DEG 27KT 4247 8371
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
IRL431 WWUS53 KDTX 091801 SVSDTX Severe Weather Statement National Weather Service Detroit/Pontiac MI 201 PM EDT Mon Aug 9 2021 MIC093-125-091845- /O.CON.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/ Oakland MI-Livingston MI- 201 PM EDT Mon Aug 9 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT FOR SOUTHWESTERN OAKLAND AND SOUTHEASTERN LIVINGSTON COUNTIES... At 201 PM EDT, a severe thunderstorm was located near South Lyon, or near Milford, moving north at 30 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe storm will be near... Milford around 215 PM EDT. Other locations impacted by this severe thunderstorm include Island Lake State Recreation Area, New Hudson, White Lake and Wixom. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4268 8373 4267 8349 4243 8357 4245 8382 TIME...MOT...LOC 1801Z 201DEG 27KT 4251 8366 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ IRL
013
WWUS53 KDTX 091810
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
210 PM EDT Mon Aug 9 2021
MIC093-091820-
/O.CAN.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/
Livingston MI-
210 PM EDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON 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 4267 8349 4249 8355 4251 8367 4268 8368
TIME...MOT...LOC 1810Z 203DEG 29KT 4259 8357
$$
MIC125-091845-
/O.CON.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/
Oakland MI-
210 PM EDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHWESTERN OAKLAND COUNTY...
At 210 PM EDT, a severe thunderstorm was located over Milford, moving
northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
southwestern Oakland County, including the following locations... New
Hudson, White Lake and Wixom.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4267 8349 4249 8355 4251 8367 4268 8368
TIME...MOT...LOC 1810Z 203DEG 29KT 4259 8357
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
IRL664
WWUS53 KDTX 091819
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
219 PM EDT Mon Aug 9 2021
MIC125-091828-
/O.CAN.KDTX.SV.W.0064.000000T0000Z-210809T1845Z/
Oakland MI-
219 PM EDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN OAKLAND COUNTY IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However gusty winds are
still possible with this thunderstorm. A Special Weather Statement
is in effect until 3 PM for portions of Oakland County for wind
gusts to 50 mph.
LAT...LON 4267 8349 4249 8355 4251 8367 4268 8368
TIME...MOT...LOC 1814Z 198DEG 27KT 4265 8354
$$
IRLThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:29 PM EDT | Special Weather Statement | DTX | Livingston, Washtenaw | 46 min |
| Aug 9, 2:08 PM EDT | Special Weather Statement | DTX | Wayne | 67 min |
| Aug 9, 2:18 PM EDT | Special Weather Statement | DTX | Oakland | 42 min |
| Aug 9, 3:11 PM EDT | Special Marine Warning | DTX | 76 min | |
| Aug 9, 3:12 PM EDT | Areal Flood Advisory | DTX | Macomb, Oakland, Wayne | 101 min |
| Aug 9, 3:13 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Wayne | 44 min |
| Aug 9, 3:34 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 56 min |
| Aug 9, 3:48 PM EDT | Special Weather Statement | DTX | Sanilac | 57 min |
| Aug 9, 3:59 PM EDT | Special Marine Warning | DTX | 62 min | |
| Aug 9, 4:09 PM EDT | Special Weather Statement | DTX | Huron | 51 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.