Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 72, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 11, 2021, 2:42 PM EDT for Livingston County, Michigan. It was in force for 63 min. 4 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 11, 2021, 2:42 PM EDT (18:42 UTC)
- Expired
- Aug 11, 2021, 3:45 PM EDT
- In force
- 63 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Livingston County, MI
The radar
The Detroit radar (KDTX), 33 km from the middle of the area, began a volume at 18:42 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 11, 3:08 PM EDT | TSTM WND DMG | Hamburg, MI | REPORTS OF MULTIPLE TREES AND POWER LINES DOWN RELAYED VIA SOCIAL MEDIA. |
| Aug 11, 3:12 PM EDT | TSTM WND DMG | 4 W Brighton, MI | LARGE TREE DOWN BLOCKING ROAD |
| Aug 11, 3:12 PM EDT | TSTM WND DMG | 4 W Brighton, MI | LARGE TREE DOWN BLOCKING ROAD NEAR CHILSON AND COON LAKE RD...CORRECTED TO INCLUDE CROSSROADS |
| Aug 11, 3:15 PM EDT | TSTM WND DMG | Hartland, MI | REPORTS FROM SEVERAL SOURCES OF NUMEROUS TREES DOWN NEAR HARTLAND. |
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 11, 2:32 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 6.7 hours before the alert went out and 37 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
- 106 J/kg
- Mixed-layer CIN
- -290 J/kg
- Mixed-layer LCL
- 1220 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
069 WUUS53 KDTX 111842 SVRDTX MIC093-111945- /O.NEW.KDTX.SV.W.0072.210811T1842Z-210811T1945Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Detroit/Pontiac MI 242 PM EDT Wed Aug 11 2021 The National Weather Service in Detroit/Pontiac has issued a * Severe Thunderstorm Warning for... Livingston County in southeastern Michigan... * Until 345 PM EDT. * At 240 PM EDT, a severe thunderstorm was located over Gregory, or 8 miles west of Pinckney, moving northeast at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * This severe thunderstorm will be near... Pinckney around 250 PM EDT. Howell around 300 PM EDT. Brighton around 310 PM EDT. Hartland around 320 PM EDT. Other locations impacted by this severe thunderstorm include Parkers Corners, Lakeland, Plainfield, Island Lake State Recreation Area, Chilson, Unadilla, Pinckney State Recreation Area, Conway Township, Hell and Tyrone Township. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4278 8369 4243 8366 4242 8414 4277 8416 TIME...MOT...LOC 1840Z 245DEG 30KT 4248 8411 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ KDK
2 follow-up statements
421 WWUS53 KDTX 111900 SVSDTX Severe Weather Statement National Weather Service Detroit/Pontiac MI 300 PM EDT Wed Aug 11 2021 MIC093-111945- /O.CON.KDTX.SV.W.0072.000000T0000Z-210811T1945Z/ Livingston MI- 300 PM EDT Wed Aug 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT FOR LIVINGSTON COUNTY... At 258 PM EDT, a severe thunderstorm was located near Pinckney, moving northeast at 50 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe storm will be near... Hamburg around 310 PM EDT. Brighton around 315 PM EDT. Hartland and South Lyon around 320 PM EDT. Additional storms extended eastward from Pinckney and northwest toward Fowlerville. Other locations impacted by this severe thunderstorm include Parkers Corners, Lakeland, Plainfield, Island Lake State Recreation Area, Chilson, Unadilla, Pinckney State Recreation Area, Conway Township, Hell and Tyrone Township. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4278 8369 4243 8366 4242 8414 4277 8416 TIME...MOT...LOC 1858Z 245DEG 41KT 4248 8401 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ BT
024
WWUS53 KDTX 111941
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
341 PM EDT Wed Aug 11 2021
MIC093-111950-
/O.EXP.KDTX.SV.W.0072.000000T0000Z-210811T1945Z/
Livingston MI-
341 PM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR LIVINGSTON COUNTY WILL EXPIRE
AT 345 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Michigan.
LAT...LON 4278 8369 4243 8366 4242 8414 4277 8416
TIME...MOT...LOC 1940Z 245DEG 30KT 4262 8359
$$
BTThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 11:43 PM EDT | Severe Thunderstorm Warning | DTX | Bay, Midland, Saginaw | 62 min |
| Aug 10, 11:53 PM EDT | Special Weather Statement | DTX | Genesee, Livingston, Shiawassee, Washtenaw | 52 min |
| Aug 10, 11:58 PM EDT | Special Marine Warning | DTX | 92 min | |
| Aug 11, 12:02 AM EDT | Severe Thunderstorm Warning | DTX | Genesee, Livingston, Oakland, Shiawassee, Washtenaw | 58 min |
| Aug 11, 12:43 AM EDT | Severe Thunderstorm Warning | DTX | Bay, Huron, Saginaw, Tuscola | 47 min |
| Aug 11, 1:09 AM EDT | Special Marine Warning | DTX | 81 min | |
| Aug 11, 1:11 AM EDT | Special Weather Statement | DTX | Huron | 49 min |
| Aug 11, 1:29 AM EDT | Special Marine Warning | DTX | 46 min | |
| Aug 11, 4:04 AM EDT | Heat Advisory | DTX | Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw and 1 more | 13 hr |
| Aug 11, 2:22 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Washtenaw | 68 min |
| Aug 11, 2:31 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 42 min |
| Aug 11, 2:59 PM EDT | Severe Thunderstorm Warning | DTX | Monroe, Wayne | 76 min |
| Aug 11, 3:02 PM EDT | Special Weather Statement | DTX | Genesee | 58 min |
| Aug 11, 3:09 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 66 min |
| Aug 11, 3:16 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Shiawassee | 59 min |
| Aug 11, 3:17 PM EDT | Special Marine Warning | DTX | 88 min | |
| Aug 11, 3:36 PM EDT | Special Marine Warning | DTX | 84 min | |
| Aug 11, 3:36 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb, Saint Clair, Sanilac | 69 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.