Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 84, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 24, 2021, 7:30 PM EDT for Genesee County, 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 24, 2021, 7:30 PM EDT (23:30 UTC)
- Expired
- Aug 24, 2021, 8:15 PM EDT
- In force
- 45 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Genesee County, MI
The radar
The Detroit radar (KDTX), 36 km from the middle of the area, began a volume at 23:33 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 24, 7:52 PM EDT | TSTM WND DMG | 2 Ssw Flint, MI | LARGE TREE BRANCH APPROXIMATELY 8 INCH DIAMETER DOWN IN NORTHEAST CORNER OF BROOME PARK |
| Aug 24, 7:55 PM EDT | TSTM WND DMG | 6 S Flint, MI | REPORT OF A TREE DOWN BLOCKING TRAFFIC ON VAN SLYKE AND W HILL ROAD |
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, 11.5 hours before the alert went out and 36 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
- 298 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1140 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
613
WUUS53 KDTX 242330
SVRDTX
MIC049-250015-
/O.NEW.KDTX.SV.W.0084.210824T2330Z-210825T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
730 PM EDT Tue Aug 24 2021
The National Weather Service in Detroit/Pontiac has issued a
* Severe Thunderstorm Warning for...
Genesee County in southeastern Michigan...
* Until 815 PM EDT.
* At 730 PM EDT, severe thunderstorms were located along a line
extending from Montrose to near Swartz Creek to 6 miles southeast
of Morrice, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Swartz Creek and Montrose around 735 PM EDT.
Clio, Mount Morris and Beecher around 740 PM EDT.
Grand Blanc around 750 PM EDT.
Fenton, Burton, Linden and Otisville around 755 PM EDT.
Davison, Otter Lake and Lake Fenton around 800 PM EDT.
Goodrich around 815 PM EDT.
Other locations impacted by these severe thunderstorms include Atlas,
Thetford Township, Argentine, Rankin and Genesee.
People attending Ally Golf Tournament 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 4322 8346 4288 8345 4287 8369 4278 8369
4278 8392 4322 8393
TIME...MOT...LOC 2330Z 259DEG 35KT 4319 8388 4292 8388 4278 8408
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DG2 follow-up statements
240
WWUS53 KDTX 242355
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
755 PM EDT Tue Aug 24 2021
MIC049-250015-
/O.CON.KDTX.SV.W.0084.000000T0000Z-210825T0015Z/
Genesee MI-
755 PM EDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR GENESEE COUNTY...
At 755 PM EDT, severe thunderstorms were located along a line
extending from near Millington to near Grand Blanc to Linden, moving
east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Davison and Otisville around 800 PM EDT.
Otter Lake around 805 PM EDT.
Goodrich around 815 PM EDT.
Other locations impacted by these severe thunderstorms include Atlas,
Thetford Township, Argentine, Rankin and Genesee.
People attending Ally Golf Tournament should seek safe shelter
immediately!
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4322 8346 4288 8345 4287 8369 4278 8369
4278 8392 4314 8393
TIME...MOT...LOC 2355Z 259DEG 35KT 4323 8359 4296 8359 4282 8379
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Mann444
WWUS53 KDTX 250016
SVSDTX
Severe Weather Statement
National Weather Service Detroit/Pontiac MI
816 PM EDT Tue Aug 24 2021
MIC049-250026-
/O.EXP.KDTX.SV.W.0084.000000T0000Z-210825T0015Z/
Genesee MI-
816 PM EDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR GENESEE COUNTY HAS EXPIRED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
LAT...LON 4322 8346 4288 8345 4287 8369 4278 8369
4278 8392 4314 8393
TIME...MOT...LOC 0016Z 259DEG 35KT 4323 8359 4296 8359 4282 8379
$$
MannThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 6:01 PM EDT | Special Weather Statement | DTX | Bay, Midland, Saginaw | 89 min |
| Aug 24, 6:07 PM EDT | Severe Thunderstorm Warning | DTX | Midland | 53 min |
| Aug 24, 6:38 PM EDT | Special Weather Statement | DTX | Bay, Saginaw | 52 min |
| Aug 24, 6:42 PM EDT | Special Marine Warning | DTX | 93 min | |
| Aug 24, 6:47 PM EDT | Severe Thunderstorm Warning | DTX | Bay | 28 min |
| Aug 24, 6:52 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 53 min |
| Aug 24, 7:08 PM EDT | Special Weather Statement | DTX | Shiawassee | 67 min |
| Aug 24, 7:13 PM EDT | Severe Thunderstorm Warning | DTX | Shiawassee | 62 min |
| Aug 24, 7:45 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 35 min |
| Aug 24, 7:52 PM EDT | Special Weather Statement | DTX | Huron, Sanilac | 53 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.