Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Detroit, MI

July 8, 2021Macomb County, Wayne County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 8, 2021, 4:44 PM EDT for Macomb County, Wayne County, Michigan. It was in force for 31 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: Jul 8, 2021, 4:44 PM EDT (20:44 UTC)
Expired: Jul 8, 2021, 5:15 PM EDT
In force: 31 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Macomb County, MI, Wayne County, MI

The radar

The Detroit radar (KDTX), 56 km from the middle of the area, began a volume at 20:47 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
Jul 8, 4:55 PM EDT	TSTM WND DMG	3 Nw Grosse Pointe, MI	THUNDERSTORM WINDS DAMAGED POWER EQUIPMENT NEAR THE INTERSECTION OF MOROSS RD AND BEACONSFIELD ST IN HARPER WOODS.

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, 8.7 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 200 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

512 
WUUS53 KDTX 082044
SVRDTX
MIC099-163-082115-
/O.NEW.KDTX.SV.W.0039.210708T2044Z-210708T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
444 PM EDT Thu Jul 8 2021

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Northeastern Wayne County in southeastern Michigan...
  South central Macomb County in southeastern Michigan...

* Until 515 PM EDT.

* At 444 PM EDT, a severe thunderstorm was located near Grosse
  Pointe, moving east at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  northeastern Wayne and south central Macomb Counties, including the
  following locations... Harper Woods, Grosse Pointe Shores, Grosse
  Pointe Woods, Grosse Pointe Park, Grosse Pointe Farms, Eastpointe
  and Roseville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4235 8295 4245 8298 4254 8288 4245 8286
      4238 8288 4236 8291
TIME...MOT...LOC 2044Z 249DEG 17KT 4243 8288 

HAIL...1.00IN
WIND...60MPH
 
$$

KK

3 follow-up statements

853 
WWUS53 KDTX 082057
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
457 PM EDT Thu Jul 8 2021

MIC099-163-082115-
/O.CON.KDTX.SV.W.0039.000000T0000Z-210708T2115Z/
Wayne MI-Macomb MI-
457 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN WAYNE AND SOUTH CENTRAL MACOMB COUNTIES...

At 457 PM EDT, a severe thunderstorm was located near Grosse Pointe 
Woods, moving east at 10 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
St. Clair Shores, Grosse Pointe, Roseville, Eastpointe, Grosse Pointe
Woods, Harper Woods, Grosse Pointe Park, Grosse Pointe Farms and
Grosse Pointe Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4235 8295 4245 8298 4254 8288 4245 8286
      4238 8288 4236 8291
TIME...MOT...LOC 2057Z 260DEG 10KT 4243 8288 

HAIL...1.00IN
WIND...60MPH
 
$$

KK

735 
WWUS53 KDTX 082104
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
504 PM EDT Thu Jul 8 2021

MIC099-163-082115-
/O.CON.KDTX.SV.W.0039.000000T0000Z-210708T2115Z/
Wayne MI-Macomb MI-
504 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN WAYNE AND SOUTHERN MACOMB COUNTIES...

At 504 PM EDT, a severe thunderstorm was located over Grosse Pointe,
moving southeast at 10 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Grosse Pointe, Grosse Pointe Woods, Harper Woods, Grosse Pointe Park,
Grosse Pointe Farms and Grosse Pointe Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4235 8295 4245 8298 4245 8286 4238 8288
      4236 8291
TIME...MOT...LOC 2104Z 305DEG 7KT 4241 8292 

HAIL...<.75IN
WIND...60MPH
 
$$

KK

802 
WWUS53 KDTX 082115
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
515 PM EDT Thu Jul 8 2021

MIC099-163-082122-
/O.EXP.KDTX.SV.W.0039.000000T0000Z-210708T2115Z/
Wayne MI-Macomb MI-
515 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WAYNE AND
SOUTHERN MACOMB COUNTIES WILL EXPIRE AT 515 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 4235 8295 4245 8298 4245 8286 4238 8288
      4236 8291
TIME...MOT...LOC 2112Z 249DEG 17KT 4242 8289 

$$

KK

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 9:10 PM EDT	Special Marine Warning	DTX		35 min
Jul 7, 9:21 PM EDT	Special Weather Statement	DTX	Huron	39 min
Jul 8, 3:13 AM EDT	Special Weather Statement	DTX	Shiawassee	47 min
Jul 8, 4:46 AM EDT	Special Weather Statement	DTX	Washtenaw	44 min
Jul 8, 5:37 AM EDT	Special Weather Statement	DTX	Oakland	38 min
Jul 8, 8:43 AM EDT	Special Weather Statement	DTX	Livingston	47 min
Jul 8, 2:59 PM EDT	Special Weather Statement	DTX	Wayne	46 min
Jul 8, 3:13 PM EDT	Special Weather Statement	DTX	Monroe	62 min
Jul 8, 3:29 PM EDT	Special Weather Statement	DTX	Oakland	76 min
Jul 8, 3:56 PM EDT	Special Marine Warning	DTX		34 min
Jul 8, 4:34 PM EDT	Special Weather Statement	DTX	Wayne	26 min
Jul 8, 4:46 PM EDT	Special Marine Warning	DTX		59 min
Jul 8, 5:08 PM EDT	Special Weather Statement	DTX	Wayne	37 min
Jul 8, 6:53 PM EDT	Areal Flood Advisory	DTX	Wayne	112 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2021 Every 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.