Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Detroit, MI

June 20, 2021Wayne County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jun 20, 2021, 9:12 PM EDT for Wayne County, Michigan. It was in force for 63 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
Jun 20, 2021, 9:12 PM EDT (01:12 UTC)
Expired
Jun 20, 2021, 10:15 PM EDT
In force
63 min
Issued by
NWS Detroit, MI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Wayne County, MI

The radar

The Detroit radar (KDTX), 58 km from the middle of the area, began a volume at 01:11 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

TimeReportWhereRemark
Jun 20, 9:19 PM EDTTSTM WND DMG2 N Grosse Ile, MILARGE TREE SNAPPED NEAR THE INTERSECTION OF MERIDIAN RD AND POTAWATOMI DR
Jun 20, 9:41 PM EDTTSTM WND DMG3 Sse Detroit, MITREE DOWN AND PARTIALLY BLOCKING RIGHT TURN LANE AT INTERSECTION OF MARTIN LUTHER KING JR BLVD AND JEFFRIES SERVICE DR. RELAYED VIA SOCIAL MEDIA PHOTO.

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.

IssuedProductOfficeLasted
Jun 20, 6:06 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 1.2 hours before the alert went out and 57 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-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 2021-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 133 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 2021-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
133 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
1501 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

314 
WUUS53 KDTX 210112
SVRDTX
MIC163-210215-
/O.NEW.KDTX.SV.W.0009.210621T0112Z-210621T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
912 PM EDT Sun Jun 20 2021

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Eastern Wayne County in southeastern Michigan...

* Until 1015 PM EDT.

* At 911 PM EDT, a severe thunderstorm was located over Grosse Ile,
  or near Flat Rock, moving northeast at 30 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 be near...
  Wyandotte around 930 PM EDT.
  Downtown Detroit and Detroit around 945 PM EDT.
  Belle Isle around 950 PM EDT.
  Grosse Pointe around 1000 PM EDT.

Other locations impacted by this severe thunderstorm include Highland
Park, Gibraltar, Riverview, Northeast Detroit, Harper Woods, Grosse
Pointe Shores, Ecorse, Southwest Detroit, Hamtramck and River Rouge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4243 8284 4236 8288 4232 8306 4229 8309
      4224 8313 4217 8313 4212 8312 4207 8314
      4207 8324 4245 8308 4245 8287 4246 8287
      4246 8283
TIME...MOT...LOC 0111Z 210DEG 25KT 4212 8315 

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

Mann
4 follow-up statements
327 
WWUS53 KDTX 210128
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
928 PM EDT Sun Jun 20 2021

MIC163-210215-
/O.CON.KDTX.SV.W.0009.000000T0000Z-210621T0215Z/
Wayne MI-
928 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR EASTERN WAYNE COUNTY...

At 927 PM EDT, a severe thunderstorm was located near Wyandotte, or
near Downtown Detroit, moving northeast at 30 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 storm will be near...
  Downtown Detroit around 940 PM EDT.
  Detroit and Belle Isle around 945 PM EDT.
  Grosse Pointe around 955 PM EDT.

Other locations impacted by this severe thunderstorm include Highland
Park, Gibraltar, Riverview, Northeast Detroit, Harper Woods, Grosse
Pointe Shores, Ecorse, Southwest Detroit, Hamtramck and River Rouge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4243 8284 4236 8288 4232 8306 4229 8309
      4224 8313 4217 8313 4212 8312 4207 8314
      4207 8324 4245 8308 4245 8287 4246 8287
      4246 8283
TIME...MOT...LOC 0127Z 207DEG 26KT 4223 8308 

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

TF
283 
WWUS53 KDTX 210140
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
940 PM EDT Sun Jun 20 2021

MIC163-210215-
/O.CON.KDTX.SV.W.0009.000000T0000Z-210621T0215Z/
Wayne MI-
940 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR EASTERN WAYNE COUNTY...

At 940 PM EDT, a severe thunderstorm was located over Downtown
Detroit, moving north at 30 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 storm will be near...
  Detroit and Belle Isle around 945 PM EDT.
  Grosse Pointe around 955 PM EDT.
  Warren around 1010 PM EDT.

Other locations impacted by this severe thunderstorm include Highland
Park, Gibraltar, Riverview, Northeast Detroit, Harper Woods, Grosse
Pointe Shores, Ecorse, Southwest Detroit, Hamtramck and River Rouge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4243 8284 4236 8288 4232 8306 4229 8309
      4224 8313 4217 8313 4212 8312 4207 8314
      4207 8324 4245 8308 4245 8287 4246 8287
      4246 8283
TIME...MOT...LOC 0140Z 199DEG 24KT 4232 8307 

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

TF
317 
WWUS53 KDTX 210156
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
956 PM EDT Sun Jun 20 2021

MIC163-210215-
/O.CON.KDTX.SV.W.0009.000000T0000Z-210621T0215Z/
Wayne MI-
956 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR EASTERN WAYNE COUNTY...

At 956 PM EDT, a severe thunderstorm was located near Grosse Pointe,
moving northeast 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...
  Warren around 1010 PM EDT.

Other locations impacted by this severe thunderstorm include Highland
Park, Gibraltar, Riverview, Northeast Detroit, Harper Woods, Grosse
Pointe Shores, Ecorse, Southwest Detroit, Hamtramck and River Rouge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4243 8284 4236 8288 4232 8306 4229 8309
      4224 8313 4217 8313 4212 8312 4207 8314
      4207 8324 4245 8308 4245 8287 4246 8287
      4246 8283
TIME...MOT...LOC 0156Z 204DEG 25KT 4241 8300 

HAIL...0.75IN
WIND...60MPH
 
$$

TF
388 
WWUS53 KDTX 210215
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1015 PM EDT Sun Jun 20 2021

MIC163-210225-
/O.EXP.KDTX.SV.W.0009.000000T0000Z-210621T0215Z/
Wayne MI-
1015 PM EDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WAYNE COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
southeastern Michigan.

LAT...LON 4243 8284 4236 8288 4232 8306 4229 8309
      4224 8313 4217 8313 4212 8312 4207 8314
      4207 8324 4245 8308 4245 8287 4246 8287
      4246 8283
TIME...MOT...LOC 0215Z 210DEG 25KT 4252 8291 

$$

TF

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 8:35 PM EDTSpecial Marine WarningDTX55 min
Jun 20, 8:45 PM EDTSpecial Weather StatementDTXWayne60 min
Jun 20, 8:53 PM EDTSevere Thunderstorm WarningDTXLenawee67 min
Jun 20, 9:02 PM EDTSevere Thunderstorm WarningDTXMonroe58 min
Jun 20, 9:20 PM EDTSpecial Marine WarningDTX85 min
Jun 20, 9:23 PM EDTSpecial Marine WarningDTX45 min
Jun 20, 9:34 PM EDTSevere Thunderstorm WarningDTXLivingston, Shiawassee44 min
Jun 20, 9:42 PM EDTSevere Thunderstorm WarningDTXLenawee, Monroe, Washtenaw, Wayne63 min
Jun 20, 9:56 PM EDTSpecial Weather StatementDTXMacomb64 min
Jun 20, 10:07 PM EDTSpecial Weather StatementDTXGenesee53 min
Jun 20, 10:14 PM EDTSpecial Weather StatementDTXOakland61 min
Jun 20, 10:25 PM EDTSevere Thunderstorm WarningDTXOakland41 min
Jun 20, 10:42 PM EDTSpecial Marine WarningDTX93 min
Jun 20, 10:44 PM EDTSevere Thunderstorm WarningDTXLenawee61 min
Jun 20, 10:54 PM EDTSpecial Weather StatementDTXWashtenaw51 min
Jun 20, 11:09 PM EDTSpecial Weather StatementDTXLapeer, Saint Clair, Sanilac51 min
Jun 20, 11:36 PM EDTSpecial Weather StatementDTXMonroe39 min
Jun 20, 11:39 PM EDTSpecial Marine WarningDTX66 min
Jun 21, 1:09 AM EDTSpecial Weather StatementDTXLenawee, Monroe51 min
Jun 21, 3:15 AM EDTSpecial Weather StatementDTXLenawee, Livingston, Washtenaw60 min
Jun 21, 3:35 AM EDTSevere Thunderstorm WarningDTXLenawee40 min
Jun 21, 3:54 AM EDTSevere Thunderstorm WarningDTXMonroe51 min
Jun 21, 3:56 AM EDTSpecial Marine WarningDTX35 min
Jun 21, 4:01 AM EDTSpecial Weather StatementDTXMacomb, Oakland, Washtenaw, Wayne59 min
Jun 21, 4:58 AM EDTSpecial Weather StatementDTXMacomb, Saint Clair62 min
Jun 21, 5:01 AM EDTSpecial Marine WarningDTX34 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.