Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Detroit, MI

June 20, 2021Monroe County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jun 20, 2021, 9:02 PM EDT for Monroe County, Michigan. It was in force for 58 min. 3 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, 9:02 PM EDT (01:02 UTC)
Expired
Jun 20, 2021, 10:00 PM EDT
In force
58 min
Issued by
NWS Detroit, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Monroe County, MI

The radar

The Detroit radar (KDTX), 81 km from the middle of the area, began a volume at 01:06 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 DMG5 Nnw Temperance, MIDISPATCH REPORTS MULTIPLE TREES DOWN AROUND MOROCCO RD AND DOUGLAS RD
Jun 20, 9:26 PM EDTTSTM WND DMG5 Sse Dundee, MIDISPACTH REPORTS MULTIPLE TREES DOWN AROUND ALBAIN RD AND DOUGLAS RD
Jun 20, 9:40 PM EDTTSTM WND DMG4 Ne Dundee, MIDISPATCH REPORTS MULTIPLE TREES DOWN AROUND DAY RD AND PLANK RD

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, 1.0 hours before the alert went out and 83 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.

199 
WUUS53 KDTX 210102
SVRDTX
MIC115-210200-
/O.NEW.KDTX.SV.W.0008.210621T0102Z-210621T0200Z/

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

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Monroe County in southeastern Michigan...

* Until 1000 PM EDT.

* At 902 PM EDT, a severe thunderstorm was located over Lambertville,
  or near Temperance, 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 thunderstorm will be near...
  Temperance around 915 PM EDT.

Other locations in the path of this severe thunderstorm include Ida,
Luna Pier, Monroe, Maybee and Carleton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4176 8377 4208 8365 4209 8329 4207 8327
      4207 8326 4203 8320 4203 8318 4208 8319
      4209 8318 4209 8313 4205 8314 4173 8352
      4172 8376
TIME...MOT...LOC 0102Z 221DEG 24KT 4175 8366 

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

Mann
4 follow-up statements
921 
WWUS53 KDTX 210116
SVSDTX

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

MIC115-210200-
/O.CON.KDTX.SV.W.0008.000000T0000Z-210621T0200Z/
Monroe MI-
916 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR MONROE COUNTY...

At 916 PM EDT, a severe thunderstorm was located near Temperance,
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...
  Ida and Luna Pier around 925 PM EDT.
  Monroe and Maybee around 940 PM EDT.
  Carleton around 955 PM EDT.

Other locations impacted by this severe thunderstorm include Newport,
Estral Beach, Toledo Beach, Erie, South Rockwood, Woodland Beach,
Stony Point, Bolles Harbor, Samaria and Azalia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4176 8377 4208 8365 4209 8329 4207 8327
      4207 8326 4203 8320 4203 8318 4208 8319
      4209 8318 4209 8313 4205 8314 4173 8352
      4172 8376
TIME...MOT...LOC 0116Z 221DEG 24KT 4182 8357 

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

TF
674 
WWUS53 KDTX 210131
SVSDTX

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

MIC115-210200-
/O.CON.KDTX.SV.W.0008.000000T0000Z-210621T0200Z/
Monroe MI-
931 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR MONROE COUNTY...

At 930 PM EDT, a severe thunderstorm was located near Ida, or near
Monroe, moving northeast at 35 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...
  Monroe and Maybee around 935 PM EDT.
  Carleton around 950 PM EDT.

Other locations impacted by this severe thunderstorm include Newport,
Estral Beach, Toledo Beach, Erie, South Rockwood, Woodland Beach,
Stony Point, Bolles Harbor, Samaria and Azalia.

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 4176 8377 4208 8365 4209 8329 4207 8327
      4207 8326 4203 8320 4203 8318 4208 8319
      4209 8318 4209 8313 4205 8314 4173 8352
      4172 8376
TIME...MOT...LOC 0130Z 216DEG 29KT 4193 8351 

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

TF
876 
WWUS53 KDTX 210144
SVSDTX

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

MIC115-210200-
/O.CON.KDTX.SV.W.0008.000000T0000Z-210621T0200Z/
Monroe MI-
944 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM EDT
FOR MONROE COUNTY...

At 943 PM EDT, severe thunderstorms were located along a line
extending from near Milan to near Maybee to near Monroe, moving
northeast at 35 mph.

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

SOURCE...Radar indicated.

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

These severe storms will be near...
  Carleton around 950 PM EDT.

Other locations impacted by these severe thunderstorms include
Newport, Estral Beach, Toledo Beach, Erie, South Rockwood, Woodland
Beach, Stony Point, Bolles Harbor, Samaria and Azalia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4176 8377 4208 8365 4209 8329 4207 8327
      4207 8326 4203 8320 4203 8318 4208 8319
      4209 8318 4209 8313 4205 8314 4173 8352
      4172 8376
TIME...MOT...LOC 0143Z 229DEG 32KT 4205 8364 4201 8344 4193 8329 

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

TF
954 
WWUS53 KDTX 210202
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
1002 PM EDT Sun Jun 20 2021

MIC115-210212-
/O.EXP.KDTX.SV.W.0008.000000T0000Z-210621T0200Z/
Monroe MI-
1002 PM EDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR MONROE COUNTY HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.  However heavy
rain is still possible with these thunderstorms.

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

LAT...LON 4176 8377 4208 8365 4209 8329 4207 8327
      4207 8326 4203 8320 4203 8318 4208 8319
      4209 8318 4209 8313 4205 8314 4173 8352
      4172 8376
TIME...MOT...LOC 0202Z 221DEG 24KT 4214 8353 4210 8333 4202 8318 

$$

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, 9:12 PM EDTSevere Thunderstorm WarningDTXWayne63 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.