Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Detroit, MI

June 12, 2021Livingston County, Shiawassee County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jun 12, 2021, 6:45 PM EDT for Livingston County, Shiawassee County, Michigan. It was in force for 75 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 12, 2021, 6:45 PM EDT (22:45 UTC)
Expired: Jun 12, 2021, 8:00 PM EDT
In force: 75 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 2.5 in
Wind: 60.0 mph

Counties Livingston County, MI, Shiawassee County, MI

The radar

The Detroit radar (KDTX), 45 km from the middle of the area, began a volume at 22:48 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
Jun 12, 6:45 PM EDT	HAIL 1.25	Perry, MI	HALF DOLLAR SIZED HAIL - PHOTO SUBMITTED VIA FACEBOOK.
Jun 12, 7:52 PM EDT	TSTM WND DMG	4 Wnw Pinckney, MI	MULTIPLE TREES DOWN ACROSS M-36 BETWEEN PINCKNEY AND GREGORY. REPORT RELAYED VIA WFO GRAND RAPIDS.

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, 10.8 hours before the alert went out and 49 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: 5 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 714 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

275 
WUUS53 KDTX 122245
SVRDTX
MIC093-155-130000-
/O.NEW.KDTX.SV.W.0002.210612T2245Z-210613T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
645 PM EDT Sat Jun 12 2021

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Southwestern Shiawassee County in southeastern Michigan...
  Livingston County in southeastern Michigan...

* Until 800 PM EDT.

* At 644 PM EDT, a severe thunderstorm was located over Morrice, or
  over Perry, moving southeast at 25 mph.

  HAZARD...Tennis ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Fowlerville and Cohoctah around 715 PM EDT.
  Oak Grove around 720 PM EDT.
  Howell around 730 PM EDT.
  Brighton and Pinckney around 755 PM EDT.
  Hamburg and Whitmore Lake around 800 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,
Shaftsburg and Hell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4278 8393 4254 8367 4243 8367 4242 8414
      4277 8416 4278 8436 4295 8436
TIME...MOT...LOC 2244Z 323DEG 21KT 4283 8419 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...60MPH
 
$$

BT

3 follow-up statements

168 
WWUS53 KDTX 122258
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
658 PM EDT Sat Jun 12 2021

MIC093-155-130000-
/O.CON.KDTX.SV.W.0002.000000T0000Z-210613T0000Z/
Shiawassee MI-Livingston MI-
658 PM EDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTHWESTERN SHIAWASSEE AND LIVINGSTON COUNTIES...

At 658 PM EDT, a severe thunderstorm was located near Morrice, or
near Perry, moving southeast at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Fowlerville and Cohoctah around 715 PM EDT.
  Oak Grove around 725 PM EDT.
  Howell around 735 PM EDT.
  Brighton and Pinckney around 755 PM EDT.
  Hamburg around 810 PM EDT.
  Whitmore Lake around 815 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,
Shaftsburg and Hell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4278 8393 4254 8367 4243 8367 4242 8414
      4277 8416 4278 8436 4295 8436
TIME...MOT...LOC 2258Z 323DEG 20KT 4277 8414 

HAIL...1.75IN
WIND...60MPH
 
$$

BT

014 
WWUS53 KDTX 122316
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
716 PM EDT Sat Jun 12 2021

MIC155-122324-
/O.CAN.KDTX.SV.W.0002.000000T0000Z-210613T0000Z/
Shiawassee MI-
716 PM EDT Sat Jun 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SHIAWASSEE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4278 8401 4250 8367 4243 8367 4242 8414
      4277 8416
TIME...MOT...LOC 2314Z 331DEG 21KT 4266 8411 

$$

MIC093-130000-
/O.CON.KDTX.SV.W.0002.000000T0000Z-210613T0000Z/
Livingston MI-
716 PM EDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR LIVINGSTON COUNTY...

At 715 PM EDT, a severe thunderstorm was located just west of 
Fowlerville, moving southeast at 25 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...
  Gregory around 745 PM EDT.
  Pinckney around 755 PM EDT.
  Hamburg around 805 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
and Hell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4278 8401 4250 8367 4243 8367 4242 8414
      4277 8416
TIME...MOT...LOC 2314Z 331DEG 21KT 4266 8411 

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

BT

897 
WWUS53 KDTX 122337
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
737 PM EDT Sat Jun 12 2021

MIC093-130000-
/O.CON.KDTX.SV.W.0002.000000T0000Z-210613T0000Z/
Livingston MI-
737 PM EDT Sat Jun 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTHERN LIVINGSTON COUNTY...

At 736 PM EDT, a severe thunderstorm was located near Gregory, or 7 
miles northwest of Pinckney, moving southeast at 25 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Pinckney around 750 PM EDT.

Other locations impacted by this severe thunderstorm include Parkers
Corners, Lakeland, Plainfield, Chilson, Unadilla, Pinckney State
Recreation Area and Hell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. Seek shelter inside a sturdy 
structure and stay away from windows.

&&

LAT...LON 4266 8396 4243 8367 4242 8414 4266 8415
TIME...MOT...LOC 2334Z 330DEG 22KT 4252 8405 

HAIL...1.50IN
WIND...60MPH
 
$$

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 8:43 PM EDT	Special Weather Statement	DTX	Lenawee, Monroe	62 min
Jun 12, 4:22 PM EDT	Special Weather Statement	DTX	Bay, Midland	53 min
Jun 12, 5:18 PM EDT	Special Weather Statement	DTX	Saginaw, Shiawassee	57 min
Jun 12, 5:38 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw, Shiawassee	67 min
Jun 12, 7:42 PM EDT	Special Weather Statement	DTX	Bay, Midland	93 min
Jun 12, 7:59 PM EDT	Severe Thunderstorm Warning	DTX	Livingston, Washtenaw	76 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.