Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Detroit, MI

July 24, 2021Huron County, Sanilac County, Tuscola County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 24, 2021, 4:37 PM EDT for Huron County, Sanilac County, Tuscola County, Michigan. It was in force for 53 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: Jul 24, 2021, 4:37 PM EDT (20:37 UTC)
Expired: Jul 24, 2021, 5:30 PM EDT
In force: 53 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Huron County, MI, Sanilac County, MI, Tuscola County, MI

The radar

The Detroit radar (KDTX), 103 km from the middle of the area, began a volume at 20:38 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 24, 5:40 PM EDT	TSTM WND DMG	2 Sse Cass City, MI	DISPATCH REPORTS TREE DOWN ON KELLY AND ENGLEHART RD
Jul 24, 5:40 PM EDT	TSTM WND DMG	2 Sse Cass City, MI	DISPATCH REPORTS TREE DOWN ON KELLY AND ENGLEHART 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.

Issued	Product	Office	Lasted
Jul 24, 3:16 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 8.6 hours before the alert went out and 100 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: 588 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 557 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

445 
WUUS53 KDTX 242037
SVRDTX
MIC063-151-157-242130-
/O.NEW.KDTX.SV.W.0049.210724T2037Z-210724T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
437 PM EDT Sat Jul 24 2021

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Tuscola County in southeastern Michigan...
  Northwestern Sanilac County in southeastern Michigan...
  Southwestern Huron County in southeastern Michigan...

* Until 530 PM EDT.

* At 437 PM EDT, a severe thunderstorm was located 8 miles north of
  Quanicassee, or 11 miles northeast of Bay City, moving east at 45
  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...
  Quanicassee around 440 PM EDT.
  Sebewaing, Akron and Unionville around 455 PM EDT.

Other locations in the path of this severe thunderstorm include
Owendale, Gagetown and Cass City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4378 8299 4349 8292 4339 8311 4338 8370
      4360 8370 4385 8339
TIME...MOT...LOC 2037Z 282DEG 39KT 4370 8371 

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

KDK

2 follow-up statements

844 
WWUS53 KDTX 242052
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
452 PM EDT Sat Jul 24 2021

MIC063-151-157-242130-
/O.CON.KDTX.SV.W.0049.000000T0000Z-210724T2130Z/
Tuscola MI-Sanilac MI-Huron MI-
452 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR TUSCOLA...NORTHWESTERN SANILAC AND SOUTHWESTERN HURON COUNTIES...

At 452 PM EDT, a severe thunderstorm was located over Unionville, or
near Sebewaing, moving east at 45 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...
  Owendale around 505 PM EDT.
  Gagetown around 510 PM EDT.
  Cass City around 515 PM EDT.

Other locations impacted by this severe thunderstorm include East
Dayton, Colling, Wilmot, Wisner, Ivanhoe, Ellington, Gilford, New
Greenleaf, Richville and Decker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4378 8299 4349 8292 4339 8311 4338 8370
      4360 8370 4385 8339
TIME...MOT...LOC 2052Z 282DEG 39KT 4367 8349 

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

RBP

968 
WWUS53 KDTX 242112 RRA
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
512 PM EDT Sat Jul 24 2021

MIC063-151-157-242130-
/O.CON.KDTX.SV.W.0049.000000T0000Z-210724T2130Z/
Tuscola MI-Sanilac MI-Huron MI-
512 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR TUSCOLA...NORTHWESTERN SANILAC AND SOUTHWESTERN HURON COUNTIES...

At 511 PM EDT, severe thunderstorms were located along a line
extending from Owendale to 6 miles southwest of Gagetown to near
Akron to near Reese, 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...
  Gagetown and Owendale around 515 PM EDT.
  Caro around 535 PM EDT.
  Cass City around 545 PM EDT.
  Kingston around 550 PM EDT.

Other locations impacted by these severe thunderstorms include East
Dayton, Colling, Wilmot, Wisner, Ivanhoe, Ellington, Gilford, New
Greenleaf, Richville and Decker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4376 8299 4349 8292 4339 8311 4338 8370
      4360 8370 4376 8349
TIME...MOT...LOC 2111Z 273DEG 35KT 4372 8325 4357 8331 4359 8359 4348
8367

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

RBP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 2:25 PM EDT	Special Marine Warning	DTX		95 min
Jul 24, 3:38 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland	67 min
Jul 24, 3:51 PM EDT	Special Marine Warning	DTX		114 min
Jul 24, 4:03 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland, Saginaw	57 min
Jul 24, 4:05 PM EDT	Special Marine Warning	DTX		55 min
Jul 24, 4:08 PM EDT	Severe Thunderstorm Warning	DTX	Huron	67 min
Jul 24, 4:26 PM EDT	Tornado Warning Tornado observed	DTX	Huron	37 min
Jul 24, 4:46 PM EDT	Tornado Warning	DTX	Saginaw	44 min
Jul 24, 4:57 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Genesee, Saginaw, Shiawassee	63 min
Jul 24, 5:11 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Lapeer, Tuscola	64 min
Jul 24, 5:23 PM EDT	Severe Thunderstorm Warning	DTX	Tuscola	36 min
Jul 24, 5:49 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac	37 min
Jul 24, 6:06 PM EDT	Severe Thunderstorm Warning	DTX	Shiawassee	54 min
Jul 24, 6:07 PM EDT	Special Marine Warning	DTX		68 min
Jul 24, 6:11 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Lapeer	64 min
Jul 24, 6:21 PM EDT	Tornado Warning	DTX	Genesee	22 min
Jul 24, 6:43 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer	62 min
Jul 24, 7:07 PM EDT	Special Weather Statement	DTX	Livingston, Macomb, Oakland, Shiawassee	53 min
Jul 24, 7:19 PM EDT	Areal Flood Advisory	DTX	Genesee, Lapeer, Oakland, Shiawassee	3 hr
Jul 24, 7:40 PM EDT	Severe Thunderstorm Warning	DTX	Livingston, Oakland	80 min
Jul 24, 7:52 PM EDT	Tornado Warning	DTX	Macomb	22 min
Jul 24, 7:56 PM EDT	Tornado Warning	DTX	Oakland	26 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.