Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 55, NWS Detroit, MI

July 24, 2021Genesee County, Lapeer County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 24, 2021, 6:11 PM EDT for Genesee County, Lapeer County, Michigan. It was in force for 64 min. 8 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, 6:11 PM EDT (22:11 UTC)
Expired: Jul 24, 2021, 7:15 PM EDT
In force: 64 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Genesee County, MI, Lapeer County, MI

The radar

The Detroit radar (KDTX), 41 km from the middle of the area, began a volume at 22:15 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, 6:20 PM EDT	FUNNEL CLOUD	3 S Flushing, MI	FUNNEL CLOUD REPORTED NEAR FLUSHING BY TRAINED SPOTTER.
Jul 24, 6:22 PM EDT	TSTM WND DMG	3 S Flushing, MI	REPORT OF A DESTROYED BARN VIA PHOTO ON CALKINS AND MORRISH RD
Jul 24, 6:22 PM EDT	TSTM WND DMG	3 S Flushing, MI	REPORT OF A DESTROYED BARN VIA PHOTO ON CALKINS AND MORRISH RD.
Jul 24, 6:23 PM EDT	TORNADO	5 S Flushing, MI	SIDING AND ROOF OF RESIDENTIAL HOME TORN OFF. PHOTOS SENT VIA TWITTER
Jul 24, 6:23 PM EDT	TORNADO	5 S Flushing, MI	SIDING AND ROOF OF RESIDENTIAL HOME TORN OFF. PHOTOS SENT VIA TWITTER.
Jul 24, 6:24 PM EDT	TSTM WND DMG	5 S Flushing, MI	REPORT OF MULTIPLE TREES DOWN AND BUILDING DAMAGE
Jul 24, 6:24 PM EDT	TSTM WND DMG	5 S Flushing, MI	REPORT OF MULTIPLE TREES DOWN AND BUILDING DAMAGE.
Jul 24, 6:27 PM EDT	TSTM WND DMG	5 S Flushing, MI	REPORTS OF SEVERAL LARGE LIMBS DOWN NEAR M-21 AND MORRISH ROAD.

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, 10.2 hours before the alert went out and 40 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.

556 
WUUS53 KDTX 242211
SVRDTX
MIC049-087-242315-
/O.NEW.KDTX.SV.W.0055.210724T2211Z-210724T2315Z/

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

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Western Lapeer County in southeastern Michigan...
  Genesee County in southeastern Michigan...

* Until 715 PM EDT.

* At 610 PM EDT, a line of severe thunderstorms were located New 
  Lothrop to Otter Lake moving southeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Burton around 620 PM EDT.
  Davison around 625 PM EDT.

Other locations in the path of this severe thunderstorm include Grand
Blanc, Goodrich and Hadley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4322 8393 4322 8346 4323 8346 4324 8335
      4288 8331 4287 8369 4278 8369 4278 8392
TIME...MOT...LOC 2210Z 316DEG 24KT 4311 8363 

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

KDK

4 follow-up statements

488 
WWUS53 KDTX 242217
SVSDTX

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

MIC049-087-242315-
/O.CON.KDTX.SV.W.0055.000000T0000Z-210724T2315Z/
Lapeer MI-Genesee MI-
617 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WESTERN LAPEER AND GENESEE COUNTIES...

At 617 PM EDT, severe thunderstorms were located along a line
extending from Columbiaville to near Flint to near Lennon, moving
southeast 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.

These severe storms will be near...
  Columbiaville and Otter Lake around 620 PM EDT.
  Burton around 625 PM EDT.
  Davison around 630 PM EDT.
  Lapeer, Grand Blanc and Gaines around 635 PM EDT.
  Goodrich around 640 PM EDT.
  Hadley and Linden around 645 PM EDT.
  Fenton and Lake Fenton around 650 PM EDT.

Other locations impacted by these severe thunderstorms include Atlas,
Thetford Township, Argentine, Rankin, Elba and Genesee.

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 4322 8346 4323 8346 4324 8335 4288 8331
      4287 8369 4278 8369 4278 8392 4312 8393
      4322 8373
TIME...MOT...LOC 2217Z 319DEG 26KT 4314 8341 4306 8367 4303 8393 

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

TF

275 
WWUS53 KDTX 242235
SVSDTX

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

MIC049-087-242315-
/O.CON.KDTX.SV.W.0055.000000T0000Z-210724T2315Z/
Lapeer MI-Genesee MI-
635 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WESTERN LAPEER AND GENESEE COUNTIES...

At 635 PM EDT, severe thunderstorms were located along a line
extending from near Lapeer to near Goodrich to near Swartz Creek,
moving southeast 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.

These severe storms will be near...
  Lapeer and Goodrich around 640 PM EDT.
  Hadley around 645 PM EDT.

Other locations impacted by these severe thunderstorms include Atlas,
Argentine, Rankin, Elba and Genesee.

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 4318 8346 4322 8343 4324 8335 4288 8331
      4287 8369 4278 8369 4278 8392 4309 8393
      4310 8368
TIME...MOT...LOC 2235Z 313DEG 28KT 4305 8328 4297 8354 4294 8380 

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

TF

587 
WWUS53 KDTX 242257
SVSDTX

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

MIC049-087-242315-
/O.CON.KDTX.SV.W.0055.000000T0000Z-210724T2315Z/
Lapeer MI-Genesee MI-
657 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHWESTERN LAPEER AND SOUTHERN GENESEE COUNTIES...

At 657 PM EDT, severe thunderstorms were located along a line
extending from near Metamora to near Lake Fenton to Gaines, moving
southeast at 25 mph.

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

SOURCE...Radar indicated.

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

These severe storms will be near...
  Hadley around 700 PM EDT.
  Goodrich around 705 PM EDT.

Other locations impacted by these severe thunderstorms include Atlas,
Argentine, Rankin and Elba.

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 4288 8331 4287 8369 4278 8369 4278 8392
      4298 8393 4303 8368 4308 8345 4311 8334
TIME...MOT...LOC 2257Z 294DEG 23KT 4288 8332 4286 8364 4288 8394 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

TF

726 
WWUS53 KDTX 242312
SVSDTX

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

MIC049-087-242321-
/O.EXP.KDTX.SV.W.0055.000000T0000Z-210724T2315Z/
Lapeer MI-Genesee MI-
712 PM EDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAPEER AND
SOUTHERN GENESEE COUNTIES WILL EXPIRE AT 715 PM EDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still 
possible with areas of thunderstorm across most of Genesee and 
Lapeer Counties.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southeastern Michigan.

LAT...LON 4288 8331 4287 8369 4278 8369 4278 8392
      4298 8393 4303 8368 4308 8345 4311 8334
TIME...MOT...LOC 2311Z 316DEG 24KT 4282 8324 4280 8356 4282 8386 

$$

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, 4:37 PM EDT	Severe Thunderstorm Warning	DTX	Huron, Sanilac, Tuscola	53 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, 6:21 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.