Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Detroit, MI

July 24, 20214 counties in Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 24, 2021, 4:57 PM EDT for 4 counties in Michigan. It was in force for 63 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: Jul 24, 2021, 4:57 PM EDT (20:57 UTC)
Expired: Jul 24, 2021, 6:00 PM EDT
In force: 63 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Bay County, MI, Genesee County, MI, Saginaw County, MI, Shiawassee County, MI

The radar

The Detroit radar (KDTX), 92 km from the middle of the area, began a volume at 21:00 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, 5:09 PM EDT	FUNNEL CLOUD	1 S Saginaw, MI	TRAINED SPOTTER REPORTS FUNNEL CLOUD 1 MILE SOUTH OF SAGINAW.
Jul 24, 5:14 PM EDT	TSTM WND DMG	Saginaw, MI	DISPATCH REPORTS SEVERAL LARGE TREE LIMBS AND POWER LINES DOWN IN THE CITY OF SAGINAW.
Jul 24, 5:40 PM EDT	TSTM WND GST 50	1 Nw Frankenmuth, MI	MEASUED VIA FRANKENMUTH MESONET.

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, 9.0 hours before the alert went out and 92 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.

359 
WUUS53 KDTX 242057
SVRDTX
MIC017-049-145-155-242200-
/O.NEW.KDTX.SV.W.0050.210724T2057Z-210724T2200Z/

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

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Southeastern Bay County in southeastern Michigan...
  Saginaw County in southeastern Michigan...
  Northern Shiawassee County in southeastern Michigan...
  Northwestern Genesee County in southeastern Michigan...

* Until 600 PM EDT.

* At 457 PM EDT, severe thunderstorms were located along a line
  extending from near Quanicassee to 8 miles southeast of Ithaca,
  moving southeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Munger around 505 PM EDT.

Other locations in the path of these severe thunderstorms include
Oakley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4348 8424 4348 8417 4352 8417 4366 8386
      4360 8370 4320 8370 4306 8393 4312 8437
      4342 8437
TIME...MOT...LOC 2057Z 303DEG 36KT 4359 8373 4319 8451 

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

KDK

4 follow-up statements

794 
WWUS53 KDTX 242112
SVSDTX

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

MIC017-049-145-155-242200-
/O.CON.KDTX.SV.W.0050.000000T0000Z-210724T2200Z/
Bay MI-Saginaw MI-Shiawassee MI-Genesee MI-
512 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN BAY...SAGINAW...NORTHERN SHIAWASSEE AND NORTHWESTERN
GENESEE COUNTIES...

At 512 PM EDT, severe thunderstorms were located along a line
extending from near Quanicassee to near Bridgeport to Marion Springs,
moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Bridgeport and Munger around 515 PM EDT.

Other locations in the path of these severe thunderstorms include St.
Charles, Birch Run, Oakley, Frankenmuth, Chesaning, Clio, New Lothrop
and Montrose.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4333 8437 4344 8409 4360 8370 4320 8370
      4306 8393 4312 8437
TIME...MOT...LOC 2112Z 290DEG 29KT 4354 8366 4333 8397 4325 8435 

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

TF

188 
WWUS53 KDTX 242129
SVSDTX

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

MIC017-242138-
/O.CAN.KDTX.SV.W.0050.000000T0000Z-210724T2200Z/
Bay MI-
529 PM EDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BAY COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4331 8436 4334 8408 4348 8377 4348 8370
      4320 8370 4306 8393 4312 8437
TIME...MOT...LOC 2128Z 293DEG 30KT 4348 8344 4328 8382 4319 8425 

$$

MIC049-145-155-242200-
/O.CON.KDTX.SV.W.0050.000000T0000Z-210724T2200Z/
Saginaw MI-Shiawassee MI-Genesee MI-
529 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SAGINAW...NORTHERN SHIAWASSEE AND NORTHWESTERN GENESEE
COUNTIES...

At 528 PM EDT, severe thunderstorms were located along a line
extending from Caro to near Birch Run to near Marion Springs, moving
southeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Frankenmuth around 535 PM EDT.
  Clio around 540 PM EDT.
  New Lothrop around 555 PM EDT.
  Montrose around 600 PM EDT.

Other locations impacted by these severe thunderstorms include Brant,
Shiawassee National Wildlife Refuge, Fosters, Arthur, Fenmore, Burt,
Gera, Layton Corners and Buena Vista Township.

These storms have a history of producing funnel clouds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4331 8436 4334 8408 4348 8377 4348 8370
      4320 8370 4306 8393 4312 8437
TIME...MOT...LOC 2128Z 293DEG 30KT 4348 8344 4328 8382 4319 8425 

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

TF

963 
WWUS53 KDTX 242147
SVSDTX

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

MIC049-145-155-242200-
/O.CON.KDTX.SV.W.0050.000000T0000Z-210724T2200Z/
Saginaw MI-Shiawassee MI-Genesee MI-
547 PM EDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHERN SAGINAW...NORTHERN SHIAWASSEE AND NORTHWESTERN GENESEE
COUNTIES...

At 547 PM EDT, severe thunderstorms were located along a line
extending from near Vassar to New Lothrop to near Elsie, moving
southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Frankenmuth and New Lothrop around 550 PM EDT.
  Montrose around 555 PM EDT.
  Oakley around 610 PM EDT.

Other locations impacted by these severe thunderstorms include
Fenmore, Burt, Gera, Fosters and Layton Corners.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4322 8436 4326 8405 4344 8370 4320 8370
      4306 8393 4312 8437
TIME...MOT...LOC 2147Z 309DEG 12KT 4332 8364 4311 8400 4313 8435 

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

RBP

483 
WWUS53 KDTX 242159 RRA
SVSDTX

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

MIC049-145-155-242208-
/O.EXP.KDTX.SV.W.0050.000000T0000Z-210724T2200Z/
Saginaw MI-Shiawassee MI-Genesee MI-
559 PM EDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SAGINAW...NORTHERN
SHIAWASSEE AND NORTHWESTERN GENESEE COUNTIES WILL EXPIRE AT 600 PM
EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds to 45 mph are still possible with these thunderstorms.

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

LAT...LON 4322 8436 4326 8405 4344 8370 4320 8370
      4306 8393 4312 8437
TIME...MOT...LOC 2158Z 303DEG 36KT 4326 8352 4305 8388 4307 8423 

$$

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, 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.