Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 110, NWS Detroit, MI

September 7, 2021Saginaw County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Sep 7, 2021, 4:45 PM EDT for Saginaw County, Michigan. It was in force for 31 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: Sep 7, 2021, 4:45 PM EDT (20:45 UTC)
Expired: Sep 7, 2021, 5:16 PM EDT
In force: 31 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Saginaw County, MI

The radar

The Detroit radar (KDTX), 84 km from the middle of the area, began a volume at 20:45 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
Sep 7, 4:45 PM EDT	TSTM WND DMG	Carrollton, MI	MEDIA RELAYED DAMAGE PHOTOS VIA SOCIAL MEDIA OF DAMAGE IN CARROLLTON.
Sep 7, 5:00 PM EDT	TSTM WND GST 60	2 Ssw Saginaw, MI	TRAINED SPOTTER ESTIMATED 60 MPH WINDS. TIME ESTIMATED VIA RADAR.

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
Sep 7, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 8.8 hours before the alert went out and 84 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1621 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

618 
WUUS53 KDTX 072045
SVRDTX
MIC145-072130-
/O.NEW.KDTX.SV.W.0110.210907T2045Z-210907T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
445 PM EDT Tue Sep 7 2021

The National Weather Service in Detroit/Pontiac has issued a

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

* Until 530 PM EDT.

* At 444 PM EDT, a severe thunderstorm was located over St. Charles,
  moving east at 60 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 thunderstorm will be near...
  Bridgeport around 455 PM EDT.
  Birch Run around 500 PM EDT.
  Frankenmuth around 505 PM EDT.

Other locations impacted by this severe thunderstorm include Brant,
Nelson, Carrollton, Garfield, Arthur, Burt, Gera, Buena Vista
Township, Swan Creek and Shiawassee National Wildlife Refuge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4348 8371 4322 8370 4320 8436 4344 8437
TIME...MOT...LOC 2044Z 260DEG 54KT 4332 8410 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SF

2 follow-up statements

725 
WWUS53 KDTX 072102
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
502 PM EDT Tue Sep 7 2021

MIC145-072130-
/O.CON.KDTX.SV.W.0110.000000T0000Z-210907T2130Z/
Saginaw MI-
502 PM EDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL SAGINAW COUNTY...

At 500 PM EDT, a severe thunderstorm was located over Frankenmuth, 
moving east at 60 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 thunderstorm will remain over mainly rural areas of
central Saginaw County, including the following locations... Brant,
Nelson, Garfield, Arthur, Burt, Gera, Buena Vista Township, Swan
Creek, Shiawassee National Wildlife Refuge and Fosters.

A secondary strong thunderstorm is also located near Hemlock moving 
east at 60 mph. This storm may be capable of intensifying and 
producing wind gusts around 60 mph. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4348 8371 4322 8370 4320 8428 4342 8428
TIME...MOT...LOC 2100Z 260DEG 54KT 4336 8376 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

AM

396 
WWUS53 KDTX 072116
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
516 PM EDT Tue Sep 7 2021

MIC145-072125-
/O.CAN.KDTX.SV.W.0110.000000T0000Z-210907T2130Z/
Saginaw MI-
516 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAGINAW COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has 
been cancelled.  However gusty winds to 50 mph and heavy rain are 
still possible with this thunderstorm.

LAT...LON 4348 8371 4322 8370 4320 8428 4342 8428
TIME...MOT...LOC 2113Z 260DEG 54KT 4340 8344 

$$

AM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 2:51 PM EDT	Special Marine Warning	DTX		114 min
Sep 7, 2:54 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland	66 min
Sep 7, 3:07 PM EDT	Tornado Warning	DTX	Bay, Midland	31 min
Sep 7, 3:24 PM EDT	Severe Thunderstorm Warning	DTX	Huron	66 min
Sep 7, 3:30 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland, Saginaw	75 min
Sep 7, 3:31 PM EDT	Special Marine Warning	DTX		77 min
Sep 7, 3:53 PM EDT	Severe Thunderstorm Warning	DTX	Tuscola	82 min
Sep 7, 4:03 PM EDT	Special Marine Warning	DTX		92 min
Sep 7, 4:19 PM EDT	Special Weather Statement	DTX	Sanilac	56 min
Sep 7, 4:38 PM EDT	Special Weather Statement	DTX	Genesee, Lapeer, Shiawassee	82 min
Sep 7, 5:14 PM EDT	Special Weather Statement	DTX	Tuscola	61 min
Sep 7, 5:24 PM EDT	Special Weather Statement	DTX	Saginaw	66 min
Sep 7, 5:49 PM EDT	Areal Flood Advisory	DTX	Saginaw	3 hr
Sep 7, 5:55 PM EDT	Severe Thunderstorm Warning	DTX	Livingston, Shiawassee	80 min
Sep 7, 6:12 PM EDT	Special Weather Statement	DTX	Sanilac	78 min
Sep 7, 6:18 PM EDT	Special Marine Warning	DTX		97 min
Sep 7, 6:22 PM EDT	Special Weather Statement	DTX	Tuscola	53 min
Sep 7, 6:23 PM EDT	Special Weather Statement	DTX	Washtenaw	52 min
Sep 7, 6:29 PM EDT	Special Weather Statement	DTX	Arenac	46 min
Sep 7, 6:45 PM EDT	Special Weather Statement	DTX	Oakland	30 min
Sep 7, 6:46 PM EDT	Areal Flood Advisory	DTX	Tuscola	3 hr
Sep 7, 6:54 PM EDT	Special Marine Warning	DTX		88 min
Sep 7, 7:00 PM EDT	Special Weather Statement	DTX	Bay	30 min
Sep 7, 7:14 PM EDT	Special Marine Warning	DTX		61 min
Sep 7, 7:21 PM EDT	Special Weather Statement	DTX	Lapeer, Macomb, Saint Clair	24 min
Sep 7, 7:25 PM EDT	Special Weather Statement	DTX	Huron	35 min
Sep 7, 7:33 PM EDT	Special Weather Statement	DTX	Genesee, Shiawassee	57 min
Sep 7, 7:36 PM EDT	Severe Thunderstorm Warning	DTX	Shiawassee	17 min
Sep 7, 7:55 PM EDT	Severe Thunderstorm Warning	DTX	Lenawee	33 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.