Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Detroit, MI

August 11, 2021Saginaw County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Aug 11, 2021, 2:31 PM EDT for Saginaw County, Michigan. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2021, 2:31 PM EDT (18:31 UTC)
Expired: Aug 11, 2021, 3:13 PM EDT
In force: 42 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Saginaw County, MI

The radar

The Detroit radar (KDTX), 86 km from the middle of the area, began a volume at 18:33 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.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 6.5 hours before the alert went out and 87 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: 106 J/kg
Mixed-layer CIN: -290 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

661 
WUUS53 KDTX 111831
SVRDTX
MIC145-111930-
/O.NEW.KDTX.SV.W.0071.210811T1831Z-210811T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
231 PM EDT Wed Aug 11 2021

The National Weather Service in Detroit/Pontiac has issued a

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

* Until 330 PM EDT.

* At 230 PM EDT, a severe thunderstorm was located near Ithaca,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Marion Springs around 245 PM EDT.
  St. Charles around 300 PM EDT.
  Bridgeport around 315 PM EDT.
  Saginaw and Zilwaukee around 320 PM EDT.

Other locations impacted by this severe thunderstorm include Brant,
Nelson, Carrollton, Garfield, Fenmore, Burt, Buena Vista Township,
Layton Corners, 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 4343 8437 4348 8417 4350 8389 4322 8388
      4322 8393 4313 8393 4313 8436
TIME...MOT...LOC 1830Z 250DEG 40KT 4322 8456 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KDK

2 follow-up statements

036 
WWUS53 KDTX 111845
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
245 PM EDT Wed Aug 11 2021

MIC145-111930-
/O.CON.KDTX.SV.W.0071.000000T0000Z-210811T1930Z/
Saginaw MI-
245 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SAGINAW COUNTY...

At 245 PM EDT, a severe thunderstorm was located over Marion Springs,
or 10 miles west of St. Charles, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe storm will be near...
  St. Charles around 300 PM EDT.
  Bridgeport around 315 PM EDT.
  Saginaw and Zilwaukee around 320 PM EDT.

Other locations impacted by this severe thunderstorm include Brant,
Nelson, Carrollton, Garfield, Fenmore, Burt, Buena Vista Township,
Layton Corners, 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 4343 8437 4348 8417 4350 8389 4322 8388
      4322 8393 4313 8393 4313 8436
TIME...MOT...LOC 1845Z 248DEG 37KT 4328 8435 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BT

033 
WWUS53 KDTX 111913
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
313 PM EDT Wed Aug 11 2021

MIC145-111914-
/O.CAN.KDTX.SV.W.0071.000000T0000Z-210811T1930Z/
Saginaw MI-
313 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SAGINAW COUNTY IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Michigan.

LAT...LON 4343 8437 4348 8417 4350 8389 4322 8388
      4322 8393 4313 8393 4313 8436
TIME...MOT...LOC 1859Z 250DEG 40KT 4335 8407 

$$

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 11:43 PM EDT	Severe Thunderstorm Warning	DTX	Bay, Midland, Saginaw	62 min
Aug 10, 11:53 PM EDT	Special Weather Statement	DTX	Genesee, Livingston, Shiawassee, Washtenaw	52 min
Aug 10, 11:58 PM EDT	Special Marine Warning	DTX		92 min
Aug 11, 12:02 AM EDT	Severe Thunderstorm Warning	DTX	Genesee, Livingston, Oakland, Shiawassee, Washtenaw	58 min
Aug 11, 12:43 AM EDT	Severe Thunderstorm Warning	DTX	Bay, Huron, Saginaw, Tuscola	47 min
Aug 11, 1:09 AM EDT	Special Marine Warning	DTX		81 min
Aug 11, 1:11 AM EDT	Special Weather Statement	DTX	Huron	49 min
Aug 11, 1:29 AM EDT	Special Marine Warning	DTX		46 min
Aug 11, 4:04 AM EDT	Heat Advisory	DTX	Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw and 1 more	13 hr
Aug 11, 2:22 PM EDT	Severe Thunderstorm Warning	DTX	Lenawee, Washtenaw	68 min
Aug 11, 2:42 PM EDT	Severe Thunderstorm Warning	DTX	Livingston	63 min
Aug 11, 2:59 PM EDT	Severe Thunderstorm Warning	DTX	Monroe, Wayne	76 min
Aug 11, 3:02 PM EDT	Special Weather Statement	DTX	Genesee	58 min
Aug 11, 3:09 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	66 min
Aug 11, 3:16 PM EDT	Severe Thunderstorm Warning	DTX	Genesee, Shiawassee	59 min
Aug 11, 3:17 PM EDT	Special Marine Warning	DTX		88 min
Aug 11, 3:36 PM EDT	Special Marine Warning	DTX		84 min
Aug 11, 3:36 PM EDT	Severe Thunderstorm Warning	DTX	Lapeer, Macomb, Saint Clair, Sanilac	69 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.