Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 89, NWS Detroit, MI

August 28, 2021Bay County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Aug 28, 2021, 6:22 PM EDT for Bay County, Michigan. It was in force for 38 min. 1 report 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: Aug 28, 2021, 6:22 PM EDT (22:22 UTC)
Expired: Aug 28, 2021, 7:00 PM EDT
In force: 38 min
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Bay County, MI

The radar

The Detroit radar (KDTX), 103 km from the middle of the area, began a volume at 22:23 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
Aug 28, 6:44 PM EDT	TSTM WND DMG	Bay City, MI	TREES DOWN. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 10.4 hours before the alert went out and 102 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: 1891 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

223 
WUUS53 KDTX 282222
SVRDTX
MIC017-282300-
/O.NEW.KDTX.SV.W.0089.210828T2222Z-210828T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Detroit/Pontiac MI
622 PM EDT Sat Aug 28 2021

The National Weather Service in Detroit/Pontiac has issued a

* Severe Thunderstorm Warning for...
  Southern Bay County in southeastern Michigan...

* Until 700 PM EDT.

* At 622 PM EDT, a severe thunderstorm was located near Auburn,
  moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Kawkawlin around 630 PM EDT.
  Bay City around 635 PM EDT.
  Essexville around 640 PM EDT.
  Munger around 645 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4367 8405 4366 8379 4364 8372 4360 8368
      4359 8368 4358 8370 4348 8370 4348 8382
      4352 8382 4352 8405 4357 8405 4357 8408
TIME...MOT...LOC 2222Z 264DEG 26KT 4354 8401 

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

$$

DG

1 follow-up statement

943 
WWUS53 KDTX 282247
SVSDTX

Severe Weather Statement
National Weather Service Detroit/Pontiac MI
647 PM EDT Sat Aug 28 2021

MIC017-282300-
/O.CON.KDTX.SV.W.0089.000000T0000Z-210828T2300Z/
Bay MI-
647 PM EDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHEASTERN BAY COUNTY...

At 647 PM EDT, a severe thunderstorm was located over Munger, or near
Bay City, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe thunderstorm will remain over mainly rural areas of
southeastern Bay County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4360 8368 4359 8368 4358 8370 4348 8370
      4348 8382 4352 8382 4352 8395 4353 8395
      4361 8392
TIME...MOT...LOC 2247Z 264DEG 23KT 4356 8379 

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

$$

DG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 3:42 AM EDT	Heat Advisory	DTX	Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 5 more	16 hr
Aug 28, 4:25 AM EDT	Special Weather Statement	DTX	Bay, Midland	65 min
Aug 28, 3:45 PM EDT	Special Weather Statement	DTX	Saint Clair	60 min
Aug 28, 5:06 PM EDT	Special Weather Statement	DTX	Bay, Midland	84 min
Aug 28, 5:26 PM EDT	Special Marine Warning	DTX		94 min
Aug 28, 5:46 PM EDT	Special Weather Statement	DTX	Saginaw	74 min
Aug 28, 5:52 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw	68 min
Aug 28, 6:16 PM EDT	Severe Thunderstorm Warning	DTX	Huron	59 min
Aug 28, 6:19 PM EDT	Special Marine Warning	DTX		86 min
Aug 28, 6:43 PM EDT	Special Weather Statement	DTX	Tuscola	62 min
Aug 28, 6:51 PM EDT	Severe Thunderstorm Warning	DTX	Huron, Tuscola	54 min
Aug 28, 6:59 PM EDT	Special Marine Warning	DTX		31 min
Aug 28, 7:02 PM EDT	Severe Thunderstorm Warning	DTX	Saginaw	58 min
Aug 28, 7:07 PM EDT	Areal Flood Advisory	DTX	Saginaw	3 hr
Aug 28, 7:11 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac	64 min
Aug 28, 7:41 PM EDT	Special Weather Statement	DTX	Genesee, Lapeer, Shiawassee	79 min
Aug 28, 7:59 PM EDT	Special Marine Warning	DTX		91 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.