Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Gaylord, MI

August 10, 20214 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 10, 2021, 11:24 PM EDT for 4 counties in Michigan. It was in force for 51 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: Aug 10, 2021, 11:24 PM EDT (03:24 UTC)
Expired: Aug 11, 2021, 12:15 AM EDT
In force: 51 min
Issued by: NWS Gaylord, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Antrim County, MI, Crawford County, MI, Kalkaska County, MI, Otsego County, MI

The radar

The NCL Michigan radar (KAPX), 7 km from the middle of the area, began a volume at 03:26 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 10, 11:30 PM EDT	TSTM WND DMG	Frederic, MI	TREES AND POWERLINES DOWN.
Aug 10, 11:58 PM EDT	TSTM WND GST 54	1 Ssw Gaylord, MI	ASOS STATION KGLR GAYLORD - OTSEGO COUNTY AIRPORT.

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
Aug 10, 8:38 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 3.4 hours before the alert went out and 184 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: 579 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

922 
WUUS53 KAPX 110324
SVRAPX
MIC009-039-079-137-110415-
/O.NEW.KAPX.SV.W.0026.210811T0324Z-210811T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
1124 PM EDT Tue Aug 10 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Otsego County in northern Michigan...
  Southeastern Antrim County in northern Michigan...
  Northern Crawford County in northern Michigan...
  Northeastern Kalkaska County in northern Michigan...

* Until 1215 AM EDT.

* At 1124 PM EDT, severe thunderstorms were located along a line
  extending from near Mancelona to near Bear Lake, moving northeast
  at 40 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Frederic and Hartwick Pines State Park around 1140 PM EDT.

Other locations in the path of these severe thunderstorms include
Otsego Lake State Park, Waters, Gaylord, Lovells, Sparr, Chester
Township, Johannesburg and Lewiston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4470 8497 4488 8508 4516 8454 4492 8437
      4472 8437
TIME...MOT...LOC 0324Z 246DEG 35KT 4489 8501 4469 8490 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cornish

3 follow-up statements

850 
WWUS53 KAPX 110337
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
1137 PM EDT Tue Aug 10 2021

MIC079-110347-
/O.CAN.KAPX.SV.W.0026.000000T0000Z-210811T0415Z/
Kalkaska MI-
1137 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KALKASKA 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 300 AM EDT for
northern Michigan.

LAT...LON 4471 8478 4483 8485 4486 8485 4486 8491
      4495 8494 4516 8454 4492 8437 4472 8437
TIME...MOT...LOC 0337Z 246DEG 35KT 4494 8486 4474 8475 

$$

MIC009-039-137-110415-
/O.CON.KAPX.SV.W.0026.000000T0000Z-210811T0415Z/
Otsego MI-Antrim MI-Crawford MI-
1137 PM EDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR OTSEGO...EAST CENTRAL ANTRIM AND NORTHERN CRAWFORD COUNTIES...

At 1137 PM EDT, severe thunderstorms were located along a line
extending from near Alba to near Hartwick Pines State Park, moving
northeast at 40 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Frederic and Hartwick Pines State Park around 1140 PM EDT.

Other locations in the path of these severe thunderstorms include
Waters, Gaylord, Otsego Lake State Park, Lovells, Sparr, Chester
Township, Johannesburg and Lewiston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4471 8478 4483 8485 4486 8485 4486 8491
      4495 8494 4516 8454 4492 8437 4472 8437
TIME...MOT...LOC 0337Z 246DEG 35KT 4494 8486 4474 8475 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Cornish

018 
WWUS53 KAPX 110357
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
1157 PM EDT Tue Aug 10 2021

MIC009-110406-
/O.CAN.KAPX.SV.W.0026.000000T0000Z-210811T0415Z/
Antrim MI-
1157 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ANTRIM 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 300 AM EDT for
northern Michigan.

LAT...LON 4472 8456 4487 8466 4491 8480 4498 8485
      4500 8485 4516 8454 4492 8437 4472 8437
TIME...MOT...LOC 0356Z 257DEG 36KT 4501 8461 4481 8450 

$$

MIC039-137-110415-
/O.CON.KAPX.SV.W.0026.000000T0000Z-210811T0415Z/
Otsego MI-Crawford MI-
1157 PM EDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR OTSEGO AND NORTHEASTERN CRAWFORD COUNTIES...

At 1156 PM EDT, severe thunderstorms were located along a line
extending from near Sparr to Lovells, moving east at 40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Lovells, Johannesburg and Lewiston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4472 8456 4487 8466 4491 8480 4498 8485
      4500 8485 4516 8454 4492 8437 4472 8437
TIME...MOT...LOC 0356Z 257DEG 36KT 4501 8461 4481 8450 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cornish

134 
WWUS53 KAPX 110406
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
1206 AM EDT Wed Aug 11 2021

MIC039-137-110415-
/O.CON.KAPX.SV.W.0026.000000T0000Z-210811T0415Z/
Otsego MI-Crawford MI-
1206 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT
FOR CENTRAL OTSEGO AND NORTHEASTERN CRAWFORD COUNTIES...

At 1206 AM EDT, severe thunderstorms were located along a line
extending from near Sparr to near Hetherton, moving northeast at 40
mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Gaylord, Lewiston, Lovells, Sparr, Chester Township and Johannesburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4472 8445 4490 8455 4498 8468 4495 8483
      4496 8483 4500 8485 4516 8454 4492 8437
      4472 8437
TIME...MOT...LOC 0406Z 237DEG 34KT 4509 8460 4494 8439 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cornish

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:00 PM EDT	Special Marine Warning	APX		2 hr
Aug 10, 9:44 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Charlevoix	46 min
Aug 10, 10:04 PM EDT	Severe Thunderstorm Warning	APX	Benzie, Grand Traverse, Leelanau, Manistee, Wexford	41 min
Aug 10, 10:30 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Kalkaska	30 min
Aug 10, 10:45 PM EDT	Severe Thunderstorm Warning Considerable damage threat	APX	Benzie, Grand Traverse, Kalkaska, Leelanau, Missaukee, Wexford	45 min
Aug 10, 10:52 PM EDT	Flash Flood Warning	APX	Antrim, Grand Traverse	3 hr
Aug 10, 10:58 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Crawford, Kalkaska, Otsego	32 min
Aug 10, 11:28 PM EDT	Severe Thunderstorm Warning	APX	Crawford, Kalkaska, Missaukee, Roscommon	32 min
Aug 11, 12:13 AM EDT	Flash Flood Warning	APX	Leelanau	3 hr
Aug 11, 12:28 AM EDT	Severe Thunderstorm Warning	APX	Alcona, Arenac, Iosco, Ogemaw, Oscoda	47 min
Aug 11, 12:31 AM EDT	Severe Thunderstorm Warning	APX	Alcona, Alpena, Montmorency, Oscoda, Presque Isle	44 min
Aug 11, 12:37 AM EDT	Special Marine Warning	APX		83 min
Aug 11, 1:46 AM EDT	Areal Flood Warning	APX	Antrim, Grand Traverse	3 hr
Aug 11, 4:12 AM EDT	Small Craft Advisory	APX		16 hr
Aug 11, 2:52 PM EDT	Special Marine Warning	APX		53 min
Aug 11, 2:59 PM EDT	Special Weather Statement	APX	Mackinac	31 min
Aug 11, 3:11 PM EDT	Special Marine Warning	APX		64 min
Aug 11, 3:18 PM EDT	Special Weather Statement	APX	Chippewa	42 min
Aug 11, 3:38 PM EDT	Special Marine Warning	APX		52 min
Aug 11, 3:47 PM EDT	Severe Thunderstorm Warning	APX	Chippewa, Mackinac	43 min
Aug 11, 3:58 PM EDT	Special Marine Warning	APX		92 min
Aug 11, 4:11 PM EDT	Severe Thunderstorm Warning	APX	Chippewa, Mackinac	49 min
Aug 11, 4:24 PM EDT	Special Marine Warning	APX		2 hr
Aug 11, 4:54 PM EDT	Severe Thunderstorm Warning	APX	Cheboygan	51 min
Aug 11, 5:00 PM EDT	Severe Thunderstorm Warning	APX	Emmet	18 min
Aug 11, 5:24 PM EDT	Severe Thunderstorm Warning	APX	Charlevoix, Cheboygan, Emmet	36 min
Aug 11, 5:28 PM EDT	Special Marine Warning	APX		2 hr
Aug 11, 5:30 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Benzie, Grand Traverse, Kalkaska, Leelanau	45 min
Aug 11, 5:43 PM EDT	Severe Thunderstorm Warning	APX	Cheboygan, Emmet, Presque Isle	47 min
Aug 11, 5:52 PM EDT	Severe Thunderstorm Warning	APX	Cheboygan, Presque Isle	38 min
Aug 11, 6:00 PM EDT	Severe Thunderstorm Warning Destructive damage threat	APX	Benzie, Leelanau	30 min
Aug 11, 6:09 PM EDT	Severe Thunderstorm Warning	APX	Antrim, Crawford, Kalkaska, Otsego	35 min
Aug 11, 6:24 PM EDT	Severe Thunderstorm Warning Considerable damage threat	APX	Antrim, Benzie, Grand Traverse, Kalkaska, Leelanau	51 min
Aug 11, 6:26 PM EDT	Special Marine Warning	APX		34 min
Aug 11, 6:31 PM EDT	Severe Thunderstorm Warning	APX	Crawford, Montmorency, Oscoda, Otsego	44 min
Aug 11, 6:58 PM EDT	Severe Thunderstorm Warning	APX	Alcona, Alpena, Presque Isle	47 min
Aug 11, 7:26 PM EDT	Special Marine Warning	APX		46 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.