Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Gaylord, MI

August 11, 20215 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 11, 2021, 6:24 PM EDT for 5 counties in Michigan. It was in force for 51 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, 6:24 PM EDT (22:24 UTC)
Expired
Aug 11, 2021, 7:15 PM EDT
In force
51 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Damage threat
Considerable
Hail
0.75 in
Wind
70.0 mph

Counties Antrim County, MI, Benzie County, MI, Grand Traverse County, MI, Kalkaska County, MI, Leelanau County, MI

The radar

The NCL Michigan radar (KAPX), 81 km from the middle of the area, began a volume at 22:28 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 11, 4:48 PM EDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.4 hours before the alert went out and 190 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1499 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1499 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

567 
WUUS53 KAPX 112224
SVRAPX
MIC009-019-055-079-089-112315-
/O.NEW.KAPX.SV.W.0040.210811T2224Z-210811T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
624 PM EDT Wed Aug 11 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Southeastern Leelanau County in northern Michigan...
  Northeastern Benzie County in northern Michigan...
  Central Grand Traverse County in northern Michigan...
  Southern Antrim County in northern Michigan...
  Northern Kalkaska County in northern Michigan...

* Until 715 PM EDT.

* At 623 PM EDT, a severe thunderstorm was located over Lake Ann, or
  10 miles east of Empire, moving east at 65 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Traverse City and Greilickville around 635 PM EDT.
  Elk Rapids and Williamsburg around 645 PM EDT.
  Rapid City, Barker Creek and Alden around 650 PM EDT.
  Kalkaska around 655 PM EDT.
  Mancelona around 700 PM EDT.

Other locations impacted by this severe thunderstorm include Blue
Lake Township, Bates and Lake Bellaire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4488 8603 4501 8490 4467 8489 4466 8600
      4477 8602 4477 8603 4478 8602
TIME...MOT...LOC 2223Z 262DEG 56KT 4477 8586 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

JZ
4 follow-up statements
995 
WWUS53 KAPX 112240
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
640 PM EDT Wed Aug 11 2021

MIC019-112249-
/O.CAN.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Benzie MI-
640 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BENZIE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Michigan.

LAT...LON 4491 8578 4501 8490 4467 8489 4467 8582
TIME...MOT...LOC 2239Z 263DEG 49KT 4479 8556 

$$

MIC009-055-079-089-112315-
/O.CON.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Leelanau MI-Grand Traverse MI-Antrim MI-Kalkaska MI-
640 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHEASTERN LEELANAU...CENTRAL GRAND TRAVERSE...SOUTHERN ANTRIM
AND NORTHERN KALKASKA COUNTIES...

At 639 PM EDT, a severe thunderstorm was located over Traverse City
State Park, moving east at 55 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Elk Rapids and Williamsburg around 650 PM EDT.
  Rapid City, Barker Creek and Alden around 655 PM EDT.
  Kalkaska around 700 PM EDT.
  Mancelona, Antrim and Darragh around 705 PM EDT.

Other locations impacted by this severe thunderstorm include Blue
Lake Township, Bates and Lake Bellaire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4491 8578 4501 8490 4467 8489 4467 8582
TIME...MOT...LOC 2239Z 263DEG 49KT 4479 8556 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

JZ
748 
WWUS53 KAPX 112254
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
654 PM EDT Wed Aug 11 2021

MIC089-112303-
/O.CAN.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Leelanau MI-
654 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEELANAU COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Michigan.

LAT...LON 4490 8555 4497 8490 4467 8489 4467 8555
TIME...MOT...LOC 2253Z 262DEG 49KT 4481 8530 

$$

MIC009-055-079-112315-
/O.CON.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Grand Traverse MI-Antrim MI-Kalkaska MI-
654 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHEASTERN GRAND TRAVERSE...SOUTHERN ANTRIM AND NORTHERN
KALKASKA COUNTIES...

At 653 PM EDT, a severe thunderstorm was located over Rapid City, or
7 miles southeast of Elk Rapids, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Antrim and Darragh around 705 PM EDT.
  Mancelona around 710 PM EDT.

Other locations impacted by this severe thunderstorm include Blue
Lake Township and Bates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4490 8555 4497 8490 4467 8489 4467 8555
TIME...MOT...LOC 2253Z 262DEG 49KT 4481 8530 

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

$$

JZ
034 
WWUS53 KAPX 112306
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
706 PM EDT Wed Aug 11 2021

MIC055-112316-
/O.CAN.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Grand Traverse MI-
706 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRAND TRAVERSE
COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Michigan.

LAT...LON 4492 8533 4497 8490 4467 8489 4467 8532
TIME...MOT...LOC 2306Z 270DEG 47KT 4477 8511 

$$

MIC009-079-112315-
/O.CON.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Antrim MI-Kalkaska MI-
706 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHERN ANTRIM AND NORTHERN KALKASKA COUNTIES...

At 706 PM EDT, a severe thunderstorm was located near Darragh, or
near Kalkaska, moving east at 55 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
southern Antrim and northern Kalkaska Counties, including the
following locations... Blue Lake Township.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4492 8533 4497 8490 4467 8489 4467 8532
TIME...MOT...LOC 2306Z 270DEG 47KT 4477 8511 

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

$$

JZ
276 
WWUS53 KAPX 112310 RRA
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
710 PM EDT Wed Aug 11 2021

MIC009-079-112320-
/O.EXP.KAPX.SV.W.0040.000000T0000Z-210811T2315Z/
Antrim MI-Kalkaska MI-
710 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ANTRIM AND NORTHERN
KALKASKA COUNTIES WILL EXPIRE AT 715 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Michigan.

LAT...LON 4492 8533 4497 8490 4467 8489 4467 8532
TIME...MOT...LOC 2310Z 262DEG 56KT 4475 8527 

$$

MG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 9:00 PM EDTSpecial Marine WarningAPX2 hr
Aug 10, 9:44 PM EDTSevere Thunderstorm WarningAPXAntrim, Charlevoix46 min
Aug 10, 10:04 PM EDTSevere Thunderstorm WarningAPXBenzie, Grand Traverse, Leelanau, Manistee, Wexford41 min
Aug 10, 10:30 PM EDTSevere Thunderstorm WarningAPXAntrim, Kalkaska30 min
Aug 10, 10:45 PM EDTSevere Thunderstorm Warning Considerable damage threatAPXBenzie, Grand Traverse, Kalkaska, Leelanau, Missaukee, Wexford45 min
Aug 10, 10:52 PM EDTFlash Flood WarningAPXAntrim, Grand Traverse3 hr
Aug 10, 10:58 PM EDTSevere Thunderstorm WarningAPXAntrim, Crawford, Kalkaska, Otsego32 min
Aug 10, 11:24 PM EDTSevere Thunderstorm WarningAPXAntrim, Crawford, Kalkaska, Otsego51 min
Aug 10, 11:28 PM EDTSevere Thunderstorm WarningAPXCrawford, Kalkaska, Missaukee, Roscommon32 min
Aug 11, 12:13 AM EDTFlash Flood WarningAPXLeelanau3 hr
Aug 11, 12:28 AM EDTSevere Thunderstorm WarningAPXAlcona, Arenac, Iosco, Ogemaw, Oscoda47 min
Aug 11, 12:31 AM EDTSevere Thunderstorm WarningAPXAlcona, Alpena, Montmorency, Oscoda, Presque Isle44 min
Aug 11, 12:37 AM EDTSpecial Marine WarningAPX83 min
Aug 11, 1:46 AM EDTAreal Flood WarningAPXAntrim, Grand Traverse3 hr
Aug 11, 4:12 AM EDTSmall Craft AdvisoryAPX16 hr
Aug 11, 2:52 PM EDTSpecial Marine WarningAPX53 min
Aug 11, 2:59 PM EDTSpecial Weather StatementAPXMackinac31 min
Aug 11, 3:11 PM EDTSpecial Marine WarningAPX64 min
Aug 11, 3:18 PM EDTSpecial Weather StatementAPXChippewa42 min
Aug 11, 3:38 PM EDTSpecial Marine WarningAPX52 min
Aug 11, 3:47 PM EDTSevere Thunderstorm WarningAPXChippewa, Mackinac43 min
Aug 11, 3:58 PM EDTSpecial Marine WarningAPX92 min
Aug 11, 4:11 PM EDTSevere Thunderstorm WarningAPXChippewa, Mackinac49 min
Aug 11, 4:24 PM EDTSpecial Marine WarningAPX2 hr
Aug 11, 4:54 PM EDTSevere Thunderstorm WarningAPXCheboygan51 min
Aug 11, 5:00 PM EDTSevere Thunderstorm WarningAPXEmmet18 min
Aug 11, 5:24 PM EDTSevere Thunderstorm WarningAPXCharlevoix, Cheboygan, Emmet36 min
Aug 11, 5:28 PM EDTSpecial Marine WarningAPX2 hr
Aug 11, 5:30 PM EDTSevere Thunderstorm WarningAPXAntrim, Benzie, Grand Traverse, Kalkaska, Leelanau45 min
Aug 11, 5:43 PM EDTSevere Thunderstorm WarningAPXCheboygan, Emmet, Presque Isle47 min
Aug 11, 5:52 PM EDTSevere Thunderstorm WarningAPXCheboygan, Presque Isle38 min
Aug 11, 6:00 PM EDTSevere Thunderstorm Warning Destructive damage threatAPXBenzie, Leelanau30 min
Aug 11, 6:09 PM EDTSevere Thunderstorm WarningAPXAntrim, Crawford, Kalkaska, Otsego35 min
Aug 11, 6:26 PM EDTSpecial Marine WarningAPX34 min
Aug 11, 6:31 PM EDTSevere Thunderstorm WarningAPXCrawford, Montmorency, Oscoda, Otsego44 min
Aug 11, 6:58 PM EDTSevere Thunderstorm WarningAPXAlcona, Alpena, Presque Isle47 min
Aug 11, 7:26 PM EDTSpecial Marine WarningAPX46 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2021Every 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.