Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Gaylord, MI

August 11, 20215 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 11, 2021, 5:30 PM EDT for 5 counties in Michigan. It was in force for 45 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 11, 2021, 5:30 PM EDT (21:30 UTC)
Expired
Aug 11, 2021, 6:15 PM EDT
In force
45 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 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), 63 km from the middle of the area, began a volume at 21:31 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

TimeReportWhereRemark
Aug 11, 5:50 PM EDTTSTM WND DMGWilliamsburg, MITREES DOWN IN WILLIAMSBURG.
Aug 11, 5:53 PM EDTTSTM WND GST 512 Se Traverse City, MIASOS STATION KTVC TRAVERSE CITY - CHERRY CAPITAL 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.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.5 hours before the alert went out and 212 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.

821 
WUUS53 KAPX 112130
SVRAPX
MIC009-019-055-079-089-112215-
/O.NEW.KAPX.SV.W.0035.210811T2130Z-210811T2215Z/

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

The National Weather Service in Gaylord has issued a

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

* Until 615 PM EDT.

* At 530 PM EDT, severe thunderstorms were located along a line
  extending from near Leland to Cedar to Lake Ann, moving east at 55
  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.

* Severe thunderstorms will be near...
  Leland, Bingham and Fouch around 535 PM EDT.
  Suttons Bay, Lake Leelanau and Grawn around 540 PM EDT.
  Traverse City, Peshawbestown, Mapleton, Omena, Traverse City State 
  Park and Greilickville around 545 PM EDT.
  Old Mission around 550 PM EDT.

Other locations in the path of these severe thunderstorms include Elk
Rapids, Torch Lake, Kewadin, Williamsburg, Clam River, Rapid City,
Barker Creek, Alden, Kalkaska, Bellaire, Ellsworth, Central Lake,
Mancelona, Antrim and Darragh.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4482 8590 4499 8594 4498 8584 4507 8579
      4512 8552 4504 8552 4501 8555 4503 8548
      4501 8543 4506 8542 4514 8543 4517 8524
      4512 8522 4512 8515 4500 8495 4469 8504
      4464 8599
TIME...MOT...LOC 2130Z 257DEG 49KT 4497 8587 4486 8583 4474 8588 

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

$$

Cornish
2 follow-up statements
234 
WWUS53 KAPX 112146
SVSAPX

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

MIC019-089-112156-
/O.CAN.KAPX.SV.W.0035.000000T0000Z-210811T2215Z/
Leelanau MI-Benzie MI-
546 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR LEELANAU AND NORTHEASTERN
BENZIE COUNTIES 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 1100 PM EDT for
northern Michigan.

LAT...LON 4498 8558 4503 8548 4501 8543 4509 8542
      4514 8543 4517 8524 4512 8522 4512 8515
      4500 8495 4472 8503 4473 8563
TIME...MOT...LOC 2146Z 257DEG 49KT 4501 8562 4490 8558 4478 8563 

$$

MIC009-055-079-112215-
/O.CON.KAPX.SV.W.0035.000000T0000Z-210811T2215Z/
Grand Traverse MI-Antrim MI-Kalkaska MI-
546 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHEASTERN GRAND TRAVERSE...ANTRIM AND NORTHWESTERN KALKASKA
COUNTIES...

At 546 PM EDT, severe thunderstorms were located along a line
extending from Peshawbestown to near Mapleton to Greilickville,
moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Mapleton and Old Mission around 550 PM EDT.

Other locations in the path of these severe thunderstorms include Elk
Rapids, Torch Lake, Clam River, Kewadin, Alden, Barker Creek,
Williamsburg, Bellaire, Central Lake, Rapid City, Kalkaska,
Ellsworth, Antrim, Darragh and Mancelona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4498 8558 4503 8548 4501 8543 4509 8542
      4514 8543 4517 8524 4512 8522 4512 8515
      4500 8495 4472 8503 4473 8563
TIME...MOT...LOC 2146Z 257DEG 49KT 4501 8562 4490 8558 4478 8563 

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

$$

Cornish
009 
WWUS53 KAPX 112202
SVSAPX

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

MIC055-112211-
/O.CAN.KAPX.SV.W.0035.000000T0000Z-210811T2215Z/
Grand Traverse MI-
602 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRAND TRAVERSE
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 1100 PM EDT for
northern Michigan.

LAT...LON 4488 8527 4495 8529 4503 8536 4507 8525
      4511 8513 4500 8495 4479 8501 4478 8528
TIME...MOT...LOC 2201Z 257DEG 49KT 4505 8536 4494 8532 4482 8537 

$$

MIC009-079-112215-
/O.CON.KAPX.SV.W.0035.000000T0000Z-210811T2215Z/
Antrim MI-Kalkaska MI-
602 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR CENTRAL ANTRIM AND NORTHWESTERN KALKASKA COUNTIES...

At 601 PM EDT, severe thunderstorms were located along a line
extending from Torch Lake to Clam River to near Barker Creek, moving
east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Central Lake around 605 PM EDT.

Other locations in the path of these severe thunderstorms include
Bellaire, Antrim and Mancelona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4488 8527 4495 8529 4503 8536 4507 8525
      4511 8513 4500 8495 4479 8501 4478 8528
TIME...MOT...LOC 2201Z 257DEG 49KT 4505 8536 4494 8532 4482 8537 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.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.

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, 5:43 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, 6:24 PM EDTSevere Thunderstorm Warning Considerable damage threatAPXAntrim, Benzie, Grand Traverse, Kalkaska, Leelanau51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.