Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 28, NWS Gaylord, MI

August 11, 20215 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 11, 2021, 12:28 AM EDT for 5 counties in Michigan. It was in force for 47 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, 12:28 AM EDT (04:28 UTC)
Expired
Aug 11, 2021, 1:15 AM EDT
In force
47 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Alcona County, MI, Arenac County, MI, Iosco County, MI, Ogemaw County, MI, Oscoda County, MI

The radar

The NCL Michigan radar (KAPX), 113 km from the middle of the area, began a volume at 04:27 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, 12:30 AM EDTTSTM WND DMGAlger, MIDELAYED REPORT. MULTIPLE REPORTS OF TREES AND POWERLINES DOWN THROUGHOUT THE COUNTY. ROOF BLOWN OFF OF A BARN AS WELL.
Aug 11, 12:30 AM EDTTSTM WND DMGPrescott, MINUMEROUS TREES AND POWER LINES DOWN IN SKIDWAY/PRESCOTT AREA OF COUNTY.

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

The nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 4.5 hours before the alert went out and 136 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, Alpena, MI at 00:00Z on 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 579 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, Alpena, MI at 00:00Z on 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 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
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.

047 
WUUS53 KAPX 110428
SVRAPX
MIC001-011-069-129-135-110515-
/O.NEW.KAPX.SV.W.0028.210811T0428Z-210811T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
1228 AM EDT Wed Aug 11 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Southern Alcona County in northern Michigan...
  Arenac County in northern Michigan...
  Eastern Ogemaw County in northern Michigan...
  Iosco County in northern Michigan...
  Southeastern Oscoda County in northern Michigan...

* Until 115 AM EDT.

* At 1227 AM EDT, severe thunderstorms were located along a line
  extending from near McKinley to Selkirk to 7 miles south of Rhodes,
  moving east at 50 mph.

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

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  McKinley, Curtisville and Rifle River State Park around 1235 AM 
  EDT.
  Long Lake around 1240 AM EDT.
  Glennie, Whittemore and Hale around 1245 AM EDT.

Other locations in the path of these severe thunderstorms include
Plainfield Township, Barton City, National City, Tawas City, Mikado,
Lincoln, East Tawas, Tawas Point State Park, Harrisville, Harrisville
State Park, Wurtsmith Airfield, Oscoda and Au Sable.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4461 8326 4430 8332 4425 8339 4422 8350
      4418 8351 4418 8356 4405 8358 4405 8365
      4402 8369 4399 8368 4400 8383 4391 8391
      4391 8404 4400 8405 4400 8417 4430 8418
      4465 8404 4475 8325 4471 8322
TIME...MOT...LOC 0427Z 264DEG 43KT 4458 8396 4430 8408 4380 8420 

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

$$

Cornish
2 follow-up statements
356 
WWUS53 KAPX 110448
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
1248 AM EDT Wed Aug 11 2021

MIC135-110457-
/O.CAN.KAPX.SV.W.0028.000000T0000Z-210811T0515Z/
Oscoda MI-
1248 AM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OSCODA COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4461 8326 4430 8332 4425 8339 4422 8350
      4418 8351 4418 8356 4405 8358 4405 8366
      4402 8369 4399 8368 4400 8387 4415 8399
      4442 8396 4451 8392 4451 8389 4458 8389
      4468 8384 4475 8325 4471 8322
TIME...MOT...LOC 0447Z 268DEG 37KT 4462 8378 4435 8381 4412 8378 

$$

MIC001-011-069-129-110515-
/O.CON.KAPX.SV.W.0028.000000T0000Z-210811T0515Z/
Alcona MI-Arenac MI-Ogemaw MI-Iosco MI-
1248 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR SOUTHERN ALCONA...NORTHEASTERN ARENAC...EASTERN OGEMAW AND IOSCO
COUNTIES...

At 1247 AM EDT, severe thunderstorms were located along a line
extending from near Glennie to near Hale to Twining, moving east at
45 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Glennie, Long Lake, National City, Au Gres, Plainfield Township, 
  Barton City, Tawas City, East Tawas, Mikado, Tawas Point State 
  Park, Lincoln, Wurtsmith Airfield, Oscoda, Harrisville, Au Sable 
  and Harrisville State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4461 8326 4430 8332 4425 8339 4422 8350
      4418 8351 4418 8356 4405 8358 4405 8366
      4402 8369 4399 8368 4400 8387 4415 8399
      4442 8396 4451 8392 4451 8389 4458 8389
      4468 8384 4475 8325 4471 8322
TIME...MOT...LOC 0447Z 268DEG 37KT 4462 8378 4435 8381 4412 8378 

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

$$

Cornish
814 
WWUS53 KAPX 110502
SVSAPX

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

MIC129-110511-
/O.CAN.KAPX.SV.W.0028.000000T0000Z-210811T0515Z/
Ogemaw MI-
102 AM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OGEMAW COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4461 8326 4430 8332 4425 8339 4422 8350
      4418 8351 4418 8356 4409 8359 4405 8358
      4405 8366 4418 8366 4431 8363 4443 8371
      4462 8367 4470 8368 4475 8325 4471 8322
TIME...MOT...LOC 0501Z 270DEG 43KT 4464 8357 4437 8360 4414 8357 

$$

MIC001-011-069-110515-
/O.CON.KAPX.SV.W.0028.000000T0000Z-210811T0515Z/
Alcona MI-Arenac MI-Iosco MI-
102 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR SOUTHEASTERN ALCONA...NORTHEASTERN ARENAC AND EASTERN IOSCO
COUNTIES...

At 101 AM EDT, severe thunderstorms were located along a line
extending from near Barton City to near Plainfield Township to 8
miles northeast of Au Gres, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Oscoda, East Tawas, Tawas City, Harrisville, Au Sable, Mikado,
Lincoln, Tawas Point State Park, Harrisville State Park, Wurtsmith
Airfield, Barton City, Wilber and Sid Town.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4461 8326 4430 8332 4425 8339 4422 8350
      4418 8351 4418 8356 4409 8359 4405 8358
      4405 8366 4418 8366 4431 8363 4443 8371
      4462 8367 4470 8368 4475 8325 4471 8322
TIME...MOT...LOC 0501Z 270DEG 43KT 4464 8357 4437 8360 4414 8357 

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, 12:31 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, 6:24 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.