Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Gaylord, MI

August 11, 20215 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 11, 2021, 12:31 AM EDT for 5 counties in Michigan. It was in force for 44 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, 12:31 AM EDT (04:31 UTC)
Expired
Aug 11, 2021, 1:15 AM EDT
In force
44 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Alcona County, MI, Alpena County, MI, Montmorency County, MI, Oscoda County, MI, Presque Isle County, MI

The radar

The NCL Michigan radar (KAPX), 103 km from the middle of the area, began a volume at 04:32 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 nearest sounding before it

Alpena, MI (KAPX), launched 00:00Z, 4.5 hours before the alert went out and 81 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.

609 
WUUS53 KAPX 110431
SVRAPX
MIC001-007-119-135-141-110515-
/O.NEW.KAPX.SV.W.0029.210811T0431Z-210811T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
1231 AM EDT Wed Aug 11 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Northern Alcona County in northern Michigan...
  Alpena County in northern Michigan...
  Southeastern Presque Isle County in northern Michigan...
  Southeastern Montmorency County in northern Michigan...
  Northeastern Oscoda County in northern Michigan...

* Until 115 AM EDT.

* At 1231 AM EDT, severe thunderstorms were located along a line
  extending from near Atlanta to near McKinley, 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.

* Severe thunderstorms will be near...
  Curran around 1240 AM EDT.
  Hillman around 1250 AM EDT.

Other locations in the path of these severe thunderstorms include
Royston, Bisma Township, Ossineke Township, Hubbard Lake, The Town Of
Hubbard Lake, Metz, Spruce, Posen, Hagensville, Ossineke and
Thompsons Harbor State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4500 8320 4499 8326 4502 8338 4498 8336
      4495 8338 4494 8330 4485 8324 4473 8323
      4463 8402 4499 8427 4542 8370 4539 8364
      4539 8350 4526 8334 4523 8335 4521 8328
      4510 8325 4508 8319
TIME...MOT...LOC 0431Z 230DEG 36KT 4504 8417 4468 8393 

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

$$

Cornish
2 follow-up statements
464 
WWUS53 KAPX 110450
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
1250 AM EDT Wed Aug 11 2021

MIC135-110500-
/O.CAN.KAPX.SV.W.0029.000000T0000Z-210811T0515Z/
Oscoda MI-
1250 AM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN 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 4500 8320 4499 8326 4502 8338 4498 8336
      4495 8338 4494 8330 4485 8324 4473 8323
      4467 8384 4476 8389 4485 8389 4486 8396
      4502 8406 4538 8361 4539 8350 4526 8334
      4523 8335 4521 8328 4510 8325 4508 8319
TIME...MOT...LOC 0450Z 244DEG 35KT 4510 8393 4474 8369 

$$

MIC001-007-119-141-110515-
/O.CON.KAPX.SV.W.0029.000000T0000Z-210811T0515Z/
Alcona MI-Alpena MI-Presque Isle MI-Montmorency MI-
1250 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR NORTHERN ALCONA...ALPENA...SOUTHEASTERN PRESQUE ISLE AND
SOUTHEASTERN MONTMORENCY COUNTIES...

At 1250 AM EDT, severe thunderstorms were located along a line
extending from near Hillman to near Curran, 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...
  Lachine, The Town Of Hubbard Lake, Long Rapids, Hubbard Lake, Lost 
  Lake Woods, Spruce, Ossineke, Posen, Cathro, Negwegon State Park, 
  Black River, Lakewood, Thompsons Harbor State Park, Presque Isle 
  Light and Presque Isle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4500 8320 4499 8326 4502 8338 4498 8336
      4495 8338 4494 8330 4485 8324 4473 8323
      4467 8384 4476 8389 4485 8389 4486 8396
      4502 8406 4538 8361 4539 8350 4526 8334
      4523 8335 4521 8328 4510 8325 4508 8319
TIME...MOT...LOC 0450Z 244DEG 35KT 4510 8393 4474 8369 

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

$$

Cornish
427 
WWUS53 KAPX 110504
SVSAPX

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

MIC119-141-110514-
/O.CAN.KAPX.SV.W.0029.000000T0000Z-210811T0515Z/
Presque Isle MI-Montmorency MI-
104 AM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PRESQUE ISLE AND
SOUTHEASTERN MONTMORENCY COUNTIES IS CANCELLED...

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

LAT...LON 4500 8320 4499 8326 4502 8338 4498 8336
      4495 8338 4494 8330 4485 8324 4473 8323
      4469 8367 4477 8369 4495 8384 4502 8381
      4521 8347 4521 8339 4524 8341 4527 8336
      4523 8335 4521 8328 4510 8325 4508 8319
TIME...MOT...LOC 0504Z 259DEG 30KT 4504 8376 4468 8352 

$$

MIC001-007-110515-
/O.CON.KAPX.SV.W.0029.000000T0000Z-210811T0515Z/
Alcona MI-Alpena MI-
104 AM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM EDT
FOR NORTHEASTERN ALCONA AND ALPENA COUNTIES...

At 104 AM EDT, severe thunderstorms were located along a line
extending from near Lachine to near Barton City, moving east at 35
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Alpena, Ossineke, The Town Of Hubbard Lake, Spruce, Ossineke
Township, Hubbard Lake, Spratt, Negwegon State Park, Cathro,
Lakewood, Black River, Lost Lake Woods and Devils Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4500 8320 4499 8326 4502 8338 4498 8336
      4495 8338 4494 8330 4485 8324 4473 8323
      4469 8367 4477 8369 4495 8384 4502 8381
      4521 8347 4521 8339 4524 8341 4527 8336
      4523 8335 4521 8328 4510 8325 4508 8319
TIME...MOT...LOC 0504Z 259DEG 30KT 4504 8376 4468 8352 

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, 12:37 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.