Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Gaylord, MI

August 29, 2021Chippewa County, Mackinac County, Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 29, 2021, 1:39 PM EDT for Chippewa County, Mackinac County, 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 29, 2021, 1:39 PM EDT (17:39 UTC)
Expired
Aug 29, 2021, 2:30 PM EDT
In force
51 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Chippewa County, MI, Mackinac County, MI

The radar

The NCL Michigan radar (KAPX), 126 km from the middle of the area, began a volume at 17:40 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 29, 2:00 PM EDTTSTM WND GST 423 Nnw Munuscong, MIBUOY STATION WNEM4 WEST NEEBISH ISLAND, MI.
Aug 29, 2:00 PM EDTNON-TSTM WND GST 423 Nnw Munuscong, MIBUOY STATION WNEM4 WEST NEEBISH ISLAND, MI.

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 12:00Z, 5.7 hours before the alert went out and 182 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 12:00Z on 2021-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 221 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Alpena, MI at 12:00Z on 2021-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
221 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1035 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted.

290 
WUUS53 KAPX 291739
SVRAPX
MIC033-097-291830-
/O.NEW.KAPX.SV.W.0056.210829T1739Z-210829T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gaylord MI
139 PM EDT Sun Aug 29 2021

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  South central Chippewa County in eastern Michigan...
  Eastern Mackinac County in eastern Michigan...

* Until 230 PM EDT.

* At 138 PM EDT, severe thunderstorms were located along a line
  extending from near Kinross to 8 miles east of Allenville to near
  Wilderness State Park, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Barbeau and Donaldson around 150 PM EDT.
  Straits State Park around 155 PM EDT.

Other locations in the path of these severe thunderstorms include St.
Ignace, Mackinac Island, Evergreen Shores, Pickford, Kelden,
Munuscong, Hessel and Cedarville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4620 8408 4615 8401 4606 8396 4606 8390
      4608 8388 4592 8387 4591 8401 4594 8414
      4588 8443 4594 8449 4591 8456 4593 8466
      4592 8467 4585 8452 4581 8481 4583 8483
      4582 8486 4630 8440 4642 8415
TIME...MOT...LOC 1738Z 235DEG 38KT 4623 8443 4601 8465 4573 8491 

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

$$
1 follow-up statement
319 
WWUS53 KAPX 291803
SVSAPX

Severe Weather Statement
National Weather Service Gaylord MI
203 PM EDT Sun Aug 29 2021

MIC033-097-291830-
/O.CON.KAPX.SV.W.0056.000000T0000Z-210829T1830Z/
Chippewa MI-Mackinac MI-
203 PM EDT Sun Aug 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR SOUTH CENTRAL CHIPPEWA AND EAST CENTRAL MACKINAC COUNTIES...

At 203 PM EDT, severe thunderstorms were located along a line
extending from 7 miles northeast of Barbeau to near Pickford to
Mackinac Island, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Kelden, Munuscong, Cedarville, Hessel, Stalwart and Goetzville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4619 8408 4615 8401 4607 8396 4606 8390
      4608 8388 4592 8387 4591 8401 4594 8414
      4592 8431 4588 8443 4594 8449 4589 8460
      4584 8456 4583 8469 4590 8463 4590 8460
      4593 8460 4639 8414
TIME...MOT...LOC 1803Z 235DEG 38KT 4636 8417 4614 8439 4586 8465 

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

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 4:14 AM EDTSpecial Weather StatementAPXEmmet46 min
Aug 29, 5:53 AM EDTSpecial Weather StatementAPXOgemaw22 min
Aug 29, 1:28 PM EDTSpecial Marine WarningAPX47 min
Aug 29, 1:30 PM EDTSpecial Marine WarningAPX45 min
Aug 29, 1:37 PM EDTSevere Thunderstorm WarningAPXAntrim, Charlevoix, Emmet, Grand Traverse, Leelanau38 min
Aug 29, 1:58 PM EDTSevere Thunderstorm WarningAPXCheboygan, Emmet47 min
Aug 29, 2:12 PM EDTSevere Thunderstorm WarningAPXKalkaska, Missaukee, Wexford48 min
Aug 29, 2:17 PM EDTSevere Thunderstorm WarningAPXAntrim, Charlevoix, Cheboygan, Emmet, Otsego43 min
Aug 29, 2:28 PM EDTSevere Thunderstorm WarningAPXAntrim, Charlevoix, Kalkaska, Otsego32 min
Aug 29, 2:29 PM EDTSpecial Marine WarningAPX91 min
Aug 29, 2:55 PM EDTSevere Thunderstorm WarningAPXCheboygan, Montmorency, Otsego, Presque Isle35 min
Aug 29, 3:01 PM EDTSevere Thunderstorm WarningAPXCrawford, Missaukee, Oscoda, Roscommon38 min
Aug 29, 3:22 PM EDTSevere Thunderstorm WarningAPXAlpena, Montmorency, Presque Isle53 min
Aug 29, 3:31 PM EDTSpecial Marine WarningAPX89 min
Aug 29, 3:36 PM EDTSevere Thunderstorm WarningAPXOgemaw, Oscoda, Roscommon24 min
Aug 29, 5:00 PM EDTSpecial Marine WarningAPX68 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.