Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 61, NWS Gaylord, MI

August 29, 20214 counties in Michigan

NWS Gaylord, MI issued this severe thunderstorm warning at Aug 29, 2021, 2:55 PM EDT for 4 counties in Michigan. It was in force for 35 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 29, 2021, 2:55 PM EDT (18:55 UTC)
Expired
Aug 29, 2021, 3:30 PM EDT
In force
35 min
Issued by
NWS Gaylord, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Cheboygan County, MI, Montmorency County, MI, Otsego County, MI, Presque Isle County, MI

The radar

The NCL Michigan radar (KAPX), 53 km from the middle of the area, began a volume at 18:57 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 29, 1:46 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Alpena, MI (KAPX), launched 12:00Z, 6.9 hours before the alert went out and 144 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.

444 
WUUS53 KAPX 291855
SVRAPX
MIC031-119-137-141-291930-
/O.NEW.KAPX.SV.W.0061.210829T1855Z-210829T1930Z/

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

The National Weather Service in Gaylord has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cheboygan County in northern Michigan...
  Southwestern Presque Isle County in northern Michigan...
  Otsego County in northern Michigan...
  Western Montmorency County in northern Michigan...

* Until 330 PM EDT.

* At 254 PM EDT, severe thunderstorms were located along a line
  extending from near Wolverine to near Vanderbilt to near Waters,
  moving northeast at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Wolverine and Afton around 300 PM EDT.
  Pickerel Lake and Eastern Corwith Township around 305 PM EDT.
  Johannesburg and Tower around 310 PM EDT.

Other locations in the path of these severe thunderstorms include
Hetherton, Ocqueoc, Allis Township, Tomahawk Creek Flooding, Onaway,
Briley Township, Atlanta, Millersburg, Canada Creek Ranch and Forty
Mile Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4550 8390 4537 8398 4486 8416 4486 8481
      4531 8461
TIME...MOT...LOC 1854Z 240DEG 48KT 4530 8457 4511 8464 4489 8474 

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

$$
1 follow-up statement
315 
WWUS53 KAPX 291914
SVSAPX

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

MIC031-119-137-141-291930-
/O.CON.KAPX.SV.W.0061.000000T0000Z-210829T1930Z/
Cheboygan MI-Presque Isle MI-Otsego MI-Montmorency MI-
314 PM EDT Sun Aug 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHEASTERN CHEBOYGAN...SOUTHWESTERN PRESQUE ISLE...EASTERN
OTSEGO AND WESTERN MONTMORENCY COUNTIES...

At 314 PM EDT, severe thunderstorms were located along a line
extending from near Onaway State Park to 6 miles west of Allis
Township to near Lewiston, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Onaway, Allis Township, Ocqueoc, Millersburg, Tomahawk Creek 
  Flooding, Canada Creek Ranch and Forty Mile Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4537 8398 4487 8415 4486 8447 4522 8444
      4538 8436 4550 8390
TIME...MOT...LOC 1914Z 269DEG 48KT 4542 8428 4523 8435 4487 8436 

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, 1:39 PM EDTSevere Thunderstorm WarningAPXChippewa, Mackinac51 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.