Alert archive / Michigan / Dense Fog Advisories in 2021

Dense Fog Advisory 1, NWS Gaylord, MI

August 10, 20218 counties in Michigan

NWS Gaylord, MI issued this dense fog advisory at Aug 10, 2021, 2:32 AM EDT for 8 counties in Michigan. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Aug 10, 2021, 2:32 AM EDT (06:32 UTC)
Expired
Aug 10, 2021, 9:00 AM EDT
In force
6 hr
Issued by
NWS Gaylord, MI

Counties Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Chippewa County, MI, Emmet County, MI, Leelanau County, MI, Mackinac County, MI, Manistee County, MI

The radar

The NCL Michigan radar (KAPX), 66 km from the middle of the area, began a volume at 06:34 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

Detroit, MI (KDTX), launched 00:00Z, 6.5 hours before the alert went out and 323 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, Detroit, MI at 00:00Z on 2021-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 532 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, Detroit, MI at 00:00Z on 2021-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
532 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
924 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gaylord, MI wrote its last area forecast discussion before this dense fog advisory went out at Aug 10, 2:15 AM EDT, 17 minutes earlier.

Area forecast discussion, Aug 10, 2:15 AM EDT, 17 minutes before
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Hazardous weather outlook, Aug 9, 2:23 PM EDT, 12 hours 9 minutes before
Hazardous Weather Outlook
National Weather Service Gaylord MI
223 PM EDT Mon Aug 9 2021

MIZ016>018-020>036-041-042-086>088-095>099-101200-
Emmet-Cheboygan-Presque Isle-Leelanau-Antrim-Otsego-Montmorency-
Alpena-Benzie-Grand Traverse-Kalkaska-Crawford-Oscoda-Alcona-
Manistee-Wexford-Missaukee-Roscommon-Ogemaw-Iosco-Gladwin-Arenac-
Western Chippewa-Central Chippewa-Southeast Chippewa-
Western Mackinac-Eastern Mackinac-
Mackinac Island/Bois Blanc Island-
Beaver Island and surrounding islands-Charlevoix-
223 PM EDT Mon Aug 9 2021

This hazardous weather outlook is for Eastern Upper Michigan and
Northern Lower Michigan.

.DAY ONE...Through tonight.

Scattered to numerous thunderstorms are expected across northern
Michigan through tonight. While the chance for severe storms is
rather small, a few storms may be able to produce some decent hail
and fairly gusty erratic winds. Locally heavy rainfall totals are
possible, mainly in northern lower Michigan.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

There will be additional thunderstorm chances Tuesday through
Thursday night. There is a chance for a few storms to be severe,
with damaging winds and large hail being the primary threats.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any significant weather and
rainfall amounts to the National Weather Service. Reports may be
made one of three ways:

Online:   weather.gov/gaylord
Facebook: facebook.com/nwsgaylord
Twitter: twitter.com/nwsgaylord

For more information visit http://weather.gov/gaylord.

LHZ345>349-LMZ323-341-342-344>346-LSZ321-322-101200-
Straits of Mackinac within 5 nm of Mackinac Bridge including
Mackinac Island-St Ignace to False Detour Channel-
5NM East of Mackinac Bridge to Presque Isle Light MI including
Bois Blanc Island-
Presque Isle Light to Sturgeon Pt MI Including Thunder Bay
National Marine Sanctuary-Sturgeon Pt to Alabaster MI-
Grand Traverse Bay south of a line Grand Traverse Light to
Norwood MI-Seul Choix Point to 5NM West of Mackinac Bridge-
Norwood MI to 5NM West of Mackinac Bridge including Little
Traverse Bay-Sleeping Bear Point to Grand Traverse Light MI-
Point Betsie to Sleeping Bear Point MI-
Manistee to Point Betsie MI-
Whitefish Bay (U.S. Portion)/Whitefish Point to Point Iroquois MI-
St. Marys River Point Iroquois to E. Potagannissing Bay-
223 PM EDT Mon Aug 9 2021

This hazardous weather outlook is for the northern Michigan
nearshore waters of Lake Huron, Lake Michigan and Lake Superior.

.DAY ONE...Through tonight.

Scattered to numerous thunderstorms are expected across northern
Michigan through tonight. While the chance for severe storms is
rather small, a few storms may be able to produce some decent hail
and fairly gusty erratic winds this afternoon and early this
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

There will be additional thunderstorm chances Tuesday through
Thursday night. There is a chance for a few storms to be severe,
with damaging winds and large hail being the primary threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

For more information visit http://weather.gov/gaylord.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 6:13 PM EDTSpecial Marine WarningAPX92 min
Aug 10, 6:58 PM EDTSpecial Weather StatementAPXCharlevoix47 min
Aug 10, 7:17 PM EDTSpecial Marine WarningAPX88 min

Nearby

Dense Fog Advisories in Michigan, 2021Every dense fog advisory 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.