Alert archive / Maine / Dense Fog Advisories in 2021

Dense Fog Advisory 13, NWS Gray, ME

August 11, 2021Knox County, Waldo County, Maine

NWS Gray, ME issued this dense fog advisory at Aug 11, 2021, 7:41 PM EDT for Knox County, Waldo County, Maine. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Aug 11, 2021, 7:41 PM EDT (23:41 UTC)
Expired: Aug 12, 2021, 10:00 AM EDT
In force: 14 hr
Issued by: NWS Gray, ME

Counties Knox County, ME, Waldo County, ME

The radar

The Portland,ME radar (KGYX), 100 km from the middle of the area, began a volume at 23:43 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

Albany, NY (KALY), launched 12:00Z, 11.7 hours before the alert went out and 419 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 112 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 839 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Gray, ME wrote its last area forecast discussion before this dense fog advisory went out at Aug 11, 5:29 PM EDT, 2 hours 12 minutes earlier.

Area forecast discussion, Aug 11, 5:29 PM EDT, 2 hours 12 minutes before

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Hazardous weather outlook, Aug 11, 4:01 PM EDT, 3 hours 40 minutes before

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Nearby

Dense Fog Advisories in Maine, 2021 Every 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.