Alert archive / Alabama / Dense Fog Advisories in 2012

Dense Fog Advisory 1, NWS Mobile, AL

January 1, 2012Covington County, Escambia County, Alabama

NWS Mobile, AL issued this dense fog advisory at Jan 1, 2012, 6:42 AM CST for Covington County, Escambia County, Alabama. It took effect at Jan 1, 2012, 7:00 AM CST. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jan 1, 2012, 6:42 AM CST (12:42 UTC)
In effect from: Jan 1, 2012, 7:00 AM CST
Expired: Jan 1, 2012, 9:00 AM CST
In force: 2 hr
Issued by: NWS Mobile, AL

Counties Covington County, AL, Escambia County, AL

The radar

The Eglin Afb radar (KEVX), 109 km from the middle of the area, began a volume at 12:43 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

Birmingham, AL (KBMX), launched 12:00Z, 0.7 hours before the alert went out and 222 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: 23 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 214 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 Mobile, AL wrote its last area forecast discussion before this dense fog advisory went out at Jan 1, 4:00 AM CST, 2 hours 42 minutes earlier.

Area forecast discussion, Jan 1, 4:00 AM CST, 2 hours 42 minutes before

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Hazardous weather outlook, Jan 1, 4:30 AM CST, 2 hours 12 minutes before

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The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 8:45 PM CST	Dense Fog Advisory	MOB	Butler, Clarke, Conecuh, Covington, Crenshaw, Escambia and 2 more	360 days
Dec 31, 11:19 PM CST	Marine Dense Fog Advisory	MOB		11 hr
Dec 31, 11:19 PM CST	Small Craft Advisory	MOB		58 hr
Jan 1, 6:05 AM CST	Fire Weather Watch	MOB	Butler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more	31 hr

Nearby

Dense Fog Advisories in Alabama, 2012 Dense Fog Advisories in Florida, 2012 Every dense fog advisory in 2012

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.