Alert archive / Alabama / Dense Fog Advisories in 2012

Dense Fog Advisory 17, NWS Mobile, AL

March 13, 201210 counties in Alabama; 5 counties in Mississippi

NWS Mobile, AL issued this dense fog advisory at Mar 13, 2012, 2:29 AM CDT for 10 counties in Alabama; 5 counties in Mississippi. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Mar 13, 2012, 2:29 AM CDT (07:29 UTC)
Expired
Mar 13, 2012, 9:54 AM CDT
In force
7 hr
Issued by
NWS Mobile, AL

Counties Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 96 km from the middle of the area, began a volume at 07:30 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.5 hours before the alert went out and 226 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, Slidell Radar S, LA at 00:00Z on 2012-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 765 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, Slidell Radar S, LA at 00:00Z on 2012-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 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
765 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
492 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 13, 2:20 AM CDTMarine Dense Fog AdvisoryMOB9 hr
Mar 13, 1:38 PM CDTAreal Flood AdvisoryMOBBaldwin52 min
Mar 13, 3:46 PM CDTMarine Dense Fog AdvisoryMOB19 hr
Mar 13, 4:34 PM CDTSevere Thunderstorm WarningMOBButler, Conecuh, Covington26 min

Nearby

Dense Fog Advisories in Alabama, 2012Dense Fog Advisories in Mississippi, 2012Dense Fog Advisories in Florida, 2012Every 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.