Alert archive / Minnesota / Dense Fog Advisories in 2014

Dense Fog Advisory 1, NWS Twin Cities, MN

March 20, 201420 counties in Minnesota

NWS Twin Cities, MN issued this dense fog advisory at Mar 20, 2014, 8:41 AM CDT for 20 counties in Minnesota. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Mar 20, 2014, 8:41 AM CDT (13:41 UTC)
Expired
Mar 20, 2014, 12:38 PM CDT
In force
4 hr
Issued by
NWS Twin Cities, MN

Counties Benton County, MN, Blue Earth County, MN, Douglas County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Kandiyohi County, MN, Le Sueur County, MN, Martin County, MN, Meeker County, MN, Morrison County, MN, Pope County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Stearns County, MN, Steele County, MN, Todd County, MN, Waseca County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 45 km from the middle of the area, began a volume at 13:40 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

Aberdeen, SD (KABR), launched 12:00Z, 1.7 hours before the alert went out and 337 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, Aberdeen, SD at 12:00Z on 2014-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Aberdeen, SD at 12:00Z on 2014-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1426 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 20, 5:46 AM CDTFreezing Fog AdvisoryMPXAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 28 more3 hr

Nearby

Dense Fog Advisories in Minnesota, 2014Every dense fog advisory in 2014

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.