Alert archive / Minnesota / Dense Fog Advisories in 2009

Dense Fog Advisory 2, NWS Twin Cities, MN

March 9, 200930 counties in Minnesota; 4 counties in Wisconsin

NWS Twin Cities, MN issued this dense fog advisory at Mar 9, 2009, 8:51 AM CDT for 30 counties in Minnesota; 4 counties in Wisconsin. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Mar 9, 2009, 8:51 AM CDT (13:51 UTC)
Expired: Mar 9, 2009, 1:00 PM CDT
In force: 4 hr
Issued by: NWS Twin Cities, MN

All 34 counties

Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Dunn County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 36 km from the middle of the area, began a volume at 13:52 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, 1.9 hours before the alert went out and 359 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 448 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 434 m²/s²
0-3 km storm-relative helicity: 527 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 Twin Cities, MN wrote its last area forecast discussion before this dense fog advisory went out at Mar 9, 5:54 AM CDT, 2 hours 57 minutes earlier.

Area forecast discussion, Mar 9, 5:54 AM CDT, 2 hours 57 minutes before

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Hazardous weather outlook, Mar 9, 7:40 AM CDT, 1 hour 11 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 9, 3:37 AM CDT	Blizzard Watch	MPX	Chippewa, Douglas, Lac qui Parle, Pope, Stevens, Swift and 1 more	13 hr
Mar 9, 2:47 PM CDT	Blizzard Warning	MPX	Chippewa, Douglas, Lac qui Parle, Pope, Stevens, Swift and 1 more	37 hr
Mar 9, 2:47 PM CDT	Winter Storm Warning	MPX	Anoka, Benton, Brown, Carver, Chisago, Hennepin and 16 more	37 hr
Mar 9, 2:47 PM CDT	Winter Weather Advisory	MPX	Anoka, Blue Earth, Carver, Chisago, Dakota, Faribault and 13 more	37 hr

Nearby

Dense Fog Advisories in Minnesota, 2009 Dense Fog Advisories in Wisconsin, 2009 Every dense fog advisory in 2009

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.