Alert archive / Iowa / Dense Fog Advisories in 2016

Dense Fog Advisory 2, NWS La Crosse, WI

February 1, 20164 counties in Wisconsin; 8 counties in Iowa; 7 counties in Minnesota

NWS La Crosse, WI issued this dense fog advisory at Feb 1, 2016, 3:21 PM CST for 4 counties in Wisconsin; 8 counties in Iowa; 7 counties in Minnesota. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Feb 1, 2016, 3:21 PM CST (21:21 UTC)
Expired: Feb 2, 2016, 3:00 AM CST
In force: 12 hr
Issued by: NWS La Crosse, WI

Counties Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Crawford County, WI, Grant County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 67 km from the middle of the area, began a volume at 21:20 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

Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 209 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: 724 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 86 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 La Crosse, WI wrote its last area forecast discussion before this dense fog advisory went out at Feb 1, 3:00 PM CST, 21 minutes earlier.

Area forecast discussion, Feb 1, 3:00 PM CST, 21 minutes before

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Hazardous weather outlook, Feb 1, 4:30 AM CST, 10 hours 51 minutes before

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In the hours before

Special weather statement, Feb 1, 9:55 AM CST, 5 hours 26 minutes before

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Special weather statement, Feb 1, 12:06 PM CST, 3 hours 15 minutes before

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The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 1, 4:07 AM CST	Winter Storm Warning	ARX	Adams, Buffalo, Clark, Crawford, Grant, Jackson and 7 more	50 hr

Nearby

Dense Fog Advisories in Iowa, 2016 Dense Fog Advisories in Minnesota, 2016 Dense Fog Advisories in Wisconsin, 2016 Every dense fog advisory in 2016

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.