Alert archive / Iowa / Winter Weather Advisories in 2012

Winter Weather Advisory 5, NWS Des Moines, IA

February 22, 201227 counties in Iowa

NWS Des Moines, IA issued this winter weather advisory at Feb 22, 2012, 10:13 PM CST for 27 counties in Iowa. It took effect at Feb 23, 2012, 3:00 AM CST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Feb 22, 2012, 10:13 PM CST (04:13 UTC)
In effect from: Feb 23, 2012, 3:00 AM CST
Expired: Feb 23, 2012, 11:59 PM CST
In force: 21 hr
Issued by: NWS Des Moines, IA

All 27 counties

Adair County, IA, Audubon County, IA, Black Hawk County, IA, Bremer County, IA, Butler County, IA, Cass County, IA, Cerro Gordo County, IA, Dallas County, IA, Emmet County, IA, Franklin County, IA, Grundy County, IA, Guthrie County, IA, Hancock County, IA, Hardin County, IA, Jasper County, IA, Kossuth County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Wapello County, IA, Warren County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 50 km from the middle of the area, began a volume at 04:16 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 00:00Z, 4.2 hours before the alert went out and 301 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: 1004 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 150 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 winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before this winter weather advisory went out at Feb 22, 5:35 PM CST, 4 hours 38 minutes earlier.

Area forecast discussion, Feb 22, 5:35 PM CST, 4 hours 38 minutes before

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Hazardous weather outlook, Feb 22, 11:45 AM CST, 10 hours 28 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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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 Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 22, 10:13 PM CST	Winter Storm Warning	DMX	Black Hawk, Boone, Butler, Calhoun, Carroll, Crawford and 20 more	26 hr

Nearby

Winter Weather Advisories in Iowa, 2012 Every winter weather 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.