Alert archive / Iowa / Winter Storm Watches in 2013

Winter Storm Watch 4, NWS Des Moines, IA

February 24, 201311 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Feb 24, 2013, 3:45 AM CST for 11 counties in Iowa. It took effect at Feb 26, 2013, 12:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 24, 2013, 3:45 AM CST (09:45 UTC)
In effect from: Feb 26, 2013, 12:00 AM CST
Expired: Feb 25, 2013, 4:15 PM CST
In force
Issued by: NWS Des Moines, IA

Counties Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Wapello County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 98 km from the middle of the area, began a volume at 09:43 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

Topeka, KS (KTOP), launched 00:00Z, 9.8 hours before the alert went out and 303 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: 1213 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 154 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 storm watch 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 storm watch went out at Feb 24, 3:22 AM CST, 23 minutes earlier.

Area forecast discussion, Feb 24, 3:22 AM CST, 23 minutes before

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In the hours before

Special weather statement, Feb 23, 11:12 PM CST, 4 hours 33 minutes before

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Special weather statement, Feb 24, 1:13 AM CST, 2 hours 32 minutes before

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</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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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 24, 4:17 AM CST	Dense Fog Advisory	DMX	Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 14 more	3 hr

Nearby

Winter Storm Watches in Iowa, 2013 Every winter storm watch in 2013

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.