Alert archive / Iowa / Areal Flood Warnings in 2010

Areal Flood Warning 21, NWS Des Moines, IA

July 23, 20104 counties in Iowa

NWS Des Moines, IA issued this areal flood warning at Jul 23, 2010, 6:57 AM CDT for 4 counties in Iowa. It was in force for 24 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 23, 2010, 6:57 AM CDT (11:57 UTC)
Expired: Jul 24, 2010, 7:00 AM CDT
In force: 24 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA, Grundy County, IA

The radar

The Des Moines radar (KDMX), 136 km from the middle of the area, began a volume at 11:59 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

Davenport, (KDVN), launched 00:00Z, 12.0 hours before the alert went out and 201 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: 2664 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at Jul 23, 6:24 AM CDT, 33 minutes earlier.

Area forecast discussion, Jul 23, 6:24 AM CDT, 33 minutes before

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Hazardous weather outlook, Jul 23, 4:52 AM CDT, 2 hours 5 minutes before

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In the hours before

Local storm report, Jul 23, 5:29 AM CDT, 1 hour 28 minutes before

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Local storm report, Jul 23, 5:59 AM CDT, 58 minutes before

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Local storm report, Jul 23, 6:41 AM CDT, 16 minutes before

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<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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        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
Jul 22, 9:11 PM CDT	Areal Flood Advisory	DMX	Black Hawk, Butler, Grundy	3 hr
Jul 23, 1:14 AM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler, Grundy	6 hr
Jul 23, 4:01 AM CDT	Heat Advisory	DMX	Adams, Appanoose, Clarke, Davis, Decatur, Lucas and 10 more	10 hr
Jul 23, 4:06 AM CDT	Flash Flood Watch	DMX	Appanoose, Black Hawk, Boone, Bremer, Butler, Calhoun and 35 more	27 hr
Jul 23, 4:09 AM CDT	Flash Flood Warning	DMX	Calhoun, Pocahontas, Sac, Webster	6 hr
Jul 23, 4:48 AM CDT	Flash Flood Warning	DMX	Franklin, Hamilton, Hardin, Wright	6 hr
Jul 23, 6:33 AM CDT	River Flood Warning	DMX	Webster	38 hr
Jul 23, 10:00 AM CDT	Areal Flood Warning	DMX	Sac	24 hr
Jul 23, 10:22 AM CDT	River Flood Warning	DMX	Marshall	4 days
Jul 23, 10:22 AM CDT	River Flood Warning	DMX	Black Hawk	3 days
Jul 23, 10:22 AM CDT	River Flood Warning	DMX	Black Hawk	35 hr
Jul 23, 10:22 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	5 days
Jul 23, 10:58 AM CDT	Areal Flood Warning	DMX	Franklin, Hamilton, Hardin, Wright	24 hr

Nearby

Areal Flood Warnings in Iowa, 2010 Every areal flood warning in 2010

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.