Alert archive / Iowa / Heat Advisories in 2017

Heat Advisory 4, NWS Des Moines, IA

July 22, 2017Audubon County, Cass County, Guthrie County, Iowa

NWS Des Moines, IA issued this heat advisory at Jul 22, 2017, 3:59 AM CDT for Audubon County, Cass County, Guthrie County, Iowa. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2017, 3:59 AM CDT (08:59 UTC)
Expired: Jul 22, 2017, 8:00 PM CDT
In force: 16 hr
Issued by: NWS Des Moines, IA

Counties Audubon County, IA, Cass County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 09:00 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

Omaha, NE (KOAX), launched 00:00Z, 9.0 hours before the alert went out and 135 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: 3448 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1957 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 23.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat 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 heat advisory went out at Jul 21, 6:23 PM CDT, 9 hours 36 minutes earlier.

Area forecast discussion, Jul 21, 6:23 PM CDT, 9 hours 36 minutes before

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Hazardous weather outlook, Jul 21, 5:15 PM CDT, 10 hours 44 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>
      <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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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 21, 9:58 PM CDT	Special Weather Statement	DMX	Bremer	62 min
Jul 21, 10:24 PM CDT	Flash Flood Warning	DMX	Bremer	15 hr
Jul 22, 2:04 AM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler	6 hr
Jul 22, 7:56 AM CDT	Areal Flood Warning	DMX	Bremer	24 hr
Jul 22, 2:19 PM CDT	Areal Flood Warning	DMX	Bremer	24 hr

Nearby

Heat Advisories in Iowa, 2017 Every heat advisory in 2017

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.