Alert archive / Iowa / Heat Advisories in 2017

Heat Advisory 1, NWS Des Moines, IA

July 11, 201722 counties in Iowa

NWS Des Moines, IA issued this heat advisory at Jul 11, 2017, 4:21 AM CDT for 22 counties in Iowa. It took effect at Jul 11, 2017, 12:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 11, 2017, 4:21 AM CDT (09:21 UTC)
In effect from: Jul 11, 2017, 12:00 PM CDT
Expired: Jul 11, 2017, 8:00 PM CDT
In force: 8 hr
Issued by: NWS Des Moines, IA

All 22 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Guthrie County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 64 km from the middle of the area, began a volume at 09:25 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, 9.4 hours before the alert went out and 220 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: 2072 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 1327 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 11, 2:44 AM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, Jul 11, 2:44 AM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, Jul 11, 3:30 AM CDT, 51 minutes before

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In the hours before

Special weather statement, Jul 11, 1:20 AM CDT, 3 hours 1 minute before

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Special weather statement, Jul 11, 1:57 AM CDT, 2 hours 24 minutes before

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Special weather statement, Jul 11, 2:31 AM CDT, 1 hour 50 minutes before

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Special weather statement, Jul 11, 3:01 AM CDT, 1 hour 20 minutes before

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Special weather statement, Jul 11, 3:34 AM CDT, 47 minutes before

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      <p id="message2">
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Jul 11, 4:15 AM CDT, 6 minutes before

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      <p id="message1">
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        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 11, 1:20 AM CDT	Special Weather Statement	DMX	Crawford	40 min
Jul 11, 1:57 AM CDT	Special Weather Statement	DMX	Carroll	33 min
Jul 11, 2:31 AM CDT	Special Weather Statement	DMX	Audubon, Guthrie	44 min
Jul 11, 3:01 AM CDT	Special Weather Statement	DMX	Audubon	29 min
Jul 11, 3:34 AM CDT	Special Weather Statement	DMX	Dallas, Polk	26 min
Jul 11, 4:15 AM CDT	Special Weather Statement	DMX	Polk	15 min
Jul 11, 4:32 AM CDT	Special Weather Statement	DMX	Jasper	28 min
Jul 11, 4:58 AM CDT	Special Weather Statement	DMX	Mahaska, Marion	32 min
Jul 11, 5:28 AM CDT	Special Weather Statement	DMX	Mahaska	17 min
Jul 11, 5:42 AM CDT	Special Weather Statement	DMX	Wapello	18 min
Jul 11, 3:35 PM CDT	Heat Advisory	DMX	Adair, Adams, Appanoose, Black Hawk, Clarke, Dallas and 20 more	26 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.