Alert archive / Iowa / Heat Advisories in 2011

Heat Advisory 5, NWS Quad Cities, IA

July 22, 20118 counties in Iowa; Carroll County, Jo Daviess County, Stephenson County, Illinois

NWS Quad Cities, IA issued this heat advisory at Jul 22, 2011, 3:59 PM CDT for 8 counties in Iowa; Carroll County, Jo Daviess County, Stephenson County, Illinois. It took effect at Jul 23, 2011, 1:00 PM CDT. It was in force for 101 min.

The area

The counties it named.

The facts

Issued: Jul 22, 2011, 3:59 PM CDT (20:59 UTC)
In effect from: Jul 23, 2011, 1:00 PM CDT
Expired: Jul 23, 2011, 2:41 PM CDT
In force: 101 min
Issued by: NWS Quad Cities, IA

Counties Benton County, IA, Buchanan County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 21:00 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

Davenport, (KDVN), launched 12:00Z, 9.0 hours before the alert went out and 75 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: 2442 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1188 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 Quad Cities, IA wrote its last area forecast discussion before this heat advisory went out at Jul 22, 3:35 PM CDT, 24 minutes earlier.

Area forecast discussion, Jul 22, 3:35 PM CDT, 24 minutes before

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Hazardous weather outlook, Jul 22, 5:06 AM CDT, 10 hours 53 minutes before

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In the hours before

Local storm report, Jul 22, 10:30 AM CDT, 5 hours 29 minutes before

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Local storm report, Jul 22, 10:33 AM CDT, 5 hours 26 minutes before

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Local storm report, Jul 22, 10:41 AM CDT, 5 hours 18 minutes before

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Local storm report, Jul 22, 12:02 PM CDT, 3 hours 57 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 7:16 PM CDT	Special Weather Statement	DVN	Louisa	59 min
Jul 21, 8:00 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk	16 min
Jul 22, 4:18 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	57 min

Nearby

Heat Advisories in Iowa, 2011 Heat Advisories in Illinois, 2011 Every heat advisory in 2011

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.