Alert archive / Iowa / Heat Advisories in 2011

Heat Advisory 5, NWS Des Moines, IA

July 28, 201114 counties in Iowa

NWS Des Moines, IA issued this heat advisory at Jul 28, 2011, 10:56 AM CDT for 14 counties in Iowa. It took effect at Jul 28, 2011, 12:00 PM CDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Jul 28, 2011, 10:56 AM CDT (15:56 UTC)
In effect from
Jul 28, 2011, 12:00 PM CDT
Expired
Jul 28, 2011, 10:00 PM CDT
In force
10 hr
Issued by
NWS Des Moines, IA

Counties Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 83 km from the middle of the area, began a volume at 15:59 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

Omaha, NE (KOAX), launched 12:00Z, 3.9 hours before the alert went out and 275 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2011-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2616 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2011-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -127 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2616 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
622 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-127 m²/s²
0-3 km storm-relative helicity
-81 m²/s²
Significant tornado parameter
0.0
Supercell composite
-6.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 5:18 AM CDTSevere Thunderstorm WarningDMXAudubon, Carroll, Crawford57 min
Jul 28, 6:08 AM CDTSevere Thunderstorm WarningDMXBoone, Calhoun, Carroll, Greene, Webster52 min

Nearby

Heat Advisories in Iowa, 2011Every 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.