Alert archive / Iowa / Heat Advisories in 2011

Heat Advisory 3, NWS Des Moines, IA

July 22, 201130 counties in Iowa

NWS Des Moines, IA issued this heat advisory at Jul 22, 2011, 4:12 PM CDT for 30 counties in Iowa. It took effect at Jul 23, 2011, 10:00 AM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2011, 4:12 PM CDT (21:12 UTC)
In effect from: Jul 23, 2011, 10:00 AM CDT
Expired: Jul 23, 2011, 3:42 PM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA

All 30 counties

Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 87 km from the middle of the area, began a volume at 21:12 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, 9.2 hours before the alert went out and 294 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 Des Moines, IA wrote its last area forecast discussion before this heat advisory went out at Jul 22, 4:00 PM CDT, 12 minutes earlier.

Area forecast discussion, Jul 22, 4:00 PM CDT, 12 minutes before

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Hazardous weather outlook, Jul 22, 4:54 AM CDT, 11 hours 18 minutes before

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In the hours before

Special weather statement, Jul 22, 11:53 AM CDT, 4 hours 19 minutes before

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Special weather statement, Jul 22, 12:23 PM CDT, 3 hours 49 minutes before

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Special weather statement, Jul 22, 12:56 PM CDT, 3 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1256 PM CDT FRI JUL 22 2011

IAZ034>038-046>049-221900-
CALHOUN-WEBSTER-HAMILTON-HARDIN-GRUNDY-GREENE-BOONE-STORY-
MARSHALL-
INCLUDING THE CITIES OF...ROCKWELL CITY...FORT DODGE...
WEBSTER CITY...ELDORA...GRUNDY CENTER...JEFFERSON...BOONE...
AMES...MARSHALLTOWN
1256 PM CDT FRI JUL 22 2011

...SCATTERED THUNDERSTORMS WITH GUSTY WINDS POSSIBLE...

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP DURING THE
EARLY AFTERNOON. A FEW OF THESE STORMS WILL BE CAPABLE OF
PRODUCING GUSTY WINDS UP TO 50 MPH AT TIMES. BRIEF HEAVY DOWNPOURS
ARE ALSO POSSIBLE WITH THESE STORMS.

JB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 3:40 AM CDT	Excessive Heat Warning	DMX	Adair, Adams, Appanoose, Cass, Clarke, Davis and 15 more	41 hr
Jul 22, 3:43 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Marshall, Tama	50 min
Jul 22, 6:49 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy, Hardin	56 min

Nearby

Heat Advisories in Iowa, 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.