Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Des Moines, IA

July 11, 2017Jasper County, Iowa

NWS Des Moines, IA issued this special weather statement at Jul 11, 2017, 4:32 AM CDT for Jasper County, Iowa. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2017, 4:32 AM CDT (09:32 UTC)
Expired: Jul 11, 2017, 5:00 AM CDT
In force: 28 min
Issued by: NWS Des Moines, IA

County Jasper County, IA

The radar

The Des Moines radar (KDMX), 50 km from the middle of the area, began a volume at 09:35 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 00:00Z, 9.5 hours before the alert went out and 225 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: 2871 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 11, 2:44 AM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Jul 11, 2:44 AM CDT, 1 hour 48 minutes before

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Hazardous weather outlook, Jul 11, 3:30 AM CDT, 1 hour 2 minutes before

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In the hours before

Special weather statement, Jul 11, 1:57 AM CDT, 2 hours 35 minutes before

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Special weather statement, Jul 11, 2:31 AM CDT, 2 hours 1 minute before

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Special weather statement, Jul 11, 3:01 AM CDT, 1 hour 31 minutes before

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Special weather statement, Jul 11, 3:34 AM CDT, 58 minutes before

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Special weather statement, Jul 11, 4:15 AM CDT, 17 minutes before

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Special weather statement, Jul 11, 4:32 AM CDT, 0 minutes before

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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, 4:21 AM CDT	Heat Advisory	DMX	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more	16 hr
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

Special Weather Statements in Iowa, 2017 Every special weather statement 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.