Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Des Moines, IA

September 7, 2016Boone County, Iowa

NWS Des Moines, IA issued this special weather statement at Sep 7, 2016, 10:24 PM CDT for Boone County, Iowa. It was in force for 66 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: Sep 7, 2016, 10:24 PM CDT (03:24 UTC)
Expired: Sep 7, 2016, 11:30 PM CDT
In force: 66 min
Issued by: NWS Des Moines, IA

County Boone County, IA

The radar

The Des Moines radar (KDMX), 38 km from the middle of the area, began a volume at 03:27 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, 3.4 hours before the alert went out and 273 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: 378 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

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 Sep 7, 6:45 PM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, Sep 7, 6:45 PM CDT, 3 hours 39 minutes before

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Hazardous weather outlook, Sep 7, 4:26 PM CDT, 5 hours 58 minutes before

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In the hours before

Local storm report, Sep 7, 7:09 PM CDT, 3 hours 15 minutes before

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Local storm report, Sep 7, 7:10 PM CDT, 3 hours 14 minutes before

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Special weather statement, Sep 7, 10:24 PM CDT, 0 minutes before

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Nearby

Special Weather Statements in Iowa, 2016 Every special weather statement in 2016

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.