Alert archive / Iowa / Special Weather Statements in 2016

Special Weather Statement, NWS Quad Cities, IA

July 20, 2016Clinton County, Iowa

NWS Quad Cities, IA issued this special weather statement at Jul 20, 2016, 12:35 PM CDT for Clinton County, Iowa. It was in force for 40 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 20, 2016, 12:35 PM CDT (17:35 UTC)
Expired: Jul 20, 2016, 1:15 PM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA

County Clinton County, IA

The radar

The Quad Cities radar (KDVN), 61 km from the middle of the area, began a volume at 17:38 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, 5.6 hours before the alert went out and 57 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: 143 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
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 Quad Cities, IA wrote its last area forecast discussion before this special weather statement went out at Jul 20, 12:07 PM CDT, 28 minutes earlier.

Area forecast discussion, Jul 20, 12:07 PM CDT, 28 minutes before

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Hazardous weather outlook, Jul 20, 12:08 PM CDT, 27 minutes before

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In the hours before

Local storm report, Jul 20, 6:55 AM CDT, 5 hours 40 minutes before

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Local storm report, Jul 20, 8:55 AM CDT, 3 hours 40 minutes before

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Local storm report, Jul 20, 8:58 AM CDT, 3 hours 37 minutes before

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Local storm report, Jul 20, 11:07 AM CDT, 1 hour 28 minutes before

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Local storm report, Jul 20, 11:57 AM CDT, 38 minutes before

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Special weather statement, Jul 20, 12:35 PM CDT, 0 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 20, 4:00 AM CDT	Excessive Heat Warning	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	4 days
Jul 20, 5:09 AM CDT	Flash Flood Warning	DVN	Des Moines, Louisa	6 hr
Jul 20, 6:58 AM CDT	Flash Flood Warning	DVN	Henderson, McDonough, Warren	6 hr

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.