Alert archive / Iowa / Special Weather Statements in 2018

Special Weather Statement, NWS Quad Cities, IA

October 10, 2018Des Moines County, Lee County, Iowa; Hancock County, Henderson County, Illinois

NWS Quad Cities, IA issued this special weather statement at Oct 10, 2018, 12:08 AM CDT for Des Moines County, Lee County, Iowa; Hancock County, Henderson County, Illinois. It was in force for 67 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: Oct 10, 2018, 12:08 AM CDT (05:08 UTC)
Expired: Oct 10, 2018, 1:15 AM CDT
In force: 67 min
Issued by: NWS Quad Cities, IA

Counties Des Moines County, IA, Lee County, IA, Hancock County, IL, Henderson County, IL

The radar

The Quad Cities radar (KDVN), 144 km from the middle of the area, began a volume at 05:11 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, 5.1 hours before the alert went out and 148 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: 447 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1281 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.1

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 Oct 9, 10:18 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Oct 9, 10:18 PM CDT, 1 hour 50 minutes before

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Hazardous weather outlook, Oct 9, 4:48 PM CDT, 7 hours 20 minutes before

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In the hours before

Special weather statement, Oct 9, 10:36 PM CDT, 1 hour 32 minutes before

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Special weather statement, Oct 9, 11:22 PM CDT, 46 minutes before

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Special weather statement, Oct 10, 12:08 AM 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
Oct 9, 10:36 PM CDT	Special Weather Statement	DVN	Lee	39 min
Oct 9, 11:22 PM CDT	Special Weather Statement	DVN	Des Moines, Lee	38 min
Oct 10, 1:25 AM CDT	Special Weather Statement	DVN	Clinton, Scott	65 min
Oct 10, 6:48 AM CDT	Flash Flood Warning	DVN	Cedar, Clinton, Dubuque, Jackson, Jones, Muscatine and 1 more	6 hr
Oct 10, 6:51 AM CDT	Flash Flood Warning	DVN	Des Moines, Lee, Louisa	2 hr
Oct 10, 11:00 AM CDT	River Flood Warning	DVN	Johnson, Washington	59 hr
Oct 10, 12:35 PM CDT	Areal Flood Warning	DVN	Johnson	19 days
Oct 10, 8:00 AM CDT	Flash Flood Warning	DVN	McDonough	89 min
Oct 10, 9:05 AM CDT	Flash Flood Warning	DVN	Carroll, Jo Daviess, Stephenson	3 hr
Oct 10, 9:12 AM CDT	Special Weather Statement	DVN	Bureau, Henry, Whiteside	2 hr

Nearby

Special Weather Statements in Iowa, 2018 Special Weather Statements in Illinois, 2018 Every special weather statement in 2018

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.