Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

August 31, 2021Louisa County, Iowa; Mercer County, Illinois

NWS Quad Cities, IA issued this special weather statement at Aug 31, 2021, 3:41 PM CDT for Louisa County, Iowa; Mercer County, Illinois. It was in force for 64 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: Aug 31, 2021, 3:41 PM CDT (20:41 UTC)
Expired: Aug 31, 2021, 4:45 PM CDT
In force: 64 min
Issued by: NWS Quad Cities, IA
Hail: 0.00 in
Wind: 30

Counties Louisa County, IA, Mercer County, IL

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 20:40 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, 8.7 hours before the alert went out and 72 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1564 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 31, 3:11 PM CDT, 30 minutes earlier.

Area forecast discussion, Aug 31, 3:11 PM CDT, 30 minutes before

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Hazardous weather outlook, Aug 31, 3:19 PM CDT, 22 minutes before

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In the hours before

Local storm report, Aug 31, 2:37 PM CDT, 1 hour 4 minutes before

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Special weather statement, Aug 31, 2:46 PM CDT, 55 minutes before

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Local storm report, Aug 31, 2:56 PM CDT, 45 minutes before

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Local storm report, Aug 31, 3:01 PM CDT, 40 minutes before

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Local storm report, Aug 31, 3:29 PM CDT, 12 minutes before

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Special weather statement, Aug 31, 3:41 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
Aug 31, 2:46 PM CDT	Special Weather Statement	DVN	Scott	59 min
Aug 31, 3:09 PM CDT	Flash Flood Warning	DVN	Scott	2 hr
Aug 31, 1:17 PM CDT	Special Weather Statement	DVN	Rock Island	58 min
Aug 31, 1:22 PM CDT	Special Weather Statement	DVN	Rock Island	23 min
Aug 31, 2:01 PM CDT	Flash Flood Warning	DVN	Henry, Mercer, Rock Island	6 hr
Aug 31, 3:49 PM CDT	Flash Flood Warning	DVN	Henry, Mercer	4 hr

Nearby

Special Weather Statements in Iowa, 2021 Special Weather Statements in Illinois, 2021 Every special weather statement in 2021

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.