Alert archive / Iowa / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

July 15, 2021Clinton County, Iowa; Whiteside County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jul 15, 2021, 5:23 PM CDT for Clinton County, Iowa; Whiteside County, Illinois. It was in force for 37 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 15, 2021, 5:23 PM CDT (22:23 UTC)
Expired: Jul 15, 2021, 6:00 PM CDT
In force: 37 min
Issued by: NWS Quad Cities, IA

Counties Clinton County, IA, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 60 km from the middle of the area, began a volume at 22:26 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, 10.4 hours before the alert went out and 54 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: 78 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 688 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jul 15, 3:00 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, Jul 15, 3:00 PM CDT, 2 hours 23 minutes before

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Hazardous weather outlook, Jul 15, 3:17 PM CDT, 2 hours 6 minutes before

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In the hours before

Local storm report, Jul 15, 4:12 PM CDT, 1 hour 11 minutes before

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Local storm report, Jul 15, 4:16 PM CDT, 1 hour 7 minutes before

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Local storm report, Jul 15, 5:04 PM CDT, 19 minutes before

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Local storm report, Jul 15, 5:10 PM CDT, 13 minutes before

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Local storm report, Jul 15, 5:15 PM CDT, 8 minutes before

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Special weather statement, Jul 15, 5:23 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 14, 7:28 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	17 min
Jul 14, 7:37 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	38 min
Jul 14, 7:40 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	35 min
Jul 14, 7:43 PM CDT	Tornado Warning	DVN	Benton	32 min
Jul 14, 7:43 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	32 min
Jul 14, 7:53 PM CDT	Tornado Warning	DVN	Benton	27 min
Jul 14, 8:11 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	19 min
Jul 14, 8:14 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	46 min
Jul 14, 8:19 PM CDT	Tornado Warning	DVN	Benton, Linn	22 min
Jul 14, 8:31 PM CDT	Tornado Warning	DVN	Benton, Linn	29 min
Jul 14, 8:56 PM CDT	Tornado Warning	DVN	Delaware, Linn	49 min
Jul 14, 9:08 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	32 min
Jul 14, 9:29 PM CDT	Tornado Warning	DVN	Delaware, Jones	46 min
Jul 14, 10:02 PM CDT	Tornado Warning	DVN	Jones	43 min
Jul 14, 10:14 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Jones, Linn	46 min
Jul 14, 10:34 PM CDT	Tornado Warning	DVN	Cedar	26 min
Jul 14, 10:41 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	49 min
Jul 14, 10:52 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jones, Scott	38 min
Jul 14, 11:10 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	50 min
Jul 15, 8:58 AM CDT	Special Weather Statement	DVN	Henry, Jefferson	47 min
Jul 14, 11:41 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	34 min
Jul 15, 12:05 AM CDT	Severe Thunderstorm Warning	DVN	Stephenson	25 min
Jul 15, 12:07 AM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	23 min
Jul 15, 1:01 AM CDT	Special Weather Statement	DVN	Rock Island	89 min
Jul 15, 1:51 PM CDT	Special Weather Statement	DVN	McDonough	39 min
Jul 15, 2:31 PM CDT	Special Weather Statement	DVN	McDonough	29 min

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.