Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

July 21, 20174 counties in Iowa

NWS Quad Cities, IA issued this special weather statement at Jul 21, 2017, 5:10 AM CDT for 4 counties in Iowa. It was in force for 65 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 21, 2017, 5:10 AM CDT (10:10 UTC)
Expired: Jul 21, 2017, 6:15 AM CDT
In force: 65 min
Issued by: NWS Quad Cities, IA

Counties Buchanan County, IA, Cedar County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 66 km from the middle of the area, began a volume at 10:13 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, 10.2 hours before the alert went out and 71 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: 2392 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1284 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 7.0

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 Jul 21, 3:56 AM CDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 21, 3:56 AM CDT, 1 hour 14 minutes before

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Hazardous weather outlook, Jul 21, 4:45 AM CDT, 25 minutes before

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In the hours before

Local storm report, Jul 20, 11:53 PM CDT, 5 hours 17 minutes before

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Special weather statement, Jul 21, 12:29 AM CDT, 4 hours 41 minutes before

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Special weather statement, Jul 21, 12:40 AM CDT, 4 hours 30 minutes before

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Special weather statement, Jul 21, 1:27 AM CDT, 3 hours 43 minutes before

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Special weather statement, Jul 21, 2:25 AM CDT, 2 hours 45 minutes before

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Special weather statement, Jul 21, 5:10 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
Jul 20, 7:05 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry	40 min
Jul 20, 7:37 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson	53 min
Jul 20, 7:56 PM CDT	Flash Flood Warning	DVN	Henry, Jefferson	6 hr
Jul 20, 8:27 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson	46 min
Jul 20, 8:45 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	31 min
Jul 20, 8:58 PM CDT	Flash Flood Warning	DVN	Henry, Jefferson, Louisa, Muscatine, Washington	6 hr
Jul 20, 9:44 PM CDT	Severe Thunderstorm Warning	DVN	Muscatine, Scott	46 min
Jul 20, 9:46 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk, Washington	30 min
Jul 20, 10:13 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	45 min
Jul 20, 10:39 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	35 min
Jul 20, 11:39 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Keokuk	27 min
Jul 21, 12:40 AM CDT	Special Weather Statement	DVN	Cedar, Johnson, Muscatine	65 min
Jul 21, 1:27 AM CDT	Special Weather Statement	DVN	Scott	63 min
Jul 21, 2:56 PM CDT	River Flood Watch	DVN	Delaware, Jones	67 hr
Jul 21, 2:56 PM CDT	River Flood Watch	DVN	Jackson	4 days
Jul 21, 2:56 PM CDT	River Flood Watch	DVN	Buchanan, Linn	5 days
Jul 21, 3:51 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Washington	54 min
Jul 21, 4:39 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson	66 min
Jul 21, 4:49 PM CDT	Tornado Warning	DVN	Johnson	56 min
Jul 21, 5:01 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Jones, Linn	59 min
Jul 21, 5:16 PM CDT	Flash Flood Warning	DVN	Cedar, Johnson, Jones, Linn	6 hr
Jul 21, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	37 min
Jul 21, 5:39 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Muscatine	51 min
Jul 21, 6:10 PM CDT	Tornado Warning	DVN	Muscatine	50 min
Jul 21, 6:50 PM CDT	Special Weather Statement	DVN	Clinton, Scott	55 min
Jul 21, 12:29 AM CDT	Special Weather Statement	DVN	Putnam	31 min
Jul 21, 2:25 AM CDT	Special Weather Statement	DVN	Bureau, Henry	65 min
Jul 21, 5:50 PM CDT	Special Weather Statement	DVN	Stephenson	40 min
Jul 21, 6:15 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	45 min
Jul 21, 6:56 PM CDT	Special Weather Statement	DVN	Henry, Mercer	64 min

Nearby

Special Weather Statements in Iowa, 2017 Every special weather statement in 2017

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.