Alert archive / Illinois / Special Weather Statements in 2011

Special Weather Statement, NWS Quad Cities, IA

August 7, 2011Bureau County, Illinois

NWS Quad Cities, IA issued this special weather statement at Aug 7, 2011, 6:42 PM CDT for Bureau County, Illinois. It was in force for 63 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 7, 2011, 6:42 PM CDT (23:42 UTC)
Expired: Aug 7, 2011, 7:45 PM CDT
In force: 63 min
Issued by: NWS Quad Cities, IA

County Bureau County, IL

The radar

The Quad Cities radar (KDVN), 79 km from the middle of the area, began a volume at 23:42 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, 11.7 hours before the alert went out and 73 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: 61 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 7, 3:19 PM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Aug 7, 3:19 PM CDT, 3 hours 23 minutes before

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Hazardous weather outlook, Aug 7, 4:19 AM CDT, 14 hours 23 minutes before

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In the hours before

Special weather statement, Aug 7, 6:42 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 6, 11:45 PM CDT	Special Weather Statement	DVN	Jefferson, Keokuk, Van Buren, Washington	75 min
Aug 7, 12:20 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Iowa, Jefferson, Johnson, Keokuk, Lee and 2 more	55 min
Aug 7, 1:14 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Johnson, Lee, Louisa, Muscatine and 1 more	61 min
Aug 7, 1:55 AM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Louisa, Muscatine, Scott	50 min
Aug 7, 3:06 AM CDT	Special Weather Statement	DVN	Bureau, Henry, Putnam, Whiteside	54 min

Nearby

Special Weather Statements in Illinois, 2011 Every special weather statement in 2011

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.