Alert archive / Illinois / Special Weather Statements in 2011

Special Weather Statement, NWS Quad Cities, IA

April 19, 2011Carroll County, Stephenson County, Illinois

NWS Quad Cities, IA issued this special weather statement at Apr 19, 2011, 4:29 PM CDT for Carroll County, Stephenson County, Illinois. It was in force for 61 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: Apr 19, 2011, 4:29 PM CDT (21:29 UTC)
Expired: Apr 19, 2011, 5:30 PM CDT
In force: 61 min
Issued by: NWS Quad Cities, IA

Counties Carroll County, IL, Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 107 km from the middle of the area, began a volume at 21:33 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

Lincoln, IL (KILX), launched 12:00Z, 9.5 hours before the alert went out and 250 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: 453 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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 Apr 19, 3:26 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Apr 19, 3:26 PM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, Apr 19, 3:37 PM CDT, 52 minutes before

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In the hours before

Local storm report, Apr 19, 11:29 AM CDT, 5 hours before

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Local storm report, Apr 19, 11:49 AM CDT, 4 hours 40 minutes before

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Local storm report, Apr 19, 4:09 PM CDT, 20 minutes before

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Local storm report, Apr 19, 4:26 PM CDT, 3 minutes before

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Local storm report, Apr 19, 4:29 PM CDT, 0 minutes before

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Special weather statement, Apr 19, 4:29 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
Apr 19, 5:21 AM CDT	Special Weather Statement	DVN	Des Moines, Henry, Jefferson, Lee, Van Buren	114 min
Apr 19, 7:32 AM CDT	Special Weather Statement	DVN	Henry, Jefferson, Washington	58 min
Apr 19, 8:31 AM CDT	Special Weather Statement	DVN	Louisa	59 min
Apr 19, 10:14 AM CDT	Special Weather Statement	DVN	Delaware, Dubuque, Linn	61 min
Apr 19, 11:22 AM CDT	River Flood Warning	DVN	Hancock, McDonough	10 hr
Apr 19, 6:37 PM CDT	Special Weather Statement	DVN	Bureau, Putnam	53 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.