Alert archive / Illinois / Areal Flood Warnings in 2011

Areal Flood Warning 9, NWS Lincoln, IL

April 29, 2011Lawrence County, Illinois

NWS Lincoln, IL issued this areal flood warning at Apr 29, 2011, 10:11 PM CDT for Lawrence County, Illinois. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 29, 2011, 10:11 PM CDT (03:11 UTC)
Expired: Apr 30, 2011, 10:00 AM CDT
In force: 12 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

County Lawrence County, IL

The radar

The Evansville,IN radar (KVWX), 51 km from the middle of the area, began a volume at 03:08 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

Nashville Metro, TN (KBNA), launched 00:00Z, 3.2 hours before the alert went out and 305 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: 2454 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this areal flood warning went out at Apr 29, 8:56 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Apr 29, 8:56 PM CDT, 1 hour 15 minutes before

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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 1:24 PM CDT	Wind Advisory	ILX	Champaign, Christian, Coles, DeWitt, Douglas, Edgar and 8 more	4 hr
Apr 30, 1:51 PM CDT	Areal Flood Warning	ILX	Lawrence	34 hr

Nearby

Areal Flood Warnings in Illinois, 2011 Every areal flood warning 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.