Alert archive / Illinois / Flash Flood Watches in 2010

Flash Flood Watch 1, NWS Lincoln, IL

April 30, 20108 counties in Illinois

NWS Lincoln, IL issued this flash flood watch at Apr 30, 2010, 2:40 PM CDT for 8 counties in Illinois. It took effect at May 1, 2010, 6:00 PM CDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Apr 30, 2010, 2:40 PM CDT (19:40 UTC)
In effect from: May 1, 2010, 6:00 PM CDT
Expired: May 2, 2010, 3:39 AM CDT
In force: 10 hr
Issued by: NWS Lincoln, IL
Flood severity: None

Counties Clark County, IL, Clay County, IL, Crawford County, IL, Cumberland County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 87 km from the middle of the area, began a volume at 19:38 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, 7.7 hours before the alert went out and 357 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: 5 J/kg
Mixed-layer CIN: -330 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 351 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Apr 30, 12:29 PM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Apr 30, 12:29 PM CDT, 2 hours 11 minutes before

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Hazardous weather outlook, Apr 30, 11:42 AM CDT, 2 hours 58 minutes before

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In the hours before

Special weather statement, Apr 30, 1:46 PM CDT, 54 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, 4:34 PM CDT	Special Weather Statement	ILX	Schuyler	41 min
Apr 30, 4:58 PM CDT	Special Weather Statement	ILX	Knox	62 min
Apr 30, 5:02 PM CDT	Severe Thunderstorm Warning	ILX	Knox	43 min

Nearby

Flash Flood Watches in Illinois, 2010 Every flash flood watch in 2010

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.