Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 28, NWS Chicago, IL

August 10, 2010LaSalle County, Livingston County, Illinois

NWS Chicago, IL issued this flash flood warning at Aug 10, 2010, 1:51 AM CDT for LaSalle County, Livingston County, Illinois. It was in force for 8 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
Aug 10, 2010, 1:51 AM CDT (06:51 UTC)
Expired
Aug 10, 2010, 9:45 AM CDT
In force
8 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties LaSalle County, IL, Livingston County, IL

The radar

The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 06:52 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, 6.9 hours before the alert went out and 159 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2010-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1590 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2010-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1590 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
792 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 10:51 PM CDTRiver Flood AdvisoryLOTOgle12 hr
Aug 10, 1:08 AM CDTAreal Flood AdvisoryLOTFord, LaSalle, Livingston6 hr
Aug 10, 7:21 AM CDTAreal Flood AdvisoryLOTLaSalle, Livingston4 hr
Aug 10, 8:23 AM CDTMarine Dense Fog AdvisoryLOT5 hr
Aug 10, 2:12 PM CDTHeat AdvisoryLOTFord, Iroquois, Kankakee, Livingston3 days

Nearby

Flash Flood Warnings in Illinois, 2010Every flash flood warning 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.