Alert archive / Illinois / Flash Flood Warnings in 1996

Flash Flood Warning 17, NWS Chicago, IL

July 18, 19965 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jul 18, 1996, 6:00 PM CDT for 5 counties in Illinois. It was in force for 6 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
Jul 18, 1996, 6:00 PM CDT (23:00 UTC)
Expired
Jul 19, 1996, 12:00 AM CDT
In force
6 hr
Issued by
NWS Chicago, IL
Area
Whole counties

Counties Cook County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 16 km from the middle of the area, began a volume at 23:03 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, 11.0 hours before the alert went out and 199 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 12:00Z on 1996-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1244 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 12:00Z on 1996-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 270 square meters per square second.193958Sfc1 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
1244 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
270 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
0.2
Supercell composite
6.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 9:07 PM CDTSevere Thunderstorm WarningLOTLee53 min
Jul 17, 11:10 PM CDTFlash Flood WarningLOTWinnebago3 hr
Jul 18, 1:42 AM CDTFlash Flood WarningLOTCook, DuPage, Kane, Kendall, Will2 hr
Jul 18, 4:02 AM CDTFlash Flood WarningLOTCook, Will3 hr
Jul 18, 4:02 AM CDTFlash Flood WarningLOTDeKalb, Kane, Kendall3 hr
Jul 18, 4:02 AM CDTFlash Flood WarningLOTDuPage3 hr
Jul 18, 9:42 AM CDTFlash Flood WarningLOTDeKalb, Ogle, Winnebago8 hr
Jul 18, 9:42 AM CDTFlash Flood WarningLOTCook, DuPage, Kane, Kendall, Will8 hr
Jul 18, 9:42 AM CDTFlash Flood WarningLOTLaPorte, Marshall, Saint Joseph, Starke8 hr
Jul 18, 9:42 AM CDTFlash Flood WarningLOTLake, Porter8 hr

Nearby

Flash Flood Warnings in Illinois, 1996Every flash flood warning in 1996

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.