Alert archive / Illinois / Flash Flood Warnings in 1987

Flash Flood Warning 4, NWS Chicago, IL

August 14, 1987Cook County, DuPage County, Illinois

NWS Chicago, IL issued this flash flood warning at Aug 14, 1987, 1:36 PM CDT for Cook County, DuPage County, Illinois. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Aug 14, 1987, 1:36 PM CDT (18:36 UTC)
Expired
Aug 14, 1987, 7:30 PM CDT
In force
6 hr
Issued by
NWS Chicago, IL
Area
Whole counties

Counties Cook County, IL, DuPage County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 12:00Z, 6.6 hours before the alert went out and 197 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, Peoria Regional, IL at 12:00Z on 1987-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1702 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, Peoria Regional, IL at 12:00Z on 1987-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
1702 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
709 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Aug 14, 5:45 AM CDTFlash Flood WarningLOTCook, DuPage2 hr
Aug 14, 7:25 AM CDTFlash Flood WarningLOTCook, DuPage3 hr
Aug 14, 9:26 AM CDTFlash Flood WarningLOTCook, DuPage5 hr

Nearby

Flash Flood Warnings in Illinois, 1987Every flash flood warning in 1987

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.