Alert archive / Illinois / Flash Flood Warnings in 1993

Flash Flood Warning 6, NWS Chicago, IL

June 30, 1993Lake County, McHenry County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 30, 1993, 6:29 AM CDT for Lake County, McHenry County, Illinois. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jun 30, 1993, 6:29 AM CDT (11:29 UTC)
Expired
Jun 30, 1993, 10:30 AM CDT
In force
4 hr
Issued by
NWS Chicago, IL
Area
Whole counties

Counties Lake County, IL, McHenry County, IL

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 11.5 hours before the alert went out and 238 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, Green Bay/Straub, WI at 00:00Z on 1993-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Green Bay/Straub, WI at 00:00Z on 1993-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1074 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
102 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
Jun 30, 2:09 AM CDTSevere Thunderstorm WarningLOTFord, Livingston51 min
Jun 30, 2:42 AM CDTSevere Thunderstorm WarningLOTIroquois63 min

Nearby

Flash Flood Warnings in Illinois, 1993Every flash flood warning in 1993

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.