Alert archive / Illinois / Flash Flood Warnings in 1998

Flash Flood Warning 5, NWS Chicago, IL

May 19, 1998DeKalb County, Kane County, Illinois

NWS Chicago, IL issued this flash flood warning at May 19, 1998, 4:41 PM CDT for DeKalb County, Kane County, Illinois. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 19, 1998, 4:41 PM CDT (21:41 UTC)
Expired
May 19, 1998, 5:41 PM CDT
In force
60 min
Issued by
NWS Chicago, IL
Area
Whole counties

Counties DeKalb County, IL, Kane County, IL

The radar

The Chicago radar (KLOT), 55 km from the middle of the area, began a volume at 21:44 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, 9.7 hours before the alert went out and 161 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 1998-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2752 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 1998-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -51 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
2752 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
917 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-51 m²/s²
0-3 km storm-relative helicity
-8 m²/s²
Significant tornado parameter
0.0
Supercell composite
-2.0

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
May 19, 3:38 PM CDTSevere Thunderstorm WarningLOTOgle30 min
May 19, 3:43 PM CDTSevere Thunderstorm WarningLOTIroquois32 min
May 19, 3:50 PM CDTSevere Thunderstorm WarningLOTDeKalb, Kane40 min
May 19, 4:16 PM CDTTornado WarningLOTDeKalb, Kane44 min
May 19, 4:18 PM CDTSevere Thunderstorm WarningLOTKankakee42 min
May 19, 6:44 PM CDTSevere Thunderstorm WarningLOTFord, Livingston46 min
May 19, 4:09 PM CDTSevere Thunderstorm WarningLOTNewton36 min
May 19, 4:21 PM CDTSevere Thunderstorm WarningLOTBenton39 min
May 19, 4:49 PM CDTTornado WarningLOTNewton31 min
May 19, 5:00 PM CDTSevere Thunderstorm WarningLOTJasper45 min

Nearby

Flash Flood Warnings in Illinois, 1998Every flash flood warning in 1998

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.