Alert archive / Illinois / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 30, NWS Chicago, IL

May 26, 20084 counties in Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 26, 2008, 1:37 AM CDT for 4 counties in Illinois. It was in force for 38 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 26, 2008, 1:37 AM CDT (06:37 UTC)
Expired
May 26, 2008, 2:15 AM CDT
In force
38 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 25, 11:55 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 6.6 hours before the alert went out and 176 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, Lincoln, IL at 00:00Z on 2008-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 955 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, Lincoln, IL at 00:00Z on 2008-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 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
955 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 25, 11:02 PM CDTAreal Flood AdvisoryLOTOgle, Winnebago14 days
May 25, 11:40 PM CDTAreal Flood AdvisoryLOTBoone, Lake, McHenry, Winnebago14 days
May 25, 11:42 PM CDTSpecial Marine WarningLOT77 min
May 26, 1:01 AM CDTAreal Flood AdvisoryLOTBoone, DeKalb, Lake, Lee, McHenry14 days
May 26, 1:16 AM CDTSevere Thunderstorm WarningLOTDeKalb, LaSalle, Lee59 min
May 26, 2:01 AM CDTAreal Flood AdvisoryLOTCook, DeKalb, DuPage, Kane, Kendall, LaSalle and 2 more18 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2008Every severe thunderstorm warning in 2008

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.