Alert archive / Illinois / Snow Advisories in 2005

Snow Advisory 2, NWS Chicago, IL

December 7, 200514 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this snow advisory at Dec 7, 2005, 3:25 PM CST for 14 counties in Illinois; 5 counties in Indiana. It took effect at Dec 8, 2005, 4:00 AM CST. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Dec 7, 2005, 3:25 PM CST (21:25 UTC)
In effect from: Dec 8, 2005, 4:00 AM CST
Expired: Dec 9, 2005, 12:00 AM CST
In force: 20 hr
Issued by: NWS Chicago, IL

Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

The radar

The Chicago radar (KLOT), 17 km from the middle of the area, began a volume at 21:32 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

Lincoln, IL (KILX), launched 12:00Z, 9.4 hours before the alert went out and 150 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1007 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this snow advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this snow advisory went out at Dec 7, 3:00 PM CST, 25 minutes earlier.

Area forecast discussion, Dec 7, 3:00 PM CST, 25 minutes before

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Nearby

Snow Advisories in Illinois, 2005 Snow Advisories in Indiana, 2005 Every snow advisory in 2005

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.