Alert archive / Illinois / Snow Advisories in 2007
Snow Advisory 9, NWS Chicago, IL
NWS Chicago, IL issued this snow advisory at Dec 14, 2007, 3:50 PM CST for 14 counties in Illinois; Lake County, Porter County, Indiana. It took effect at Dec 15, 2007, 3:55 AM CST. It was in force for 24 hr.
The area
The counties it named.
The facts
- Issued
- Dec 14, 2007, 3:50 PM CST (21:50 UTC)
- In effect from
- Dec 15, 2007, 3:55 AM CST
- Expired
- Dec 16, 2007, 3:37 AM CST
- In force
- 24 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Grundy 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, Ogle County, IL, Winnebago County, IL, Lake County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 33 km from the middle of the area, began a volume at 21:55 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, 9.8 hours before the alert went out and 173 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1136 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -71 m²/s²
- 0-3 km storm-relative helicity
- -9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 14, 2:58 PM CST, 52 minutes earlier.
Area forecast discussion, Dec 14, 2:58 PM CST, 52 minutes before
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</html>Hazardous weather outlook, Dec 14, 6:00 AM CST, 9 hours 50 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 14, 3:50 PM CST | Heavy Snow Warning | LOT | DeKalb, DuPage, Ford, Grundy, Iroquois, Kane and 6 more | 44 hr |
Nearby
Snow Advisories in Illinois, 2007Snow Advisories in Indiana, 2007Every snow advisory in 2007
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.