Alert archive / Illinois / Frost Advisories in 2007
Frost Advisory 4, NWS Chicago, IL
NWS Chicago, IL issued this frost advisory at Oct 22, 2007, 3:20 PM CDT for 5 counties in Illinois. It took effect at Oct 23, 2007, 5:00 AM CDT. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Oct 22, 2007, 3:20 PM CDT (20:20 UTC)
- In effect from
- Oct 23, 2007, 5:00 AM CDT
- Expired
- Oct 23, 2007, 8:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, DeKalb County, IL, Lee County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 97 km from the middle of the area, began a volume at 20:21 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, 8.3 hours before the alert went out and 128 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
- 599 m above ground
- 0-6 km bulk shear
- 86 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost 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 frost advisory went out at Oct 21, 6:08 PM CDT, 21 hours 12 minutes earlier.
Area forecast discussion, Oct 21, 6:08 PM CDT, 21 hours 12 minutes before
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</html>Hazardous weather outlook, Oct 21, 3:27 PM CDT, 23 hours 53 minutes before
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Frost Advisories in Illinois, 2007Every frost 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.