Alert archive / Illinois / Frost Advisories in 2011
Frost Advisory 8, NWS Chicago, IL
NWS Chicago, IL issued this frost advisory at Oct 21, 2011, 2:01 PM CDT for 10 counties in Illinois; 5 counties in Indiana. It took effect at Oct 22, 2011, 1:00 AM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Oct 21, 2011, 2:01 PM CDT (19:01 UTC)
- In effect from
- Oct 22, 2011, 1:00 AM CDT
- Expired
- Oct 22, 2011, 8:00 AM CDT
- In force
- 7 hr
- Issued by
- NWS Chicago, IL
Counties DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, Livingston County, IL, McHenry County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.0 hours before the alert went out and 348 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
- 714 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 79 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 20, 5:00 PM CDT, 21 hours 1 minute earlier.
Area forecast discussion, Oct 20, 5:00 PM CDT, 21 hours 1 minute before
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</html>Hazardous weather outlook, Oct 20, 3:34 PM CDT, 22 hours 27 minutes before
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Frost Advisories in Illinois, 2011Frost Advisories in Indiana, 2011Every frost advisory in 2011
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.