Alert archive / Illinois / Frost Advisories in 2007
Frost Advisory 2, NWS Chicago, IL
NWS Chicago, IL issued this frost advisory at Sep 14, 2007, 2:20 PM CDT for 8 counties in Illinois. It took effect at Sep 15, 2007, 3:54 AM CDT. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Sep 14, 2007, 2:20 PM CDT (19:20 UTC)
- In effect from
- Sep 15, 2007, 3:54 AM CDT
- Expired
- Sep 15, 2007, 7:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, DeKalb County, IL, Kane County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 80 km from the middle of the area, began a volume at 19:24 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, 7.3 hours before the alert went out and 140 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
- 1700 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -126 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
Nearby
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.