Alert archive / Illinois / Frost Advisories in 2011

Frost Advisory 10, NWS Chicago, IL

October 29, 20119 counties in Illinois; 5 counties in Indiana

NWS Chicago, IL issued this frost advisory at Oct 29, 2011, 3:19 PM CDT for 9 counties in Illinois; 5 counties in Indiana. It took effect at Oct 30, 2011, 1:00 AM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Oct 29, 2011, 3:19 PM CDT (20:19 UTC)
In effect from: Oct 30, 2011, 1:00 AM CDT
Expired: Oct 30, 2011, 8:00 AM CDT
In force: 7 hr
Issued by: NWS Chicago, IL

Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall 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), 18 km from the middle of the area, began a volume at 20:25 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, 8.3 hours before the alert went out and 157 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: 2270 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 85 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 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 29, 3:08 PM CDT, 11 minutes earlier.

Area forecast discussion, Oct 29, 3:08 PM CDT, 11 minutes before

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Hazardous weather outlook, Oct 29, 4:32 AM CDT, 10 hours 47 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 29, 3:44 AM CDT	Gale Warning	LOT		41 hr
Oct 29, 3:13 PM CDT	Small Craft Advisory	LOT		36 hr

Nearby

Frost Advisories in Illinois, 2011 Frost Advisories in Indiana, 2011 Every 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; radar from the NEXRAD Level II archive.