Alert archive / Illinois / Winter Storm Watches in 2012

Winter Storm Watch 2, NWS Chicago, IL

January 19, 20129 counties in Illinois

NWS Chicago, IL issued this winter storm watch at Jan 19, 2012, 3:23 AM CST for 9 counties in Illinois. It took effect at Jan 20, 2012, 6:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 19, 2012, 3:23 AM CST (09:23 UTC)
In effect from: Jan 20, 2012, 6:00 AM CST
Expired: Jan 19, 2012, 2:41 PM CST
In force
Issued by: NWS Chicago, IL

Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL

The radar

The Chicago radar (KLOT), 74 km from the middle of the area, began a volume at 09:21 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 00:00Z, 9.4 hours before the alert went out and 159 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: 1288 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 422 m²/s²
0-3 km storm-relative helicity: 461 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 winter storm watch 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 winter storm watch went out at Jan 19, 2:10 AM CST, 1 hour 13 minutes earlier.

Area forecast discussion, Jan 19, 2:10 AM CST, 1 hour 13 minutes before

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Hazardous weather outlook, Jan 18, 4:06 PM CST, 11 hours 17 minutes before

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In the hours before

Special weather statement, Jan 18, 9:57 PM CST, 5 hours 26 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
Jan 18, 9:19 PM CST	Heavy Freezing Spray Warning	LOT		17 hr
Jan 19, 9:49 AM CST	Small Craft Advisory	LOT		18 hr
Jan 19, 2:41 PM CST	Winter Weather Advisory	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kankakee and 7 more	31 hr

Nearby

Winter Storm Watches in Illinois, 2012 Every winter storm watch in 2012

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.