Alert archive / Illinois / Winter Storm Warnings in 2011
Winter Storm Warning 1, NWS Chicago, IL
NWS Chicago, IL issued this winter storm warning at Feb 19, 2011, 3:51 PM CST for 4 counties in Illinois. It took effect at Feb 20, 2011, 3:00 AM CST. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 19, 2011, 3:51 PM CST (21:51 UTC)
- In effect from
- Feb 20, 2011, 3:00 AM CST
- Expired
- Feb 20, 2011, 10:00 AM CST
- In force
- 7 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, Lake County, IL, McHenry County, IL, Winnebago County, IL
The radar
The Milwaukee radar (KMKX), 71 km from the middle of the area, began a volume at 21:57 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.9 hours before the alert went out and 242 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
- 1172 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- -260 m²/s²
- 0-3 km storm-relative helicity
- -197 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm warning 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 warning went out at Feb 19, 3:29 PM CST, 22 minutes earlier.
Area forecast discussion, Feb 19, 3:29 PM CST, 22 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 19, 4:44 AM CST | Winter Storm Watch | LOT | Boone, Lake, McHenry, Winnebago | 11 hr |
| Feb 19, 9:46 AM CST | Gale Watch | LOT | 17 hr | |
| Feb 19, 2:39 PM CST | Small Craft Advisory | LOT | 3 days | |
| Feb 19, 3:51 PM CST | Winter Weather Advisory | LOT | DeKalb, DuPage, Kane, Ogle | 18 hr |
| Feb 19, 10:33 AM CST | River Flood Advisory | LOT | Newton | 24 hr |
Nearby
Winter Storm Warnings in Illinois, 2011Every winter storm warning 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.