Alert archive / Illinois / Winter Storm Watches in 2021
Winter Storm Watch 3, NWS Chicago, IL
NWS Chicago, IL issued this winter storm watch at Feb 3, 2021, 3:03 AM CST for 4 counties in Illinois. It took effect at Feb 4, 2021, 3:00 PM CST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 3, 2021, 3:03 AM CST (09:03 UTC)
- In effect from
- Feb 4, 2021, 3:00 PM CST
- Expired
- Feb 3, 2021, 2:29 PM CST
- In force
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, Lee County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 105 km from the middle of the area, began a volume at 09:08 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, 9.1 hours before the alert went out and 124 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
- 1014 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 65 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 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 Feb 2, 10:45 PM CST, 4 hours 18 minutes earlier.
Area forecast discussion, Feb 2, 10:45 PM CST, 4 hours 18 minutes before
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</html>Hazardous weather outlook, Feb 2, 2:42 PM CST, 12 hours 21 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 3, 5:47 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, Grundy, Kankakee, LaSalle, Lee and 4 more | 5 hr |
| Feb 3, 6:27 AM CST | Gale Watch | LOT | 9 hr | |
| Feb 3, 6:27 AM CST | Small Craft Advisory | LOT | 36 hr | |
| Feb 3, 2:29 PM CST | Winter Storm Warning | LOT | Boone, Lee, Ogle, Winnebago | 36 hr |
| Feb 3, 2:29 PM CST | Winter Weather Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 10 more | 46 hr |
| Feb 3, 3:04 PM CST | Gale Warning | LOT | 51 hr |
Nearby
Winter Storm Watches in Illinois, 2021Every winter storm watch in 2021
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.