Alert archive / Illinois / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 145, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Nov 11, 2015, 7:56 PM CST for LaSalle County, Livingston County, Illinois. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 11, 2015, 7:56 PM CST (01:56 UTC)
- Expired
- Nov 11, 2015, 8:30 PM CST
- In force
- 34 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties LaSalle County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 76 km from the middle of the area, began a volume at 01:59 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Nov 11, 6:16 PM CST | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.9 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 679 m above ground
- 0-6 km bulk shear
- 85 kt
- 0-1 km storm-relative helicity
- 358 m²/s²
- 0-3 km storm-relative helicity
- 394 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Nov 11, 6:06 PM CST, 1 hour 50 minutes earlier.
Area forecast discussion, Nov 11, 6:06 PM CST, 1 hour 50 minutes before
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</html>Hazardous weather outlook, Nov 11, 4:28 PM CST, 3 hours 28 minutes before
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Special weather statement, Nov 11, 6:43 PM CST, 1 hour 13 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 |
|---|---|---|---|---|
| Nov 11, 6:43 PM CST | Special Weather Statement | LOT | Boone | 32 min |
| Nov 11, 7:00 PM CST | Special Weather Statement | LOT | Boone, DeKalb, Grundy, Kane, Kendall, LaSalle and 1 more | 60 min |
| Nov 11, 7:05 PM CST | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 55 min |
| Nov 11, 7:16 PM CST | Special Weather Statement | LOT | Cook, DuPage, Lake, Will | 29 min |
| Nov 11, 7:29 PM CST | Special Marine Warning | LOT | 61 min | |
| Nov 11, 7:31 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee, Ogle | 59 min |
| Nov 11, 8:15 PM CST | Special Weather Statement | LOT | DuPage, Grundy, Kane, Kendall, McHenry | 45 min |
| Nov 11, 8:30 PM CST | Severe Thunderstorm Warning | LOT | DeKalb, Grundy, Kane, Kendall, LaSalle, Livingston | 45 min |
| Nov 11, 8:53 PM CST | Special Marine Warning | LOT | 97 min | |
| Nov 11, 9:03 PM CST | Special Weather Statement | LOT | Cook, DuPage, Kankakee, Lake, Will | 72 min |
| Nov 11, 9:33 PM CST | Gale Warning | LOT | 41 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 2015Every severe thunderstorm warning in 2015
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.