Alert archive / Illinois / Flash Flood Watches in 2016
Flash Flood Watch 3, NWS Chicago, IL
NWS Chicago, IL issued this flash flood watch at Aug 11, 2016, 8:06 PM CDT for 15 counties in Illinois; Lake County, Indiana. It took effect at Aug 11, 2016, 10:00 PM CDT. It was in force for 26 hr.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2016, 8:06 PM CDT (01:06 UTC)
- In effect from
- Aug 11, 2016, 10:00 PM CDT
- Expired
- Aug 13, 2016, 12:00 AM CDT
- In force
- 26 hr
- Issued by
- NWS Chicago, IL
- Flood severity
- None
Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Lake County, IN
The radar
The Chicago radar (KLOT), 36 km from the middle of the area, began a volume at 01:07 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, 1.1 hours before the alert went out and 167 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
- 1433 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 1263 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.6
What forecasters said that day
The local office's own words before this flash flood 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 flash flood watch went out at Aug 11, 7:02 PM CDT, 1 hour 4 minutes earlier.
Area forecast discussion, Aug 11, 7:02 PM CDT, 1 hour 4 minutes before
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</html>Hazardous weather outlook, Aug 11, 3:46 PM CDT, 4 hours 20 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 |
|---|---|---|---|---|
| Aug 12, 11:13 AM CDT | Special Weather Statement | LOT | Cook | 62 min |
| Aug 12, 11:17 AM CDT | Special Marine Warning | LOT | 43 min | |
| Aug 12, 11:55 AM CDT | Special Marine Warning | LOT | 35 min | |
| Aug 12, 12:14 PM CDT | River Flood Advisory | LOT | Will | 36 hr |
| Aug 12, 5:18 PM CDT | Flash Flood Warning | LOT | Grundy, LaSalle, Livingston | 6 hr |
| Aug 12, 5:51 PM CDT | Flash Flood Warning | LOT | Cook, Grundy, Kendall, Will | 6 hr |
| Aug 12, 6:43 PM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kane, Kendall | 3 hr |
Nearby
Flash Flood Watches in Illinois, 2016Flash Flood Watches in Indiana, 2016Every flash flood watch in 2016
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.