Alert archive / Illinois / Flash Flood Watches in 2009
Flash Flood Watch 6, NWS Lincoln, IL
NWS Lincoln, IL issued this flash flood watch at Aug 17, 2009, 3:03 AM CDT for 17 counties in Illinois. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2009, 3:03 AM CDT (08:03 UTC)
- Expired
- Aug 17, 2009, 3:03 PM CDT
- In force
- 12 hr
- Issued by
- NWS Lincoln, IL
- Flood severity
- None
Counties Cass County, IL, DeWitt County, IL, Fulton County, IL, Knox County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 43 km from the middle of the area, began a volume at 08:05 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
Lincoln, IL (KILX), launched 00:00Z, 8.1 hours before the alert went out and 102 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
- 85 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 1108 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Lincoln, IL wrote its last area forecast discussion before this flash flood watch went out at Aug 17, 2:42 AM CDT, 21 minutes earlier.
Area forecast discussion, Aug 17, 2:42 AM CDT, 21 minutes before
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</html>Hazardous weather outlook, Aug 16, 3:01 PM CDT, 12 hours 2 minutes before
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</html>The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 2:49 PM CDT | Special Weather Statement | ILX | Cass | 41 min |
| Aug 17, 3:23 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Logan, Mason, Menard, Morgan, Sangamon and 1 more | 52 min |
| Aug 17, 4:33 PM CDT | Areal Flood Advisory | ILX | Logan, Sangamon | 3 hr |
| Aug 17, 4:48 PM CDT | Areal Flood Advisory | ILX | DeWitt, Logan, McLean, Tazewell, Woodford | 3 hr |
| Aug 17, 5:18 PM CDT | Areal Flood Advisory | ILX | DeWitt, Macon | 3 hr |
| Aug 17, 6:41 PM CDT | Areal Flood Advisory | ILX | Vermilion | 4 hr |
Nearby
Flash Flood Watches in Illinois, 2009Every flash flood watch in 2009
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.