Alert archive / Illinois / Flash Flood Watches in 2009
Flash Flood Watch 8, NWS Lincoln, IL
NWS Lincoln, IL issued this flash flood watch at Aug 26, 2009, 3:06 PM CDT for Knox County, Marshall County, Stark County, Illinois. It took effect at Aug 26, 2009, 7:00 PM CDT. It was in force for 20 hr.
The area
The counties it named.
The facts
- Issued
- Aug 26, 2009, 3:06 PM CDT (20:06 UTC)
- In effect from
- Aug 26, 2009, 7:00 PM CDT
- Expired
- Aug 27, 2009, 3:11 PM CDT
- In force
- 20 hr
- Issued by
- NWS Lincoln, IL
- Flood severity
- None
Counties Knox County, IL, Marshall County, IL, Stark County, IL
The radar
The Quad Cities radar (KDVN), 94 km from the middle of the area, began a volume at 20:09 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 12:00Z, 8.1 hours before the alert went out and 90 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
- 483 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 490 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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.