Alert archive / Iowa / Flash Flood Watches in 2009
Flash Flood Watch 10, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at Aug 17, 2009, 2:55 AM CDT for 9 counties in Iowa. It took effect at Aug 17, 2009, 3:00 AM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2009, 2:55 AM CDT (07:55 UTC)
- In effect from
- Aug 17, 2009, 3:00 AM CDT
- Expired
- Aug 17, 2009, 11:33 AM CDT
- In force
- 9 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
Counties Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Monroe County, IA, Ringgold County, IA, Wapello County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 07:54 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, 7.9 hours before the alert went out and 243 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
- 895 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.8
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 Des Moines, IA wrote its last area forecast discussion before this flash flood watch went out at Aug 16, 11:31 PM CDT, 3 hours 24 minutes earlier.
Area forecast discussion, Aug 16, 11:31 PM CDT, 3 hours 24 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 4:56 AM CDT | Areal Flood Advisory | DMX | Appanoose | 5 hr |
| Aug 17, 2:30 PM CDT | River Flood Warning | DMX | Lucas, Wayne | 13 hr |
Nearby
Flash Flood Watches in Iowa, 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.