Alert archive / Iowa / Flood Watches in 2008

Flood Watch 1, NWS Des Moines, IA

April 17, 200833 counties in Iowa

NWS Des Moines, IA issued this flood watch at Apr 17, 2008, 3:35 AM CDT for 33 counties in Iowa. It took effect at Apr 17, 2008, 7:00 PM CDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Apr 17, 2008, 3:35 AM CDT (08:35 UTC)
In effect from: Apr 17, 2008, 7:00 PM CDT
Expired: Apr 18, 2008, 7:00 PM CDT
In force: 24 hr
Issued by: NWS Des Moines, IA
Flood severity: None

All 33 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Grundy County, IA, Guthrie County, IA, Hardin County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 33 km from the middle of the area, began a volume at 08:37 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

Topeka, KS (KTOP), launched 00:00Z, 8.6 hours before the alert went out and 334 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 6 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1738 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this 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 flood watch went out at Apr 17, 3:10 AM CDT, 25 minutes earlier.

Area forecast discussion, Apr 17, 3:10 AM CDT, 25 minutes before

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Hazardous weather outlook, Apr 16, 3:26 PM CDT, 12 hours 9 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 17, 2:37 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Warren	25 min

Nearby

Flood Watches in Iowa, 2008 Every flood watch in 2008

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.