Alert archive / Iowa / Flash Flood Watches in 2008

Flash Flood Watch 8, NWS Des Moines, IA

June 4, 200851 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Jun 4, 2008, 4:16 AM CDT for 51 counties in Iowa. It took effect at Jun 4, 2008, 12:00 PM CDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Jun 4, 2008, 4:16 AM CDT (09:16 UTC)
In effect from: Jun 4, 2008, 12:00 PM CDT
Expired: Jun 5, 2008, 7:40 AM CDT
In force: 20 hr
Issued by: NWS Des Moines, IA
Flood severity: None

All 51 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, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.3 hours before the alert went out and 270 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: 20 J/kg
Mixed-layer CIN: -401 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

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 Jun 4, 3:50 AM CDT, 26 minutes earlier.

Area forecast discussion, Jun 4, 3:50 AM CDT, 26 minutes before

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Hazardous weather outlook, Jun 3, 10:13 PM CDT, 6 hours 3 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
Jun 4, 9:19 AM CDT	River Flood Warning	DMX	Polk, Story	69 hr
Jun 4, 5:25 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	50 min
Jun 4, 6:16 PM CDT	Severe Thunderstorm Warning	DMX	Adams	33 min
Jun 4, 6:30 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Madison, Union	45 min
Jun 4, 6:38 PM CDT	Tornado Warning	DMX	Adams, Union	37 min
Jun 4, 6:53 PM CDT	Tornado Warning	DMX	Madison, Union	37 min
Jun 4, 6:56 PM CDT	Tornado Warning	DMX	Adams, Ringgold, Taylor, Union	34 min

Nearby

Flash Flood Watches in Iowa, 2008 Every flash 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.