Alert archive / Iowa / Flood Watches in 2008

Flood Watch 2, NWS Des Moines, IA

May 10, 200826 counties in Iowa

NWS Des Moines, IA issued this flood watch at May 10, 2008, 4:08 AM CDT for 26 counties in Iowa. It took effect at May 10, 2008, 7:00 PM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: May 10, 2008, 4:08 AM CDT (09:08 UTC)
In effect from: May 10, 2008, 7:00 PM CDT
Expired: May 10, 2008, 3:47 PM CDT
In force
Issued by: NWS Des Moines, IA
Flood severity: None

All 26 counties

Adair County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Jasper County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Story County, IA, Tama County, IA, Warren County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 19 km from the middle of the area, began a volume at 09:09 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

Omaha, NE (KOAX), launched 00:00Z, 9.1 hours before the alert went out and 223 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: 16 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1099 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 69 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 May 10, 3:38 AM CDT, 30 minutes earlier.

Area forecast discussion, May 10, 3:38 AM CDT, 30 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
May 10, 4:22 AM CDT	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 32 more	32 hr
May 10, 3:47 PM CDT	Flash Flood Watch	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 32 more	12 hr

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.