Alert archive / Iowa / Flash Flood Watches in 2010

Flash Flood Watch 29, NWS Des Moines, IA

September 22, 20109 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Sep 22, 2010, 10:02 PM CDT for 9 counties in Iowa. It took effect at Sep 23, 2010, 4:00 AM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Sep 22, 2010, 10:02 PM CDT (03:02 UTC)
In effect from: Sep 23, 2010, 4:00 AM CDT
Expired: Sep 23, 2010, 3:37 PM CDT
In force: 12 hr
Issued by: NWS Des Moines, IA
Flood severity: None

Counties Cerro Gordo County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Worth County, IA

The radar

The Des Moines radar (KDMX), 157 km from the middle of the area, began a volume at 03:05 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

Minneapolis, MN (KMPX), launched 00:00Z, 3.0 hours before the alert went out and 196 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 523 m²/s²
0-3 km storm-relative helicity: 621 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 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 Sep 22, 6:49 PM CDT, 3 hours 13 minutes earlier.

Area forecast discussion, Sep 22, 6:49 PM CDT, 3 hours 13 minutes before

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Hazardous weather outlook, Sep 22, 3:53 PM CDT, 6 hours 9 minutes before

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In the hours before

Special weather statement, Sep 22, 5:56 PM CDT, 4 hours 6 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
Sep 23, 9:20 AM CDT	River Flood Warning	DMX	Emmet	27 days
Sep 23, 9:20 AM CDT	River Flood Warning	DMX	Palo Alto	18 days
Sep 23, 9:20 AM CDT	River Flood Warning	DMX	Humboldt	23 days
Sep 23, 10:24 AM CDT	River Flood Warning	DMX	Wapello	9 hr

Nearby

Flash Flood Watches in Iowa, 2010 Every flash flood watch in 2010

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.