Alert archive / Iowa / Winter Storm Warnings in 2009

Winter Storm Warning 8, NWS Des Moines, IA

December 23, 200942 counties in Iowa

NWS Des Moines, IA issued this winter storm warning at Dec 23, 2009, 5:07 AM CST for 42 counties in Iowa. It took effect at Dec 23, 2009, 3:00 PM CST. It was in force for 61 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 23, 2009, 5:07 AM CST (11:07 UTC)
In effect from: Dec 23, 2009, 3:00 PM CST
Expired: Dec 26, 2009, 3:54 AM CST
In force: 61 hr
Issued by: NWS Des Moines, IA

All 42 counties

Adair County, IA, Adams 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, 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, Madison County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 47 km from the middle of the area, began a volume at 11:11 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, 11.1 hours before the alert went out and 304 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 107 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 winter storm warning 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 winter storm warning went out at Dec 22, 11:37 PM CST, 5 hours 30 minutes earlier.

Area forecast discussion, Dec 22, 11:37 PM CST, 5 hours 30 minutes before

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Hazardous weather outlook, Dec 22, 4:23 PM CST, 12 hours 44 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
Dec 23, 5:07 AM CST	Winter Weather Advisory	DMX	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 37 more	23 hr
Dec 23, 1:26 PM CST	River Flood Warning	DMX	Lucas, Wayne	30 hr
Dec 23, 3:58 PM CST	Flood Watch	DMX	Appanoose, Black Hawk, Clarke, Davis, Decatur, Jasper and 11 more	12 hr

Nearby

Winter Storm Warnings in Iowa, 2009 Every winter storm warning 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.