Alert archive / Iowa / Snow Advisories in 2008

Snow Advisory 4, NWS Des Moines, IA

February 11, 200829 counties in Iowa

NWS Des Moines, IA issued this snow advisory at Feb 11, 2008, 3:37 AM CST for 29 counties in Iowa. It took effect at Feb 11, 2008, 12:00 PM CST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Feb 11, 2008, 3:37 AM CST (09:37 UTC)
In effect from: Feb 11, 2008, 12:00 PM CST
Expired: Feb 12, 2008, 6:00 AM CST
In force: 18 hr
Issued by: NWS Des Moines, IA

All 29 counties

Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Crawford County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Poweshiek County, IA, Sac County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 09:43 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, 9.6 hours before the alert went out and 257 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: 1283 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 53 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 snow advisory 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 snow advisory went out at Feb 10, 3:44 PM CST, 11 hours 53 minutes earlier.

Area forecast discussion, Feb 10, 3:44 PM CST, 11 hours 53 minutes before

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Hazardous weather outlook, Feb 10, 3:39 PM CST, 11 hours 58 minutes before

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Nearby

Snow Advisories in Iowa, 2008 Every snow advisory 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.