Alert archive / Iowa / Winter Storm Watches in 2007

Winter Storm Watch 4, NWS Des Moines, IA

February 22, 200722 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Feb 22, 2007, 3:58 AM CST for 22 counties in Iowa. It took effect at Feb 22, 2007, 3:51 PM CST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Feb 22, 2007, 3:58 AM CST (09:58 UTC)
In effect from: Feb 22, 2007, 3:51 PM CST
Expired: Feb 23, 2007, 3:44 AM CST
In force: 12 hr
Issued by: NWS Des Moines, IA

All 22 counties

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

The radar

The Des Moines radar (KDMX), 111 km from the middle of the area, began a volume at 10:02 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, 10.0 hours before the alert went out and 236 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: 886 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: 78 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 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 winter storm watch went out at Feb 22, 3:45 AM CST, 13 minutes earlier.

Area forecast discussion, Feb 22, 3:45 AM CST, 13 minutes before

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Nearby

Winter Storm Watches in Iowa, 2007 Every winter storm watch in 2007

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.