Alert archive / Iowa / Winter Storm Watches in 2007

Winter Storm Watch 7, NWS Des Moines, IA

April 10, 200725 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Apr 10, 2007, 3:51 AM CDT for 25 counties in Iowa. It took effect at Apr 10, 2007, 11:09 AM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Apr 10, 2007, 3:51 AM CDT (08:51 UTC)
In effect from: Apr 10, 2007, 11:09 AM CDT
Expired: Apr 10, 2007, 3:56 PM CDT
In force: 5 hr
Issued by: NWS Des Moines, IA

All 25 counties

Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo 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, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas 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), 102 km from the middle of the area, began a volume at 08:50 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, 8.9 hours before the alert went out and 245 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: 2572 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 85 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 Apr 9, 3:15 PM CDT, 12 hours 36 minutes earlier.

Area forecast discussion, Apr 9, 3:15 PM CDT, 12 hours 36 minutes before

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Hazardous weather outlook, Apr 9, 3:36 PM CDT, 12 hours 15 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
Apr 10, 7:44 AM CDT	Snow Advisory	DMX	Emmet, Kossuth, Palo Alto	8 hr
Apr 10, 3:56 PM CDT	Snow and Blowing Snow Advisory	DMX	Audubon, Boone, Calhoun, Carroll, Crawford, Dallas and 7 more	23 hr
Apr 10, 3:56 PM CDT	Winter Storm Warning	DMX	Black Hawk, Bremer, Butler, Cerro Gordo, Emmet, Franklin and 14 more	23 hr

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.