Alert archive / Iowa / Winter Storm Watches in 2007

Winter Storm Watch 9, NWS Des Moines, IA

December 9, 200718 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Dec 9, 2007, 4:06 AM CST for 18 counties in Iowa. It took effect at Dec 10, 2007, 6:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 9, 2007, 4:06 AM CST (10:06 UTC)
In effect from: Dec 10, 2007, 6:00 PM CST
Expired: Dec 10, 2007, 4:19 AM CST
In force
Issued by: NWS Des Moines, IA

Counties Adair County, IA, Adams County, IA, Appanoose County, IA, Cass County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 78 km from the middle of the area, began a volume at 10:10 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

Topeka, KS (KTOP), launched 00:00Z, 10.1 hours before the alert went out and 284 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: 0 J/kg
Mixed-layer LCL: 507 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 327 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 Dec 9, 4:06 AM CST, 0 minutes earlier.

Area forecast discussion, Dec 9, 4:06 AM CST, 0 minutes before

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Hazardous weather outlook, Dec 8, 11:45 PM CST, 4 hours 21 minutes before

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In the hours before

Local storm report, Dec 8, 10:27 PM CST, 5 hours 39 minutes before

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Local storm report, Dec 9, 12:09 AM CST, 3 hours 57 minutes before

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Local storm report, Dec 9, 12:13 AM CST, 3 hours 53 minutes before

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Local storm report, Dec 9, 12:14 AM CST, 3 hours 52 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 9, 4:06 AM CST	Winter Weather Advisory	DMX	Appanoose, Clarke, Davis, Decatur, Lucas, Mahaska and 8 more	11 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.