Alert archive / Iowa / Winter Storm Watches in 2011
Winter Storm Watch 6, NWS Des Moines, IA
NWS Des Moines, IA issued this winter storm watch at Nov 7, 2011, 3:09 PM CST for 12 counties in Iowa. It took effect at Nov 8, 2011, 6:00 PM CST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Nov 7, 2011, 3:09 PM CST (21:09 UTC)
- In effect from
- Nov 8, 2011, 6:00 PM CST
- Expired
- Nov 8, 2011, 3:42 AM CST
- In force
- Issued by
- NWS Des Moines, IA
Counties Butler County, IA, Cerro Gordo County, IA, Franklin County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 126 km from the middle of the area, began a volume at 21:12 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 12:00Z, 9.2 hours before the alert went out and 222 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2253 m above ground
- 0-6 km bulk shear
- 86 kt
- 0-1 km storm-relative helicity
- -54 m²/s²
- 0-3 km storm-relative helicity
- -20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
Nearby
Winter Storm Watches in Iowa, 2011Every winter storm watch in 2011
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.