Alert archive / Iowa / Winter Storm Watches in 2017
Winter Storm Watch 4, NWS Des Moines, IA
NWS Des Moines, IA issued this winter storm watch at Mar 10, 2017, 3:31 PM CST for 18 counties in Iowa. It took effect at Mar 12, 2017, 4:00 PM CDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Mar 10, 2017, 3:31 PM CST (21:31 UTC)
- In effect from
- Mar 12, 2017, 4:00 PM CDT
- Expired
- Mar 12, 2017, 4:08 AM CDT
- In force
- Issued by
- NWS Des Moines, IA
Counties Black Hawk County, IA, Bremer County, IA, Butler 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, Tama County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 120 km from the middle of the area, began a volume at 21:29 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, 9.5 hours before the alert went out and 230 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
- 1690 m above ground
- 0-6 km bulk shear
- 116 kt
- 0-1 km storm-relative helicity
- -118 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Mar 9, 5:53 PM CST, 21 hours 38 minutes earlier.
Area forecast discussion, Mar 9, 5:53 PM CST, 21 hours 38 minutes before
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</html>Hazardous weather outlook, Mar 9, 4:07 PM CST, 23 hours 24 minutes before
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</html>Nearby
Winter Storm Watches in Iowa, 2017Every winter storm watch in 2017
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.