Alert archive / Iowa / Winter Weather Advisories in 2017
Winter Weather Advisory 13, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this winter weather advisory at Dec 29, 2017, 2:18 AM CST for 6 counties in South Dakota; 8 counties in Iowa; Nobles County, Pipestone County, Rock County, Minnesota. It took effect at Dec 29, 2017, 6:00 AM CST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Dec 29, 2017, 2:18 AM CST (08:18 UTC)
- In effect from
- Dec 29, 2017, 6:00 AM CST
- Expired
- Dec 29, 2017, 4:00 PM CST
- In force
- 10 hr
- Issued by
- NWS Sioux Falls, SD
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Sioux County, IA, Nobles County, MN, Pipestone County, MN, Rock County, MN, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 08:17 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
Aberdeen, SD (KABR), launched 00:00Z, 8.3 hours before the alert went out and 237 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
- 882 m above ground
- 0-6 km bulk shear
- 88 kt
- 0-1 km storm-relative helicity
- -43 m²/s²
- 0-3 km storm-relative helicity
- 76 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 weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sioux Falls, SD wrote its last area forecast discussion before this winter weather advisory went out at Dec 28, 10:45 PM CST, 3 hours 33 minutes earlier.
Area forecast discussion, Dec 28, 10:45 PM CST, 3 hours 33 minutes before
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</html>Hazardous weather outlook, Dec 28, 5:15 PM CST, 9 hours 3 minutes before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 29, 3:50 PM CST | Wind Chill Warning | FSD | Beadle, Brookings, Kingsbury, Lake, Miner, Moody | 20 hr |
| Dec 29, 3:50 PM CST | Wind Chill Advisory | FSD | Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more | 32 hr |
Nearby
Winter Weather Advisories in Iowa, 2017Winter Weather Advisories in South Dakota, 2017Winter Weather Advisories in Minnesota, 2017Every winter weather advisory 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.