Alert archive / South Dakota / Winter Storm Watches in 2017
Winter Storm Watch 4, NWS Aberdeen, SD
NWS Aberdeen, SD issued this winter storm watch at Apr 29, 2017, 3:37 PM CDT for 6 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Apr 30, 2017, 7:00 PM CDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 29, 2017, 3:37 PM CDT (20:37 UTC)
- In effect from
- Apr 30, 2017, 7:00 PM CDT
- Expired
- Apr 30, 2017, 3:34 AM CDT
- In force
- Issued by
- NWS Aberdeen, SD
Counties Big Stone County, MN, Traverse County, MN, Clark County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Roberts County, SD
The radar
The Aberdeen radar (KABR), 121 km from the middle of the area, began a volume at 20:43 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, 8.6 hours before the alert went out and 263 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
- 1696 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -257 m²/s²
- 0-3 km storm-relative helicity
- -257 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 Aberdeen, SD wrote its last area forecast discussion before this winter storm watch went out at Apr 29, 12:18 PM CDT, 3 hours 19 minutes earlier.
Area forecast discussion, Apr 29, 12:18 PM CDT, 3 hours 19 minutes before
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</html>Hazardous weather outlook, Apr 29, 4:55 AM CDT, 10 hours 42 minutes before
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</html>Nearby
Winter Storm Watches in South Dakota, 2017Winter Storm Watches in Minnesota, 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.