Alert archive / Iowa / Winter Storm Watches in 2020
Winter Storm Watch 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this winter storm watch at Nov 9, 2020, 3:29 PM CST for Union County, South Dakota; 6 counties in Iowa; Cottonwood County, Jackson County, Nobles County, Minnesota. It took effect at Nov 10, 2020, 12:00 AM CST. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Nov 9, 2020, 3:29 PM CST (21:29 UTC)
- In effect from
- Nov 10, 2020, 12:00 AM CST
- Expired
- Nov 10, 2020, 3:39 AM CST
- In force
- 4 hr
- Issued by
- NWS Sioux Falls, SD
Counties Dickinson County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Nobles County, MN, Union County, SD
The radar
The Sioux Falls radar (KFSD), 82 km from the middle of the area, began a volume at 21:31 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 243 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
- 74 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 171 m²/s²
- 0-3 km storm-relative helicity
- 277 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 Sioux Falls, SD wrote its last area forecast discussion before this winter storm watch went out at Nov 9, 11:26 AM CST, 4 hours 3 minutes earlier.
Area forecast discussion, Nov 9, 11:26 AM CST, 4 hours 3 minutes before
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</html>Hazardous weather outlook, Nov 9, 3:35 AM CST, 11 hours 54 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 |
|---|---|---|---|---|
| Nov 9, 3:29 PM CST | Winter Weather Advisory | FSD | Bon Homme, Brookings, Clay, Hutchinson, Lake, Lincoln and 6 more | 30 hr |
Nearby
Winter Storm Watches in Iowa, 2020Winter Storm Watches in Minnesota, 2020Winter Storm Watches in South Dakota, 2020Every winter storm watch in 2020
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.