Alert archive / South Dakota / Winter Storm Watches in 2015

Winter Storm Watch 6, NWS Sioux Falls, SD

December 26, 201512 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota

NWS Sioux Falls, SD issued this winter storm watch at Dec 26, 2015, 2:51 PM CST for 12 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota. It took effect at Dec 28, 2015, 6:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 26, 2015, 2:51 PM CST (20:51 UTC)
In effect from: Dec 28, 2015, 6:00 AM CST
Expired: Dec 28, 2015, 3:39 AM CST
In force
Issued by: NWS Sioux Falls, SD

All 31 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Bon Homme County, SD, Brookings County, SD, Clay County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 42 km from the middle of the area, began a volume at 20:52 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, 8.9 hours before the alert went out and 266 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 538 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Dec 26, 11:44 AM CST, 3 hours 7 minutes earlier.

Area forecast discussion, Dec 26, 11:44 AM CST, 3 hours 7 minutes before

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Hazardous weather outlook, Dec 26, 3:25 AM CST, 11 hours 26 minutes before

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In the hours before

Local storm report, Dec 26, 11:08 AM CST, 3 hours 43 minutes before

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Local storm report, Dec 26, 11:15 AM CST, 3 hours 36 minutes before

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Local storm report, Dec 26, 11:21 AM CST, 3 hours 30 minutes before

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Local storm report, Dec 26, 11:36 AM CST, 3 hours 15 minutes before

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Local storm report, Dec 26, 11:38 AM CST, 3 hours 13 minutes before

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Local storm report, Dec 26, 12:40 PM CST, 2 hours 11 minutes before

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Nearby

Winter Storm Watches in South Dakota, 2015 Winter Storm Watches in Iowa, 2015 Winter Storm Watches in Minnesota, 2015 Every winter storm watch in 2015

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.