Alert archive / South Dakota / Winter Storm Watches in 2007

Winter Storm Watch 5, NWS Sioux Falls, SD

February 28, 200718 counties in South Dakota; Plymouth County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this winter storm watch at Feb 28, 2007, 10:43 AM CST for 18 counties in South Dakota; Plymouth County, Woodbury County, Iowa. It took effect at Mar 1, 2007, 12:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 28, 2007, 10:43 AM CST (16:43 UTC)
In effect from: Mar 1, 2007, 12:00 PM CST
Expired: Feb 28, 2007, 4:32 PM CST
In force
Issued by: NWS Sioux Falls, SD

Counties Plymouth County, IA, Woodbury County, IA, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Clay County, SD, Davison County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn 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 16:45 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

Omaha, NE (KOAX), launched 12:00Z, 4.7 hours before the alert went out and 257 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: 1074 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 102 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 Feb 28, 5:28 AM CST, 5 hours 15 minutes earlier.

Area forecast discussion, Feb 28, 5:28 AM CST, 5 hours 15 minutes before

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Hazardous weather outlook, Feb 28, 6:03 AM CST, 4 hours 40 minutes before

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In the hours before

Local storm report, Feb 28, 7:44 AM CST, 2 hours 59 minutes before

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Local storm report, Feb 28, 9:37 AM CST, 1 hour 6 minutes before

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Local storm report, Feb 28, 10:15 AM CST, 28 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 4:32 PM CST	Blizzard Watch	FSD	Aurora, Beadle, Bon Homme, Brule, Charles Mix, Clay and 13 more	12 hr
Feb 28, 4:32 PM CST	Blizzard Warning	FSD	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	61 hr
Feb 28, 4:14 AM CST	Blizzard Watch	FSD	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 3 more	12 hr

Nearby

Winter Storm Watches in South Dakota, 2007 Winter Storm Watches in Iowa, 2007 Every winter storm watch in 2007

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.