Alert archive / South Dakota / Winter Storm Watches in 2018

Winter Storm Watch 4, NWS Sioux Falls, SD

March 3, 201816 counties in South Dakota

NWS Sioux Falls, SD issued this winter storm watch at Mar 3, 2018, 4:20 AM CST for 16 counties in South Dakota. It took effect at Mar 5, 2018, 12:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Mar 3, 2018, 4:20 AM CST (10:20 UTC)
In effect from: Mar 5, 2018, 12:00 AM CST
Expired: Mar 4, 2018, 2:25 PM CST
In force
Issued by: NWS Sioux Falls, SD

Counties Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 110 km from the middle of the area, began a volume at 10:18 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 10.3 hours before the alert went out and 342 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: 2491 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 328 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 Mar 3, 4:14 AM CST, 6 minutes earlier.

Area forecast discussion, Mar 3, 4:14 AM CST, 6 minutes before

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Nearby

Winter Storm Watches in South Dakota, 2018 Every winter storm watch in 2018

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.