Alert archive / South Dakota / Winter Storm Warnings in 2017

Winter Storm Warning 4, NWS Rapid City, SD

February 22, 201712 counties in South Dakota; Campbell County, Weston County, Wyoming

NWS Rapid City, SD issued this winter storm warning at Feb 22, 2017, 2:34 PM MST for 12 counties in South Dakota; Campbell County, Weston County, Wyoming. It took effect at Feb 22, 2017, 11:00 PM MST. It was in force for 29 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 22, 2017, 2:34 PM MST (21:34 UTC)
In effect from: Feb 22, 2017, 11:00 PM MST
Expired: Feb 24, 2017, 3:30 AM MST
In force: 29 hr
Issued by: NWS Rapid City, SD

Counties Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD, Campbell County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 48 km from the middle of the area, began a volume at 21:37 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 12:00Z, 9.6 hours before the alert went out and 331 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: 2478 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: -215 m²/s²
0-3 km storm-relative helicity: -194 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Rapid City, SD wrote its last area forecast discussion before this winter storm warning went out at Feb 22, 9:39 AM MST, 4 hours 55 minutes earlier.

Area forecast discussion, Feb 22, 9:39 AM MST, 4 hours 55 minutes before

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Hazardous weather outlook, Feb 22, 5:21 AM MST, 9 hours 13 minutes before

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The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 21, 5:03 PM MST	Special Weather Statement	UNR	Butte	27 min
Feb 21, 7:50 PM MST	Special Weather Statement	UNR	Custer	25 min
Feb 22, 2:34 PM MST	Winter Weather Advisory	UNR	Haakon, Lawrence, Meade, Pennington	37 hr

Nearby

Winter Storm Warnings in South Dakota, 2017 Winter Storm Warnings in Wyoming, 2017 Every winter storm warning 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.