Alert archive / South Dakota / Blizzard Warnings in 2018

Blizzard Warning 3, NWS Rapid City, SD

December 26, 2018Mellette County, Todd County, Tripp County, South Dakota

NWS Rapid City, SD issued this blizzard warning at Dec 26, 2018, 3:32 PM CST for Mellette County, Todd County, Tripp County, South Dakota. It took effect at Dec 27, 2018, 6:00 AM CST. It was in force for 24 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: Dec 26, 2018, 3:32 PM CST (21:32 UTC)
In effect from: Dec 27, 2018, 6:00 AM CST
Expired: Dec 28, 2018, 6:00 AM CST
In force: 24 hr
Issued by: NWS Rapid City, SD

Counties Mellette County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 21:36 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

Aberdeen, SD (KABR), launched 12:00Z, 9.5 hours before the alert went out and 236 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: 498 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 351 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 blizzard 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 blizzard warning went out at Dec 26, 3:20 PM CST, 12 minutes earlier.

Area forecast discussion, Dec 26, 3:20 PM CST, 12 minutes before

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Hazardous weather outlook, Dec 26, 3:30 PM CST, 2 minutes before

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In the hours before

Local storm report, Dec 26, 12:00 PM CST, 3 hours 32 minutes before

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Local storm report, Dec 26, 12:02 PM CST, 3 hours 30 minutes before

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Local storm report, Dec 26, 12:03 PM CST, 3 hours 29 minutes before

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Local storm report, Dec 26, 12:06 PM CST, 3 hours 26 minutes before

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Local storm report, Dec 26, 12:13 PM CST, 3 hours 19 minutes before

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Local storm report, Dec 26, 12:16 PM CST, 3 hours 16 minutes before

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Nearby

Blizzard Warnings in South Dakota, 2018 Every blizzard warning 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.