Alert archive / South Dakota / Winter Storm Warnings in 2018

Winter Storm Warning 13, NWS Rapid City, SD

December 25, 20188 counties in South Dakota

NWS Rapid City, SD issued this winter storm warning at Dec 25, 2018, 2:03 PM MST for 8 counties in South Dakota. It took effect at Dec 26, 2018, 2:00 AM MST. It was in force for 27 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 25, 2018, 2:03 PM MST (21:03 UTC)
In effect from
Dec 26, 2018, 2:00 AM MST
Expired
Dec 27, 2018, 5:00 AM MST
In force
27 hr
Issued by
NWS Rapid City, SD

Counties Bennett County, SD, Haakon County, SD, Jackson County, SD, Mellette County, SD, Perkins County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 124 km from the middle of the area, began a volume at 21:01 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, 9.1 hours before the alert went out and 252 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2018-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2018-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
518 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
94 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 Dec 25, 10:41 AM MST, 3 hours 22 minutes earlier.

Area forecast discussion, Dec 25, 10:41 AM MST, 3 hours 22 minutes before
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Hazardous weather outlook, Dec 25, 3:01 AM MST, 11 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Rapid City SD
301 AM MST Tue Dec 25 2018

SDZ001-002-012-013-024>026-028-031-072-073-WYZ054-056-057-071-
261315-
Harding-Perkins-Butte-Northern Meade Co Plains-
Northern Black Hills-Northern Foot Hills-Rapid City-
Central Black Hills-Pennington Co Plains-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Northern Campbell-Western Crook-Wyoming Black Hills-
Northeastern Crook-
301 AM MST Tue Dec 25 2018

This Hazardous Weather Outlook is for portions of northwestern
South Dakota...southwestern South Dakota...the Black Hills of
South Dakota...northeast Wyoming...and the Black Hills of
Wyoming.

.DAY ONE...Today and Tonight

A winter weather advisory is in effect tonight through Wednesday.
Snow will develop across the area tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Snow will continue through Wednesday, with snowfall accumulation
of 2 to 5 inches. See the Winter Weather Message (WSWUNR) for
details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ014-032-043-044-046-047-049-261315-
Ziebach-Haakon-Jackson-Bennett-Mellette-Todd-Tripp-
301 AM MST Tue Dec 25 2018 /401 AM CST Tue Dec 25 2018/

This Hazardous Weather Outlook is for portions of western South
Dakota.

.DAY ONE...Today and Tonight

A Winter Storm Watch is in effect Wednesday through Thursday
night. Snow will develop across the area tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Snow will continue through Thursday night, with snowfall
accumulation of 6 or more inches. Northwest winds will create
areas of blowing snow. See the Winter Weather Message (WSWUNR)
for details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ027-029-030-041-042-074-WYZ055-058-261315-
Southern Foot Hills-Southern Black Hills-Custer Co Plains-
Fall River-Oglala Lakota-Hermosa Foot Hills-Southern Campbell-
Weston-
301 AM MST Tue Dec 25 2018

This Hazardous Weather Outlook is for portions of southwestern
South Dakota...the Black Hills of South Dakota...and northeast
Wyoming.

.DAY ONE...Today and Tonight

Snow will develop across the area tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The snow will continue through Wednesday, with accumulations 1 to
2 inches.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 25, 2:50 AM MSTWinter Weather AdvisoryUNRBennett, Butte, Custer, Haakon, Harding, Jackson and 8 more3 days

Nearby

Winter Storm Warnings in South Dakota, 2018Every winter storm 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.