Alert archive / North Dakota / Winter Weather Advisories in 2021

Winter Weather Advisory 6, NWS Bismarck, ND

October 12, 20214 counties in North Dakota

NWS Bismarck, ND issued this winter weather advisory at Oct 12, 2021, 2:03 PM MDT for 4 counties in North Dakota. It took effect at Oct 12, 2021, 6:00 PM MDT. It was in force for 26 hr.

The area

The counties it named.

The facts

Issued
Oct 12, 2021, 2:03 PM MDT (20:03 UTC)
In effect from
Oct 12, 2021, 6:00 PM MDT
Expired
Oct 13, 2021, 8:23 PM MDT
In force
26 hr
Issued by
NWS Bismarck, ND

Counties Billings County, ND, Divide County, ND, McKenzie County, ND, Williams County, ND

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.1 hours before the alert went out and 437 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, Rapid City, SD at 12:00Z on 2021-10-12Temperature 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, Rapid City, SD at 12:00Z on 2021-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 314 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
1019 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
314 m²/s²
0-3 km storm-relative helicity
503 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 12, 3:01 AM MDTWinter Weather AdvisoryBISBowman, Golden Valley, Slope11 hr
Oct 12, 2:03 PM MDTWinter Storm WarningBISBowman, Golden Valley, Slope30 hr
Oct 12, 2:07 PM MDTWind AdvisoryBISAdams, Billings, Bowman, Burke, Burleigh, Divide and 13 more30 hr

Nearby

Winter Weather Advisories in North Dakota, 2021Every winter weather advisory in 2021

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.