Alert archive / Minnesota / Winter Storm Warnings in 2020

Winter Storm Warning 5, NWS Duluth, MN

October 21, 20205 counties in Minnesota; Douglas County, Wisconsin

NWS Duluth, MN issued this winter storm warning at Oct 21, 2020, 3:37 PM CDT for 5 counties in Minnesota; Douglas County, Wisconsin. It took effect at Oct 22, 2020, 4:00 AM CDT. It was in force for 18 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
Oct 21, 2020, 3:37 PM CDT (20:37 UTC)
In effect from
Oct 22, 2020, 4:00 AM CDT
Expired
Oct 22, 2020, 10:02 PM CDT
In force
18 hr
Issued by
NWS Duluth, MN

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Saint Louis County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 71 km from the middle of the area, began a volume at 20:38 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, 8.6 hours before the alert went out and 458 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 2020-10-21Temperature 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 2020-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -109 square meters per square second.1939587897117136Sfc1 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
1096 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
-109 m²/s²
0-3 km storm-relative helicity
-31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 21, 4:11 AM CDTSmall Craft AdvisoryDLH15 hr
Oct 21, 4:29 AM CDTWinter Storm WatchDLHAitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 3 more11 hr
Oct 21, 3:37 PM CDTWinter Weather AdvisoryDLHCass, Cook, Itasca, Lake, Pine, Saint Louis30 hr

Nearby

Winter Storm Warnings in Minnesota, 2020Winter Storm Warnings in Wisconsin, 2020Every winter storm warning in 2020

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.