Alert archive / Idaho / Winter Weather Advisories in 2021

Winter Weather Advisory 5, NWS Pocatello, ID

January 21, 2021Bear Lake County, Caribou County, Franklin County, Idaho

NWS Pocatello, ID issued this winter weather advisory at Jan 21, 2021, 1:22 PM MST for Bear Lake County, Caribou County, Franklin County, Idaho. It took effect at Jan 22, 2021, 5:00 PM MST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued
Jan 21, 2021, 1:22 PM MST (20:22 UTC)
In effect from
Jan 22, 2021, 5:00 PM MST
Expired
Jan 23, 2021, 1:37 PM MST
In force
21 hr
Issued by
NWS Pocatello, ID

Counties Bear Lake County, ID, Caribou County, ID, Franklin County, ID

The radar

The Pocatello radar (KSFX), 119 km from the middle of the area, began a volume at 20:22 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.4 hours before the alert went out and 184 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, Salt Lake City I, UT at 12:00Z on 2021-01-21Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2021-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
1409 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Winter Weather Advisories in Idaho, 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; radar from the NEXRAD Level II archive.