Alert archive / West Virginia / Snow Squall Warnings in 2021

Snow Squall Warning 6, NWS Charleston, WV

January 20, 2021Nicholas County, West Virginia

NWS Charleston, WV issued this snow squall warning at Jan 20, 2021, 11:21 AM EST for Nicholas County, West Virginia. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jan 20, 2021, 11:21 AM EST (16:21 UTC)
Expired
Jan 20, 2021, 11:45 AM EST
In force
24 min
Issued by
NWS Charleston, WV
Area
Storm-based polygon

County Nicholas County, WV

The radar

The Charleston,WV radar (KRLX), 79 km from the middle of the area, began a volume at 16:24 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

Roanoke, VA (KRNK), launched 12:00Z, 4.4 hours before the alert went out and 165 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, Roanoke, VA at 12:00Z on 2021-01-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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, Roanoke, VA at 12:00Z on 2021-01-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.1939587897117Sfc1 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
1246 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

525 
WWUS51 KRLX 201621
SQWRLX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Charleston WV
1121 AM EST Wed Jan 20 2021

WVC067-201645-
/O.NEW.KRLX.SQ.W.0006.210120T1621Z-210120T1645Z/
Nicholas WV-
1121 AM EST Wed Jan 20 2021

The National Weather Service in Charleston West Virginia has issued a

* Snow Squall Warning for...
  Central Nicholas County in southeastern West Virginia...

* Until 1145 AM EST.

* At 1121 AM EST, a dangerous snow squall was located near
  Summersville, moving south at 20 mph.

  HAZARD...Snow.

  SOURCE...Radar indicated.

  IMPACT...Expect hazardous road conditions.

* This includes Route 19 between mile markers 34 and 49.
 
Locations impacted include...
Summersville, Craigsville, Calvin, Kesslers Cross Lanes, Canvas,
Muddlety, Nettie and Mount Nebo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

&&

LAT...LON 3823 8096 3839 8083 3832 8057 3811 8079
TIME...MOT...LOC 1621Z 355DEG 17KT 3823 8080 

$$

11

Nearby

Snow Squall Warnings in West Virginia, 2021Every snow squall warning 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.