Alert archive / Vermont / Special Weather Statements in 2021

Special Weather Statement, NWS Burlington, VT

January 20, 2021Addison County, Vermont

NWS Burlington, VT issued this special weather statement at Jan 20, 2021, 1:35 PM EST for Addison County, Vermont. It was in force for 40 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, 1:35 PM EST (18:35 UTC)
Expired
Jan 20, 2021, 2:15 PM EST
In force
40 min
Issued by
NWS Burlington, VT

County Addison County, VT

The radar

The Burlington radar (KCXX), 31 km from the middle of the area, began a volume at 18:37 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

Albany, NY (KALY), launched 12:00Z, 6.6 hours before the alert went out and 180 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, Albany, NY 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.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, Albany, NY at 12:00Z on 2021-01-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
782 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

009 
WWUS81 KBTV 201835
SPSBTV

Special Weather Statement
National Weather Service Burlington VT
135 PM EST Wed Jan 20 2021

NYZ034-035-VTZ005-009-017-018-201915-
Western Essex-Eastern Essex-Eastern Chittenden-Western
Chittenden-Western Addison-Eastern Addison-
135 PM EST Wed Jan 20 2021

...AN AREA OF HEAVY SNOW WILL AFFECT EAST CENTRAL ESSEX...
NORTHWESTERN ADDISON AND SOUTHERN CHITTENDEN COUNTIES...

At 135 PM EST...an area of heavy snow was over Essex...moving
southeast at 10 mph.

Locations impacted include...
Vergennes, South Burlington, Essex, Willsboro, Westport, Monkton
Ridge, Monkton, Monkton Boro, Addison, Hinesburg, St. George,
Shelburne, Ferrisburg, Charlotte, Waltham, Panton, Mt. Philo State
Park, Kingsland Bay State Park, Ferrisburgh and Richmond.

  * visibilities will drop quickly to less than a mile in this area 
  of heavy snow.

  * sudden and brief snowfall rates of 1 to 2 inches per hour are 
  possible in this area of heavy snow.

LAT...LON 4426 7359 4446 7331 4437 7290 4400 7336
TIME...MOT...LOC 1835Z 317DEG 8KT 4428 7337 
$$

Clay

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 20, 8:21 AM ESTSpecial Weather StatementBTVFranklin, Grand Isle39 min
Jan 20, 8:59 AM ESTSpecial Weather StatementBTVChittenden, Franklin, Grand Isle, Lamoille46 min
Jan 20, 9:57 AM ESTSpecial Weather StatementBTVChittenden, Lamoille, Washington63 min
Jan 20, 12:42 PM ESTSpecial Weather StatementBTVChittenden48 min

Nearby

Special Weather Statements in Vermont, 2021Every special weather statement 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.