Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Burlington, VT

December 4, 2021St. Lawrence County, New York

NWS Burlington, VT issued this special weather statement at Dec 4, 2021, 2:21 PM EST for St. Lawrence County, New York. It was in force for 39 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: Dec 4, 2021, 2:21 PM EST (19:21 UTC)
Expired: Dec 4, 2021, 3:00 PM EST
In force: 39 min
Issued by: NWS Burlington, VT

County St. Lawrence County, NY

The radar

The Burlington radar (KCXX), 125 km from the middle of the area, began a volume at 19:22 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

Albany, NY (KALY), launched 12:00Z, 7.4 hours before the alert went out and 231 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 978 m above ground
0-6 km bulk shear: 110 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

192 
WWUS81 KBTV 041921
SPSBTV

Special Weather Statement
National Weather Service Burlington VT
221 PM EST Sat Dec 4 2021

NYZ026-027-029>031-087-042000-
Northern St. Lawrence-Northern Franklin-Southeastern St.
Lawrence-Southern Franklin-Western Clinton-Southwestern St. Lawrence-
221 PM EST Sat Dec 4 2021

...AN AREA OF SNOW SHOWERS WILL AFFECT NORTHWESTERN CLINTON...
NORTHWESTERN FRANKLIN AND ST. LAWRENCE COUNTIES...

At 220 PM EST...an area of snow showers was along a line extending
from near Massena International Airport - Richards Field to Canton to
near Fowler...and moving east at 35 mph.

Locations impacted include...
Potsdam, Massena, Gouverneur, Canton, Norfolk, Oswegatchie, Moira, De
Kalb, Bangor, Fowler, Parishville, Fort Covington, Colton, Bombay,
Morley, Degrasse, Massena International Airport - Richards Field,
Helena, Burke and Carry Falls Reservoir.

  * winds in excess of 25 mph are possible with these snow showers.

  * visibilities will drop quickly to less than a half mile in these 
  snow showers. Several observation sites have reported visibilities 
  below 1 mile.

Conditions can deteriorate rapidly in winter weather situations. Be
prepared for snow or ice covered roads. Slow down and allow extra
time when traveling.

LAT...LON 4500 7393 4462 7437 4408 7514 4428 7559
      4467 7531 4499 7485
TIME...MOT...LOC 1920Z 266DEG 31KT 4493 7479 4460 7519 4427 7547 
$$

Haynes

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 4, 2:07 PM EST	Special Weather Statement	BTV	Chittenden	23 min
Dec 4, 2:25 PM EST	Special Weather Statement	BTV	Chittenden	50 min
Dec 4, 2:48 PM EST	Special Weather Statement	BTV	Addison	42 min
Dec 4, 3:01 PM EST	Special Weather Statement	BTV	Caledonia, Franklin, Grand Isle, Lamoille, Washington	44 min
Dec 4, 3:15 PM EST	Special Weather Statement	BTV	Chittenden	30 min
Dec 4, 3:23 PM EST	Wind Advisory	BTV	Addison, Caledonia, Chittenden, Essex, Franklin, Grand Isle and 5 more	59 hr
Dec 4, 3:32 PM EST	Special Weather Statement	BTV	Grand Isle	28 min
Dec 4, 4:04 PM EST	Special Weather Statement	BTV	Chittenden, Lamoille, Washington	41 min
Dec 4, 4:07 PM EST	Special Weather Statement	BTV	Franklin, Grand Isle	38 min
Dec 4, 4:44 PM EST	Special Weather Statement	BTV	Franklin, Grand Isle, Lamoille	46 min
Dec 4, 2:56 PM EST	Special Weather Statement	BTV	Franklin	34 min

Nearby

Special Weather Statements in New York, 2021 Every 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.