Alert archive / Vermont / Heat Advisories in 2021

Heat Advisory 6, NWS Burlington, VT

August 21, 2021Chittenden County, Franklin County, Vermont; Franklin County, St. Lawrence County, New York

NWS Burlington, VT issued this heat advisory at Aug 21, 2021, 3:21 AM EDT for Chittenden County, Franklin County, Vermont; Franklin County, St. Lawrence County, New York. It took effect at Aug 21, 2021, 12:00 PM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Aug 21, 2021, 3:21 AM EDT (07:21 UTC)
In effect from
Aug 21, 2021, 12:00 PM EDT
Expired
Aug 21, 2021, 7:00 PM EDT
In force
7 hr
Issued by
NWS Burlington, VT

Counties Franklin County, NY, St. Lawrence County, NY, Chittenden County, VT, Franklin County, VT

The radar

The Burlington radar (KCXX), 55 km from the middle of the area, began a volume at 07:21 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

Brookhaven, NY (KOKX), launched 00:00Z, 7.4 hours before the alert went out and 423 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, Brookhaven, NY at 00:00Z on 2021-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 244 joules per kilogram.LCLEL10008507005003002001001 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, Brookhaven, NY at 00:00Z on 2021-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
244 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 4:07 PM EDTSpecial Weather StatementBTVSt. Lawrence23 min

Nearby

Heat Advisories in Vermont, 2021Heat Advisories in New York, 2021Every heat 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.