Alert archive / Vermont / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 30, NWS Burlington, VT

July 28, 2018Addison County, Washington County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 28, 2018, 12:02 AM EDT for Addison County, Washington County, Vermont. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 28, 2018, 12:02 AM EDT (04:02 UTC)
Expired: Jul 28, 2018, 1:00 AM EDT
In force: 58 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Addison County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 46 km from the middle of the area, began a volume at 04:02 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 00:00Z, 4.0 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-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: 495 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1197 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Burlington, VT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 4:10 PM EDT, 7 hours 52 minutes earlier.

Area forecast discussion, Jul 27, 4:10 PM EDT, 7 hours 52 minutes before

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Hazardous weather outlook, Jul 27, 3:20 AM EDT, 20 hours 42 minutes before

Hazardous Weather Outlook
National Weather Service Burlington VT
320 AM EDT Fri Jul 27 2018

NYZ026>031-034-035-087-VTZ001>012-016>019-280730-
Northern St. Lawrence-Northern Franklin-Eastern Clinton-
Southeastern St. Lawrence-Southern Franklin-Western Clinton-
Western Essex-Eastern Essex-Southwestern St. Lawrence-Grand Isle-
Western Franklin-Orleans-Essex-Western Chittenden-Lamoille-Caledonia-
Washington-Western Addison-Orange-Western Rutland-Windsor-
Eastern Franklin-Eastern Chittenden-Eastern Addison-Eastern Rutland-
320 AM EDT Fri Jul 27 2018

This Hazardous Weather Outlook is for northern New York, central
Vermont, northeast Vermont, northwest Vermont and southern Vermont.

.DAY ONE...Today and tonight.

Scattered showers and thunderstorms are expected to develop across
much of the region this afternoon, with the main focus being from the
Champlain Valley southeastward. Some storms may become strong to
locally severe with gusty winds, small hail and torrential rainfall
possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jul 27, 6:15 PM EDT, 5 hours 47 minutes before

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Special weather statement, Jul 27, 7:32 PM EDT, 4 hours 30 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 9:39 PM EDT	Special Weather Statement	BTV	Chittenden	51 min
Jul 27, 10:15 PM EDT	Special Weather Statement	BTV	Franklin, Lamoille, Orleans	60 min
Jul 27, 11:36 PM EDT	Special Weather Statement	BTV	Addison	54 min
Jul 28, 1:11 AM EDT	Special Weather Statement	BTV	Caledonia, Orange, Washington	64 min
Jul 28, 2:14 AM EDT	Special Weather Statement	BTV	Caledonia	61 min
Jul 28, 1:49 PM EDT	Special Weather Statement	BTV	Chittenden	41 min
Jul 28, 3:05 PM EDT	Special Weather Statement	BTV	Windsor	55 min
Jul 28, 5:25 PM EDT	Special Weather Statement	BTV	Caledonia	35 min
Jul 28, 5:34 PM EDT	Special Weather Statement	BTV	Caledonia, Washington	56 min
Jul 28, 5:56 PM EDT	Special Weather Statement	BTV	Addison	34 min
Jul 28, 6:29 PM EDT	Special Weather Statement	BTV	Caledonia	31 min
Jul 28, 6:35 PM EDT	Special Weather Statement	BTV	Caledonia	25 min
Jul 28, 6:41 PM EDT	Special Weather Statement	BTV	Grand Isle	34 min
Jul 28, 7:01 PM EDT	Special Weather Statement	BTV	Essex	59 min
Jul 28, 7:20 PM EDT	Special Weather Statement	BTV	Rutland	55 min
Jul 28, 10:54 AM EDT	Special Weather Statement	BTV	St. Lawrence	66 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2018 Every severe thunderstorm warning in 2018

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.