Alert archive / Vermont / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 42, NWS Burlington, VT

June 29, 20084 counties in Vermont; Clinton County, Essex County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jun 29, 2008, 9:48 PM EDT for 4 counties in Vermont; Clinton County, Essex County, New York. It was in force for 57 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: Jun 29, 2008, 9:48 PM EDT (01:48 UTC)
Expired: Jun 29, 2008, 10:45 PM EDT
In force: 57 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon

Counties Clinton County, NY, Essex County, NY, Chittenden County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT

The radar

The Burlington radar (KCXX), 11 km from the middle of the area, began a volume at 01:48 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 29, 8:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 29, 4:11 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 1.8 hours before the alert went out and 218 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: 618 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.5

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 Jun 29, 7:37 PM EDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jun 29, 7:37 PM EDT, 2 hours 11 minutes before

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Hazardous weather outlook, Jun 29, 4:16 PM EDT, 5 hours 32 minutes before

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In the hours before

Special weather statement, Jun 29, 5:19 PM EDT, 4 hours 29 minutes before

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Special weather statement, Jun 29, 5:24 PM EDT, 4 hours 24 minutes before

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Local storm report, Jun 29, 5:46 PM EDT, 4 hours 2 minutes before

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Special weather statement, Jun 29, 5:51 PM EDT, 3 hours 57 minutes before

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Special weather statement, Jun 29, 6:38 PM EDT, 3 hours 10 minutes before

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Special weather statement, Jun 29, 6:57 PM EDT, 2 hours 51 minutes before

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Nearby

Severe Thunderstorm Warnings in Vermont, 2008 Severe Thunderstorm Warnings in New York, 2008 Every severe thunderstorm warning in 2008

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.