Alert archive / Vermont / Mesoscale Discussions in 2017

Mesoscale Discussion 1448

August 5, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2017, 11:36 AM EDT for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Aug 5, 2017, 11:36 AM EDT (15:36 UTC)
Expired: Aug 5, 2017, 1:30 PM EDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 34 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Albany County, NY, Columbia County, NY, Dutchess County, NY, Rensselaer County, NY, Saratoga County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 130 km from the middle of the area, began a volume at 15:36 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, 3.6 hours before the alert went out and 110 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: 478 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Vermont, 2017 Mesoscale Discussions in New Hampshire, 2017 Mesoscale Discussions in New York, 2017 Every mesoscale discussion in 2017

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.