Alert archive / Vermont / Mesoscale Discussions in 2016

Mesoscale Discussion 1369

July 23, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2016, 11:46 AM EDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2016, 11:46 AM EDT (15:46 UTC)
Expired: Jul 23, 2016, 1:45 PM EDT
In force: 119 min
Issued by: the Storm Prediction Center

All 26 counties

Oxford County, ME, Belknap County, NH, Carroll County, NH, Coos County, NH, Grafton County, NH, Merrimack County, NH, Strafford County, NH, Sullivan County, NH, Clinton County, NY, Essex County, NY, Franklin County, NY, Warren County, NY, Washington County, NY, Addison 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), 60 km from the middle of the area, began a volume at 15:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 411Jul 23, 3:10 PM EDT

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 3.8 hours before the alert went out and 189 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: 1588 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 3:10 PM EDT	Severe Thunderstorm Watch	SPC	York	4 hr
Jul 23, 4:43 PM EDT	Mesoscale Discussion	SPC	Cumberland, York	92 min
Jul 23, 6:36 PM EDT	Mesoscale Discussion	SPC	York	54 min

Nearby

Mesoscale Discussions in Vermont, 2016 Mesoscale Discussions in New Hampshire, 2016 Mesoscale Discussions in New York, 2016 Every mesoscale discussion in 2016

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.