Alert archive / Vermont / Mesoscale Discussions in 2020

Mesoscale Discussion 1735

October 10, 2020Coos County, Grafton County, New Hampshire; 11 counties in New York; 12 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2020, 6:44 PM EDT for Coos County, Grafton County, New Hampshire; 11 counties in New York; 12 counties in Vermont. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 10, 2020, 6:44 PM EDT (22:44 UTC)
Expired: Oct 10, 2020, 8:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 499

All 25 counties

Coos County, NH, Grafton County, NH, Clinton County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Oneida County, NY, Saratoga 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, Windsor County, VT

The radar

The Burlington radar (KCXX), 77 km from the middle of the area, began a volume at 22:46 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, 10.7 hours before the alert went out and 133 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: 1707 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 283 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
Oct 10, 4:38 PM EDT	Mesoscale Discussion	SPC	Coos	97 min
Oct 10, 1:48 PM EDT	Mesoscale Discussion	SPC	Clinton, Essex, Franklin, Hamilton, Herkimer, Jefferson and 3 more	87 min
Oct 10, 2:13 PM EDT	Severe Thunderstorm Watch	SPC	Clinton, Essex, Franklin, Fulton, Hamilton, Herkimer and 5 more	7 hr

Nearby

Mesoscale Discussions in Vermont, 2020 Mesoscale Discussions in New York, 2020 Mesoscale Discussions in New Hampshire, 2020 Every mesoscale discussion in 2020

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.