Friday July 1, 2016
Severe T'Storm Event - Long Track Supercell
Schenectady 80-90 mph Downburst
Clermont-Germantown Late Night Downburst

The first severe weather event of the warm season (late in coming this year) occurred on Friday July 1, 2016 as a combination of a surge in surface moisture coupled with cooling aloft and an advancing pre-frontal convergence zone and cold front came together in an environment of moderate to strong speed and directional wind shear to provide the mechanisms for strong thunderstorm development during the afternoon. Wind damage and large hail occurred, largely along the path of one supercell thunderstorm which began along the Delaware-Schoharie County border area around 2pm. The storm tracked to the ENE through it's lifecycle up through Schoharie County, crossing into NW Albany County, then up through much of Schenectady and southern Saratoga counties, ultimately into southern Washington County before passing through central and NE Bennington counties through 6:30pm. Pockets of wind damage from downbursting and large hail up to 1" in diameter occurred along the path of the storm. Significant wind damage occurred in and around Schenectady's central park due to an estimated 80-90 mph (NWS report) downburst with considerable wind damage also reported in Manchester, VT.

A severe thunderstorm also produced pockets of wind damage in Warren County during the afternoon around Warrensburg and Glens Falls. And a surprisingly intense thunderstorm right along the cold front occurred between 11:30pm and midnight produced significant wind damage in Columbia County in the Clermont and Germantown areas, long after the main rounds of afternoon convection had ended.

Supercell thunderstorm path Friday afternoon and evening July 1, 2016

Supercell thunderstorm path Friday July 1, 2016 - 2pm through 6:30pm

Set Up
An active convective day, the first of the 2016 warm season, was well forecast for eastern New York and western New England in the twenty four hours preceding the event, with the usual uncertainties of level of sunshine and instability, in play. The morning of July 1 dawned with strong sunshine, but dry air in place with dewpoints generally in the 50s. However, a moderately strong short wave trough over the Great Lakes states was pushing a surface low up the St. Lawrence valley which in turn was swinging a strong cold front and pre-frontal trough into upstate western New York through the morning. A strong south to southeast surface flow set up over eastern New York and western New England (gusts to 25 mph common) which allowed low and mid 60 degree dewpoints, which had been sitting over the mid Atlantic, to quickly flow north into the region as the day progressed. Strong heating continued into the early afternoon allowing temperatures to climb into the mid 80s. Net instability, or CAPE values climbed as high as 1500 j/kg, which is not exceptionally high, but more than sufficient in the highly wind sheared environment which had developed to support severe rotating thunderstorms. By the late morning the Storm Prediction Center had upgraded the region to an enhanced risk of severe thunderstorms and issued a tornado watch for all of eastern New York and western New England by 1:30pm. (The tornado watch was issued vs. the more common severe thunderstorm watch due to the substantial turning of the wind and increasing of the wind with height which was present over the Northeast. This "Wind Shear" is supportive of rotating, or supercell thunderstorms, which sometimes produce tornadoes.)

Storms were slow to get organized through the early afternoon with the first of the activity getting underway over central New York with a few isolated storms in Otsego and Delaware counties which were illustrating weak mid level updraft rotation through 2pm. Although thunderstorms ultimately became widespread throughout the Mohawk valley, Adirondacks, Capital Region and Vermont, (remaining isolated in the eastern Catskills and mid Hudson valley) it was one of the first storms to form along the Delaware-Schoharie County line around 2pm which became the primary severe weather producer as it made its way into Schenectady County from 4pm to 4:30pm, intensifying as it encountered a richer supply of low level moisture and enhanced turning of the wind in the Mohawk and Hudson valley convergence area. A tornado warning was issued on the storm as it was moving into southern Washington County at 5:11pm with the rotational signature on radar supporting a possible tornado. In the end, no tornado was confirmed but pockets of wind damage and large hail did occur along the path up through Manchester, VT, where over 2" of rain also fell. The supercell was quickly followed by another cluster of torrential thunderstorms which moved through most areas from the Mohawk river on north and east into and through Bennington County VT through 7:30pm. Storm tops with the supercell and the cluster of storms which immediately followed it at times popped to up around 50,000 to 55,000 feet.

Albany Doppler Radar Image at roughly the time the 80-90 mph microburst in Schenectady was occurring with the small but potent supercell tracking through the eastern part of the County - 4:17pm July 1, 2016

Albany Doppler Radar Base Reflectivity 4:17pm July 1, 2016 showing the supercell over Schenectady at the time it was producing damaging wind and large hail up to one inch in diameter  

Albany Doppler radar image at 4:38pm showing the supercell over Clifton Park where it was producing hail up to 1" in diameter, Friday July 1, 2016

Albany Doppler Base Reflectivity 4:38pm, Friday July 1, 2016 

The supercell over the Mechanicville/Stillwater area as it was about to cross in to SW Washington County. This radar image showed the storm nineteen minutes before a tornado warning for Washington and Bennington counties was issued, in effect from 5:11pm until 5:45pm, Friday July 1, 2016.

Albany Doppler base reflectivity image at 4:52pm, showing the supercell approaching SW Washington County, Friday July 1, 2016 

The Warren County severe thunderstorm at 4:41pm, responsible for some wind damage in and around Warrensburg and Glens Falls between 4:45pm and 5:20pm Friday July 1, 2016

Albany Doppler base reflectivity image at 4:41pm, showing showing a severe thunderstorm over Warren County, Friday July 1, 2016

NWS Storm Reports for Friday July 1, 2016. Note, these reports are used to verify the NWS warnings which were issued for this event and therefore do not necessarily represent an accounting for all of the wind damage and hail which may have occurred during the event.

Town County Storm Report Time
Jefferson Schoharie Trees and wires blown down 2:42pm
Fultonham Schoharie Trees and wires blown down 3:04pm
Middleburgh Schoharie Trees and wires blown down 3:13m
Poughkeepsie Ulster 0.88" diameter hail 3:38pm
Arlington Dutchess Trees and wires blown down 3:45m
Freedom Plains Dutchess Measured 1" diameter hail 3:45pm
Coldbrook Schenectady Measured 0.88" diameter hail 4:13pm
Schenectady Schenectady Large tree limbs blown down on Union Street 4:17pm
Schenectady Schenectady Significant wind damage in Central Park from an 80-90 mph downburst 4:17pm
Downtown Schenectady Schenectady Measured 1" diameter hail 4:20pm
Schenectady Schenectady Multiple trees down on Union Street 4:25pm
Schenectady Schenectady FLASH FLOOD: One foot of water on State St. between Robinson St. and James St. 4:25pm
1 Mile SW of Ushers Saratoga Measured 1" diameter hail 4:39pm
1 Mile S. of Ushers Saratoga Measured 1" diameter hail 4:42pm
Warrensburg Warren Wind damage: trees and wires blown down 4:45pm
South Easton Washington Wind damage: Trees and wires blown down at the intersection of South Cambridge Rd. and Beadle Hill Rd. 5:07pm
Glens Falls Warren Wind damage: tree down on a house at 93 Bay Street, wires also down 5:19pm
Manchester, VT Bennington Measured 1" diameter hail 5:50pm
Manchester, VT Bennington Wind damage: Numerous trees and limbs down 5:50pm
1 Mile SSE of Manchester, VT Bennington Several trees and wires blown down on River Road 5:57pm
Manchester, VT Bennington Trees and wires blown down (2nd severe t'storm) 6:40pm
1 Mile WSW Minnehaha Herkimer Trees blown down 8:20pm
Saugerties Ulster Wind damage: Trees and power lines blown down 11:39pm
2 Miles ENE of Malden-on-Hudson Columbia Trees blown down, some on homes 11:44pm
1 Mile W of Viewmonte Columbia Mobile home roof blown off by wind, trees and wires also blown down and across roads 11:45pm
Clermont Columbia Significant tree damage from the wind 11:45pm-Midnight
Germantown Columbia Significant tree damage from the wind 11:4pm-Midnight


Rotating wall cloud over Altamont, Friday afternoon, July 1, 2016: Photograph contributed via facebook by WeatherNet 6 spotter Robbie Venditti


Rotating wall cloud over Altamont, Albany County Friday afternoon July 1, 2016



Possible funnel cloud along Route 40 in Easton, Washington County - This could also be a portion of a shelf cloud, which is a very different cloud feature. It's difficult to tell from the photograph - Photograph contributed via facebook by Melissa Robertson

Wind Damage, Glens Falls, April 7, 2016

Shelf cloud going over Glenville, Schenectady County Friday afternoon July 1, 2016: Photograph contributed via facebook by Carl Bond


Shelf cloud going over Glenville, Schenectady County, Friday afternoon July 1, 2016

Large hail in Clifton Park, Friday afternoon July 1, 2016: Photograph contributed via facebook by Nancy Thompson Runyon

Large hail in Clifton Park, Saratoga County, Friday afternoon July 1, 2016 

Rainfall was locally torrential with over 2" reported in some places in the Capital Region up through Manchester, VT where multiple torrential thunderstorms rolled through. Where thunderstorms were more spotty in nature in the eastern Catskills and mid Hudson valley, rainfall was much lighter.

WeatherNet 6 Rainfall Reports for Friday July 1, 2016

Town County Rainfall Report Town County Rainfall Report
Pittsfield, MA Berkshire 0.57" Lanesborough, MA Berkshire 0.25"
           
Westmere Albany 0.83"      
           
Livingston Columbia 0.24" Ancramdale Columbia 0.39"
           
Norton Hill Greene 0.05" Greenville Greene 0.15"
Round Top Greene Trace      
           
Arkville Delaware 0.30"      
           
Palatine Bridge Montgomery 0.42" Amsterdam Montgomery 0.56"
Florida Montgomery 0.46" Fonda Montgomery 0.37"
           
Fish House Fulton 0.60" Broadalbin Fulton 0.50"
           
East Worcester Otsego 0.11" Oneonta Otsego 0.20"
           
Speigletown Rensselaer 1.20" Center Brunswick Rensselaer 0.34"
Lansingburgh Rensselaer 1.50"      
           
Milton Saratoga 0.60" Wilton Saratoga 0.92"
Clifton Park (Oaks) Saratoga 1.90"      
           
Rotterdam Schenectady 0.72"      
           
Phoenicia Ulster 0.15" Saugerties Ulster 0.15"
Whiteport Ulster 0.05"      
           
Warrensburg Warren 0.80" Lake Luzerne Warren 0.50"
           
Hartford Washington 1.10" Hebron Washington 0.58"
           
Woodford, VT Bennington 1,.02" Manchester, Vt Bennington 2.16" to 2.82"
Landgrove, VT Bennington 1.73" Danby, VT Rutland 0.18"

Germantown Tree Damage From the Severe Storm between 11:30pm and midnight
Photographs contributed via facebook by Kimberly Buchanan

Wind damage in Germantown, Columbia County late Friday night July 1, 2016

Wind damage in Germantown, Columbia County late Friday night July 1, 2016 


Wind damage in Germantown, Columbia County late Friday night July 1, 2016

 

Wind damage in Germantown, Columbia County late Friday night July 1, 2016

Wind damage in Germantown, Columbia County late Friday night July 1, 2016 

Wind Damage From Manchester, VT- Photographs Contributed via email from Christopher Wright

Wind damage in Manchester, VT, Friday evening July 1, 2016 

Wind damage in Manchester, VT, Friday evening July 1, 2016