Wednesday June 8, 2011
Major Severe Weather Outbreak

A widespread outbreak of severe thunderstorms consisting of several lines and clusters impacted eastern New York and western New England between 5pm June 8 through 1:30 am on June 9.  The most concentrated portion of the outbreak occurred between 5pm and 9pm where numerous severe thunderstorms produced widespread hail, (one of the most widespread hail events in the past few years) some of it the size of baseballs.  Scattered pockets of wind damage also accompanied the strongest cells during this period over especially the Adirondacks as well as the mid Hudson valley into Berkshire County, MA.  A second line of severe t’storms developed over Otsego County between 10:00pm and 10:30pm expanding east through the Schoharie valley, mid Hudson valley and Berkshire and Litchfield counties through 1:30am Thursday June 9.  Scattered hail up to 2.75 ” in diameter (baseball sized) as well as pockets of wind damage and frequent lightning occurred with this zone of thunderstorms.

Set-Up

A hot and potentially very unstable atmosphere existed over the region on June 8.  Air temperature surged into the lower 90s with dewpoints ranging from 65° to 70°.  CAPE values (convective available potential energy) grew to between 3500 and 4000 j/kg (very large values of potential instability) above a strong capping inversion across the region (warm layer of air aloft.)  The capping inversion effectively kept a lid on thunderstorm development through the day suppressing updraft formation.  Further inhibiting thunderstorm development was the lack of any kind of trigger mechanism in the region. There were no fronts or surface troughs or apparent small upper level disturbances, i.e.: colder pockets of air aloft, to focus thunderstorms.
 
Thunderstorm development, however, did occur late in the afternoon in two areas.  The first area that generated quite a bit of excitement was over Ontario, Canada as a severe MCS (mesoscale convective system,) which had first initiated over northern Michigan, was racing across lake Ontario into the Adirondacks.  This MCS triggered the issuance of a severe t’storm watch for the Adirondacks, Mohawk and Schoharie valleys, Capital Region and VT at 4:15pm.  However, the MCS broke apart as it moved into the Adirondacks losing much of its punch…but was able to maintain a broken leading edge which did produce damaging wind in pockets in Herkimer and Hamilton counties with wind gusts up to 61 mph.  Simultaneously, and possibly caused by a very subtle upper air disturbance producing some slight cooling aloft causing the cap to weaken, allowed isolated t’storms to form over Schenectady and Albany counties by 5pm.  With the cap broken, the isolated Capital Region thunderstorms explosively developed in the highly unstable atmosphere quickly becoming severe producing widespread large damaging hail as the cluster grew on its east to southeast trek through the mid Hudson valley into Berkshire County through the evening.  Meanwhile, other severe thunderstorms explosively developed over northern Otsego and southern Herkimer counties, linking up with the remnant leading edge of the Adirondack MCS to produce a major line of severe thunderstorms which then moved through the Mohawk and Schoharie valleys, Catskills, Capital Region, Vermont, the mid Hudson valley, Berkshire and Litchfield counties through 9pm.  Frequent lightning, widespread large hail and pockets of damaging wind occurred with the passage of this line.  The severe t’storm watch was expanded in segments to include initially Greene, Columbia and Berkshire counties, and then to finally include Ulster, Dutchess, and Litchfield counties prior to the conclusion of the event.

A second severe t’storm watch was issued at 9pm for the Mohawk valley, Adirondacks, and Lake-George Saratoga region to account for a second severe MCS tracking over Lake Ontario and into the Adirondacks.  This MCS, like the first one, completely fell apart after crossing lake Ontario leaving only widely scattered showers and t’storms for that region with no severe weather reported.  However, south of the watch zone, a short line of severe thunderstorms developed over Otsego County between 10pm and 10:30pm.  This line expanded into the Schoharie valley, tracking through southern Albany, Greene, southern Rensselaer, Delaware, Ulster, Dutchess, central and southern Berkshire, and Litchfield counties through 1:30am Thursday June 9.  Scattered hail ranging from an inch to 2.75" in diameter and pockets of minor wind damage occurred as well as frequent lightning with the passage of this line.

Instant Doppler 6 Radar Images

6:50pm June 8, 2011
Instant Doppler 6, 6:50pm June 8, 2011

7:28pm June 8, 2011

Instant Doppler 6, 7:28pm June 8, 2011 

8:10 pm June 8, 2011

Instant Doppler 6, 8:10pm June 8, 2011 

 

STORM REPORTS June 8, 2011 (Main Outbreak)
Mostly large hail fell, except in the Adirondacks where storms associated with the remnant MCS produced considerable wind damage

Town County Storm Report Time
Rotterdam Schenectady Estimated 1" diameter Hail 4:55pm
5 Miles SSW of Clifton Park Schenectady Estimated 0.88" diameter Hail 4:58pm
1 Mile NE of Rotterdam Schenectady Estimated 1" diameter Hail 5:00pm
Schenectady Schenectady Estimated 1" diameter Hail 5:05pm
Rotterdam Schenectady 0.88" diameter Hail 5:09pm
3 Miles NW of Colonie Schenectady Measured 1" diameter Hail 5:13pm
Guilderland Albany Estimated 1" diameter Hail 5:44pm
1 Mile SSW of Albany Albany Estimated 1" diameter Hail 5:45pm
3 Miles NW of Albany Albany Measured 1" diameter Hail at the NWS office on Fuller Road 5:50pm
Colonie Albany Estimated 1" diameter Hail 5:50pm
Albany Albany Estimated 1" diameter Hail 5:54pm
1 Mile So. of Albany Albany 1.5" diameter Hail 5:54pm
Poland Herkimer Estimated 1" diameter Hail 5:54pm
Loudonville Albany Estimated 1" diameter Hail 5:55pm
North Greenbush Rensselaer Estimated 1" diameter Hail 6:00pm
2 Miles SSW of Albany Albany Estimated 1.5" diameter Hail 6:01pm
Poland Herkimer Measured 1.75" diameter Hail (Golf Ball Sized) 6:01pm
Rensselaer Rensselaer Estimated 1.75" Hail 6:01pm
Old Forge Herkimer T'Storm Wind Damage, Trees and Wires blown down 6:08pm
4 Miles NNW Cedarville Herkimer Estimated 1.5" diameter Hail 6:14pm
East Nassau Rensselaer Estimated 1" diameter Hail 6:27pm
Springfield Otsego T'Storm Wind Damage, trees blown down 6:31pm
Indian Lake Hamilton T'Storm Wind Damage, Trees and Wires blown down 6:31pm
Sabael Hamilton T'Storm Wind Damage, Trees and Wires blown down 6:31pm
East Chatham Columbia Estimated 1" diameter Hail 6:35pm
Speculator Hamilton T'Storm Wind Damage, Trees and Wires blown down 6:35pm
Wells Hamilton Measured 61 mph wind gust 6:37pm
Herkimer Herkimer Estimated 1" diameter Hail 6:40pm
Canaan Center Columbia Estimated 1" diameter Hail 6:40pm
1 Mile NW of Herkimer Herkimer Estimated 1" diameter Hail 6:44pm
Richfield Springs Otsego T'Storm Wind Damage, trees blown down blocking Route 20 6:45pm
2 Miles WNW of Canaan Columbia 1.25" diameter Hail, windows reported broken 6:45pm
Johnsburg Warren T'Storm Wind Damage 6:45pm
2 Miles No of Horicon Warren T'Storm Wind Damage, trees and wires blown down 6:50pm
West Stockbridge, MA Berkshire Estimated 1" diameter Hail 6:56pm
Chestertown Warren T'Storm Wind Damage, Trees and wires blown down 6:57pm
Canann Center Columbia Estimated 1" diameter Hail 7:00pm
Hannacroix Greene Estimated 1.5" diameter Hail 7:00pm
Coxsackie Greene Measured 3" diameter Hail (Larger than baseball sized) 7:05pm
Fort Plain Montgomery Estimated 1" diameter Hail 7:08pm
Guilderland Center Albany T'Storm Wind Damage, trees down, power outages 7:32pm
Saratoga Springs Saratoga T'Storm Wind Damage, 2 large trees blown down 7:36pm
NE of Saratoga Saratoga Estimated 2" diameter Hail, estimated 50 mph gust 7:40pm
Stottville Columbia T'Storm Wind Damage, Trees and wires blown down 7:44pm
Copake Columbia T'Storm Wind Damage, Trees and wires blown down on County Route 7A 7:48pm
Acra Greene Estimated 1.75" Diameter Hail 8:00pm
New Baltimore Greene Measured 3" Diameter Hail 8:00pm
Pittsfield, MA Berkshire Estimated 1.75" Diameter Hail 8:00pm
East Chatham Columbia Estimated 1" diameter Hail 8:00pm
Pittsfield, MA Berkshire Measured 1" diameter Hail 8:05pm
Cannan, CT Litchfield Estimated 1.75" diameter Hail 8:10pm
Pittsfield, MA Berkshire Estimated 1.5" diameter Hail 8:10pm
Catskill Greene Estimated 1" diameter Hail 8:20pm
Stockbridge, MA Berkshire T'Storm Wind Damage, numerous trees blown down 8:20pm
Lenox, MA Berkshire T'Storm Wind Damage, trees down, one injured 8:24pm
Germantown Columbia Estimated 1" diameter Hail 8:25pm
Churchtown Columbia Estimated 1" diameter Hail 8:30pm
Germantown Columbia 3/4" diameter Hail 8:30pm
Hillsdale Columbia Estimated 0.88" diameter hail 8:30pm
Tivoli Dutchess Estimated 1.75" diameter Hail 8:45pm
Saugerties Ulster Estimated 1" diameter Hail, window reported broken 8:45pm
Saugerties Ulster Estimated 1" diameter Hail 8:47pm
6 Miles E. of Saugerties Columbia Estimated 1" diameter Hail 8:54pm
Falls Village, CT Litchfield Estimated 1" diameter hail 9:03pm
Red Hook Dutchess 3/4" diameter Hail 9:05pm
Sharon, CT Litchfield 1" diameter Hail 9:14pm

STORM REPORTS for the Second Event from 10pm to 1:30am on June 9, 2011

Town County Storm Report Time
Morris Otsego Measured 1.25" diameter Hail 10:40pm
Maryland Otsego T'Storm Wind Damage, trees and wires blown down 11:05pm
Oneonta Otsego Measured 1" diameter Hail 11:10pm
Jefferson Schoharie 3/4" diameter Hail 11:30pm
East Durham Greene 3/4" diameter Hail 11:55pm
Becket, MA Berkshire Measured 1" diameter Hail 12:35am June 9
Palenville Greene T'Storm Wind Damage, Tree Limbs down on Borgart Rd. 12:35am June 9
Red Hook Dutchess Estimated 2.75" diameter Hail (Baseball Sized) 12:35am June 9
Becket, MA Berkshire Measured 1" diameter Hail 12:35am June 9
Catskill Greene 0.88" diameter Hail 12:38am June 9
Kingston Ulster Measured 1" diameter Hail 1:00am June 9
Stone Ridge Ulster Measured 1.25" diameter Hail 1:05am June 9
Tillson Ulster Estimated 1" Hail, 50-60 mph wind gusts 1:09 am June 9
Rosendale Ulster Measured 1" Hail 1:10am June 9
Cottekill Ulster T'Storm Wind Damage, trees limbs down, Nickel Sized hail 1:10am June 9

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Storm Pictures


Photographer: WeatherNet 6 spotter Steve Meicht...These are pictures of a thunderstorm shelf cloud taken in Catskill, Greene County Wednesday evening, June 8, 2011
Shelf cloud going over Catskill, NY June 8, 2011
Shelf cloud going over Catskill, NY, June 8, 2011
Photographer: CBS6 Viewer Beau Duffy. Shelf cloud moving over Troy, NY during the late afternoon on Wednesday June 8, 2011
Shelf cloud going over Troy, NY June 8, 2011
Shelf cloud going over Troy, NY, June 8, 2011
Photographer: CBS6 Chief Meteorologist Steve LaPointe (Left Photograph) and CBS6 viewer Janis Malanowski (Right Photograph) Both shots are of Mammatus clouds in the wake of the severe thunderstorms. The left photograph is of mammatus over the CBS6 studios in Niskayuna during the evening of June 8. The mammatus clouds in the right photograph were over Duanesburg around 8pm
Mammatus clouds over the CBS6 studios in Niskayuna, NY June 8, 2011
Mammatus clouds over Duanesburg, NY, June 8, 2011, 8pm
Left Photograph: Photographer: CBS6 viewer Ben Karaszkiewicz. This is giant hailstone (2.5" to 3" in diameter) that fell on Coxsackie, Greene County. Right Photograph: CBS6 viewer Scott Engle, a lightning strike over Amsterdam, Montgomery County
Giant hailstone from Coxsackie, NY June 8, 2011
Lightning strike in Amsterdam, NY, June 8, 2011, 8pm