Sunday August 18, 2019
Severe Thunderstorm Event
Mohawk Valley - Saratoga County Supercell - 90pm Malta Microburst

Albany National Weather Service Severe T'Storm Report - Malta Microburst - August 18, 2019 
For a third consecutive day, severe weather developed across eastern New York and western New England with the atmosphere again set up to support rotating updrafts (just as it was on the 17th) with any discrete thunderstorms that could form in what was a hot (temperatures in the mid to upper 80s), humid (dewpoints ranging from the mid to upper 60s to low 70s,) and subsequently highly unstable air mass with CAPE values (convective available potential energy) up around 2000j/kg, indicating significant fuel for thunderstorms. Unlike the severe weather on the previous day, however, which fired early in the afternoon, the storms on this day fired much later with the brunt of the severe weather across the local area during the early evening. The later thunderstorm show was largely due to a mostly cloudy morning with a stratus deck taking until about noon to burn off which slowed the day's heating process.

Triggering mechanisms were few with local terrain features and a lake breeze boundary over western New York being the main features to initiate t'storms, which initially were quite isolated. The main severe weather maker in the Mohawk valley, Saratoga, Washington and Bennington counties, responsible for the microburst in Malta at 6:35pm, was an isolated supercell that developed during the early afternoon along a lake breeze boundary over western New York. This rotating severe thunderstorm slowly tracked (average forward speed was only 20 mph) down the Mohawk valley through the afternoon and into Saratoga county during the evening, then into Washington and Bennington counties where it weakened through 8pm. Pockets of damaging wind and large hail occurred in the Mohawk valley with the most significant wind damage occurring in the Malta area in Saratoga County early in the evening.

Radar and Warnings graphic at 3:38pm - Sunday August 18, 2019 - Isolated supercell thunderstorm passing north of Utica at this time.

Radar and Warnings, 3:28pm Sunday August 18, 2019 

Radar and Warnings graphic at 4:50pm - Sunday August 18, 2019 - Isolated supercell thunderstorm into Fulton County.

Radar and Warnings, 4:52pm Sunday August 18, 2019 

Radar and Warnings graphic at 6:34pm - Sunday August 18, 2019
- Classic intense supercell thunderstorm over Malta in Saratoga County producing strong damaging wind and large hail at this time. Despite the wide radar shot and relatively low resolution of this graphic, one can still easily detect the classic hook shape to the storm with the most intense winds occurring in the notch area on the southern flank of the cell.

Radar and Warnings, 6:34pm Sunday August 18, 2019 

Additional thunderstorms developed in the Mohawk valley, Schoharie County and the Catskills (shown in the radar image above.) These thunderstorms evolved into a QLCS (quasi-linear convective system) which intensified producing pockets of damaging wind and frequent vivid cloud to ground lightning and torrential rainfall as it moved through the Capital Region, Hudson valley, and Berkshire County through 9pm. The two Instant Doppler 6 radar images below illustrate the scope of the thunderstorm development as well as the track and timing through the region.

Instant Doppler 6 Image at 6:45pm - Sunday August 18, 2019 - The supercell thunderstorm was east of I-87 in Saratoga County with intense thunderstorms developing over western Schenectady, Schoharie, Greene and Ulster counties at this time.

Instant Doppler 6 Image at 6:45pm Sunday August 18, 2019 

Instant Doppler 6 Image at 7:55pm - Sunday August 18, 2019 - The supercell thunderstorm was weakening over Bennington, VT at this time with a cluster of strong thunderstorms going through the Capital Region with gusty wind, torrential rain, and frequent cloud to ground lightning.

 Instant Doppler 6 Image at 7:55pm Sunday August 18, 2019

 
NWS Storm Reports for Sunday August 18, 2019. 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 which may have occurred.

Town County Severe Weather Report Time
Newport Herkimer Wind Damage: Trees and wires blown down 3:54pm
Middleville Herkimer Wind Damage: Trees and wires blown down 4:04pm
Salisbury Herkimer Wind Damage: Trees and wires blown down 4:22pm
Hopewell Junction Dutchess Wind Damage: Trees and wires blown down 5:04pm
Caroga Lake Fulton Large Hail: Measured 1.25" Diameter 5:05pm
Malta Saratoga 90 mph Microburst - Significant damage to trees, power lines, damage to road signs on the Northway near exit 12, trees down on cars 6:34pm
Malta Saratoga Large Hail: Measured 1.00" Diameter 6:33pm
Round Lake Saratoga Large Hail: Measured 1.00" Diameter 6:34pm
Kerhonkson Ulster Wind Damage: Trees and wires blown down 6:47pm
Johnsonville Rensselaer Wind Damage:Trees and wires blown down 7:08pm
Hawthorne Hill Schenectady Wind Damage: Tree blown down blocking a road 7:15pm
Hoosick Falls Rensselaer Wind Damage: Tress and wires blown down 7:25pm
Pleasant Valley Dutchess Wind Damage: Multiple trees blown down 7:30pm
LaGrange Dutchess Wind Damage: Multiple trees blown down 7:30pm
Westerlo Albany Wind Damage: Trees blown down 7:30pm
New Scotland Albany Wind Damage: Trees blown down 7:40pm
Watervliet Albany Wind Damage: Trees blown down 7:40pm

 

Storm Reports For Sunday August 18, 2019

Storm Prediction Center Storm Reports For August 17, 2019 

Quarter sized hail in Ballston Spa - Photo Credit Eric Bowers

Quarter sized hail in Ballston Spa - Saratoga County - August 18, 2019 

Tree damage in Malta along the Zim Smith Bike Path - Photo Credit Eric Bowers

Wind damage in Malta along the Zim Smith bike path 

Tree damage in Malta along the Zim Smith Bike Path - Photo Credit Eric Bowers

Wind damage in Malta along the Zim Smith bike path 

The money shot - Catskill, Greene County Sunday evening August 18, 2019
Photo Credit: WeatherNet 6 Spotter Steve Meicht

Lightning and rainbow in Catskill Sunday evening August 18, 2019