A strong upper level storm system moved across the region Tuesday and forced a strong cold front across New York and Pennsylvania. Two separate lines of showers and thunderstorms quickly developed across the region among a very unstable atmosphere.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS BGM wrote it up.
A strong upper level storm system moved across the region Tuesday and forced a strong cold front across New York and Pennsylvania. Two separate lines of showers and thunderstorms quickly developed across the region among a very unstable atmosphere. As these lines moved east, the storms quickly became severe and produced damaging winds, large hail and a few tornadoes.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Binghamton, NY wrote its last area forecast discussion before the first event at Aug 22, 9:58 AM EST, 4 hours 10 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 1058 AM EDT Tue Aug 22 2017 .SYNOPSIS... A cold front will push through the area this afternoon and evening triggering strong thunderstorms. A significant severe weather event is likely with this activity with the primary threat damaging winds. Pleasant weather will return on Wednesday with clearing skies and lower humidities. && .NEAR TERM /THROUGH WEDNESDAY/... 1030 AM Update... Strongly forced system upstream of NY/PA will continue to advance upon destabilizing atmosphere here this afternoon, and forecast for an episode of strong-severe thunderstorms is still on the mark. The environmental lid is slowly eroding with MLCAPE still expected to climb to around 1500-2000 J/KG prior to convective development. Analyzed effective shear still looking good upstream and will move over the region later today in tandem with heating. Convective mode looks to be mixed and transitional today with possibility for multi-cells and discrete supercells toward mid-late afternoon, followed by linear features moving through early this evening. Only real changes to forecast were to adjust timing/PoPs according to most recent mesoscale model forecasts, which improved the late morning and early afternoon hours to mainly rain free and sunny conditions, with best chances for +TSRA moving in late day/early evening. PWAT values are significantly anomalous, which brings a localized flood threat into concern...however, the event should be rather progressive in this flow with no glaring hints for training storms. We've had several days-weeks now where much of the area has dried out, so antecedent conditions aren't as much of an issue as earlier this summer. Urban areas most likely will have the biggest issues with street flooding, as even a normal speed storm cell will still be capable of producing an inch of rain in less than an hour today. With Convective Outlook as Enhanced today, we do expect to see some sort of Watch event coming out of SPC for our area this afternoon. Threat primarily wind gust damage, but brief tornadic activity not out of the question. Rest of discussion stands for late tonight and tomorrow. Previous discussion... Conditions this afternoon and evening look favorable for a significant severe weather event across the area. A deepening low pressure system over Lake Superior will track northeast into southern Quebec with its trailing cold front crossing the area during the mid afternoon through early evening period. The environment over the region will be favorable for the development of severe thunderstorms. Deep layer shear values range from 40-50 knots, 700mb flow is around 50 knots, low, level helicity is very significant and event is strongly forced by surface cold front/pre frontal trough. The surface based CAPE on the NAM ranges from 1500-2500 J/KG although the GFS is lower. The only lacking ingredient is steep mid level lapse rates but this will likely be overcome by the strong forcing. Due to strong mid level flow the primary threat will be damaging winds although if the NAM CAPE is realized large hail is also possible. The significant low level helicity is also an indication of tornado threat. Atmosphere ahead of this boundary will be very juicy with PWATs close to 2 inches, so any thunderstorms will contain heavy downpours. The severe weather threat will end across the region during the mid evening hours. High temperatures will range in the lower to middle 80s and with dewpoints near 70 it will feel rather muggy. Wednesday will be much cooler and dry with lower humidities under brisk northwest flow. Highs will range in the lower to middle 70s. && .SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/... 430 AM Update... Sharp upper trough will pivot from upper Midwest through Great Lakes and Northeast, with mainly dry weather and cool temperatures. Cooling air aloft combined with diurnal heating could produce a few widely scattered showers Thursday, but moisture will be quite limited. Generally speaking, northwest flow will exist in the low levels with persistent cold air advection and a taste of Fall. Lower to mid 50s are expected for lows Wednesday night. Then after highs of upper 60s-mid 70s Thursday, lows of upper 40s-lower 50s are figured by dawn Friday. && .LONG TERM /FRIDAY THROUGH MONDAY/... 320 PM EDT Update... Updated with new WPC guidance... Minor changes were made from previous forecast... Anti-cyclonic flow over the northeast combined with amplified ridging over the western CONUS will result in quiet weather for the extended forecast. High pressure is expected to prevail over the region Friday and possibly linger through the weekend which will result in below seasonal temperatures. This pattern may prevail through the start of early next week. && .AVIATION /15Z TUESDAY THROUGH SATURDAY/... Dense fog will lift at KELM around 13Z. Otherwise VFR conditions will persist until the afternoon. A strong cold front will cross the region during the mid afternoon and early evening hours. Strong thunderstorms are likely along this boundary with severe thunderstorms a possibility. Included a four hour TEMPO group indicating this convection at all TAF sites which will generally occur between 19Z-24Z. Following this boundary widespread MVFR conditions will persist until late tonight when drier air works into the terminals. Winds becoming southwest this morning and increasing to 10-15 knots with gusts 15-25 knots. Overnight winds becoming westerly around 10 knots. Outlook... Wednesday through Saturday...Mainly VFR. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...JAB/RRM NEAR TERM...JAB/RRM SHORT TERM...MDP LONG TERM...KAH AVIATION...RRM
Hazardous Weather Outlook National Weather Service Binghamton NY 1226 PM EDT Tue Aug 22 2017 NYZ057-062-PAZ040-043-044-047-048-072-231630- Delaware-Sullivan-Northern Wayne-Wyoming-Lackawanna-Luzerne-Pike- Southern Wayne- 1226 PM EDT Tue Aug 22 2017 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This Afternoon and Tonight. ...Severe thunderstorms are likely this afternoon and evening... Thunderstorms are expected this afternoon and evening ahead of a cold front. The primary threat from these storms will be damaging winds although large hail and an isolated tornado is also possible. Heavy rain may also occur which could cause urban and poor drainage flooding along with isolated flash flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ009-015>018-022>025-036-037-044>046-055-056-PAZ038-039-231630- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Steuben- Schuyler-Chemung-Tompkins-Madison-Southern Oneida-Cortland-Chenango- Otsego-Tioga-Broome-Bradford-Susquehanna- 1226 PM EDT Tue Aug 22 2017 ...TORNADO WATCH 461 IN EFFECT UNTIL 9 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Tornado Watch. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Binghamton NY
245 PM EDT TUE AUG 22 2017
NYZ016>018-221915-
Onondaga NY-Southern Cayuga NY-Seneca NY-
245 PM EDT TUE AUG 22 2017
...STRONG THUNDERSTORM WILL AFFECT...NORTH CENTRAL SENECA...
NORTHWESTERN CAYUGA AND NORTHWESTERN ONONDAGA COUNTIES UNTIL 315 PM
EDT...
At 245 PM EDT, Doppler radar was tracking a strong thunderstorm near
Throopsville, or near Auburn, moving northeast at 45 mph.
Strong wind gusts will be possible with this storm.
Locations impacted include...
Onondaga, Syracuse, Auburn, Lysander, Van Buren, Baldwinsville,
Seneca Falls, Solvay, Sennett and Skaneateles.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with this storm, and may lead to
minor flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4299 7603 4287 7677 4302 7681 4303 7650
4310 7650 4311 7647 4313 7648 4322 7648
4323 7630 4320 7627 4322 7626 4324 7627
TIME...MOT...LOC 1845Z 244DEG 48KT 4297 7667
KAHThe Ft Drum radar (KTYX), 85 km away, was scanning. The volume nearest the first event began at 19:05 UTC.
14 thunderstorm wind, 2 tornado, 1 hail. Local standard time, as filed.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm developed over the area and produced golf ball sized hail.
A tornado briefly touched down along Parker Hill Road in Georgetown, NY. The tornado did extensive damage to a forest largely composed of Norway spruce and other softwood conifers. The tornado damage path was very narrow only being 30 yards wide. Maximum winds were estimated at 90 mph.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A tornado touched down in a field west of Mason Road in Brookfield|NY. The tornado knocked down a couple dozen trees, partially blew|roofs off two barns and ripped a roof off a greenhouse. One home|lost a few shingles. The tornado tracked east northeast and was on|the ground for a little less than one half mile. The width of the|tornado was about 150 yards. Maximum winds were estimated at 90 mph.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
A thunderstorm moved across the region and became severe. This thunderstorm produced a severe wind gust of 52 knots.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2017Every state in 2017This day in weather historyThe tornado archive for New York, 2017Warnings in New York, August 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 712302, 712303, 712304, 712305, 712306, 712307, 712308, 712309, 712301, 720915, 712310, 712311, 720917, 712314, 712315, 712317, 712316.