Showers and thunderstorms developed along a surface trough Friday afternoon across central New York and northeast Pennsylvania in an unstable atmosphere. These storms quickly moved eastward and developed into line of thunderstorms.
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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.
Showers and thunderstorms developed along a surface trough Friday afternoon across central New York and northeast Pennsylvania in an unstable atmosphere. These storms quickly moved eastward and developed into line of thunderstorms. Some of these thunderstorms became severe and produced large hail, damaging winds and even a tornado.
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 Jun 30, 10:22 AM EST, 2 hours 23 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 1122 AM EDT Fri Jun 30 2017 .SYNOPSIS... There will be increasing chances for showers and thunderstorms today through Saturday as multiple disturbances pass through the region, followed by a strong cold front. Some storms could contain gusty winds, hail, and locally heavy rainfall. The weather pattern should finally quiet down into early next week courtesy of high pressure. && .NEAR TERM /THROUGH TONIGHT/... Updated at 11 am. Current forecast appears to be on track. Satellite loops are showing a well-defined short wave moving east across western NY late this morning with scattered showers developing along the leading edge of the wave along with a few more showers back to the west over Lake Erie. Some solar heating has developed across central / eastern NY and northeast Pa with temperatures rising to the mid 70s to near 80 in many areas as of 11 am. Latest surface based CAPEs have risen to about 1000 J/kg but MLCAPEs are still below 500 J/kg, however with continued sunshine we are expecting MLCAPE values to rise to between 1000 to 1500 J/kg in many areas along and east of I-81 early this afternoon. High resolution models are in good agreement showing lots of convective development along the leading edge of the wave moving east across NY this afternoon. Mode is mostly discrete storms and with 40 kt deep layer bulk shears we can't rule out a few supercells across our area this afternoon with severe wind and hail both possible. Localized heavy rain will also be a threat with plenty of moisture evident based on dew points in the mid to upper 60s and pwat values forecast above 1.5 inches. High resolution models are also forecasting some fairly significant areas of substantial updraft helicity mainly over central NY this afternoon which is often a good indicator for severe potential. Overall the SPC slight risk for much of our area looks reasonable with significant convection likely developing shortly after noon. Previous discussion is below. 3 AM Update... Severe weather potential will be the primary concern for the near term period. While chances will be somewhat higher in Central New York, the whole area in general will have at least some potential for isolated to scattered severe thunderstorms. Surface warm front has settled northward, now positioned from Central Ontario to the Adirondacks. We will spend today in the warm sector, with weak forcing yet also significantly more instability compared to Thursday. Convection will be reliant on shortwaves embedded within brisk west-southwest flow aloft. Models are in fair agreement on a stronger one of these waves carrying west-to-east across the region early-to-mid afternoon. This wave as of 3 AM is located along the Indiana-Ohio border, however, positive vorticity advection is has also managed to develop a wing of convection over Lake Erie. Evolution today will be complicated because of the multiple ripples in the flow aloft, and due to anticipated mesoscale boundaries from existing and developing thunderstorm clusters. Thus it is hard to rule out convection at any time today, though I place the highest likelihood on the main wave that passes through 16Z-21Z. During that time, in large part due to dewpoints rising into the mid-upper 60s and temperatures reaching upper 70s-mid 80s, convective available potential energy appears probable to reach between 1000-1500 J/KG; plenty adequate for thunderstorms. Severe weather parameters, especially in terms of shear, are somewhat stronger in Central New York and thus that is where the better chances for gusty winds will exist. However, areawide, the strongest cells could contain brief damaging winds. Hail is a lesser yet not negligible threat, as well as locally heavy rainfall from precipitable water values getting to around 1.7 inches or so. Our local severe thunderstorm checklist/analog tool returns events with primarily damaging winds, but only sporadic hail. Ridging occurs between waves this evening. Showers and thunderstorms cannot be ruled completely out tonight, due to unknown/unresolved small ripples aloft and interactions from earlier convection, but overall it appears that there will be a relative lull in activity tonight. It will however be rather muggy, with lows in the mid to upper 60s, almost matching dewpoints that will reside over the area. && .SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/... 3 AM Update...Active pattern continues with Saturday setting up to be a potentially interesting day. During the day a low pressure system will track from northern Ontario into Quebec which will drag a cold front across the area west to east during the afternoon into the early evening. This front coupled with daytime instability and a series of waves aloft moving around the upper trough will act to spark widespread showers and storms across the region during the afternoon. The potential for severe weather looks increasingly favorable and the Storm Prediction Center has upgraded the entire area to a Slight Risk. The very warm and muggy airmass with temps in the 80s will result in ML CAPE values reaching the 1000-2000 j/kg range with 0-1/0-3/0-6 km bulk shear values indicated to be 15/25/35 knots respectively. The upper forcing / height falls will also be more favorable than Friday. The upshot is that storms Saturday will have the potential of being strong to severe with damaging winds being the biggest threat but also the potential for large hail. Storms will also be capable of producing very heavy rain as PWATs will be near 1.8 inches so flash flood threat will have to be monitored as well. Storms will likely continue into Saturday evening, especially east of I-81 before moving out overnight with the passage of the cold front. This will begin to usher in somewhat cooler and drier air by Sunday morning with lows in the mid 60s. For Sunday, overall it will be a mostly dry day behind the front however since the upper level trough will still be over the area the cool air aloft with this feature coupled with weak waves moving through and daytime heating will trigger some scattered to isolated showers with even a few storms possible. Highs will be mostly in the low to mid 80s with lower humidity levels than Saturday...dew points generally in the low 60s which isn't too bad for this time of year. Any showers diminish Sunday night with a cooler night on tap as cool advection continues across the area behind the departing low pressure system over eastern Canada. Lows will be mostly in the upper 50s to low 60s. && .LONG TERM /MONDAY THROUGH THURSDAY/... 3 AM Update...A reprieve from the unsettled pattern is progged for the beginning of next week as the persistent upper level trough moves out giving way to a more zonal flow. For Monday, one final wave aloft will move through which could spark a few showers but not looking at an all day rain as conditions will generally feature a mix of sun and clouds with seasonal temperatures. By Tuesday, the upper trough will be off to the east with surface high pressure dominating bringing sunshine with seasonal temperatures and comfortable humidity levels. Beyond Tuesday, some uncertainty as the ECMWF brings in the next wave aloft with showers by Wednesday while the GFS and GEM keep conditions mainly dry through Wednesday with showers not returning until Thursday. In any event, at this point the trend looks to be back toward unsettled weather by for the end of next week as the next upper level trough moves in. && .AVIATION /15Z FRIDAY THROUGH TUESDAY/... Though mainly VFR conditions are figured for today through this evening, clusters of showers and thunderstorms are expected to carry across the region. Confidence has increased on a main wave that will provide a focused primary time for thunderstorms, so TEMPO CB groups were added to the terminals accordingly early to mid afternoon; mid to late afternoon for KAVP. Also, a wing of showers will skim by KSYR 14Z-17Z; watch for amendments in case confidence in thunder increases with this first batch. And generally speaking, storm cluster timing will be somewhat uncertain due to complex interactions, so monitor all terminals for amendments. Late tonight, MVFR cigs will form for several terminals, including probably fuel alternate at KBGM. Winds become south-southwest today around 7-10 knots with gusts 14-18 knots, before becoming light south or variable tonight. However, storms could contain stronger gusts. Outlook... Saturday morning through Saturday evening...Restrictions likely in showers/thunderstorms as front moves through area. Late Saturday night through Sunday...Mainly VFR but still a small chance for showers-thunder and associated restrictions. Sunday night through Tuesday...Quieter weather but with a small chance of afternoon showers and associated restrictions. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...MDP NEAR TERM...MDP/MSE SHORT TERM...PCF LONG TERM...PCF AVIATION...MDP
Hazardous Weather Outlook National Weather Service Binghamton NY 243 AM EDT Fri Jun 30 2017 NYZ009-015>018-022>025-036-037-044>046-055>057-062-PAZ038>040-043- 044-047-048-072-010645- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Steuben- Schuyler-Chemung-Tompkins-Madison-Southern Oneida-Cortland-Chenango- Otsego-Tioga-Broome-Delaware-Sullivan-Bradford-Susquehanna- Northern Wayne-Wyoming-Lackawanna-Luzerne-Pike-Southern Wayne- 243 AM EDT Fri Jun 30 2017 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Today and Tonight. ...SEVERE THUNDERSTORMS POSSIBLE TODAY... Scattered thunderstorms are expected to develop in our region today. Some storms may become severe with damaging winds. Locally heavy rain, and isolated hail, are also possible. Chances will be higher in Central New York compared to Northeast Pennsylvania. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Chances for severe thunderstorms will be a bit higher on Saturday, and areawide, as a strong cold front moves into the region. The primary threat will be for damaging winds, though large hail and perhaps even an isolated tornado cannot be ruled out. Heavy rainfall will be possible as well. Hazardous weather is not expected at this time for Sunday through Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today and again Saturday.
Special Weather Statement
National Weather Service Binghamton NY
130 PM EDT FRI JUN 30 2017
NYZ009-018-036-037-044>046-301815-
Otsego NY-Onondaga NY-Chenango NY-Southern Oneida NY-Cortland NY-
Madison NY-Northern Oneida NY-
130 PM EDT FRI JUN 30 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT...ONEIDA...WESTERN
OTSEGO...MADISON...EASTERN CORTLAND...EASTERN ONONDAGA AND CHENANGO
COUNTIES UNTIL 215 PM EDT...
At 130 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles southwest of Camden to near Willet.
Movement was east at 30 mph.
Dime size hail and wind gusts up to 50 mph will be possible with
these storms.
Strong thunderstorms will be near...
Camden and Sylvan Beach around 140 PM EDT.
Vienna around 145 PM EDT.
Blossvale around 150 PM EDT.
Lee and Oxford around 155 PM EDT.
Norwich and North Norwich around 205 PM EDT.
Delta Lake around 210 PM EDT.
Rome and Steuben around 215 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with these storms, and may lead to
minor flooding. Do not drive your vehicle through flooded roadways.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4339 7517 4310 7518 4305 7522 4290 7520
4287 7521 4285 7518 4240 7519 4241 7607
4324 7612 4320 7608 4320 7605 4318 7601
4318 7594 4315 7589 4328 7587 4333 7588
4335 7587
TIME...MOT...LOC 1730Z 258DEG 26KT 4328 7585 4246 7585
DJNSpecial Weather Statement
National Weather Service Binghamton NY
136 PM EDT FRI JUN 30 2017
PAZ043-044-047-301800-
Wyoming PA-Luzerne PA-Lackawanna PA-
136 PM EDT FRI JUN 30 2017
...STRONG THUNDERSTORM WILL AFFECT...NORTHWESTERN LACKAWANNA...
NORTHWESTERN LUZERNE AND WYOMING COUNTIES UNTIL 200 PM EDT...
At 135 PM EDT, Doppler radar was tracking a strong thunderstorm over
Noxen, or 9 miles southwest of Tunkhannock, moving east at 35 mph.
Half inch hail and wind gusts up to 50 mph will be possible with this
storm.
This strong thunderstorm will be near...
Mehoopany around 140 PM EDT.
Evans Falls and Beaumont around 145 PM EDT.
Tunkhannock around 150 PM EDT.
Falls and Osterhout around 155 PM EDT.
Clarks Summit and Clarks Green around 200 PM EDT.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
LAT...LON 4130 7631 4153 7622 4165 7589 4164 7571
4144 7565
TIME...MOT...LOC 1735Z 253DEG 29KT 4146 7609
DJNThe Binghamton radar (KBGM), 41 km away, was scanning. The volume nearest the first event began at 17:46 UTC.
4 thunderstorm wind, 1 tornado. 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. This storm also knocked over trees and wires in the towns of Preston, Pharsalia and Willet.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees which blocked a roadway.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over several trees and branches.
A tornado touched down at 445 pm EDT June 30th 2017 near the intersection of Fox Road and Route 365 several miles southwest of Verona, NY in Oneida County. The tornado knocked down around a dozen trees and several power poles along its 1.5 mile path. There were a few homes that sustained damage from trees falling and also loss of a few shingles. Maximum winds were around 70 mph with the worst damage along Route 365 between Fox Road and Stoney Brook Road.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over multiple trees and wires. This thunderstorm created damage to the siding on a roof and a door.
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, June 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: 710336, 710338, 710340, 709654, 710342.