A cold front moved through the region the day before and in its wake was a much cooler atmosphere. The cool air aloft resulted in an unstable environment which caused showers and thunderstorms to develop over New York and Pennsylvania Tuesday afternoon.
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The episode as NWS BGM wrote it up.
A cold front moved through the region the day before and in its wake was a much cooler atmosphere. The cool air aloft resulted in an unstable environment which caused showers and thunderstorms to develop over New York and Pennsylvania Tuesday afternoon. An isolated thunderstorm became severe and produced strong winds and hail in Oneida County, New York.
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 20, 1:04 PM EST, 1 hour 7 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 204 PM EDT Tue Jun 20 2017 .SYNOPSIS... Temperatures will be slightly below normal for the next couple of days, with scattered showers and an isolated thunderstorm at times, mainly in Central New York. A frontal system will turn things a bit warmer later this week, yet it will also increase chances of showers and thunderstorms, especially on Friday. && .NEAR TERM /THROUGH WEDNESDAY/... 910 AM Update...Forecast on track with no major changes made. We are still only expecting isolated to scattered showers today mainly over central NY. 340 AM Update... While not as busy as the last couple of days, there will still be widely scattered showers and isolated thunderstorms in the near term period due to multiple weak waves passing through the region. Cold front cleared through the area on Monday, taking away the strong to severe thunderstorms as well as the very humid conditions. In its wake, a drier and cooler air mass will be in place today through Wednesday with dewpoints only the 50s most of the time. However, a broad upper low is centered in Quebec, with cyclonic flow around it across the Great Lakes to Northeast. This flow will contain several weak waves; one of which is moving through the region prior to dawn with showers. Some dry slotting will occur later today as flow flattens between waves, which will limit coverage of additional showers to mainly north of the Twin Tiers-Catskills. An isolated thunderstorm or two could also occur, with cool air aloft and diurnal heating from below producing steeper lapse rates. Highs today will be mainly 70s, though lower elevations of Susquehanna and Delaware Valleys in Northeast PA-Sullivan County NY could get near 80 degrees. Another wave will skim through the region overnight tonight. A few showers may result; again mainly in Central New York. Lows tonight will be generally in the 50s. With the cloudiness from the wave, and continued mixed atmosphere, valley fog does not look very probable. GFS-ECMWF models have shifted to bringing in left exit region of upper jet on Wednesday, coinciding with diurnal heating. NAM- GEM models are more reluctant and/or delayed with this. I felt it prudent enough to add in at least a small chance of showers and isolated thunder areawide, though any resulting activity should be quite light and it will be dry most of the time. Highs again will be lower-mid 70s for Central NY, and mid 70s-near 80 in Northeast PA. && .SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY/... 230 AM update... Transition period and drier as upper level trough moves east. Weak high pressure at the surface Wednesday night with lows from around 50 to the mid 50s. Brief dry period. Thursday a broad upper level trough is over the area. Warm and moist air moves in from the west southwest with a warm front. Slight chance of a shower or thunderstorm mostly in New York and during the afternoon. Highs 75 to low 80s. Dewpoints creep back to around 60. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... 230 am update... Minor changes. General theme the same. Warmer and wet Friday then showery and cooler rest of period. previous discussion... Period begins with a zonal upper level flow then late in the period another upper level trough will make its way through the Great Lakes region and into the northeast. Thursday night and Friday, low pressure moving through eastern Canada will drag a warm front through the region followed by the trailing cold front. Will continue with chance pops Thursday night and likely most places on Friday. Friday night through Saturday night, system moves east of area with region primarily dry but still can't rule out the chance for a shower or thunderstorm. Sunday and Sunday night, upper level trough and associated front will bring high pops again for showers or thunderstorms. Monday looks mainly dry as front is well east of region. Temperatures will run slightly above normal Friday and Saturday then cool to near seasonal normals late in the period. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... An upper level trough will persist across the region through the TAF period. Due to weak disturbances pivoting through this trough, a brief restriction is not totally out of the question from scattered passing showers and an isolated thunderstorm across the NY terminals this afternoon, and again overnight tonight. That being said, VFR conditions will be dominant through 18Z Wednesday, and confidence in rain/restrictions at any one terminal is not high enough to include specifically in the TAF. West-southwest winds continue at 10-15 knots gusting up to 20 knots this afternoon before diminishing this evening and becoming more variable. Outlook... Wednesday...Mainly VFR but slight chance of a few showers/storms with brief restriction possible. Wednesday night-early Thursday...VFR except fog possible KELM. Late Thursday through Friday night...Showers and chance of thunderstorms, especially Friday, with associated restrictions. Saturday - Sunday...VFR but shower/storm and brief restriction possible. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...MDP NEAR TERM...MDP/PCF SHORT TERM...TAC LONG TERM...RRM/TAC AVIATION...MDP
Hazardous Weather Outlook National Weather Service Binghamton NY 324 AM EDT Tue Jun 20 2017 NYZ009-015>018-022>025-036-037-044>046-055>057-062-PAZ038>040-043- 044-047-048-072-210730- 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- 324 AM EDT Tue Jun 20 2017 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .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
300 PM EDT TUE JUN 20 2017
NYZ037-201930-
Southern Oneida NY-
300 PM EDT TUE JUN 20 2017
...STRONG THUNDERSTORM WILL AFFECT...EAST CENTRAL ONEIDA COUNTY UNTIL
330 PM EDT...
At 300 PM EDT, Doppler radar was tracking a strong thunderstorm over
Rome, moving east at 40 mph.
Half inch hail and strong wind gusts will be possible with this
storm.
Locations impacted include...
Utica, Rome, Trenton, Deerfield, Floyd, Whitesboro, New York Mills,
Yorkville, Oriskany and Holland Patent.
LAT...LON 4328 7515 4325 7515 4326 7514 4324 7512
4323 7507 4314 7514 4308 7520 4317 7560
4330 7557 4330 7537
TIME...MOT...LOC 1900Z 279DEG 34KT 4323 7552
RRMThe Ft Drum radar (KTYX), 63 km away, was scanning. The volume nearest the first event began at 19:11 UTC.
1 thunderstorm wind. Local standard time, as filed.
A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and dime sized hail.
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 historyWarnings 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: 710325.