An upper level wave dropped down into north-central New York during the evening of the 27th. This sparked an isolated severe thunderstorm that moved through Madison County and produced wind damage.
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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.
An upper level wave dropped down into north-central New York during the evening of the 27th. This sparked an isolated severe thunderstorm that moved through Madison County and produced wind damage.
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 27, 6:36 PM EST, 22 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 736 PM EDT Sat Jun 27 2020 .SYNOPSIS... Scattered showers and possibly a thunderstorm are expected this evening. A few storms could be strong to severe with damaging winds in central NY. An upper level trough will settle over the northeast U.S and keep afternoon showers and isolated thunderstorms in the forecast Sunday through Wednesday. && .NEAR TERM /THROUGH SUNDAY/... 6 pm update... Minor changes. The threat of thunderstorms has shifted as the showers moved southeast out of northeast PA. Thunderstorms are now in the Syracuse area moving southeast. This cluster should be out of the area by midnight. So far slow increases in intensity as it moves into better instability. Late tonight will probably will need to add patchy fog with all the rain that fell today. previous discussion... Radar and surface analysis shows a small mesolow near Waverly NY heading east-southeast into northeast PA. A weak boundary has set up across the northern tier counties of PA with upper 60s dewpoints to the south and mainly mid 60s dewpoints to the north across most of central NY. As this feature continues to push southeast it will interact with this boundary and tap into mixed layer CAPEs of between 500 and 1000 J/kg. 0-6 km shear vectors were from the west- northwest around 35 knots. Both shear and CAPE were on the marginal side for severe thunderstorms but we do feel that scattered to numerous thunderstorms will form in northeast PA between 18z and 20z and quickly move east of our forecast area by evening. CAMs all indicate some sort of convective development in northeast PA in the 18z-20z timeframe, exiting northeast PA/Sullivan Co. NY by 21z or so. Water vapor imagery shows an upper level wave heading southeast from the upper Great Lakes Region. This wave will move into northern NY by 00z. Model sounding data from the NAM has mixed layer CAPEs of almost 1000 J/kg with 0-6 km bulk shear around 35 knots at KSYR. The GFS has 625 J/kg and 40 knots of 0-6 km shear around 00z. CAMs models shows some convection in north central NY this evening so have POPs up there. We didn't enhance wording in forecasts but wouldn't be surprised if there were a few strong and maybe even severe thunderstorms in north central NY this evening. This activity will end overnight as the wave passes and the instability wanes. Then on Sunday, another upper level short wave will drop southeast into NY and PA between 15z and 18z from Canada. This feature will run into an increasing unstable air mass as it works toward the southern tier of NY and northeast PA around mid-day. Model soundings have mixed layer CAPEs 1000 TO 1700 J/KG on the NAM in northeast PA and around 1000 J/kg on the GFS. Bulk shear is around 35 knots or so. Farther north, instabilities were less and by the time you reach north central NY CAPEs were under 500 J/kg. We have scattered thunderstorms developing and increasing in coverage during the day as they move toward northeast PA. We have mentioned severe potential in HWO for the southern tier of NY to northeast PA in HWO for Sunday. Farther north, the timing of this next short wave is too early for enough instability to build with the daytime heating. Once this wave passes a low-level ridge of high pressure will build in across western NY to Ohio with northeast low-level flow and subsidence. Looks like activity will be well southeast of our area Sunday night so we don't have any POPs Sunday night. && .SHORT TERM /SUNDAY NIGHT THROUGH MONDAY NIGHT/... An upper level low dropping into New England will touch off a chance for showers and thunderstorms during the afternoon and evening hours for both Monday and Tuesday, with the best chance over our eastern zones given the proximity to this feature as well as potential terrain enhancement over the Catskills. However, dry northwesterly flow should help to keep activity fairly limited regardless, and our rain chances tapers down each night with the loss of diurnal heating. Otherwise, temperatures will be more or less seasonal with highs in the upper 70s to lower 80s and lows in the upper 50s and lower 60s Monday night. && .LONG TERM /TUESDAY THROUGH SATURDAY/... No real changes to the long term have been made, with the area remaining under the control of the upper level low over the area Wednesday gradually moving southward and finally offshore through the remainder of the forecast period. Previous Discussion Below... Upper low will slowly fill and meander south through the long term, ending up off the coast of VA by Friday. This will continue to keep the chance of afternoon and evening showers and thunderstorms, forced by heating and aided by the cold pool aloft, through the period. Best chance will continue to be over the eastern zones, nearer the upper low. Working against the showers will be the continued advection of low level drier air from the northeast. This should limit the coverage of the convection to scattered or isolated cells. Temperatures will remain below normal through the period, especially in the eastern zones. && .AVIATION /00Z SUNDAY THROUGH THURSDAY/... 730 pm update... This evening a threat of restrictions for RME/SYR up to 02z in showers and thunderstorms. Only a few showers around other sites. Late tonight starting around 06z cigs and vsbys fall to fuel alternate MVFR and at some sites IFR. Guidance showing ELM/BGM going to IFR from 9 to 13z in fog and stratus. All sites return to VFR around 15z. During the afternoon more and showers and possible thunderstorms most likely at AVP/BGM. Restrictions will be brief so did not include at this time. Winds westerly at 5 kts or less tonight. Sunday west winds at 5 shift to northwest in the afternoon at 7 kts. Outlook... Sunday Afternoon through Thursday...Still a chance for some isolated showers, mainly each afternoon, but mostly VFR conditions expected. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...DJN/TAC NEAR TERM...DJN/TAC SHORT TERM...HLC LONG TERM...MJM AVIATION...TAC
Hazardous Weather Outlook National Weather Service Binghamton NY 201 PM EDT Sat Jun 27 2020 NYZ062-PAZ043-044-047-048-072-281815- Sullivan-Wyoming-Lackawanna-Luzerne-Pike-Southern Wayne- 201 PM EDT Sat Jun 27 2020 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and Tonight. There is a slight risk of severe thunderstorms late this afternoon and early this evening. There is a potential for thunderstorms to have damaging winds and large hail. Stay tuned to NOAA weather radio or your local media outlets and listen for possible severe thunderstorm watches or warnings. .DAYS TWO THROUGH SEVEN...Sunday through Friday. There is a marginal risk for severe thunderstorms Sunday. Scattered thunderstorms are expected Sunday. An isolated storm or two may become severe with damaging winds and large hail. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about severe weather to the NWS while following local, state and CDC guidelines. NYZ022>025-055>057-PAZ038>040-281815- Steuben-Schuyler-Chemung-Tompkins-Tioga-Broome-Delaware-Bradford- Susquehanna-Northern Wayne- 201 PM EDT Sat Jun 27 2020 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and tonight. There is a chance for a strong thunderstorm this evening, otherwise widespread hazardous weather is not expected tonight. .DAYS TWO THROUGH SEVEN...Sunday through Friday. There is a marginal risk for severe thunderstorms Sunday. Scattered thunderstorms are expected Sunday. An isolated storm or two may become severe with damaging winds and large hail. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about severe weather to the NWS while following local, state and CDC guidelines. NYZ009-015>018-036-037-044>046-281815- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Madison- Southern Oneida-Cortland-Chenango-Otsego- 201 PM EDT Sat Jun 27 2020 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. There is a chance for a few strong to severe thunderstorms this evening. The primary threat will be gusty winds and hail. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please relay any information about severe weather to the NWS while following local, state and CDC guidelines. NICOSIA
Special Weather Statement
National Weather Service Binghamton NY
736 PM EDT Sat Jun 27 2020
NYZ018-036-037-280015-
Onondaga NY-Southern Oneida NY-Madison NY-
736 PM EDT Sat Jun 27 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT...SOUTHWESTERN
ONEIDA...NORTHWESTERN MADISON AND EAST CENTRAL ONONDAGA COUNTIES
UNTIL 815 PM EDT...
At 735 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Canastota to Lyndon. Movement was east at
25 mph.
Small hail and strong wind gusts will be possible with these storms.
Locations impacted include...
De Witt, Sullivan, Oneida, Lenox, Verona, Chittenango, Canastota,
Manlius, Fayetteville and Minoa.
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 4314 7546 4292 7571 4303 7610 4316 7591
4315 7587 4316 7585 4316 7579 4317 7577
4316 7575 4317 7574
TIME...MOT...LOC 2335Z 278DEG 20KT 4312 7584 4305 7601
BJGThe Binghamton radar (KBGM), 86 km away, was scanning. The volume nearest the first event began at 23:57 UTC.
2 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm winds caused roof and siding damage to a house, along with a dozen trees knocked down. The resident also found barn debris on property from upwind location on Cody Road.
Strong thunderstorm winds brought down several trees and caused minor damage to a couple of roofs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2020Every state in 2020This day in weather historyWarnings in New York, June 2020
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: 902029, 902030.