A cold front swept through Central New York with multiple storms forming along it. Many storms became severe due to instability ahead of the front, resulting in multiple reports of trees and wires down.
Every event with a place to put it. Tap one for its entry below.
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 cold front swept through Central New York with multiple storms forming along it. Many storms became severe due to instability ahead of the front, resulting in multiple reports of trees and wires down. A mesonet stations measured a wind gust of 51 knots as a storm passed overhead.
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 Jul 27, 12:44 PM EST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 144 PM EDT Tue Jul 27 2021 .SYNOPSIS... A cold front will cross Lake Ontario this afternoon and push thunderstorms across NY and PA through the early evening hours. A few storms may include gusty winds. Wednesday will be quieter, with a chance for an isolated shower. Another round of storms will move through the region on Thursday. && .NEAR TERM /THROUGH WEDNESDAY/... 1230 PM Update... Most of the area remains sunny and dry so far, but clouds are starting to spill into our northwestern zones ahead of an approaching shortwave. A few storms are grazing Oneida and Onondaga counties out ahead of the main area of showers and storms that is finally tracking into western NY now with the approaching cold front. With plenty of sunshine, we have been able to destabilize quite quickly, with already up to 1000 j/kg of CAPE analyzed across most of the area, so some storms already in the area may turn stronger. Instability will continue to build ahead of the front, with CAPE values in the 1000-1500 j/kg range from the Finger Lakes into the Northern Tier of PA. With bulk shear up to 30 to 45kts, the brunt of the convection moving in over the next couple of hours will likely feature some strong to severe wind gusts that could generate some wind damage. Additionally, given how sensitive we are to any rainfall, any places that can see multiple rounds of storms may experience localized flooding issues. However, storms are moving quite quickly, so this is looking to be quite isolated. Storms should largely be wrapping up by 0Z, and temperatures will quickly fall through the 70s and 60s behind the front through the late afternoon and evening. We should continue to drop back into the 50s overnight. With an upper level trough in place, we can't rule out isolated shower activity on Wednesday. A thunderstorm could also pop up over NEPA, where the models are forecasting a narrow area of instability. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/... Clouds increase ahead Wednesday night of weak frontal boundary will push through the region Thursday. This front should provide just enough lift and moisture for a few showers and perhaps a thunderstorm or two. However, deeper moisture and instability will be confined to areas south of the cold front portion of the boundary across the southern Great Lakes. This will keep coverage and intensity of the precipitation down and limit the potential for any strong to severe thunderstorms. Still low level lapse rates should steepen enough to where a gusty storm or two can not be ruled out. Fairly fast storm motions and lower PW values compared to recent heavier rainfall events in the past month too. Highs should make it to around 80 after starting around 60 depending on clouds and precipitation Thursday afternoon. Our first potential lake effect shower chance of the season Thursday night into Friday with northwest flow and warm lake water. At the very least, clouds will likely be much more stubborn to hang on than model guidance indicates into a good chunk of Friday. Temperatures in the 60's and 70's due to plenty of cloud cover. && .LONG TERM /FRIDAY NIGHT THROUGH MONDAY/... High pressure then builds into the region Friday night through Saturday night. Clear skies and light winds may very well lead to favorable radiational cooling Saturday night with a few indications of upper 40's in a few spots. With full sunshine temperatures should get into the 70's making for a great weather start to the weekend. A bit warmer Saturday night compared to Friday night due to southwesterly flow ahead of the next frontal boundary. Another weak frontal boundary looks to pass through on Sunday. Deep moisture and instability are modeled to be lacking once again with the front only providing enough lift for scattered showers and perhaps a thunderstorm with light QPF. This front moves southeast of the region by Monday though as usual some timing uncertainty is present within the ensembles. Highs in the 70's with lows in the 50's. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... A line of showers and thunderstorms is beginning to sweep through the area this afternoon, bringing a chance for gusty winds and lightning, as well as MVFR or IFR visibility. This will first pass through KSYR between 18Z and 21Z, then through KRME and KITH between 19Z and 22Z. KELM, KBGM, and KAVP may see storms from 20Z to 24Z. After the storms move through, clouds will lower to between 1500 and 3000 feet across our NY terminals through the first half of the night, with IFR ceilings likely at KBGM and KELM after midnight. Minor visibility restrictions are expected, especially where any rain can fall earlier in the day, and as winds turn calm, IFR fog will become possible at KELM. A gradual improvement back to VFR is expected after sunrise. Outlook... Wednesday afternoon through Wednesday night...Mainly VFR. Thursday through Friday...Scattered showers/thunderstorms and associated restrictions possible, especially the afternoons. Friday night through Saturday...Mainly VFR. Sunday...Stray showers and thunderstorms possible, otherwise mainly VFR. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...DJP NEAR TERM...DJP/HLC SHORT TERM...MWG LONG TERM...MWG AVIATION...HLC
Hazardous Weather Outlook National Weather Service Binghamton NY 1115 AM EDT Tue Jul 27 2021 NYZ062-PAZ040-043-044-047-048-072-281515- Sullivan-Northern Wayne-Wyoming-Lackawanna-Luzerne-Pike- Southern Wayne- 1115 AM EDT Tue Jul 27 2021 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and tonight. A marginal risk for severe thunderstorms exists this afternoon and evening. An area of thunderstorms will move into the region this afternoon. A few storms will produce damaging wind gusts and brief downpours. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about severe weather to the NWS while following local, state and CDC guidelines. NYZ009-015>018-022>025-036-037-044>046-055>057-PAZ038-039-281515- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Steuben- Schuyler-Chemung-Tompkins-Madison-Southern Oneida-Cortland-Chenango- Otsego-Tioga-Broome-Delaware-Bradford-Susquehanna- 1115 AM EDT Tue Jul 27 2021 ...SEVERE THUNDERSTORM WATCH 395 IN EFFECT UNTIL 6 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. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about severe weather to the NWS while following local, state and CDC guidelines.
Special Weather Statement
National Weather Service Binghamton NY
1246 PM EDT Tue Jul 27 2021
NYZ017-018-044-271715-
Onondaga-Cortland-Southern Cayuga-
1246 PM EDT Tue Jul 27 2021
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN CAYUGA...NORTH
CENTRAL CORTLAND AND SOUTHERN ONONDAGA COUNTIES...
At 1246 PM EDT, a strong thunderstorm was located over Skaneateles,
or 8 miles east of Auburn, moving southeast at 40 mph.
Winds in excess of 30 mph and half inch hail are possible with this
storm.
Locations impacted include...
Onondaga, Syracuse, Auburn, Pompey, Otisco, Skaneateles, Marcellus,
Preble, Jordan and Camillus.
Heavy rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
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 4293 7591 4286 7590 4268 7602 4292 7656
4308 7646
TIME...MOT...LOC 1646Z 295DEG 35KT 4297 7641
TACSpecial Weather Statement
National Weather Service Binghamton NY
208 PM EDT Tue Jul 27 2021
NYZ022>024-271845-
Steuben-Chemung-Schuyler-
208 PM EDT Tue Jul 27 2021
...A STRONG THUNDERSTORM WILL AFFECT SCHUYLER...NORTHWESTERN CHEMUNG
AND NORTHEASTERN STEUBEN COUNTIES...
At 208 PM EDT, a strong thunderstorm was located over Hammondsport,
or 13 miles southwest of Dundee, moving southeast at 40 mph.
Winds in excess of 30 mph and half inch hail are possible with this
storm.
Locations impacted include...
Horseheads, Urbana, Watkins Glen, Catharine, Montour Falls, Hornby,
Tyrone, Wayne, Bradford and Hammondsport.
Heavy rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
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 4254 7725 4251 7715 4249 7714 4250 7712
4250 7710 4249 7710 4249 7705 4239 7668
4234 7669 4214 7682 4238 7734
TIME...MOT...LOC 1808Z 295DEG 35KT 4243 7721
TACThe Binghamton radar (KBGM), 105 km away, was scanning. The volume nearest the first event began at 18:14 UTC.
18 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm winds knocked down a tree onto a residence.
Strong thunderstorm winds gusted to 51 knots as measured by a mesonet station.
Strong thunderstorm winds knocked down a tree onto a roadway.
Strong thunderstorm winds knocked down a tree and wires in front of an entry way of a residence.
Strong thunderstorm winds knocked down utility poles and wires down onto the roadway.
Strong thunderstorm winds knocked down wires.
Strong thunderstorm winds knocked down a tree and wires onto a roadway.
Strong thunderstorm winds snapped large tree limbs.
Strong thunderstorm winds knocked down a tree.
Stong thunderstorm winds knocked down a tree and wires onto a house.
Strong thunderstorm winds knocked down a tree onto a roadway.
Strong thunderstorm winds knocked down a tree onto a porch.
Strong thunderstorm winds knocked down a tree onto a house.
Strong thunderstorm winds knocked down trees and wires.
Strong thunderstorm winds knocked down multiple trees and wires along RT 93 near the Crystal Lake Wild Forest area.
Strong thunderstorm winds knocked down a tree and wires.
Strong thunderstorm winds knocked down a tree and wires.
Strong thunderstorm winds knocked down a tree and wires.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2021Every state in 2021This day in weather historyWarnings in New York, July 2021
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: 973237, 974016, 973240, 973238, 973239, 973241, 973242, 973244, 973246, 973243, 973245, 973247, 973248, 974009, 974012, 974013, 974014, 974015.