A cold front moving through Northeast Pennsylvania sparked showers and thunderstorms during the afternoon of the 23rd. Some of these storms became severe and produced mainly tree damage in Susquehanna County.
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 moving through Northeast Pennsylvania sparked showers and thunderstorms during the afternoon of the 23rd. Some of these storms became severe and produced mainly tree damage in Susquehanna County.
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 23, 2:46 PM EST, 17 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 346 PM EDT Thu Jul 23 2020 .SYNOPSIS... A cold front moving southeast through New York northeast Pennsylvania will bring showers and thunderstorms to our area into this evening. High pressure will build into the region Friday, bringing dry weather that lasts into Sunday. && .NEAR TERM /THROUGH FRIDAY/... 345 PM Update... Severe Thunderstorm watch is now in effect for the eastern southern tier, western catskills and all of NE PA until 10 PM. Main concern in the near term continues to be the scattered strong to severe thunderstorms moving across the area through about 10PM this evening. Storms are also producing torrential downpours and urban/small stream flooding issues could occur. The weak surface front/wind shift boundary will slowly drift south through the area this evening bringing the convection with it. Showers and perhaps an embedded thunderstorm could linger longer across NE PA, perhaps even into the predawn hours. Otherwise, expect patchy fog to form overnight as it remains humid with lows in the 60s. Early morning fog and stratus clouds on Friday should break up, with skies becoming mostly sunny in the afternoon. Cannot rule out a stray shower across the higher elevations of the Poconos, otherwise dry weather. Surface dew points slowly fall into the upper 50s and lower 60s by afternoon. High temperatures will still be warm, reaching well into the 80s for most. High pressure brings mostly clear skies Friday night with areas of fog likely, especially in the valleys. A bit cooler with lows in the mid-50s to lower 60s. 1245 PM Update... Surface boundary is bisecting the area roughly along a line from Penn Yan to Utica. The thick cloud cover we had earlier this morning is now becoming broken cumulus across the region, which is allow for decent heating and destabilization. Noon temperatures are now mostly in the upper 70s to lower 80s areawide and surface dew points are still elevated between 68-72F. Meso analysis shows right around 1000 J/Kg of MLCAPE across all of CNY and NE PA at this time, with effective layer shear ranging from 30-40 kts. Storms are just beginning to develop along the boundary across Yates and Steuben County at this time. Expecting activity to become more numerous by mid to late afternoon across much of the region. New day 1 convective outlook from SPC has expanded the slight risk region back to Chemung county in the Twin Tiers and now covers all of our NE PA counties. SPC also lowered the threat, with no severe weather now expected northwest of a Seneca Falls---Syracuse--Rome line. 1040 AM Update... Cloud cover is slowly beginning to break up across the Finger Lakes and north-central NY this morning as drier mid level air works in from the northwest. This will allow more heating to take place over the next several hours, which will enhance instability. High dew points in the lower 70s will combine with temperatures in the low to mid-80s this afternoon to produce MLCAPE values between 1000-1500...and perhaps as high as 2000 J/kg across parts of NE PA. A shortwave disturbance currently across western NY will move into our region during the afternoon hours helping to enhance the effective layer shear...likely into the 25-35 kt range. Latest CAMS and radar trends are in good agreement that numerous showers and thunderstorms will develop across CNY midday or early afternoon and slowly drift south into the Southern Tier and then NE PA by late afternoon and early evening. Forecast soundings also show high values of DCAPE (around 1000-1200 J/Kg) and inverted V type soundings due to the aforementioned dry mid level air advection. Therefore, do think there is potential for a few storms to be strong to severe across the region this afternoon and evening. The most likely area to watch for severe storms and possible damaging winds will be the Twin Tiers, NE PA and western Catskills. Cannot rule out some hail in a few storms as well, considering high EL levels up to 45K ft agl and high levels of CAPE in the hail growth zone. PWATS remain high in the 1.6 to 1.8 inch range, and storms may train over the same locations as the front only very slowly drifts south this afternoon. Therefore, will also be watching for some storms to produce heavy downpours which could cause some localized ponding of water or other hydro issues. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY NIGHT/... 1130 am Update... Raised temperatures slightly Saturday with models trending towards a drier airmass in place. High pressure will still be in place into Monday. 350 AM Update... Ridging will build across the region through the weekend with humidity and heat on the rise again by Sunday. Surface high pressure will remain overhead through the period and the area should remain dry. && .LONG TERM /MONDAY THROUGH THURSDAY/... 315 pm Update... Lowered the PoPs Monday during the day as the front is trending slower and looking to be moving through Monday night into Tuesday. Previous Discussion... Ridging starts to break down Sunday night as a cold front drops out of Ontario, Canada. Shower and thunderstorm activity will increase through the day Monday with the approaching front. A moist and unstable airmass is expected out ahead of the front, with GEFS PWAT anomaly showing values around 2 standard deviations above normal. However, model consensus for the timing of the front is fairly early in the day on Monday, so unless the timing is pushed back until later in the day, the severe threat should be low. An upper trough will slowly push eastward and over the Northeast U.S. Conditions will likely remain unsettled through the remainder of the period under the influence of the upper trough, but the best instability exits with the cold front Monday night, so severe thunderstorm threat should be low. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... 130 PM Update... A surface front is just south of KSYR and KRME at 18z. KSYR and KRME should therefore be mainly dry over the next 24 hours. South of here, for the rest of the TAF sites, scattered showers and thunderstorms are now developing. These showers and storms could impact the TAF sites mainly between 18-22z this afternoon...except a little later perhaps lasting until 00z at KAVP. If these storms go over a terminal expect brief IFR vsby restrictions with heavy rain and gusty/erratic winds. Included a tempo group in the tafs to cover this potential. The showers should taper off and end after sunset for most locations. Then, with humid conditions lingering expect some lower MVFR stratus and patchy fog to develop overnight. Some uncertainty remains on just how restrictive this fog may be, especially for KELM. The stratus and valley fog should dissipate by mid-morning Friday, with conditions returning to VFR. West-southwest winds 5-10 kts this afternoon. Winds turn light northerly or variable overnight, less than 5 kts. Northerly winds continue into Friday, 5-10 kts. Outlook... Friday through Sunday Night...Mainly VFR. Early morning fog and associated restrictions possible, especially at KELM. Monday and Tuesday...Scattered showers and thunderstorms possible. May lead to some restrictions at times. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...TAC NEAR TERM...MJM SHORT TERM...AJG/MPK LONG TERM...AJG/MPK AVIATION...MJM
Hazardous Weather Outlook National Weather Service Binghamton NY 327 PM EDT Thu Jul 23 2020 NYZ015>018-022>025-036-037-044-241930- Yates-Seneca-Southern Cayuga-Onondaga-Steuben-Schuyler-Chemung- Tompkins-Madison-Southern Oneida-Cortland- 327 PM EDT Thu Jul 23 2020 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. There is a marginal risk for severe thunderstorms this evening. The main threats are isolated damaging winds, hail, and heavy rainfall. Be sure to check the latest forecast updates and have multiple ways to receive watches and warnings if severe weather approaches your location. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. 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. NYZ045-046-055>057-062-PAZ038>040-043-044-047-048-072-241930- Chenango-Otsego-Tioga-Broome-Delaware-Sullivan-Bradford-Susquehanna- Northern Wayne-Wyoming-Lackawanna-Luzerne-Pike-Southern Wayne- 327 PM EDT Thu Jul 23 2020 ...SEVERE THUNDERSTORM WATCH 396 IN EFFECT UNTIL 10 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. There is a slight risk for severe thunderstorms this evening. The main threats are isolated damaging winds, large hail, and heavy rainfall. Be sure to check the latest forecast updates and have multiple ways to receive watches and warnings if severe weather approaches your location. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a low probability for widespread hazardous weather. .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. NYZ009-241930- Northern Oneida- 327 PM EDT Thu Jul 23 2020 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
338 PM EDT THU JUL 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0320 PM TSTM WND DMG ENDICOTT 42.10N 76.06W
07/23/2020 BROOME NY 911 CALL CENTER
POWER LINE DOWN ON MILLS AVE.
&&
AJGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
348 PM EDT THU JUL 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0316 PM TSTM WND DMG UNION CENTER 42.15N 76.07W
07/23/2020 BROOME NY 911 CALL CENTER
TREE ON WIRES
&&
AJGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
351 PM EDT THU JUL 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0323 PM TSTM WND DMG CAMPVILLE 42.08N 76.15W
07/23/2020 TIOGA NY 911 CALL CENTER
WIRES DOWN ON ROAD ON CANTERBERRY DRIVE
&&
AJGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
355 PM EDT THU JUL 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0336 PM TSTM WND DMG BINGHAMTON 42.10N 75.91W
07/23/2020 BROOME NY 911 CALL CENTER
POLE AND WIRES DOWN ON CLINTON ST.
&&
AJGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
356 PM EDT THU JUL 23 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0326 PM TSTM WND DMG ENDICOTT 42.10N 76.06W
07/23/2020 BROOME NY 911 CALL CENTER
WIRES DOWN SPARKING ON TRUCK ON HAZEL AVE.
&&
AJGSpecial Weather Statement
National Weather Service Binghamton NY
402 PM EDT Thu Jul 23 2020
NYZ057-232100-
Delaware NY-
402 PM EDT Thu Jul 23 2020
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN DELAWARE COUNTY
UNTIL 500 PM EDT...
At 401 PM EDT, Doppler radar was tracking a strong thunderstorm over
Unadilla, or 12 miles northwest of Walton, moving east at 10 mph.
Wind gusts in excess of 40 mph and small hail will be possible with
this storm. Heavy downpours of rain are also possible.
Locations impacted include...
Walton, Colchester, Meredith, Franklin, Sidney Center, East Sidney,
Meridale and Youngs.
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.
Occasional cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
Additional statements will be issued as conditions warrant.
&&
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
central New York.
LAT...LON 4212 7504 4231 7538 4232 7538 4231 7534
4232 7531 4237 7526 4236 7524 4238 7520
4236 7519 4238 7514 4240 7512 4237 7492
TIME...MOT...LOC 2001Z 289DEG 8KT 4232 7528
ButtsThe Binghamton radar (KBGM), 33 km away, was scanning. The volume nearest the first event began at 20:03 UTC.
8 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm winds brought down a tree along with powerlines on Pine Street.
Strong thunderstorm winds brought down wires near intersection of Dubois Street and Steam Hollow Road.
Strong thunderstorm winds brought down ten trees in a yard.
Strong thunderstorm winds brought down a tree, which blocked a portion of 227 Interstate 81 Northbound.
Strong thunderstorm winds brought down trees near Irish Hill Road and Flynn Road.
Strong thunderstorm winds brought down a tree on a road.
Strong thunderstorm winds brought down a tree and wires, blocking Creek Road.
Strong thunderstorm winds brought down a tree on Route 374 near Interstate 81.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2020Every state in 2020This day in weather historyWarnings in Pennsylvania, July 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: 913160, 913161, 913165, 913162, 913164, 913166, 913167, 913168.