An upper-level low pressure system was the driving force of scattered storms across Northeast Pennsylvania. Warm and moist air contributed to several rounds of heavy rain producing thunderstorms over the northern tier counties.
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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 low pressure system was the driving force of scattered storms across Northeast Pennsylvania. Warm and moist air contributed to several rounds of heavy rain producing thunderstorms over the northern tier counties. Rainfall amounts in a short period of time totalled between 2 and 3 inches leading to localized flash flooding.
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 22, 1:30 PM EST, 3 hours earlier.
Area Forecast Discussion National Weather Service Binghamton NY 230 PM EDT Mon Jul 22 2024 .SYNOPSIS... An active weather pattern will continue into the middle of the work week with scattered showers and thunderstorms around each day. Conditions become drier and warmer later in the week and into the weekend as high pressure builds over the region. && .NEAR TERM /THROUGH TUESDAY NIGHT/... 230 PM Update... Storms developing across the Twin Tiers and NE PA will move generally east-northeastward now and through the evening hours. These storms and showers are developing in a moist environment, with PWAT values between 1.5 to 1.75 inches. Any of these storms and showers could produce heavy downpours, and could cause localized flash flooding. CAMs have generally sped up the timing, but they're still a couple hours behind with onset of storms. Additionally, storms aren't stalling too much, but there could be some backbuilding and training of storms and showers that could lead to localized flash flooding. From a shower that lasted about 20 minutes over the office, it produced almost a half inch of rainfall, providing confidence that these showers and storms are capable of producing a lot of rainfall in a short amount of time. Any storms will taper off after sunset, where showers will prevail into the early morning hours of Tuesday. Patchy fog will likely develop across the area after showers taper off, and lift soon after sunrise. For Tuesday, scattered storms expected in the afternoon, with temperatures in the low to mid 80s. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... For Wednesday, upper level trough will be moving into the Great Lakes region and becoming positively tilted as it runs into the large upper level anticyclone off the east coast. Since this trough is slow moving and the upper level ridge is holding steady, there will continue to be modest amounts of 0-6 km shear Wednesday. Bulk shear magnitudes are running around 30 knots Wednesday afternoon. ML CAPEs are projected to be 1000-1500 J/KG on the NAM12 in western and parts of central NY with lesser CAPE farther south and east. The GFS as usual has less CAPE under 1000 J/KG. CAMs for Wednesday are showing a batch of showers and a few storms skirting northeast PA in the morning with a possible MCV hence the lower CAPE. Scattered thunderstorms develop in the afternoon farther north into central NY as per CAMs. This goes along with a short wave riding northeast around the base of the Great Lakes Trough. I wouldn't be surprised if our area ends up in a marginal risk but it is indeed a "marginal" set up for severe at Day 3. Any convection that forms will last into the evening before tapering off overnight into Thursday morning. For Thursday, Great Lakes trough presses east and pushes a cold front through central NY during the late morning/early afternoon and northeast PA by evening. With the upper level trough really making a move to the east pressing more into the ridge aloft, bulk wind shear values between 0-6 km get up to over 40 knots. Instability will be modest with sfc based CAPEs at or above 1000 J/Kg. There is more uncertainity as to the timing with this front and how much instability will be available. But there is higher confidence in strong enough shear for severe thunderstorms. So for now we will have high POPs for showers and thunderstorms most of Thursday given uncertainty in timing of front. Then for Thursday night, cold front clears northeast PA as per GFS and Euro with high pressure building into the Great Lakes. The GFS is dry with the Euro showing some residual low-level moisture and a few showers. We will stick with NBM for now given uncertainities. The amount of rain as per Euro would be very light anyway. && .LONG TERM /FRIDAY THROUGH SUNDAY/... For Friday, high pressure builds across the region with northwest flow aloft downstream from an upper level ridge over the upper Midwest. This should lead to mostly dry conditions. Again the 00z Euro continues to hold onto low-level moisture Friday morning but again it would be light and spotty precipitation. For the weekend, high pressure builds in aloft above a surface high with fair weather and increasing temperatures. By Monday, models diverge some but overall it will be very warm and humid with a southerly flow in place. We will stick close to NBM for this period given model uncertainities. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... 120 PM Update... Scattered thunderstorms are beginning develop across the Twin Tiers and NE PA, and will continue to move in from south to north through the afternoon, with moderate to heavier rain showers moving through behind them. TEMPO groups have been added for storms; BGM, ELM, and AVP through 20Z, and the other NY terminals in the next few hours. Any thunderstorms can produce heavy rainfall, reducing vsbys to IFR or worse briefly. After the thunderstorms in the evening, it will taper off to showers, drizzle and patchy fog. CIGs lower to MVFR Fuel Alt or IFR for all terminals, except SYR and RME, who will only likely fall to MVFR. Outlook... Tuesday through Thursday...Several rounds of showers and thunderstorms with associated restrictions. Activity will generally be dependent on daytime heating, with best chances of rain and thunder during afternoon-evening hours. Friday...VFR conditions expected as high pressure builds in. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...DJN NEAR TERM...KL SHORT TERM...DJN LONG TERM...DJN AVIATION...KL
Hazardous Weather Outlook National Weather Service Binghamton NY 225 PM EDT Mon Jul 22 2024 NYZ009-015>018-023-025-036-037-044>046-231830- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Schuyler- Tompkins-Madison-Southern Oneida-Cortland-Chenango-Otsego- 225 PM EDT Mon Jul 22 2024 This Hazardous Weather Outlook is for central New York. .DAY ONE...This afternoon and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Scattered thunderstorms Tuesday through Thursday could produce locally heavy rainfall and/or gusty winds. A frontal passage on Thursday appears to be the best chance to see organized, stronger thunderstorms at this time. Continue to monitor the latest forecasts and outlooks as the details become more clear in the coming days. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ022-024-055>057-062-PAZ038>040-043-044-047-048-072-231830- Steuben-Chemung-Tioga-Broome-Delaware-Sullivan-Bradford-Susquehanna- Northern Wayne-Wyoming-Lackawanna-Luzerne-Pike-Southern Wayne- 225 PM EDT Mon Jul 22 2024 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and tonight. Scattered showers and slow moving thunderstorms could produce locally heavy downpours this afternoon into tonight. There is at least a marginal to slight risk for isolated instances of flash flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Scattered thunderstorms Tuesday through Thursday could produce locally heavy rainfall and/or gusty winds. A frontal passage on Thursday appears to be the best chance to see organized, stronger thunderstorms at this time. Continue to monitor the latest forecasts and outlooks as the details become more clear in the coming days. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Preliminary Local Storm Report
National Weather Service Binghamton NY
242 PM EDT Mon Jul 22 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0241 PM Rain NWS Binghamton 42.21N 75.99W
07/22/2024 M1.09 Inch Broome NY Official NWS Obs
1.09 inches of rain observed in 40 minutes.
&&Special Weather Statement
National Weather Service Binghamton NY
247 PM EDT Mon Jul 22 2024
NYZ044-045-221915-
Chenango NY-Cortland NY-
247 PM EDT Mon Jul 22 2024
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL CORTLAND AND
NORTHWESTERN CHENANGO COUNTIES THROUGH 315 PM EDT...
At 247 PM EDT, Doppler radar was tracking a strong thunderstorm over
Cincinnatus, or 9 miles east of Marathon, moving northeast at 25 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Plymouth, Cincinnatus, Otselic, Willet, Pitcher, Pharsalia, German,
Mc Donough, Bowman Lake State Park, and South Plymouth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4241 7586 4250 7594 4273 7579 4273 7573
4258 7554
TIME...MOT...LOC 1847Z 223DEG 20KT 4250 7586
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MWGSpecial Weather Statement
National Weather Service Binghamton NY
314 PM EDT Mon Jul 22 2024
NYZ036-045-221945-
Chenango NY-Madison NY-
314 PM EDT Mon Jul 22 2024
...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL MADISON AND
NORTHEASTERN CHENANGO COUNTIES THROUGH 345 PM EDT...
At 314 PM EDT, Doppler radar was tracking a strong thunderstorm over
Plymouth, or near Norwich, moving northeast at 25 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Plymouth, North Norwich, Sherburne, Columbus, Earlville, Smyrna,
Poolville, and South Plymouth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4269 7532 4267 7533 4266 7533 4254 7562
4262 7575 4283 7550 4273 7529
TIME...MOT...LOC 1914Z 222DEG 22KT 4262 7560
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MWGSpecial Weather Statement
National Weather Service Binghamton NY
329 PM EDT Mon Jul 22 2024
NYZ045-046-056-057-PAZ039-040-222015-
Otsego NY-Chenango NY-Broome NY-Delaware NY-Susquehanna PA-
Northern Wayne PA-
329 PM EDT Mon Jul 22 2024
...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN OTSEGO...
SOUTHEASTERN BROOME...NORTHWESTERN DELAWARE...SOUTHEASTERN
CHENANGO...NORTHEASTERN SUSQUEHANNA AND NORTHWESTERN WAYNE COUNTIES
THROUGH 415 PM EDT...
At 329 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bainbridge to near New Milford. Movement
was east at 20 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Kirkwood, Conklin, Sidney, Jackson, Guilford, Sanford, Susquehanna,
Deposit, Coventry, and Susquehanna Depot.
This includes the following highway exits...
New York Interstate 81 near 1.
Interstate 86/Route 17 between 78 and 84.
Interstate 88 between 5 and 12.
Pennsylvania Interstate 81 between 219 and 230.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Heavy rainfall is also occurring with these storms and may lead to
localized 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.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Binghamton.
&&
LAT...LON 4244 7513 4182 7552 4181 7591 4244 7564
TIME...MOT...LOC 1929Z 268DEG 16KT 4233 7546 4188 7579
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MWGSpecial Weather Statement
National Weather Service Binghamton NY
350 PM EDT Mon Jul 22 2024
NYZ016-023-025-222015-
Seneca NY-Schuyler NY-Tompkins NY-
350 PM EDT Mon Jul 22 2024
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN SENECA...CENTRAL
SCHUYLER AND NORTHWESTERN TOMPKINS COUNTIES THROUGH 415 PM EDT...
At 350 PM EDT, Doppler radar was tracking a strong thunderstorm over
Montour Falls, moving northeast at 40 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Hector, Covert, Watkins Glen, Trumansburg, Catharine, Montour Falls,
Interlaken, Odessa, Burdett, and Lodi.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4246 7691 4247 7689 4248 7690 4271 7678
4265 7667 4263 7667 4262 7663 4258 7655
4229 7677 4229 7682 4233 7698
TIME...MOT...LOC 1950Z 202DEG 34KT 4237 7683
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
MWGSpecial Weather Statement National Weather Service Binghamton NY 421 PM EDT Mon Jul 22 2024 NYZ009-018-022>025-036-037-044>046-055>057-062-PAZ038>040-043-044- 047-048-072-222230- Northern Oneida-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- 421 PM EDT Mon Jul 22 2024 * Scattered Thunderstorms * Scattered thunderstorms with locally heavy downpours and sub severe gusty winds will move northeast across central New York and northeastern Pennsylvania into the early evening. Ponding of water on roadways and a few downed tree branches are possible from these thunderstorms. MWG
The Binghamton radar (KBGM), 43 km away, was scanning. The volume nearest the first event began at 21:29 UTC.
1 flash flood. Local standard time, as filed.
Water is flowing over Route 467 in several locations along Johnson Creek.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2024Every state in 2024This day in weather historyWarnings in Pennsylvania, July 2024
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: 1205092.