Thunderstorms formed along a stationary frontal boundary extending from northeastern Pennsylvania into eastern New York which brought localized flash flooding to the region.
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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.
Thunderstorms formed along a stationary frontal boundary extending from northeastern Pennsylvania into eastern New York which brought localized flash flooding to the region.
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 Sep 11, 2:18 AM EST, 1 hour 42 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 318 AM EDT Mon Sep 11 2023 .SYNOPSIS... Stationary front will slowly drift east today with high pressure building in this afternoon. This will bring a brief break to the unsettled weather this afternoon into tomorrow. A cold front will bring an additional round of showers and thunderstorms Tuesday night into Wednesday. && .NEAR TERM /THROUGH TUESDAY/... 305 AM Update: A stationary front remains over the region and a weak wave of low pressure moving north into the area is bringing widespread moderate to heavy rain showers early this morning. The front and main upper trough will finally push eastward today, allowing for a west to east drying trend through the day as high pressure builds in. At least some partial sunshine is expected this afternoon, along with highs in the lower to mid 70s. Dry weather is expected tonight with high pressure briefly in control. Patchy fog is expected overnight, especially in areas that have seen heavy rainfall early this morning. High pressure should hold through most of the day on Tuesday, but a cold front will be approaching from the west by tomorrow evening. At this time, it appears that most of the showers with this front will hold off until Tuesday night, but a few isolated showers may sneak in from the west during the late afternoon and evening. && .SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/... 315 AM Update... Made very minor changers to the forecast, with mostly the timing of more widespread shower activity occurs a bit later Tuesday night into early Wednesday morning. Previous Discussion... An Upper level low spins over the great lakes bringing in a surge of moisture to our region sometime Tuesday evening into Wednesday. This moisture is expected to combine with higher PWAT values extending into our area from the Gulf. This set up will kick off widespread showers and thunderstorms with the potential for seeing locally heavy rainfall in some areas. Flow is expected to be unidirectional through the cloud layer as front moves through increasing the potential for these showers and thunderstorms to train for a period of time. This combined with soil sensitivity leads to a possible concern for flash flooding. Although model soundings suggest the threat for severe storms is low at this time. Highs are expected to range in the mid 70s to low 80s during the day with lows returning to the upper 50s to low 60s at night. We remain under the influence of the upper level low on Wednesday with showers expecting to continue, but with the main thunder and heavy rain threat shifting eastward. West to northwest flow keeps temperatures on the cooler side. Highs are only expected to reach the upper 60s to low 70s across the region. Lows are expected to fall into the upper 40s to low 50s overnight. && .LONG TERM /THURSDAY THROUGH SUNDAY/... 315 AM Update... High pressure will start to build in on Thursday, but with the upper trough still in our vicinity, there may be a few showers that pop up around peak afternoon heating hours. Otherwise, high pressure will hold through the remainder of the period. Being this is day 7, will need to watch how this progresses this week, as Hurricane Lee come in a little closer than currently forecast. Previous Discussion... Upper level low continues to rotate over the Great Lakes on Thursday before lifting out. This sends another short wave to our region kicking off some diurnally driven showers especially in CNY. Despite this conditions should remain dry for most of the day with highs in the mid to upper 60s with lows in the mid to upper 40s. Once the low departs a broad high pressure is expected to settle in Thursday night. This allows quiet weather to embrace our region once again. High pressure conditions are expected to last into Sunday with models routing Hurricane Lee towards Nova Scotia. This tropical system is far enough eastward that peripheral impacts appear unlikely for our region. Under the ridge temperatures are expected to return to the upper 60s to low 70s with lows ranging in the upper 40s to low 50s overnight. && .AVIATION /07Z MONDAY THROUGH FRIDAY/... Stationary front continues to be draped over the region with more showers and thunderstorms coming through this morning. Also, widespread stratus will keep ceilings at least at MVFR through the morning with a few sites likely drop to IFR or worse. Later this afternoon, some drier air will push into the area and ceilings will lift by late afternoon/ early evening. Outlook... Tuesday...Tuesday morning MVFR/IFR restrictions in fog and stratus, otherwise VFR. Tuesday night through Wednesday...Showers likely and chance of thunderstorms with associated restrictions. Thursday...More restrictions possible in isolated showers. Friday...Mainly VFR. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...MPK NEAR TERM...MPK SHORT TERM...ES/MPK LONG TERM...ES/MPK AVIATION...MPK
Hazardous Weather Outlook National Weather Service Binghamton NY 331 AM EDT Mon Sep 11 2023 NYZ009-015>018-022>025-036-037-044>046-055>057-062-PAZ038>040-043- 044-047-048-072-120730- 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- 331 AM EDT Mon Sep 11 2023 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Today and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. More locally heavy rainfall is possible Tuesday night into Wednesday. Monitor the forecast for updates. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Preliminary Local Storm Report
National Weather Service Binghamton NY
249 AM EDT Mon Sep 11 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 AM Rain Tioga Terrace 42.06N 76.12W
09/11/2023 M2.50 inch Tioga NY Trained Spotter
Total of last few hours, most of it since 1
AM.
&&
MDPPreliminary Local Storm Report
National Weather Service Binghamton NY
302 AM EDT Mon Sep 11 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0303 AM Rain 5 SE Lounsberry 42.03N 76.26W
09/11/2023 M2.18 inch Tioga NY Mesonet
NY Mesonet site south of Owego.
&&
MDPThe Binghamton radar (KBGM), 69 km away, was scanning. The volume nearest the first event began at 08:59 UTC.
1 flash flood. Local standard time, as filed.
Bissell Road washed out in the Town of Franklin. Rushing water and boulders destroyed a culvert and the road covering.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2023Every state in 2023This day in weather historyWarnings in New York, September 2023
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: 1140889.