Thunderstorms once again formed along a stationary frontal boundary positioned over northeastern Pennsylvania and brought localized flash flooding to the region.
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The episode as NWS BGM wrote it up.
Thunderstorms once again formed along a stationary frontal boundary positioned over northeastern Pennsylvania and 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, 12:29 AM EST, 1 minute earlier.
Area Forecast Discussion National Weather Service Binghamton NY 129 AM EDT Mon Sep 11 2023 .SYNOPSIS... Another round of showers and some thunderstorms is expected through this evening, along with locally heavy rainfall. A brief break to the unsettled weather is expected late Monday into Tuesday. A cold front will bring an additional round of showers and thunderstorms late Tuesday into Wednesday. && .NEAR TERM /THROUGH TODAY/... 810 PM Update: Very messy pattern at the surface, with a diffuse stationary front still in place across Central NY into western PA, and an area of low-level (850-700mb) moisture convergence draped along the coastal plain from northern NJ into the Delmarva. Precip coverage should slowly expand over the next few hours as a shortwave trough over WV slowly ejects to the northeast. For those areas of NE PA hit hard last night, we're not yet out of the woods, but it appears the heavier rainfall will mainly be focused along the coastal boundary, from SE PA into northern NJ and the lower Hudson Valley. A secondary focus will be along the stationary front through central NY and into Bradford County, but with moderate/heavy rainfall far more localized. No big changes to the forecast, other than to delay the onset of higher PoPs and attempt to add some geographical focus on the aforementioned areas. 350 PM Update: A stationary front continues to bisect the area, which has allowed for some showers to develop as expected. Abundant cloud cover has prevented these showers from growing into thunderstorms and therefore took out mention of thunder prior to 5PM. Some thunderstorms have been able to develop across Central and Southeastern PA and these will work its way northward towards our region as the remainder of the afternoon progresses and into this evening. With not enough instability present, any thunderstorms will be on the weak side. With short corfidi vectors, PWATs over 1.5" and a deep warm cloud layer, locally heavy rainfall is a concern through this evening. That being said, this threat looks a lot more isolated compared to yesterday with the lack of instability and widespread heavier rainfall rates. With the isolated nature of this flash flooding threat and low confidence in exact locations of heavier rainfall, opted to not issue a Flood Watch with this forecast package. A short-fused Flood Watch can always be issued if necessary, but the majority of the messaging will likely be done with localized Flood Advisories and/or lower-end Flash Flood Warnings. By late tonight, shower coverage (and the heavy rainfall threat) diminishes, but lingering showers are still possible late tonight/early Monday morning. The main upper trough on Monday will finally move farther to the east. This will allow for a drying trend, although still cannot rule out some isolated showers or afternoon thunderstorms, mainly east of I-81. Partial sunshine is expected, along with highs in the lower to mid 70s. Dry weather is expected Monday night with high pressure briefly in control. With some lingering low-level moisture, patchy fog will be possible. Lows are expected to be in the 50s. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/... 315 PM Update... A weak ridge holds its place Tuesday morning allowing for a dry start to the day. 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 PM Update... 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 /06Z 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...BJG NEAR TERM...BJG/MPH SHORT TERM...ES LONG TERM...ES AVIATION...MPK
Hazardous Weather Outlook National Weather Service Binghamton NY 326 PM EDT Sun Sep 10 2023 NYZ009-015>018-022>025-036-037-044>046-055>057-062-PAZ038>040-043- 044-047-048-072-111930- 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- 326 PM EDT Sun Sep 10 2023 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...This afternoon and tonight. Showers and some thunderstorms will bring locally heavy rainfall and a risk for localized flash flooding through this evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday. An additional round of 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.
The Binghamton radar (KBGM), 56 km away, was scanning. The volume nearest the first event began at 05:32 UTC.
1 flash flood. Local standard time, as filed.
Washouts of Sheshequin Road were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2023Every state in 2023This day in weather historyWarnings in Pennsylvania, 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: 1140888.