428 FXUS61 KBGM 221249 AFDBGM Area Forecast Discussion National Weather Service Binghamton NY 849 AM EDT Sun Jun 22 2025 .SYNOPSIS... Strong to severe storms with torrential rainfall will continue this morning across east central NY and far northeast PA. The first true taste of summer arrives today and into next week with day time highs rising into the 90s and increasing humidity levels. && .NEAR TERM /THROUGH MONDAY/... 845 AM Update... An enhanced low level jet is combining with a stalling frontal boundary and high levels of MUCAPE/PWATs to create an area of heavy training thunderstorms over east-central NY and far NE PA this morning. MUCAPE values between 2000-3000 J/kg are supporting widespread thunderstorm development. These storms can produce gusty winds, hail and torrential downpours. PWATs are approaching 2" across Central NY, along with impressive 850mb moisture transport vectors. We have received reports of 3-4 inches of rain so far across Chenango county, with 2-3.5 inches across surrounding locations/counties. This is causing significant flash-floding/flooding in these areas. Please heed the latest warnings! CAMs show this area of training convection drifting SW ward into the late morning and early afternoon, then stalling and eventually dissipating by mid to late afternoon hours. Additional storms could also develop as instability increases along and SW of the front. 100 AM Update.. The MCS continues to evolve north of the area, starting to bow and move southward. Contrary to guidance, where half of solutions favor a more eastward track, as well as the upper level ridge that was attempting to keep this MCS on an eastward track, it seems that strong to severe storms can be expected for areas mainly east of I-81, but very well could extend into all of Central NY. The biggest threat overnight will be strong to damaging winds. These storms will likely taper off getting closer to the NY-PA state border. For tomorrow, elevated CAPE values will be drastically increasing late tonight into early Sunday morning, and eventually becoming surface based. By 5 AM this morning, guidance shows MUCAPE of up to 2500 J/kg coming into the NW half of our CWA, and by 8 AM that increases to 3500 J/kg as mid level lapse rates approach 8 C/km in the EML environment. If any storms can get going in this environment they could have extremely high storm tops, reaching 50k ft or higher. DCAPE values also reach 850 J/kg, so despite a minor low level stable layer, if the winds can break through this, storms could certainly produce isolated damaging winds as well. Heading into late morning and the afternoon it is looking hot and muggy with 500 mb heights getting up near 598 dm which is anomalously high. Dry air above the mixed layer may help limit dew points to the upper 60s and low 70s but if dry air does not mix in or evapotranspiration is able to keep up with mixing, dew points may be in the low to mid 70s. Highs today push into the upper 80s to mid 90s so widespread head indices of 100+ are likely. Limiting factors to the heat is that forecast soundings do have weak capping. In previous similar set ups with very strong ridging and high heat and humidity, showers and thunderstorms were able to form in the late morning and early afternoon and that ended up dropping temperatures before they were able to get as warm as forecast so that could occur again. Heat Advisories continue, and we will see peak heat indices between about 95 to 104 degrees late this afternoon. There seems to be no need to upgrade any zones to extreme heat warnings for Sunday at this time...especially due to the uncertainty with clouds and pop up showers and storms mentioned above. Monday will be hotter, with the strong ridge building overhead, and heat indices up to 104 expected. Heat Advisories will continue going into the Short Term Discussion. && .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/... 130 AM Update... Strong ridging remains in place for the short term with 500 mb heights up around 595 t0 598 dm. With the jet stream back to the north and weaker flow over our region along with a stout subsidence inversion, showers and thunderstorms will have a tough time forming in the afternoons despite plenty of heat and humidity. Still an isolated thunderstorm cant be ruled out Tuesday afternoon as there is still 2000 to 3000 J/kg of CAPE. Mountains and terrain could provide just enough lift to break through the strong capping but confidence was too low at this time to add chances of precip to the Catskills or Poconos on Tuesday. Wednesday will have the ridge slowly beginning to flatten with weaker capping. There is a better chance at afternoon thunderstorms, especially for the Southern Tier and northward as the northern edge of the ridge shifts back south. Day time highs Tuesday will likely push into the mid to upper 90s with dew points in the upper 60s to low 70s. Dry air in the subsidence inversion may mix in so that could help lower dew points a bit in the afternoon but it will still be very hot. && .LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/... 130 AM Update... The long term is looking fairly active as the ridge flattens out and we end up on the north edge of the ridge through the end of the week. This will put us into the "Ring of Fire" with frequent shortwaves and convective complexes moving through. Chances of precipitation were kept high, especially in the afternoons and evenings when there is plenty of CAPE. As of now forecast soundings and ensembles dont show great probability of shear greater than 30 knots along with greater than 1000 J/kg of SBCAPE but still ensemble means for 0-6 km shear are around 15 to 25 which is good enough for a stronger storm or two each afternoon. Precipitable water values Thursday onward are high and reside over 1.5 inches Thursday through Saturday so flash flooding will be a concern. && .AVIATION /13Z SUNDAY THROUGH THURSDAY/... 630 AM Update... VFR TAFs are expected most of the time at all terminals over the next 24 hours, except for a few hours between 15Z and 21Z where MVFR ceilings could move in. There are also chances that KITH and KBGM see a rogue thunderstorm mainly Sunday during the day, but confidence was too low to include in the TAF package. Surface winds will be mainly west to southwest 5 to 10 knots gusting toward 20 knots through the period. Outlook... Sunday night...VFR. Monday thru Tuesday...High pressure with VFR expected. Wednesday and Thursday....Chances for scattered showers and thunderstorms around with associated restrictions. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...Heat Advisory from noon today to 8 PM EDT Wednesday for PAZ038>040-043-044-047-048-072. NY...Heat Advisory from noon today to 8 PM EDT Wednesday for NYZ009- 015>018-022>025-036-037-044>046-055>057-062. && $$ SYNOPSIS...KL NEAR TERM...KL/MJM SHORT TERM...AJG LONG TERM...AJG AVIATION...KL