A triple point between an occluded, cold and warm fronts extending south from a surface low across James Bay Canada moved across northern NY during the afternoon hours of June 10th. The airmass was marginally unstable with a few showers and an isolated thunderstorm or two.
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The episode as NWS BTV wrote it up.
A triple point between an occluded, cold and warm fronts extending south from a surface low across James Bay Canada moved across northern NY during the afternoon hours of June 10th. The airmass was marginally unstable with a few showers and an isolated thunderstorm or two. One thunderstorm briefly intensified and may have interacted with a sea-breeze front off of Lake Champlain that produced a very brief EF0 tornado in Beekmantown with several trees downed, some yard objects lifted and moved and a partial unstable roof torn off a house.
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 Burlington, VT wrote its last area forecast discussion before the first event at Jun 10, 2:38 PM EST, 0 minutes earlier.
Area Forecast Discussion National Weather Service Burlington VT 338 PM EDT Tue Jun 10 2025 .SYNOPSIS... A cold front will continue to produce a broken line of showers and thunderstorms across the Champlain Valley into Vermont through early this evening. Temperatures will cool back into the 40s and 50s overnight, before warming into the 70s to near 80 on Wednesday. A period of gusty southwest winds are expected over northern New York on Wednesday afternoon and evening, with localized gusts 35 to 45 mph possible. Drier and cooler weather returns for Thursday into Friday. && .NEAR TERM /THROUGH WEDNESDAY NIGHT/... As of 317 PM EDT Tuesday...Sfc analysis places cold frnt entering the CPV attm with a broken line of showers and a few embedded rumbles of thunder. Per RAP analysis instability is limited with sfc based CAPE values in the 800-1200 J/kg range, but deep layer shear is strong with values in the 45 to 55 knot range, associated with increasing wind speeds in the mid lvls. Given the dynamics and available environmental conditions, a brief stronger convective element is possible with localized wind gusts up to 45 mph and frequent lightning. Greatest potential is acrs the CPV, where some sunshine has developed and temps have warmed into the mid 70s. The threat will end or shift east of VT by 9 PM. GOES 19 mid lvl water vapor shows developing dry slot over northern NY, which should result in clearing skies this evening, before additional mid lvl moisture rotates back into northern NY overnight. Temps fall back into the upper 40s to mid 50s with comfortable humidity values overnight. Weds/Weds night primary concern is a period of gusty winds, especially northern NY/SLV. NAM/GFS both show a 925mb to 850mb low level jet of 45 to 55 knots lifting acrs northern NY on Weds aftn/evening. Soundings support steepening sfc to 800mb lapse rates behind secondary boundary, helping to produce localized gusts 35 to 45 mph. Its interesting to note, NAM3KM indicates top of the mixed layer winds at MSS near 55 knots, so a few higher gusts are possible, if mixing is maximized during the early evening hours. HREF mean wind gusts indicate 35 to 45 mph with a few higher pockets over northern NY and into parts of central/northern VT. Otherwise, best dynamics with potent/compact s/w energy and deeper moisture look to stay north of our cwa on Weds aftn/evening. Have continued with schc/chc pops near the International Border, but given dry airmass thinking areal coverage is limited. Based on better mixing and progged 925mb temps btwn 16-18C, have gone above NBM for highs on Weds, with values in the mid 70s to lower 80s. Weds night is quiet and comfortable with temps falling back into the 50s to lower 60s, along with decreasing winds. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... As of 317 PM EDT Tuesday...Quiet wx Thursday into Friday as surface high pressure bridges in from eastern ON/western QE on drying northwest flow. As such, looking mainly at clear/partly cloudy skies and seasonal temperatures with slightly greater than normal diurnal ranges for mid-June. Outside a stray afternoon sprinkle along the intl border Thursday afternoon, dry weather is expected. && .LONG TERM /FRIDAY THROUGH TUESDAY/... As of 317 PM EDT Tuesday...No impactful weather is expected. Clouds return by Friday night into the upcoming weekend with at least a period/chance for a scattered showers, mainly on Saturday as decaying upper Midwest convection is shunted east-southeast into the region. However, confluent west- northwesterly flow aloft and lack of larger-scale forcing support PoPs mainly at the chance level with many hours of dry weather as well. High temperatures remain near or just slightly below seasonal norms as there will be a greater degree of mid-level cloud cover. By next week dry weather largely returns for the Monday/Tuesday time frame. && .AVIATION /19Z TUESDAY THROUGH SUNDAY/... Through 18Z Wednesday...Low clouds with IFR CIGS continue to impact MPV/EFK tafs at this time, but conditions are expected to improve to MVFR/VFR in the next 1 to 2 hours. A cold front over northern NY is producing a broken line of showers and thunderstorms. This will impact most of our taf sites between 18z-20z for northern NY tafs and between 20z-24z for our VT sites. Brief heavy rainfall, localized wind gusts up to 35 mph, and some cloud to ground lightning is possible. Have utilized tempo groups to highlight brief period of MVFR conditions with showers/storms today. Otherwise, mostly VFR conditions overnight with good mixing, should limit fog/br development. Breezy southwest winds develop on Weds with gusts 15 to 25 knots expected, with VFR conditions at all sites. Outlook... Wednesday Night: VFR. Slight chance SHRA. Thursday: VFR. NO SIG WX. Thursday Night: VFR. NO SIG WX. Friday: VFR. NO SIG WX. Friday Night: VFR. Chance SHRA. Saturday: Mainly MVFR, with local IFR possible. Chance SHRA. Saturday Night: MVFR/IFR conditions possible. Chance SHRA. Sunday: Mainly MVFR, with local IFR possible. Slight chance SHRA. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...None. NY...None. && SYNOPSIS...Taber NEAR TERM...Taber SHORT TERM...JMG LONG TERM...JMG AVIATION...Taber
Hazardous Weather Outlook National Weather Service Burlington VT 310 PM EDT Tue Jun 10 2025 NYZ026-027-029>031-034-087-111915- Northern St. Lawrence-Northern Franklin-Southeastern St. Lawrence- Southern Franklin-Western Clinton-Western Essex- Southwestern St. Lawrence- 310 PM EDT Tue Jun 10 2025 This Hazardous Weather Outlook is for northern New York. .DAY ONE...This afternoon and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A period of gusty southwest winds are expected across northern New York on Wednesday afternoon and evening. Localized gusts 35 to 45 mph are expected with a power outages possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ028-035-VTZ001>011-016>021-111915- Eastern Clinton-Eastern Essex-Grand Isle-Western Franklin-Orleans- Essex-Western Chittenden-Lamoille-Caledonia-Washington- Western Addison-Orange-Western Rutland-Eastern Franklin- Eastern Chittenden-Eastern Addison-Eastern Rutland-Western Windsor- Eastern Windsor- 310 PM EDT Tue Jun 10 2025 This Hazardous Weather Outlook is for northern New York, central Vermont, northeast Vermont, northwest Vermont and southern Vermont. .DAY ONE...This afternoon and tonight. A broken line of showers and thunderstorms will impact the Champlain Valley and parts of Vermont through early this evening. A few stronger storms will be capable of localized gusty winds, brief heavy rainfall, and cloud to ground lightning. The threat ends by 9 PM this evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Burlington radar (KCXX), 38 km away, was scanning. The volume nearest the first event began at 19:37 UTC.
1 tornado. Local standard time, as filed.
Reports of multiple downed trees were investigated and confirmed an EF-0 briefly touched down. Trees were uprooted and snapped. Part of a roof was peeled and wrapped around a powerline. Small objects, like a trampoline, were flung.
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