Showers and a few thunderstorms developed ahead of a cold front during the evening of September 10th. One thunderstorm traveled along the St.
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The episode as NWS BTV wrote it up.
Showers and a few thunderstorms developed ahead of a cold front during the evening of September 10th. One thunderstorm traveled along the St. Lawrence river and produced isolated damaging winds in Hammond and Morristown.
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 Sep 10, 7:02 PM EST, 35 minutes earlier.
Area Forecast Discussion National Weather Service Burlington VT 802 PM EDT Sat Sep 10 2016 .SYNOPSIS... A cold front will sweep across New York tonight reaching Vermont around dawn accompanied by a band of showers and a few thunderstorms, especially in northern New York, some with locally heavy rain and gusty winds. The cold front will clear the area on Sunday with gusty winds and drier and cooler weather. High pressure will bring mostly sunny and seasonably mild weather through Tuesday. A cold front on Wednesday will result in a taste of fall for late week. && .NEAR TERM /THROUGH SUNDAY/... As of 713 PM EDT Saturday...Modest updates to sky cover, pops and sensible weather over the next 6 hours to account for current observational trends. Warm front has lifted bodily northward and is clearing north into southern Canada as of 700 pm with deepening moist southerly flow now surging into the forecast area. Meanwhile, a surface cold front is trudging steadily east across the lower Great Lakes and is oriented along or just west of a line of strong convection from Lake Ontario south and west through the Buffalo metro area into northeast Ohio. Based off latest CAM output, we've lowered pops considerably east of the St Lawrence Valley until later this evening, after which the eastward progress of the surface front will push the then weakening band of showers/storms across the forecast area. With a deeply moist airmass (PWATS to 2.0 inches) advecting atop the area, locally heavy downpours will remain possible. However, it increasingly appears the best threat of strong to locally severe storms will be confined to the western slopes of the Adirondacks into the St. Lawrence Valley where juxtaposition of lingering instability and robust boundary layer wind fields will occur this evening in a typical high shear/low CAPE environment. Indeed, latest KTYX VWP profiles support recent hi-res model output suggesting 40-50 kt southwesterly flow will occur in the 1-2 kft band immediately preceding the line of showers/storms this evening in this area. Thus any small low-topped line segments and/or short bowing segments, if they develop, will be watched closely - generally in the 8 pm to midnight time frame. By later tonight, the weakening band of showers/isolated storms will push steadily through the forecast area, pushing into our eastern VT by sunrise or shortly thereafter. Current forecast low temperatures and cloud cover/dewpoint fields largely remain on track so little other changes needed at this point. Prior discussion from 221 PM EDT Saturday... Sunday: By sunrise...cold front is quickly approaching the Champlain Valley with showers largely across VT quickly exiting as cold front passes. Behind the front...developing strong cold air advection under building high pressure will promote deep mixing tapping into an exiting low/mid level jet around 30-40kt at 925-850mb. This should account for skies trending to partly sunny by the afternoon and winds gusting through the day in the 25-35mph range. After about a week of above normal temperatures, it will seem cool BUT we'll finally see a return to near normal highs ranging from the mid 60s to mid 70s. && .SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY/... As of 221 PM EDT Saturday...Sunday night through Tuesday will be largely dominated by high pressure building from the Ohio River Valley into the Northeast before moving offshore with a warmer return flow on Tuesday ahead of next cold front. Mainly clear skies Sunday night with light winds and recent rainfall will set the stage for dense radiational fog to develop in the climo favored river valleys and mountain hollows. Also...new colder airmass will help lower temps into the 40s with possibly some upper 30s in NEK and Adirondacks but 50s along the lake shore. Highs Monday will be a few degrees milder than Sunday with plentiful sunshine and lack of cold air advection...back to seasonable 70s. Another mainly clear night on Monday night but one day removed from precipitation and some slight gradient developing. Areas of fog still likely but not as widespread as Sunday night/Monday morning and not as cool. On Tuesday...return flow and decent amount of sun until afternoon will moderate temperature back to above seasonable levels in the mid 70s to lower 80s. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... As of 221 PM EDT Saturday...Not much change from what we've been talking about the past few days. A strong cold front Tuesday night/Wednesday brings fall to the north country with High pressure dominating the rest of the work week. Tuesday night through Wednesday we continue to highlight the chance for some showers as strong cold front looks to swing through. Overall the system is pretty progressive so rainfall not looking to be a big deal, but behind the front strong cold air advection with high pressure building southeastward from south/central Canada will usher in a seasonally cold airmass which will dominate our weather right through the end of the work week. Clearing skies Wednesday night then mainly clear through early Friday with some clouds thereafter as return flow begins as high pressure begins to slides south and east. A cold night both Wed and Thu Nights and a cool day on Thursday despite plenty of sunshine. On Friday...temperatures moderate back to seasonable levels. The combination of departing ridge and approaching northern stream trough means southwest flow with more clouds...milder temperatures on Saturday and leaning toward dry conditions although conflicting guidance lends to lower confidence by Saturday afternoon. && .AVIATION /00Z Sunday THROUGH Thursday/... Through 00Z Monday...Complex forecast with immediate concern being a combination of showers and thunderstorms around the Saint Lawrence Valley and LLWS from low level jet moving in from the west. VFR conditions expect throughout most of the period, exception of MVFR vis/cigs with showers and t-storms with cold frontal passage 03Z-12Z. Wind shear expected out of the SW at 35-45kts around 2kft at KMSS and KSLK this evening before gusts develop after 06Z. LLWS also possible at KMPV and KRUT mainly between 05Z-10Z, while channeling up the Champlain Valley will keep surface winds higher, especially with gusts developing at KBTV 06Z through the rest of the period. Front and associated showers will exit east mid to late Sunday morning. Clouds will diminish but wind gusts will remain with sustained NW 10-15kts gusts 20-30kts throughout the day. Outlook 00Z Monday through Thursday... 00z Mon-06z Wed: Mainly VFR under high pressure except LIFR nocturnal fog possible SLK/MPV Sunday night and again Monday night, mainly 06-13Z. 06z Wed-06z Thu: VFR with MVFR possible in showers associated with a cold front. 06z Thu onward: VFR under high pressure. && .MARINE... Southerly winds have been increasing to 15 to 20 kts with gusts as high as 29 knots at Diamond Island in the last hour ahead of a strong cold front. Waves increasing to 1 to 3 feet on average but again could be higher on the open waters tonight. That strong cold front will reach Lake Champlain between 5 and 7 a.m. and may be accompanied by a band of heavy showers lasting an hour or so along with a chance of a thunderstorm and potentially locally stronger winds. Behind the cold front on Sunday, winds will shift to SW then gradually W then NW during the afternoon again around 15 to 25 knots. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...None. NY...None. && SYNOPSIS...SLW NEAR TERM...JMG/KGM/SLW SHORT TERM...SLW LONG TERM...SLW AVIATION...KGM MARINE...Verasamy
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BURLINGTON VT 455 AM EDT SAT SEP 10 2016 NYZ026>031-034-035-087-VTZ001>012-016>019-110900- NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON- SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON- WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE- WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA- WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR- EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND- 455 AM EDT SAT SEP 10 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN VERMONT. .DAY ONE...TODAY AND TONIGHT. SHOWERS ARE EXPECTED TO THROUGH EARLY AFTERNOON TODAY FOLLOWED BY A FEW THUNDERSTORMS IN THE ST. LAWRENCE VALLEY OF NEW YORK LATER IN THE DAY INTO TONIGHT AND THERE IS A SLIGHT CHANCE THEY WILL BE SEVERE...PRODUCING STRONG GUSTY WINDS ESPECIALLY IN NEW YORK. THE SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE INTO VERMONT BY EARLY SUNDAY MORNING BUT SHOULD BE WEAKER BY THAT POINT. OTHERWISE, A BRIEF HEAVY DOWNPOURS WILL ACCOMPANY THE SHOWERS AND STORMS. WINDS MAY GUST TO 25 TO 35 MPH ESPECIALLY IN THE CHAMPLAIN AND ST LAWRENCE VALLEYS AND IN THE HIGHER TERRAIN LATE TODAY AND TONIGHT CONTINUING EARLY SUNDAY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATER TODAY AND TONIGHT.
The Ft Drum radar (KTYX), 77 km away, was scanning. The volume nearest the first event began at 00:37 UTC.
2 thunderstorm wind. Local standard time, as filed.
Several trees downed by thunderstorm winds.
Trees and powerlines downed by thunderstorm winds in Brier Hill.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2016Every state in 2016This day in weather historyWarnings in New York, September 2016
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: 649557, 649558.