A cold front interacted with a warm and humid airmass to produce several clusters of thunderstorms on September 5. A few of these storms became severe in the Capital District and Mid-Hudson Valley with minor wind damage reported.
Every event with a place to put it. Tap one for its entry below.
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 ALY wrote it up.
A cold front interacted with a warm and humid airmass to produce several clusters of thunderstorms on September 5. A few of these storms became severe in the Capital District and Mid-Hudson Valley with minor wind damage reported.
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 Albany, NY wrote its last area forecast discussion before the first event at Sep 5, 12:26 PM EST, 2 hours 22 minutes earlier.
Area Forecast Discussion National Weather Service Albany NY 126 PM EDT Tue Sep 5 2017 .SYNOPSIS... A cold front will slowly move across eastern New York and western New England today into tonight. Showers and some strong thunderstorms with gusty winds and heavy rainfall will impact mainly the Capital Region and southern Vermont south and east into the early evening. The cold front will stall over eastern New England extending southwest along the Atlantic seaboard with weak waves of low pressure moving along it bringing periods of showers and cool temperatures Wednesday into Thursday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... As of 1 PM EDT, only isolated coverage of showers thus far from the central Mohawk Valley/Lake George region and points south and east. Plenty of clouds/smoke aloft continues across the region, with some breaks of sun across far SE areas. The cold front was located across portions of the western Adirondacks and Mohawk Valley, where temps have fallen into the upper 50s to lower 60s. Temps are mainly in the upper 60s to mid 70s farther south and east, except for upper 70s to lower 80s where some sunshine filtered through across portions of southern VT, lower elevations in western MA, as well as across NW CT and the mid Hudson Valley of NY. Thus far, most of the showers and embedded thunderstorms have been occurring across central/northern NYS, closer to better mid level forcing and thermal gradient, and also coincident with the right entrance region to strong upper level jet. A shortwave currently over central/eastern PA is expected to track NE this afternoon. The forcing associated with this feature should allow for increased coverage of showers/thunderstorms to develop by mid to late afternoon, mainly for areas south and east of Albany, from the southeast Catskills northeast into the Berkshires and southern VT. Area 12Z soundings show a little bit of surface based instability over central and eastern NY with somewhat of enhanced instability at midlevels here at KALB, a bit of an EML with 6.9 C/Km in the 700-500 hPa layer and 6.8 C/Km in the 850-500 hPa layer. However, the surface based instability will be best from the mid Hudson Valley into western New England, potentially well over 1000 J/Kg. Deep layer 0-6 Km shear is decent, greater than 40 Kt, but that is mostly due to stronger winds well above the boundary layer as boundary layer winds will be weakening through the day over our region. With the prospect of the EML here in eastern NY extending into western New England, severe potential covered well in marginal to slight risk over eastern NY and western New England, although forecast soundings suggest these mid level lapse rates weaken as the afternoon progresses. There is deep moisture associated with the convection, not overly extreme, but enough so that training cells within slow eastward moving lines and bands of convection could produce locally heavy rain, enough for significant standing water in low lying areas and urban areas. No flash flood watches at this time due to the prospect of the more isolated more urban type flooding, with the best chances for the isolated flooding from the mid Hudson Valley to the Berkshires and NW CT. Adjusted temperatures in areas seeing more cloud cover and adjusted rain chances based on current radar trends. New thunderstorms will develop this afternoon from the eastern Catskills and mid Hudson Valley to near or just east of the Capital District to just east of the Lake George Saratoga region that again could touch severe levels and evolve into more of a heavy rain mode into this evening. Even though it is cooler from the Schoharie Valley and Capital Region through Lake George and Saratoga through the southern Adirondacks and western Mohawk Valley, there is still enough midlevel instability that MUCAPES less than 1000 J/Kg will still support less intense thunderstorms with locally gusty winds and heavy rain. && .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/... Tonight...Scattered thunderstorms will likely linger into the early evening with the cold front slowly pressing southward. The instability will continue to wane especially south and east of the I-90 corridor. The potential threat for any severe convection should diminish prior to 03Z. The showers should taper off especially west of the Hudson River Valley. The front begins to stall over western New England, and we kept some higher pops over those zones. Lows will be mainly in the 50s with a few upper 40s over the southern Adirondacks, and a few lower 60s across northwest CT. Total rainfall will be in the half an inch to inch and a quarter range with locally higher amounts. Wed-Wed night...The upper level trough axis remains upstream with the cold front becoming quasi-stationary over New England. In the southwest flow aloft, several ripples of low pressure will ride along the boundary with bouts of showers and/or rain. The consensus from the guidance is for the locations east of the Hudson River Valley to have the heaviest rain, but there still remains some uncertainty on the exact position of the front. We tended to place the higher QPF based on the WPC guidance over western New England. Pops were kept in the likely or categorical range across most of the region WED pm into the evening. Atlantic moisture will be tapped, and some weak elevated instability and even some sfc based instability near NW CT is indicated in the GFS/NAM, so we placed a slight chance of thunderstorms in east of the Hudson River Valley. Dank and cool conditions are expected with highs only in the 60s with some upper 50s over the mountains. The 00Z ECMWF/GFS/NAM track a stronger wave of low pressure over central and eastern New England Wed night, which should keep the higher rain tallies slightly further east. Nonetheless, an additional inch or so of rainfall is possible especially from the Hudson River Valley east. Lows will be in the upper 40s to mid 50s across the region. Thursday...Some scattered showers are possible once again as pieces of short-wave energy in the cyclonic flow impact the region with the sfc cold front well off the the coast. The cyclonic vorticity advection associated with the mid and upper level low will kick off some more showers. Temps will be slightly warmer than Wed with upper 60s to lower 70s in the valleys, and upper 50s to mid 60s over the higher terrain. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... The period starts out Thursday night with a upper level trough firmly entrenched across southeast Canada, the Great Lakes and the Northeast CONUS. Some lake effect rain showers will be possible across the western Adirondacks Thursday night, as lake- air temperature differentials become large enough for conditional lake induced instability to develop with a W-NW flow. On Friday, models indicating a more potent upper level disturbance moving across the area resulting in mainly scattered showers, but possibly more numerous over the Adirondacks where the best forcing looks to be. It will be rather cool, with any sunshine quickly resulting in instability clouds/showers developing with cold pool overhead. High temps expected to be around 5-10 degrees below normal. A few lingering showers will be possible Friday night as the upper trough axis swings through, mainly over the higher terrain. Saturday will remain cool with a northerly flow at the surface and the pesky upper level trough still a factor as it slowly meanders eastward into New England. The ECMWF continues to indicate a slower retreat of the trough, while the GFS is more progressive. Considering the fairly blocky upper level pattern expected to set up, with lean towards the more pessimistic ECMWF and mention slight to low chance pops through Saturday with high temps again 5-10 degrees below normal. It looks like the upper level trough will finally lose its influence on our weather Saturday night into Sunday, with drier air filtering in courtesy of high pressure moving in from the west. Temps Sunday will be warmer due to more sunshine, although still slightly below normal. Dry conditions and fair weather will persist Sunday night into Monday, as a sprawling area of high pressure builds over the region. && .AVIATION /17Z TUESDAY THROUGH SATURDAY/... Band of scattered showers and isolated thunderstorms well north and west will slowly build east while new showers and scattered thunderstorms form over eastern NY. Have times VCSH at the TAF sites from KGFL currently, through KALB and KPSF 19Z-20Z and KPOU the latest around 22Z this afternoon. Have included tempo groups late this afternoon and evening for MVFR conditions in thunderstorms at all TAF sites since current radar and satellite trends and mesoscale models show convection developing near the TAF sites. Once thunderstorms do develop, can amend for more precise timing and see if there are potential IFR conditions to include in the TAFs. Keeping VCSH in TAFs through tonight as activity slowly diminishes and decreases in coverage. Ceilings should remain MVFR through the night as shower activity deceases to isolated coverage by daybreak. More showers could develop through Wednesday morning and including VCSH at all TAF sites Wednesday morning. Ceilings and visibilities should be predominant just into VFR but could be borderline MVFR/VFR ceilings. Winds will be south to southwest at around 10 Kt this afternoon, diminishing to 6 Kt or less from the west to north tonight, once the initial band of showers and thunderstorms exits east. Winds will be variable at 5 Kt or less Wednesday morning. Outlook... Wednesday: High Operational Impact. Likely SHRA. Wednesday Night: High Operational Impact. Likely SHRA. Thursday: Moderate Operational Impact. Chance of SHRA. Thursday Night: Low Operational Impact. Slight Chance of SHRA. Friday: Moderate Operational Impact. Chance of SHRA. Friday Night: Low Operational Impact. Slight Chance of SHRA. Saturday: Low Operational Impact. Slight Chance of SHRA. && .FIRE WEATHER... A cold front will slowly move across eastern New York and western New England today into tonight. Showers and some strong thunderstorms with gusty winds and heavy rainfall will impact mainly the Capital Region and southern Vermont south and east into the early evening. The cold front will stall over eastern New England extending southwest along the Atlantic seaboard with weak waves of low pressure moving along it bringing periods of showers and unseasonably cool temperatures Wednesday into Thursday. The RH values will lower to 55-75 percent this afternoon and then recover to close to 100 percent Wednesday morning in the damp air mass. The RH values will only fall to 70 to 80 percent Wednesday afternoon. South to southwest winds will shift into the northwest to north as a front progresses through the region today into tonight, with speeds of 5-15 mph. The winds will be northwest on Wednesday at 5 to 10 mph. Winds will be stronger, and variable in direction in and near any thunderstorms. && .HYDROLOGY... The weather will be wet and unsettled today into Friday. Showers and thunderstorms will occur ahead of the cold front, especially today. Some locally heavy downpours and ponding of water on roadways and poor drainage flooding in low lying areas is possible this afternoon into the early evening. Rainfall amounts may range greatly from a few tenths to over an inch. Isolated flash flooding is possible in any training thunderstorms repeatedly moving over an area. If the potential becomes more widespread, then a flash flood watch may be needed. Additional rainfall is likely tonight through Thursday with several weak waves of low pressure moving along the cold front stalled just east of the Hydro Service area. Additional rainfall amounts of a half an inch to two inches are possible bringing total rainfall amounts from today to Wednesday night in the 1 to 2.5 inch range for areas from Albany and points south and east, with the higher amounts possible over western New England. Some within bank rises are expected on the main stem rivers, but the potential for widespread flooding is not anticipated at this time. The latest MMEFS guidance does not have any rivers forecasted to reach flood stage. For details on specific area rivers and lakes, including observed and forecast river stages and lake elevations, please visit the Advanced Hydrologic Prediction Service /AHPS/ graphs on our website. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...None. NY...None. MA...None. VT...None. && SYNOPSIS...Wasula NEAR TERM...KL/NAS/Wasula SHORT TERM...Wasula LONG TERM...JPV AVIATION...NAS FIRE WEATHER...KL/Wasula HYDROLOGY...KL/Wasula
Hazardous Weather Outlook National Weather Service Albany NY 459 AM EDT Tue Sep 5 2017 CTZ001-013-MAZ001-025-NYZ047>054-058>061-063>066-084-VTZ013>015- 061100- Northern Litchfield-Southern Litchfield-Northern Berkshire- Southern Berkshire-Schoharie-Western Schenectady-Eastern Schenectady- Southern Saratoga-Western Albany-Eastern Albany-Western Rensselaer- Eastern Rensselaer-Western Greene-Eastern Greene-Western Columbia- Eastern Columbia-Western Ulster-Eastern Ulster-Western Dutchess- Eastern Dutchess-Southern Washington-Bennington-Western Windham- Eastern Windham- 459 AM EDT Tue Sep 5 2017 This Hazardous Weather Outlook is for northwestern Connecticut, western Massachusetts, the Schoharie Valley, eastern Catskills, Greater Capital Region including southern Washington County, the Taconics, and the mid Hudson Valley in east central New York, and for southern Vermont. .DAY ONE...Today and Tonight. There is a Slight Risk of severe thunderstorms ahead of a cold front this afternoon into the early evening. The main severe threat will be damaging winds of 58 mph or greater, but large hail one inch in diameter is also possible. The thunderstorms will be capable of producing very heavy rainfall and locally heavy downpours which may produce ponding of water on roadways, and poor drainage flooding in low lying and urban areas. An isolated flash flood may occur if thunderstorms train or repeatedly move over the same area. If the potential for widespread flash flooding increases, then a flash flood watch maybe needed later in time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible this afternoon into this evening. NYZ032-033-038>043-082-083-061100- Northern Herkimer-Hamilton-Southern Herkimer-Southern Fulton- Montgomery-Northern Saratoga-Northern Warren-Northern Washington- Northern Fulton-Southeast Warren- 459 AM EDT Tue Sep 5 2017 This Hazardous Weather Outlook is for the southern Adirondacks, the Lake George Saratoga Region, and the western and central Mohawk Valley of east central New York. .DAY ONE...Today and Tonight. There is a Marginal Risk that a few thunderstorms may become severe ahead of a cold front this afternoon into the early evening. The main severe threat will be damaging winds of 58 mph or greater, but large hail one inch in diameter is also possible. The thunderstorms will be capable of producing very heavy rainfall and locally heavy downpours which may produce ponding of water on roadways, and poor drainage flooding in low lying and urban areas. An isolated flash flood may occur if thunderstorms train or repeatedly move over the same area. If the potential for widespread flash flooding increases, then a flash flood watch maybe needed later in time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation maybe needed later today.
Special Weather Statement National Weather Service Albany NY 252 PM EDT TUE SEP 5 2017 NYZ058>060-063>065-051945- Western Ulster-Eastern Greene-Western Columbia-Western Greene-Western Dutchess-Eastern Ulster- 252 PM EDT TUE SEP 5 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ULSTER... NORTHWESTERN DUTCHESS...WESTERN COLUMBIA AND SOUTHEASTERN GREENE COUNTIES... At 251 PM EDT, a strong thunderstorm was located near West Shokan, or 17 miles southwest of Hunter, moving northeast at 35 mph. Winds in excess of 40 mph are possible with this storm. This storm will be near... West Shokan and Woodland Valley Campground around 255 PM EDT. Mount Tremper, Phoenicia and Olivebridge around 300 PM EDT. Kenneth L Wilson Campground and Lanesville around 305 PM EDT. West Hurley around 310 PM EDT. Woodstock around 315 PM EDT. Saugerties, North-South Lake Campground and Saugerties South around 325 PM EDT. Hudson, Catskill, Claverack, Livingston, Athens, Lorenz Park and Claverack-Red Mills around 345 PM EDT. Other locations impacted by this storm include Kerleys Corners, Glenford, Manorville, Katsbaan, Shultis Corners, Sweet Meadows, Pacama, Brodhead, Burden and Rossman. LAT...LON 4203 7450 4247 7372 4209 7367 4185 7436 TIME...MOT...LOC 1851Z 235DEG 31KT 4198 7435 NAS
Special Weather Statement
National Weather Service Albany NY
348 PM EDT TUE SEP 5 2017
CTZ001-013-NYZ065-066-052015-
Northern Litchfield-Southern Litchfield-Eastern Dutchess-Western
Dutchess-
348 PM EDT TUE SEP 5 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LITCHFIELD AND DUTCHESS
COUNTIES...
At 347 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Myers Corner to near Beacon.
Movement was northeast at 35 mph.
Winds in excess of 40 mph and pea size hail are possible with these
storms.
These storms will be near...
Red Oaks Mill around 355 PM EDT.
Pleasant Valley around 400 PM EDT.
Millbrook, Hopewell Junction and Wingdale around 410 PM EDT.
Pawling, Kent and Dover Plains around 415 PM EDT.
Other locations impacted by these storms include South Canaan,
Lithgow, Hoxie Corner, Wrightville, Salisbury, South Amenia, Pleasant
Ridge, East Litchfield, Washington Hollow and Plymouth Green.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4145 7400 4152 7400 4158 7395 4163 7395
4175 7390 4199 7358 4198 7353 4203 7352
4204 7351 4202 7307 4162 7302 4152 7345
4163 7350 4165 7349 4167 7352 4153 7353
4149 7393 4144 7398
TIME...MOT...LOC 1947Z 234DEG 28KT 4163 7384 4147 7396
NASThe Albany radar (KENX), 111 km away, was scanning. The volume nearest the first event began at 19:50 UTC.
3 thunderstorm wind. Local standard time, as filed.
The public reported a tree down on a house due to thunderstorm winds.
Trees and wires were blown down on Route 376 due to thunderstorm winds.
Trees and wires were reported down due to thunderstorm winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2017Every state in 2017This day in weather historyWarnings in New York, September 2017
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: 721898, 721899, 721900.