Isolated thunderstorms on July 20 resulted in a couple reports of wind damage in Dutchess County.
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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.
Isolated thunderstorms on July 20 resulted in a couple reports of wind damage in Dutchess County.
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 Jul 20, 3:46 PM EST, 2 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Albany NY 446 PM EDT Thu Jul 20 2017 .SYNOPSIS... Showers and thunderstorms will move across portions of the area this evening, especially south and east of Albany. Then high pressure will build eastward from the Great Lakes Friday into Saturday with dry conditions and slightly above normal temperatures. The next chance of rain arrives Saturday night into Sunday, as a frontal boundary approaches from the west. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... As of 400 PM EDT...Watching a cluster of strong to severe thunderstorms moving southeast across the south-central tier of NY and NE PA at this hour. Northward extension of this convection has deteriorated to light stratiform showers across central NY into the Mohawk Valley and southern Adirondacks. Isolated storms are also initiating along outflow boundaries across the Berkshires. Based on latest radar/observational trends and hi-res CAMs, the main threat for any severe storms looks to be across Ulster/Dutchess/Litchfield counties and primarily across the southern half of these counties. Main threat damaging winds due to strong wind field aloft and expected relatively fast storm motions. From SPC mesoanalysis, moderately unstable environment in place with around 1000-2000 J/Kg noted from around Albany southward with 0-6 km bulk shear increasing to 40-50 kt. Best chance for severe storms will be between around 6 to 8 PM. Farther north across much of the rest of the area there could be a brief shower or thunderstorm, but likely not severe. Showers and storms should quickly move east of our area by later this evening, as the upper level short wave quickly tracks eastward into New England. Dry conditions expected overnight, with some patchy fog developing, especially for areas that see rainfall during the evening and any substantial clearing overnight. Low temps will mainly be in the lower to mid 60s, with some upper 50s in the Adirondacks and southern Green Mountains. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... Tranquil, but warm conditions expected Friday as a ridge of surface high pressure extends east from the Great Lakes. Westerly flow will lead to continued above normal temperatures in the 85-90 range for valley locations, although humidity levels should be lower than Thursday and a persistent 10-15 mph breeze will be make it feel more comfortable. High pressure will move overhead Friday night with continued dry conditions and seasonable temperatures. Models have come into somewhat better agreement, especially indicating dry conditions persisting through Saturday, delaying the approach of a frontal boundary from the Great Lakes and Ohio Valley region. Even the previously faster NAM has delayed onset of showers until just after dark Saturday. So, it appears we will have two consecutive dry days Friday and Saturday. Will mention warmer temperatures for Saturday as well compared to previous forecasts due to delayed onset of showers and more sunshine during the first half of the day. Chances for showers will increase Saturday night, as the boundary approaches from the west. However, models differ with the placement of this feature, which will have implications for where more persistent showers eventually set up. Will mention chance pops for now across the entire area, with time to fine- tune as guidance comes into better focus with the position of the boundary over the next day or so. && .LONG TERM /SUNDAY THROUGH THURSDAY/... An unsettled pattern is expected for the long term with many uncertainties in play. We start off with a 1010mb Canadian high situation over the Northeast and a system in the southern Great Lakes advancing eastward. Each model suite for the past few days has consistently shown its associated warm front edging close to the southern tier of our CWA in the Saturday night - Sunday time frame. However, the main forecast challenge here is just how far north its thermal gradient extends which will impact two things...which of our areas receives precipitation and how much. To matters even more challenging, guidance continues to indicate a weak shortwave riding along the stalled boundary during this time, bringing the potential for a period of rain to those areas near the boundary. At this time, most of the guidance continues to show the warm front stalling near Long Island/NYC/coastal CT meaning our far southern tier counties have the highest probabilities of receiving precipitation. Thus, have reflected that in the latest update giving high chance POPS to Ulster/Dutchess/Litchfield counties. It is important to note that in these situations, if the front stalls a few miles north or south of where guidance indicates, that can have large impacts on which area see precip and how much. After the weak shortwave exits sometime Sunday, we could see a dry break before our attention turns to a stronger positively trough over the Great Lakes which is expected to swing into the Northeast for Sunday night/Monday. This system looks to bring an increasing threat for precipitation during the Sunday night/Monday period with the previously discussed warm front still south of our CWA. Given that our 1010mb high should still be wedged over New England/eastern NY, the precip associated with the incoming system may struggle to reach our CWA initially thanks to mid level dry air and subsidence. Eventually, as the trough becomes neutrally tilted and enters the Northeast, more widespread precipitation is expected from west to east but again uncertain on exactly when precip begins during the Sunday night/Monday period. Unsettled conditions linger into Tuesday as the neutrally titled trough is slow to exit with continued threat for showers. For now, left chance POPS for the entire CWA. Guidance suggests that the system cuts off at 700mb with a trowal developing as the system gradually moves through NY and western New England. There is an associated cool pool aloft so included slight chance thunder as well for Tuesday. Temperature wise, we should end up below normal with highs only in the 70s. Could see the Adirondacks struggling to rise out of the 60s and have reflected that in the newest update. Once the low exits Tues night/Wed, heights rise and we should see high pressure lead to drier and slightly warmer weather mid - week. Another shortwave arrives for the end of the extended and have increased to slight chance POPS for Thursday/Friday. && .AVIATION /21Z THURSDAY THROUGH TUESDAY/... The thunderstorms moving across western New York into central New York are expected to impact KPOU late in the day as they head southeastward. Have a TEMPO group for the time frame they are expected. Only have VCSH mentioned at KALB and KPSF. MVFR conditions are expected with the storms with brief IFR possible. Otherwise looking at VFR conditions through this evening with MVFR conditions expected to develop as fog forms overnight. Any fog will burn off after sunrise with VFR conditions then expected. Generally westerly winds will diminish this evening becoming light to calm for the overnight. A westerly flow will develop Friday morning and is expected to become gusty at KGFL, KALB and KPSF by late morning with gusts into the teens. Outlook... Friday Night: No Operational Impact. NO SIG WX. Saturday: No Operational Impact. NO SIG WX. Saturday Night: Moderate Operational Impact. Chance of SHRA. Sunday: Moderate Operational Impact. Chance of SHRA...TSRA. Sunday Night: Moderate Operational Impact. Chance of SHRA...TSRA. Monday: Moderate Operational Impact. Chance of SHRA...TSRA. Monday Night: Moderate Operational Impact. Chance of SHRA. Tuesday: Moderate Operational Impact. Chance of SHRA...TSRA. && .FIRE WEATHER... Showers and thunderstorms will move across portions of the area this evening, especially south and east of Albany. Then high pressure will build eastward from the Great Lakes Friday into Saturday with dry conditions and slightly above normal temperatures. The next chance of rain arrives Saturday night into Sunday, as a frontal boundary approaches from the west. Relative humidity values will increase to around 90 to 100 percent tonight, dropping to minimum values of 40 to 55 percent on Friday. RH will increase to between 90 and 100 percent again Friday night. Winds tonight will be westerly around 5 mph or less. Winds on Friday will become west-northwest and increase to 10 to 15 mph. Westerly winds will continue Friday night around 5 to 10 mph. && .HYDROLOGY... Some showers and thunderstorms will move across parts of the area this evening, especially south of Albany, as an upper level disturbance moves through the region. Storms are expected to move relatively quickly, so no flooding is anticipated at this time, although brief downpours could result in ponding of water on roads and poor drainage locations. Dry weather will return Friday through Saturday with high pressure building in. Then, another bout of wet weather with additional showers and few thunderstorms expected from Sunday through early next week. 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...JPV NEAR TERM...JPV SHORT TERM...JPV LONG TERM...Speciale AVIATION...IAA FIRE WEATHER...JPV HYDROLOGY...JPV
Hazardous Weather Outlook National Weather Service Albany NY 444 PM EDT Thu Jul 20 2017 CTZ001-013-MAZ001-025-NYZ032-033-038>043-047>054-058>061-063>066- 082>084-VTZ013>015-211100- Northern Litchfield-Southern Litchfield-Northern Berkshire- Southern Berkshire-Northern Herkimer-Hamilton-Southern Herkimer- Southern Fulton-Montgomery-Northern Saratoga-Northern Warren- Northern Washington-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-Northern Fulton-Southeast Warren- Southern Washington-Bennington-Western Windham-Eastern Windham- 444 PM EDT Thu Jul 20 2017 This Hazardous Weather Outlook is for northwestern Connecticut, western Massachusetts, east central New York, eastern New York and southern Vermont. .DAY ONE...Tonight. There is a Marginal Risk of severe thunderstorms into this evening, especially across Ulster, Dutchess and Litchfield counties. A few these storms could produce damaging winds. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a chance of thunderstorms on Monday, mainly in the afternoon and early evening hours. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this evening well south of Albany.
Special Weather Statement
National Weather Service Albany NY
416 PM EDT THU JUL 20 2017
MAZ001-025-202045-
Northern Berkshire-Southern Berkshire-
416 PM EDT THU JUL 20 2017
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL BERKSHIRE COUNTY...
At 415 PM EDT, a strong thunderstorm was located near Middlefield, or
7 miles east of Pittsfield, moving east at 30 mph.
Winds in excess of 30 mph are possible with this storm.
This storm will be near...
Becket around 425 PM EDT.
Other locations impacted by this storm include Barkerville, Windsor,
Washington, New Lenox, Lakeview Terrace, Berkshire, The Boulders, The
Center At Lenox, Dalton and Adams Junction.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4239 7301 4238 7301 4239 7306 4238 7307
4233 7306 4231 7303 4231 7300 4228 7300
4240 7335 4256 7330 4251 7298
TIME...MOT...LOC 2015Z 289DEG 27KT 4244 7311
BGMThe Brookhaven radar (KOKX), 107 km away, was scanning. The volume nearest the first event began at 23:08 UTC.
2 thunderstorm wind. Local standard time, as filed.
A tree branch and wires were downed on Long Hill Road.
Thunderstorm winds resulted in a downed tree and wires near Shenandoah Road and Jackson Road. The live wire prompted a road closure.
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, July 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: 711615, 711616.