Heavy rain from thunderstorms resulted in flooding across parts of Litchfield County in northwestern Connecticut on September 29, 2023.
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.
Heavy rain from thunderstorms resulted in flooding across parts of Litchfield County in northwestern Connecticut on September 29, 2023.
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 29, 3:14 PM EST, 6 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Albany NY 414 PM EDT Fri Sep 29 2023 .SYNOPSIS... Rain will taper east of the Hudson River Valley tonight, as a low pressure system moves further off shore. Some scattered showers may linger south and east of Albany Saturday morning. High pressure will build in late in the day with fair and dry weather to close the weekend and for most of next week with seasonable temperatures trending above normal. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... *A Flood Watch continues for Dutchess, and Litchfield Counties through 8 AM Saturday. As of 410 PM EDT...An inverted surface trough associated with low pressure southeast of the Delmarva Region and a H500 closed circulation over NY and PA continues to focus some moderate to heavy rainfall across portions of NW CT and the southern Taconics. Lighter rainfall continues over the Taconics, Berkshires and southern VT with some spotty showers over the southern Dacks. The demarcation between strong 850 hPa moisture transport or enhanced moisture advection has been incredible. Locations in the mid Hudson Valley and NW CT have had the heaviest rainfall 1-3" with locally up to 4" in Litchfield County, CT. Flood Warnings are in effect for the Still River and Housatonic Basin at a few points. PWATS remain 1-2 STDEVs above normal in the 1.2-1.5" range for locations from the Capital Region south and east based on the SPC RAP Meso Analysis. The strong moisture advection continues north/northwest of an inverted sfc trough tonight over New England and portions of the lower to mid Hudson Valley, some showers may back in westward over the southeast Catskills and Capital Region with the upper low overheard we kept slight and low chances of showers in the forecast prior to midnight. We should see the showers diminish to western New England and southeast of the Capital Region after midnight. Lows will be in the mid and upper 40s over the higher terrain and lower to mid 50s in the valleys. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/... *A Flood Watch continues for Ulster, Dutchess, and Litchfield Counties through 8 AM Saturday. The upper low will move gradually move downstream tomorrow with the oceanic cyclone moving further into the north Atlantic. Some pesky showers in the deformation zone may linger through the morning south and east of Albany with clearing skies north and west. Expect a trend to partly to mostly sunny conditions over the forecast area. Max temps will be in the upper 60s to lower 70s over the northern half of the forecast area including the Capital District with some cooler readings over the southern Greens. Expect upper 50s to some upper 60s over the southern half of the forecast area. High pressure builds in from the Great Lakes Region Saturday night with clear/mostly clear skies and light to calm winds. Radiational mist/fog formation is likely in the major river valleys as well as the hollows with lows were forecasted close to the NBM in the 40s to lower 50s. A beautiful close to the weekend with the sfc anticyclone remaining over the eastern Great Lakes Region and southeast Canada. Strong subsidence from the sfc ridge and ridging aloft will yield mostly sunny/sunny conditions with seasonable to above normal temps in the lower to mid 70s in the valleys, and mid 60s to lower 70s over the higher terrain. Another ideal radiational cooling night is expected Sunday night with lows falling off into the 50s some upper 40s over the southern Adirodnacks. && .LONG TERM /MONDAY THROUGH FRIDAY/... The extended forecast will feature mainly fair and dry weather with high pressure in control. The forecast area will be under the influence of an H500 ridge that will fold in over the region in the early to mid week. Low and mid level height anomalies are forecast to be 1-2+ STDEVs above normal on the NAEFS. The high amplitude ridge will be over the East Coast with temps running 10-15 degrees above normal with some records values possibly reached. Highs in the valley areas will be in the upper 70s to lower 80s in the valley Mon- Wed with lows in the 50s. Upper 60s to mid 70s will be possible over the hills and mtn. Thursday into Friday, an upper level trough and a cold front will approach. The guidance varies on the timing with the strong blocking ridge. Most of Thursday will likely be dry, but increasing clouds and a chance of showers will be possible Thu night into Friday. Temps will cool down closer to seasonable October values late in the week. && .AVIATION /20Z FRIDAY THROUGH WEDNESDAY/... Through 18z Saturday....Flight conditions at the terminals are mainly MVFR with KPSF being the outlier with IFR conditions. Moderate to locally heavy rain has persisted over KPOU and KPSF throughout the morning, but a brief dry slot has moved into KPOU where only light showers appear on radar. Weaker reflectivity's can also be seen over KPSF, but light rain still persists there. The axis of heavier rain has shifted to the east, but there remains moderate to heavier bands that will continue to push northward into the region through the afternoon and into this evening. While KALB and KGFL could see some light showers throughout the afternoon and into tonight, their sub-VFR conditions throughout much of the 18z TAF period will primarily be in response to lowered ceiling heights. Models show some batches of moderate to locally heavy rain moving over KPOU and KPSF throughout tonight, but there is a fair amount of differences between the runs. Included TEMPO groups in these TAFs to reflect greater probability of IFR conditions being met as a result of these bands. Otherwise, conditions should mainly meet MVFR thresholds at all terminals. Winds throughout the period will be mainly southeasterly with sustained speeds of 2-5 kt. Outlook... Saturday Night: No Operational Impact. Patchy FG. Sunday to Wednesday: No Operational Impact. NO SIG WX. && .HYDROLOGY... *A Flood Watch continues for Dutchess, and Litchfield Counties through 8 AM Saturday. Locally heavy rain from the mid Hudson Valley and Litchfield Hills is expected through tonight. Rainfall amounts of 1 to 3 inches with localized amounts of 4 inches are possible with rain bands in these areas. Some minor to moderate flooding continues for the Housatonic and Still River basins and at Stevenson and Gaylordsville, as well as Brookfield. Some small creek and stream flooding is possible in NW CT. Flows should recede tomorrow into Sunday with a drier air mass building in. && .ALY WATCHES/WARNINGS/ADVISORIES... CT...Flood Watch through Saturday morning for CTZ001-013. NY...Flood Watch through Saturday morning for NYZ065-066. MA...None. VT...None. && SYNOPSIS...Wasula NEAR TERM...Wasula SHORT TERM...Wasula LONG TERM...Wasula AVIATION...Gant HYDROLOGY...Wasula
Hazardous Weather Outlook National Weather Service Albany NY 431 AM EDT Fri Sep 29 2023 CTZ001-013-NYZ063>066-301100- Northern Litchfield-Southern Litchfield-Western Ulster- Eastern Ulster-Western Dutchess-Eastern Dutchess- 431 AM EDT Fri Sep 29 2023 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... This Hazardous Weather Outlook is for northwestern Connecticut and east central New York. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to relay rainfall amounts and flooding to the National Weather Service in Albany New York. MAZ001-025-NYZ032-033-038>043-047>054-058>061-082>084-VTZ013>015- 301100- 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-Northern Fulton-Southeast Warren- Southern Washington-Bennington-Western Windham-Eastern Windham- 431 AM EDT Fri Sep 29 2023 This Hazardous Weather Outlook is for western Massachusetts, east central New York, eastern New York and southern Vermont. .DAY ONE...Today and tonight. Locally heavy rain is expected today into tonight mainly for areas south south of Albany. Minor flooding of urban, poor drainage and low lying areas is possible, as well as isolated to scattered flash flooding. There is a Marginal to Slight Risk of excessive rainfall during this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Preliminary Local Storm Report
National Weather Service Albany NY
1225 PM EDT Fri Sep 29 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1154 AM Rain Kent 41.72N 73.48W
09/29/2023 M2.00 inch Litchfield CT Trained Spotter
Minor street flooding reported.
&&
Event Number ALY2304575
CSPreliminary Local Storm Report
National Weather Service Albany NY
115 PM EDT Fri Sep 29 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1251 PM Rain Esopus 41.83N 73.97W
09/29/2023 M1.69 inch Ulster NY Trained Spotter
&&
Event Number ALY2304576
CSPreliminary Local Storm Report
National Weather Service Albany NY
123 PM EDT Fri Sep 29 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0122 PM Rain Woodbury 41.54N 73.21W
09/29/2023 M2.71 inch Litchfield CT Emergency Mngr
&&
Event Number ALY2304577
CSPreliminary Local Storm Report
National Weather Service Albany NY
348 PM EDT Fri Sep 29 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0231 PM Rain Red Hook 42.02N 73.88W
09/29/2023 M1.33 Inch Dutchess NY WeatherNet6
WeatherNet6
0312 PM Rain Poughquag 41.61N 73.68W
09/29/2023 M2.43 inch Dutchess NY Trained Spotter
&&
Event Number ALY2304578
Event Number ALY2304579
JPVThe national radar mosaic for the moment the first event began.
3 flood. Local standard time, as filed.
Route 317 was closed between Bear Hill Road and Hollow Road. Water from the Pomperaug River was over the road.
Summer Street in Torrington was closed due to flooding.
Carpenter, Dings, and Maple Hollow Roads were all closed in the Bakersville section of New Hartford due to street flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Connecticut in 2023Every state in 2023This day in weather historyWarnings in Connecticut, September 2023
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: 1143449, 1143450, 1143454.