A strong low pressure system tracked up the East Coast bringing moderate to locally heavy rainfall across the region on April 30, continuing into the overnight hours on May 1. Rainfall amounts were generally in the 1 to 2 inch range with some localized areas receiving 3 inches.
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 strong low pressure system tracked up the East Coast bringing moderate to locally heavy rainfall across the region on April 30, continuing into the overnight hours on May 1. Rainfall amounts were generally in the 1 to 2 inch range with some localized areas receiving 3 inches. This rainfall was enough to result in some minor flooding across portions of eastern New York, mostly ponding of water on roads or flooding in poor drainage areas.
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 Apr 30, 9:25 PM EST, 2 hours 35 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Albany NY 1025 PM EDT Sun Apr 30 2023 .SYNOPSIS... Periods of rain, heavy at times, will continue through tonight before tapering off from south to north toward daybreak Monday. It will remain cool and showery for much of the upcoming week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... Flood Watch in effect through 2 am for Ulster and Greene Counties... Wind Advisory has been cancelled... .UPDATE...As of 1025 PM EDT, an upper-level low continues to slowly track eastward across the Great Lakes while a potent, upper-level shortwave rotates around the main low across the northeast. A rather seasonably strong area of low pressure (986 hPa per latest RAP analysis) is tracking northward toward Long Island. An inverted trough is located just to the west of our area closer to the I-81 corridor. Overall, strong forcing from all of these features is resulting in widespread rainfall, which will continue through much of the overnight hours. A convective band of showers and thunderstorms is lifting northward and approaching Long Island and will then move into southern areas around and shortly after midnight. Here, rainfall rates may increase to 0.50 to 1.00 inches per hour for a short time and may result in some localized minor flooding in urban and poor drainage areas. Despite a decrease in precipitation intensity, we have extended the current flood advisory for portions of the mid-Hudson Valley and eastern Catskills as we anticipate this convective band to impact the area shortly, which could increase minor flooding problems in the area once again. We will also keep the flood watch as is until it expires at 2 am, though, areas across Dutchess and Litchfield counties should be on alert for some possible minor flooding with the approaching convective band. Elsewhere, we still expect this rainfall to lead to little if any hydrological issues. Wind speeds across portions of western New England and the Taconics of eastern New York have generally been in the 30 to 40 mph range. With the nose of the low-level jet now lifting northward out of our area, wind speeds are expected to slowly trend downward through the remainder of the night. As we have not observed any wind advisory criteria winds (46 mph or greater), we have cancelled the wind advisory an hour earlier than its original expiration time. Precipitation will begin to taper off from south to north during the overnight and early morning hours on Monday. With the clouds and the rain, temperatures will hold fairly steady tonight in the 40s with some upper 30s across some of the higher terrain. && .SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... Monday, subsidence behind the shortwave trough rapidly translating north of the area, combined with midlevel dry air, should result in a dry start to the day. However, the combination of midlevel cold advection and diurnal heating should allow showers to quickly develop during the afternoon hours as shallow instability develops. The most widespread showers will be located north of I-88 and west of I-87 where the midlevel cold pool will be strongest (700 mb temps falling to minus-10C). Equilibrium levels will be rather high at around 15 kft, so isolated thunderstorms producing graupel or small hail will be possible. Highs are expected to range from the upper 40s to low 60s. The showers and isolated storms are expected to wane Monday evening, but coverage will likely increase again late Monday night as a shortwave trough pinwheels into the area around the upper low wobbling around just north of Lake Ontario. Lows Monday night should range from the mid-30s to mid-40s with a few snowflakes possible in the higher elevations. Tuesday, the upper low will remain rather stationary in the vicinity of the local area thanks to an evolving omega block over the CONUS. Associated midlevel cold pool combined with diurnal heating will result in numerous to widespread showers and isolated storms, with coverage likely better than Monday over most areas. It should be cooler than Monday with highs only reaching the mid-40s to mid-50s. Scattered rain and high- terrain snow showers will continue Tuesday night with lows in the low 30s to low 40s. Little to no accumulation is expected. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... Upper cutoff low and associated midlevel cold pool are expected to remain over the local area at least Wed/Thu thanks to an omega block over most of the CONUS, keeping temps on the cool side and showers prevalent. Numerous to widespread showers expected again on Wednesday, especially during the afternoon and evening as weak diurnal instability develops. 700 mb temps continue to average around minus-10C, which is -1 to -2 standard deviations. The midlevels may warm slightly Thursday as the core of the cutoff low shifts east, so showers may be a bit less widespread compared with Wednesday, but scattered to numerous showers can still be expected. Highs both days are likely to be in the 40s and 50s. For Friday into next weekend, there are some signals that the blocky pattern breaks down somewhat, with higher midlevel heights gradually building in. There is uncertainty as to how quickly this happens, however. At least isolated to widely scattered showers remain possible Fri/Sat, and will trend the forecast mainly dry by Sun. Temps will increase as well, possibly back to near seasonal normals over the weekend with highs mainly in the 50s and 60s. && .AVIATION /02Z MONDAY THROUGH FRIDAY/... Through 00z Tuesday...While there are a few pockets of VFR vsbys/cigs this evening, seeing mostly MVFR and some IFR conditions. Expecting conditions to deteriorate over the next few hours as additional moderate to heavy rain moves in from the south. GFL may stay low-end MVFR, but expecting IFR vsbys/cigs with moderate to heavy rain at ALB/POU/PSF from late this evening through around 8- 10z tomorrow morning. Rain tapers to showers late tonight/early tomorrow morning, and improvement back to VFR conditions is expected after 12z tomorrow at ALB/POU/GFL and after 15z at PSF. VFR conditions prevail through the rest of the day, although additional scattered "pop-up" showers are expected tomorrow afternoon. Will use VCSH and prob 30 groups at all TAF sites to highlight brief MVFR vsby and possibly cig restrictions in these showers. Winds will be at 5-10 kt from the east/northeast tonight, with some gusts of 15-20 kt possible. Between 6-9z, winds switch abruptly to the west/southwest behind a frontal passage. Note that there is some uncertainty in the exact timing of the wind switch, and it is possible this wind shift could occur an hour or two earlier than the current TAFs indicate. Tomorrow morning, winds will be at around 10 kt with some gusts to 20 kt from the southwest. Winds become more southerly tomorrow afternoon still at around 10 kt with some 20 kt gusts. Included low-level wind shear at POU and PSF this evening with a strong low-level jet overhead. ALB and GFL will come close, but likely fall just short of LLWS criteria. However, at these sites winds between 2000-3000 ft will likely be at 40-50 kt from the east/southeast this evening through 3-4z before diminishing afterwards. Outlook... Monday Night: Moderate Operational Impact. Likely SHRA...TSRA. Tuesday: High Operational Impact. Definite SHRA...TSRA. Tuesday Night: Moderate Operational Impact. Chance of SHRA. Wednesday: High Operational Impact. Definite SHRA. Wednesday Night: Moderate Operational Impact. Chance of SHRA. Thursday: Moderate Operational Impact. Chance of SHRA. Thursday Night: Low Operational Impact. Slight Chance of SHRA. Friday: Low Operational Impact. Slight Chance of SHRA. && .HYDROLOGY... A stronger storm system will bring moderate to possibly heavy rainfall through tonight. It appears this next round will bring 0.75 to 2.00 inches of rain in most areas, with higher amounts of 1.50 to 3.00 inches over easterly aspects of the eastern Catskills and southern Greens. Furthermore, elevated instability will cause brief heavy downpours this evening. This rainfall could result in minor urban and poor drainage flooding. Most rivers are forecast to crest below flood stage on Monday, but a few spots along the Schroon, West Canada, Schoharie, Esopus, Rondout, and Housatonic may get close to minor flood stage. A Flood Watch was issued for Greene and Ulster Counties to account for the heavy upslope rainfall in the Catskills and rises on the creeks and streams draining the Catskills. This area was preconditioned a bit by 1-1.5 inches of rain over the last 48 hours. Overall, do not expect this to be a major or widespread flood event, but at least some flooding is possible, especially in small creeks and streams, urban areas, and typical low lying spots. 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...Flood Watch until 2 AM EDT Monday for NYZ058-059-063-064. MA...None. VT...None. && SYNOPSIS...Thompson/Rathbun NEAR TERM...Thompson/Rathbun SHORT TERM...Thompson LONG TERM...Thompson AVIATION...Main HYDROLOGY...Thompson
Hazardous Weather Outlook National Weather Service Albany NY 1029 PM EDT Sun Apr 30 2023 CTZ001-013-MAZ001-025-NYZ032-033-038>043-047>054-060-061-065-066- 082>084-VTZ013>015-011100- 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 Columbia- Eastern Columbia-Western Dutchess-Eastern Dutchess-Northern Fulton- Southeast Warren-Southern Washington-Bennington-Western Windham- Eastern Windham- 1029 PM EDT Sun Apr 30 2023 This Hazardous Weather Outlook is for northwestern Connecticut, western Massachusetts, eastern New York and southern Vermont. .DAY ONE...Tonight. Widespread moderate to locally heavy rainfall is expected through tonight. Some minor flooding in urban and poor drainage areas is possible. .DAYS TWO THROUGH SEVEN...Monday through Saturday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ058-059-063-064-011100- Western Greene-Eastern Greene-Western Ulster-Eastern Ulster- 1029 PM EDT Sun Apr 30 2023 ...FLOOD WATCH IN EFFECT UNTIL 2 AM EDT MONDAY... This Hazardous Weather Outlook is for eastern New York. .DAY ONE...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...Monday through Saturday. There is a low probability for widespread hazardous weather. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to relay rainfall amounts and flooding to the National Weather Service in Albany New York.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ALBANY NY
815 PM EDT SUN APR 30 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0758 PM FLOOD 2 NNE LAKE KATRINE 42.01N 73.98W
04/30/2023 ULSTER NY SOCIAL MEDIA
REPORT OF PONDING OF WATER ON RTE 9W AS WELL AS SOME
SIDE ROADS BETWEEN SAUGERTIES AND KINGSTON
&&
EVENT NUMBER ALY2302685
MEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ALBANY NY
819 PM EDT SUN APR 30 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0650 PM FLOOD STONE RIDGE 41.84N 74.15W
04/30/2023 ULSTER NY TRAINED SPOTTER
PONDING OF WATER OBSERVED ON SOME ROADS IN STONE RIDGE
&&
EVENT NUMBER ALY2302686
RATHBUNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ALBANY NY
850 PM EDT SUN APR 30 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM FLOOD 1 ENE JEFFERSON HEIGHTS 42.25N 73.85W
04/30/2023 GREENE NY TRAINED SPOTTER
REPORT OF MINOR POOR DRAINAGE FLOODING AND STANDING
WATER ON ROADWAYS NEAR CATSKILL.
&&
EVENT NUMBER ALY2302687
RATHBUNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ALBANY NY
1118 PM EDT SUN APR 30 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1104 PM HEAVY RAIN STONE RIDGE 41.84N 74.15W
04/30/2023 M2.70 INCH ULSTER NY TRAINED SPOTTER
&&
EVENT NUMBER ALY2302688
JPVThe national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Ponding of water on roads was observed in the Hamlet of Stone Ridge within the Town of Marbletown.
Ponding of water was observed along Route 9W and some side roads between Saugerties and Kingston.
Minor poor drainage flooding and standing water on roadways was reported near the Village of Catskill.
Mapletown Road, Shunk Road, and White Road were closed due to flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New York in 2023Every state in 2023This day in weather historyWarnings in New York, May 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: 1099075, 1099076, 1099077, 1099074.