Locally heavy rain producing thunderstorms moved across Northeast Pennsylvania during the late evening hours of May 1st, 2017.
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 BGM wrote it up.
Locally heavy rain producing thunderstorms moved across Northeast Pennsylvania during the late evening hours of May 1st, 2017.
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 Binghamton, NY wrote its last area forecast discussion before the first event at May 1, 10:12 PM EST, 1 hour 18 minutes earlier.
Area Forecast Discussion National Weather Service Binghamton NY 1112 PM EDT Mon May 1 2017 .SYNOPSIS... Showers and storms associated with a cold front will finally move out of the area overnight. Much cooler air with scattered showers will be across the area Tuesday and Wednesday. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... 11 pm update...The severe weather threat has wound down and and we have cancelled the Severe Thunderstorm Watch for remaining counties. However...at this time, the line has slowed down over NE PA into the Catskills allowing for training cells falling repeatedly over the same area. For this reason, we have hydro concerns...especially over NE PA. The main threat is urban and small stream flooding however localized areas of Flash Flooding can't be ruled out. Expect showers/storms to finally move out of the CWA after 6z as the line slowly collapses south and east. 845 pm update...Line of severe storms continues to sweep east and as of the mid evening affecting areas in the Wyoming Valley of PA north and east into far eastern Broome, Chenango, into Delaware and Otsego Counties. Damaging winds will continue to be the main threat but we still can't rule out tornadoes. Also, hydro will have to be watched as these storms are producing heavy rain but the good news is they are for the most part progressive. Instability has been decreasing somewhat but the shear, dynamics, and kinematics are strong so expect that severe weather will be possible with this line right through the Catskills and Poconos. Storms will exit the forecast area by around midnight. Also, we continue to lop off counties from the watch over western parts of the forecast area as the storms clear these areas. 7 pm update... update for a severe thunderstorm watch rest of area until midnight. Single solid line with stratiform line behind. Behaving but moving slowly east across cwa. Minor changes to grids, mostly temperatures behind line which have dropped to around 60. 330 PM update... Tornado watch now in effect until 10 PM for western three quarters of cwa. Very strong wind fields with speed shear due to increasing winds with height and low level turning. Some clearing ahead of the solid line in western NY/western PA has created low level instability due to surface heating. This will all translate east. Line moves into Steuben between 4 and 5 PM then to SYR around 6 pm, BGM 7/8 PM, AVP 9 PM. In the southeast low level clouds have been slow to erode today keeping it much cooler and also more stable. At this time not sure if a watch will be needed for the far eastern counties. Other problems could be heavy rain. Amounts in the strongest storms over one inch. This could cause minor problems. With this one line being the whole show for now flooding is not expected to be that much. Movement is slow now but some increase in forward speed is expected. Will continue to hold off on a flash flood watch. Late evening into early morning showers end and the front goes through. Colder air slow to move in the lows in the low and mid 50s. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY/... 330 PM Update... A stacked low moves northeast from the Midwest into the Great Lakes Tuesday into Tuesday night. A westerly flow of cool moist air will keep showers across the area this period. The best chance will be in NY. Amounts will be light. Some sun but with the cooler air high temperatures only get to 55 to 60 in NY and around 60 PA Tuesday. Wednesday even colder with highs mostly 50 to 55. Low temperatures Tuesday night around 40. With little clearing and winds at 10 mph, frost is not likely. Rainfall amounts under half an inch with the highest Syracuse/Utica. Near zero for Scranton. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... 335 PM Update... Models disagree on the details but are solid on the overall picture of a large showery upper low dropping over our region and persisting in our vicinity for most of the period. Before the low, a passing surface high Wednesday night will first lead to a brief window of less cloud cover and radiational cooling, resulting in lows in the mid to upper 30s. Some of our coldest pockets could get to around freezing, something to keep in mind for those who have vulnerable plants out early. Upper low then brings an extended period of cool wet weather. On Thursday, moist warm air advection aloft will cause showers to develop. The surface warm front itself will struggle to reach our region, holding highs back to mainly 50s for Thursday and upper 50s-lower 60s Friday. With the low drifting directly overhead, our main batch of rain will be Thursday night through Friday. Periods of showers can then still be expected through the weekend with instability of cold air aloft, and lobes of vorticity pinwheeling around the upper low. All told, easily 1 to 2 inches of rain could be spread out over the Thursday through Sunday period with perhaps locally higher amounts. Not too concerned yet hydrology-wise but something to keep an eye on as details become clearer. At a minimum we can expect some elevated water levels and higher stream flows. Highs will only be in the 50s over the weekend and probably into Monday. && .AVIATION /03Z TUESDAY THROUGH SATURDAY/... As of 2345z, a line of strong thunderstorms was currently crossing the forecast area extending from near BGM north and east to near KRME. Some showers still linger for KSYR/KITH/KELM but the worst of the storms have now pushed east of these sites. Heading through the next couple hours, expect IFR visbys with strong wind gusts as these storms move through KRME/KBGM and later KAVP by 02z. We have indicated wind gusts to 35 knots in the TAFs but there is definitely the potential for stronger gusts...potentially exceeding 50 knots if the strongest part of the cells move over a TAF site. The storms exit by late this evening and in their wake generally expect low end VFR cigs through the remainder of the TAF period. The exception will be KBGM where MVFR cigs may linger overnight. Outlook... Tuesday afternoon through Wednesday night...Mainly VFR but a chance of showers and associated restrictions at times mostly in NY. Thursday through Friday...Restrictions likely with rain from slow-moving low pressure system. Saturday...restrictions possible in showers. && .BGM WATCHES/WARNINGS/ADVISORIES... PA...None. NY...None. && SYNOPSIS...TAC NEAR TERM...PCF/TAC SHORT TERM...TAC LONG TERM...MDP AVIATION...PCF/TAC
Hazardous Weather Outlook National Weather Service Binghamton NY 1055 PM EDT Mon May 1 2017 NYZ057-062-PAZ039-040-043-044-047-048-072-030300- Delaware-Sullivan-Susquehanna-Northern Wayne-Wyoming-Lackawanna- Luzerne-Pike-Southern Wayne- 1055 PM EDT Mon May 1 2017 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Tonight. The Severe Thunderstorm Watch has been cancelled however additional showers and storms will affect the area into the early part of the overnight and a few of these could still produce locally strong, gusty winds. In addition, heavy rain falling repeatedly over the same areas could lead to continuing urban and small stream flooding issues. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions and recent storm damage according to Standard Operating Procedures. NYZ009-015>018-022>025-036-037-044>046-055-056-PAZ038-030300- Northern Oneida-Yates-Seneca-Southern Cayuga-Onondaga-Steuben- Schuyler-Chemung-Tompkins-Madison-Southern Oneida-Cortland-Chenango- Otsego-Tioga-Broome-Bradford- 1055 PM EDT Mon May 1 2017 This Hazardous Weather Outlook is for central New York and northeast Pennsylvania. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report storm damage from Monday's storms according to Standard Operating Procedures.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
856 PM EDT MON MAY 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0856 PM TSTM WND DMG DELHI 42.28N 74.91W
05/01/2017 DELAWARE NY 911 CALL CENTER
NUMEROUS TREES DOWN...POWER LINES DOWN
&&
CJPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
902 PM EDT MON MAY 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM TSTM WND DMG NEW BERLIN 42.62N 75.34W
05/01/2017 CHENANGO NY FACEBOOK
TREES DOWN ON SHACKTOWN MTN. ROAD
&&
JMLPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
913 PM EDT MON MAY 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0815 PM TSTM WND DMG NORWICH 42.53N 75.52W
05/01/2017 CHENANGO NY EMERGENCY MNGR
MULTIPLE TREES DOWN ALSO IN PRESTON... NEW BERLIN...
OXFORD... GUILFORD 815 PM-830 PM.
&&
JMLPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
927 PM EDT MON MAY 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0825 PM TSTM WND DMG GILBERTSVILLE 42.47N 75.32W
05/01/2017 OTSEGO NY AMATEUR RADIO
POSSIBLE TORNADO. TREES DOWN AND OTHER DAMAGE. RADAR
ESTIMATED TIME.
&&
MDPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1009 PM EDT MON MAY 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0825 PM TSTM WND DMG 1 N OXFORD 42.46N 75.60W
05/01/2017 CHENANGO NY FACEBOOK
TREES DOWN... UPROOTED... SHEARED OFF JUST NORTH OF
VILLAGE OF OXFORD
&&
JMLSpecial Weather Statement
National Weather Service Binghamton NY
1211 AM EDT TUE MAY 2 2017
NYZ062-020445-
Sullivan NY-
1211 AM EDT TUE MAY 2 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT...SULLIVAN COUNTY UNTIL
1245 AM EDT...
At 1210 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Jeffersonville to near Bethel to
Narrowsburg. Movement was northeast at 60 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Fallsburg, Monticello, Liberty, Bethel, Neversink, South Fallsburg,
Tusten, Woodridge, Jeffersonville and Parksville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with these storms, and may lead to
minor flooding. Do not drive your vehicle through flooded roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4156 7503 4161 7508 4162 7505 4163 7505
4168 7498 4188 7503 4201 7477 4188 7446
4184 7448 4175 7457 4166 7443
TIME...MOT...LOC 0410Z 238DEG 51KT 4184 7496 4171 7492 4161 7507
BJTThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Locally heavy rains caused minor flooding across portions of Valley View Road in the township of Eaton, PA. Mud and debris were also reported flowing across the road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2017Every state in 2017This day in weather historyWarnings in Pennsylvania, May 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: 701721.