Flash Flooding in New York, May 19, 2011

Name: Flash Flooding in New York, May 19, 2011
Start: 2011-05-19T14:30
End: 2011-05-19T21:00
Location: New York

May 19, 2011 · NWS BGM · 2 events in 2 counties and zones

A slow moving upper level low pressure system brought scattered showers and thunderstorms to upstate New York. Some of the storms brought heavy rainfall, and isolated storms produced flash flooding.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $25,000
Crop damage: None recorded
Events: 2

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.

What happened

The episode as NWS BGM wrote it up.

A slow moving upper level low pressure system brought scattered showers and thunderstorms to upstate New York. Some of the storms brought heavy rainfall, and isolated storms produced flash flooding.

What forecasters said that day

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 19, 1:50 PM EST, 40 minutes earlier.

Area forecast discussion, May 19, 1:50 PM EST, 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BINGHAMTON NY
250 PM EDT THU MAY 19 2011

.SYNOPSIS...
A SLOW MOVING UPPER-LEVEL STORM SYSTEM WILL KEEP UNSETTLED
CONDITIONS OVER THE REGION THROUGH FRIDAY...WITH SLOWLY IMPROVING
WEATHER EXPECTED THIS WEEKEND.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
UPDATE AT 130 PM...HAVE UPDATED THE FORECAST TO INCLUDE A SEVERE
THUNDERSTORM WATCH AND FLASH FLOOD WATCH FOR SOUTHERN AND CENTRAL
PARTS OF THE FORECAST AREA. UPPER LOW SPINNING ACROSS SOUTHERN PA
WITH A BROKEN BAND OF SHOWERS AND THUNDERSTORMS NOW DEVELOPING
ACROSS CENTRAL PA AND MOVING NORTH. STORM MOVEMENT HAS BEEN SLOW
WITH SOME TENDENCY FOR BACK-BUILDING NOTED ON RADAR LOOPS. 3 HR
FLASH FLOOD GUIDANCE IS BETWEEN 1.5 AND 2.0 INCHES IN MOST
AREAS... AND THERE EXISTS THE POTENTIAL FOR SOME OF THESE STORMS
TO PRODUCE THOSE KIND OF RAINFALL TOTALS. IN ADDITION MLCAPE
VALUES BETWEEN 500 AND 1000 J/KG WITH DEEP LAYER SHEAR OF 30 TO 40
KT WILL BE ENOUGH FOR SOME HAIL PRODUCING STORMS... MOSTLY SMALL
HAIL BUT ISOLATED LARGER HAIL POSSIBLE.

.PREVIOUS DISCUSSION 11 AM... HAVE UPDATED THE GRIDS BASED ON
LATEST TRENDS. CLUSTER OF CONVECTIVE SHOWERS IS MOVING NORTH
ACROSS CENTRAL NEW YORK. THIS CLUSTER HAS BEEN ASSOCIATED WITH
SOME BRIEF HEAVY DOWNPOURS BUT RAINFALL AMOUNTS HAVE BEEN LESS
THAN AN INCH AND ARE DIMINISHING WITH TIME. THEREFORE NO FLASH
FLOOD WARNINGS OR STATEMENTS HAVE BEEN ISSUED.

SOME SUNSHINE IS BEING OBSERVED OUTSIDE OF THESE SHOWERS THIS
MORNING AND THIS WILL ALLOW MLCAPES TO CLIMB TO 500-1000 J/KG THIS
AFTERNOON BASED ON MODIFICATION OF 12Z BUF SOUNDING AND LATEST RUC
FORECASTS. LOW-LEVEL WIND FIELD IS QUITE LIGHT BUT DEEP LAYER
SHEAR IS FORECAST TO REACH NEAR 40 KTS THIS AFTERNOON. EXPECT
SHOWERS WITH SCATTERED THUNDERSTORMS TO RE- DEVELOP IN MANY AREAS
BY EARLY THIS AFTERNOON AS THE LARGE UPPER LEVEL CLOSED LOW SPINS
ACROSS SOUTHERN PA. STORMS WILL LIKELY BEGIN AS PULSE TYPE BUT
MODERATELY LARGE DEEP LAYER SHEAR COULD PROMOTE DEVELOPMENT OF A
FEW LARGER CLUSTERS WITH ISOLATED STRONG WINDS AND HAIL. BEST
LOCAL ANALOG FROM OUR DATA BASE WAS A HAIL PRODUCER IN MAY OF
2006.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY/...
TONIGHT...UPPER LEVEL LOW WILL CONTINUE MOVING EAST TOWARD NEW
JERSEY. AFTER THE EARLY EVENING HOURS CONVECTION WILL DIMINISH IN
AREAL COVERAGE WITH JUST LOW CHC POPS AFTER MIDNIGHT. WEAK FLOW
COMBINED WITH ABUNDANT LOW LEVEL MOISTURE WILL MAKE FOR CLOUDY
SKIES AND ANOTHER MILD NIGHT WITH LOWS IN THE LOWER TO MIDDLE 50S.

FRIDAY...SLOW MOVING UPPER LEVEL SYSTEM WILL FINALLY MOVE OFF THE
NEW JERSEY COAST BY LATE DAY. WITH AREA GETTING ON BACK SIDE OF
SYSTEM FORCING WILL BE WEAKER ALONG WITH MOISTURE FEED. WILL
FOLLOW GENERAL DIURNAL TREND WITH POPS INDICATING BEST CHANCES
DURING THE AFTERNOON WITH HIGH CHC POPS. MODEL INDICES SHOW LESS
INSTABILITY THAN TODAY WITH BETTER CHANCE FOR THUNDERSTORMS
PRIMARILY I81 EAST. MAX TEMPS WILL AGAIN RANGE FROM THE UPPER 60S
TO LOWER 70S.

FRIDAY NIGHT...VERTICALLY STACKED SYSTEM WILL CONTINUE MOVING OFF
THE NEW JERSEY/LONG ISLAND COAST GRADUALLY LOSING ITS GRIP ON THE
AREA. WITH LOSS OF DAYTIME HEATING DROPPED POPS TO DRY AFTER
MIDNIGHT. NORTHWEST FLOW ON BACK SIDE WILL RESULT IN GRADUAL DRYING
WITH SKIES BECOMING PARTLY CLOUDY LATE.

SATURDAY/SATURDAY NIGHT...FINALLY A PERIOD OF TRANSITION
EXPECTED BY THE EARLY WEEKEND AS THE STATIONARY UPPER LOW THAT
CONTINUES TO PLAGUE THE REGION FINALLY GETS SHUNTED TO THE EAST.
THIS WILL OCCUR AS YET ANOTHER LARGE UPPER LOW DIGS ACROSS THE
NORTHERN ROCKIES/PLAINS AND RIDGING SETS UP BETWEEN TO TWO
OPPOSING FEATURES. FORECAST MODELS TO INCLUDE BOTH THE GFS AND NAM
SHOW LINGERING SHWRS AND THE POSSIBILITY AN ISO THUNDERSTORM
ACROSS THE AREA ON SATURDAY...BEFORE THE LONG AWAITING DRYING
SPELL BEGINS SAT NIGHT. CURRENT PROGS CALL FOR WIDELY SCT TO SCT
ACTIVITY ACROSS THE REGION ON SAT...SO A TOTAL WASHOUT IS NOT
ANTICIPATED. BY AFTERNOON WE MIGHT EVEN BEGIN SEEING GLIMPSES OF
THE SUN ONCE AGAIN AS DRIER AIR BEGINS ADVECTING IN ALOFT. HAVE
FOLLOWED THE COOLER MET NUMBERS FOR DAYTIME HIGHS SAT AFTERNOON AS
NORTHERLY LOW-LEVEL FLOW WILL LIKELY PREVENT TEMPS FROM WARMING AS
HIGH AS MAV NUMBERS CURRENTLY SUGGEST. LITTLE TO NO SENSIBLE WX
EXPECTED SAT NGT/EARLY SUN AS RIDGING BUILDS IN OVERHEAD.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
AS OF 3 PM EDT...
VRY FEW CHGS TO ONGOING LONG TERM FCST. UL RIDGING VRY EARLY ON IN
THE PD WL FLATTEN AS A STRONG TROF ROTATES THRU THE NRN PLAINS AND
CANADIAN PRAIRIE PROVINCES. FAIRLY FLAT RIDGING WL BE MAINTAINED
ACRS THE REGION THRU TUESDAY WITH SW FLOW AHD OF SYSTEM APPCHG FM
CANADA ALLOWING SOME RISING HEIGHTS. THIS WL SERVE TO KEEP TEMPS
NR TO ABV NORMAL THRU EARLY IN THE WEEK. HWVR THIS WL ALSO KEEP
CHC FOR SHOWERS AND TSTMS IN THRU THE PD. CONVECTION WL GRNLY BE
DIURNALLY DRIVEN THRU THE LONG TERM WITH WX GRIDS INDICATING
THUNDER FM 16Z-03Z EACH PD.

HPC SIDING WITH BLEND OF EC/GFS AS THEY ARE BOTH SIMILAR IN SOLNS.
CDFNT PROGGED TO CROSS THE CWA TUE/TUE NGT TIMEFRAME AND THEN
STALL OUT ALONG ERN SEABOARD DUE TO STRENGTHENING HIGH OFF THE
SOUTHEAST COAST. THIS FRONT WL LKLY COME NORTH AGAIN AS A WMFNT
LATE IN THE PD AS STRONG STORM SYSTEM WINDS UP TO OUR SOUTHWEST.
THUS CONTD CHCS FOR PCPN THRU THE END OF THE LONG TERM. MAX TEMPS
EXPECTED TO GNRLY RANGE IN THE MID-UPR 70S WITH LOWS IN THE 50S.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
UPDATED AS OF 130 PM... SHRA/TSRA DEVELOPING AREA-WIDE THIS AFTN.
CB GROUPS WILL BE CARRIED ALL SITES...WITH TSRA USED INDIVIDUALLY
AS NEEDED.

CONVECTION SHOULD DIMINISH FROM 00-03Z...WITH LOWER CIGS/BR
FOLLOWING OVERNIGHT (MAINLY MVFR/IFR RESTRICTIONS).

VFR SHOULD RETURN BY 14-16Z FRI. SHRA/TSRA AGAIN POSSIBLE FRI
AFTN...BUT LONGER TIME RANGE/UNCERTAIN COVERAGE PRECLUDE THEIR
MENTION AT THIS TIME.

S TO SE WINDS 5-10 KT THIS AFTN...WILL BECOME LIGHT AND VRBL
OVERNIGHT...THEN TURN N TO NW ARND 5 KT FRI.

OUTLOOK...

SATURDAY...MVFR STILL POSSIBLE EARLY...IN LINGERING SHWRS.

SAT NGT TO SUN MORNING...MAINLY VFR.

SUN AFTN TO TUE...MVFR...IN SHOWERS AND POSSIBLE THUNDERSTORMS.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
PA...FLASH FLOOD WATCH UNTIL 11 PM EDT THIS EVENING FOR PAZ038-039-
     043-044-047.
NY...FLASH FLOOD WATCH UNTIL 11 PM EDT THIS EVENING FOR NYZ024-055-
     056.

&&

SYNOPSIS...RRM
NEAR TERM...MSE
SHORT TERM...CMG/RRM
LONG TERM...PVN
AVIATION...MLJ

Hazardous weather outlook, May 19, 12:47 PM EST, 1 hour 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BINGHAMTON NY
147 PM EDT THU MAY 19 2011

NYZ024-055-056-PAZ038-039-043-044-047-201800-
CHEMUNG-TIOGA-BROOME-BRADFORD-SUSQUEHANNA-WYOMING-LACKAWANNA-LUZERNE-
147 PM EDT THU MAY 19 2011

...SEVERE THUNDERSTORM WATCH 307 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK AND
NORTHEAST PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.
   FLASH FLOOD WATCH.

OCCASIONAL SHOWERS WITH ISOLATED THUNDERSTORMS WILL CONTINUE THIS
AFTERNOON INTO THIS EVENING. THE STRONGEST STORMS COULD CONTAIN
HEAVY DOWNPOURS... LARGE HAIL AND STRONG GUSTY WINDS.

STAY TUNED FOR THE LATEST FORECASTS AND UPDATES FROM THE NATIONAL
WEATHER SERVICE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

NYZ009-015>018-036-037-201800-
NORTHERN ONEIDA-YATES-SENECA-SOUTHERN CAYUGA-ONONDAGA-MADISON-
SOUTHERN ONEIDA-
147 PM EDT THU MAY 19 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW YORK.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

OCCASIONAL SHOWERS WITH ISOLATED THUNDERSTORMS WILL CONTINUE THIS
AFTERNOON INTO THIS EVENING. THE STRONGEST STORMS COULD CONTAIN
BRIEF HEAVY DOWNPOURS... HAIL AND GUSTY WINDS.

STAY TUNED FOR THE LATEST FORECASTS AND UPDATES FROM THE NATIONAL
WEATHER SERVICE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

NYZ022-023-025-044>046-057-062-PAZ040-048-072-201800-
STEUBEN-SCHUYLER-TOMPKINS-CORTLAND-CHENANGO-OTSEGO-DELAWARE-SULLIVAN-
NORTHERN WAYNE-PIKE-SOUTHERN WAYNE-
147 PM EDT THU MAY 19 2011

...SEVERE THUNDERSTORM WATCH 307 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW
YORK...SOUTHEASTERN NEW YORK AND NORTHEAST PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

OCCASIONAL SHOWERS WITH ISOLATED THUNDERSTORMS WILL CONTINUE THIS
AFTERNOON INTO THIS EVENING. THE STRONGEST STORMS COULD CONTAIN
BRIEF HEAVY DOWNPOURS... LARGE HAIL AND STRONG GUSTY WINDS.

STAY TUNED FOR THE LATEST FORECASTS AND UPDATES FROM THE NATIONAL
WEATHER SERVICE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

MSE

In the hours before

Special weather statement, May 19, 11:50 AM EST, 2 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1250 PM EDT THU MAY 19 2011

NYZ018-036-191715-
MADISON NY-ONONDAGA NY-
1250 PM EDT THU MAY 19 2011

...STRONG THUNDERSTORM WILL AFFECT EXTREME NORTHWESTERN MADISON AND
NORTHEASTERN ONONDAGA COUNTIES...

* AT 1247 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL...AND VERY
  HEAVY RAIN.  THIS STORM WAS LOCATED NEAR BRIDGEPORT...AND MOVING
  NORTHWEST AT 15 MPH.

* THE STRONG THUNDERSTORM WILL BE NEAR...
  NORTH SYRACUSE AT 1255 PM EDT...
  LOWER SOUTH BAY AT 100 PM EDT...
  CICERO AND LIVERPOOL AT 105 PM EDT...
  WOODARD AT 110 PM EDT...
  BREWERTON AND CLAY AT 115 PM EDT...

OTHER THUNDERSTORMS COVER THE NORTHERN PORTIONS OF ONONDAGA COUNTY
FROM BETWEEN LYSANDER AND PHOENIX...TO BRIDGEPORT. ANY OF THESE
STORMS HAVE THE POTENTIAL TO PRODUCE VERY HEAVY RAINFALL AND HAIL TO
ABOUT ONE HALF INCH IN DIAMETER.

LAT...LON 4323 7609 4321 7607 4318 7594 4312 7589
      4302 7610 4323 7642 4324 7631 4321 7628
      4323 7627 4324 7626 4322 7622 4327 7622
      4328 7619

JAB

Special weather statement, May 19, 12:30 PM EST, 2 hours before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
130 PM EDT THU MAY 19 2011

NYZ055-056-PAZ038-039-191800-
BRADFORD-BROOME-SUSQUEHANNA-TIOGA-
130 PM EDT THU MAY 19 2011

...LOCALLY HEAVY RAINFALL LIKELY THIS AFTERNOON...

AS OF 125 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SEVERAL CLUSTERS OF SLOW MOVING SHOWERS AND THUNDERSTORMS ACROSS THE
TWIN TIERS. THESE STORM CELLS WERE SLOWLY TRACKING NORTH AT BETWEEN
5 TO 10 MPH.

STORMS WERE DEPOSITING A QUICK ONE HALF TO ONE INCH OF RAINFALL IN
LESS THAN AN HOUR TIME. STORMS WILL CONTINUE TO DEVELOP AROUND THE
AREA THROUGH THE AFTERNOON...AND MAY BRING REPEAT ROUNDS OF HEAVY
RAIN TO ANY ONE LOCATION. THIS COULD CAUSE FLOODING OF LOW LYING
AREAS...SMALL STREAMS...CREEKS AND TOWN OR VILLAGE ROADS. BE PREPARED
TO MOVE TO HIGHER GROUND SHOULD FLOODING DEVELOP.

JAB

Special weather statement, May 19, 1:02 PM EST, 1 hour 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
202 PM EDT THU MAY 19 2011

NYZ009-037-191900-
ONEIDA NY-
202 PM EDT THU MAY 19 2011

...LINE OF STRONG THUNDERSTORMS WILL AFFECT ONEIDA COUNTY...

* AT 159 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL...AND
  VERY HEAVY RAIN.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 7 MILES NORTHWEST OF BLOSSVALE TO LEE TO
  WESTMORELAND...AND MOVING NORTH AT 30 MPH.

* STRONG THUNDERSTORMS WILL BE NEAR...
  STEUBEN AND GLENMORE AT 210 PM EDT...
  WESTERNVILLE AND STOKES CORNER AT 215 PM EDT...
  AVA AT 225 PM EDT...
  HAWKINSVILLE AND BOONVILLE AT 230 PM EDT...

THESE STORMS HAVE THE POTENTIAL TO BECOME SEVERE AND PRODUCE LARGE
HAIL AND/OR DAMAGING WINDS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE
INDOORS IMMEDIATELY!

LAT...LON 4301 7532 4342 7585 4348 7581 4343 7553
      4356 7524 4356 7523

MLJ

Special weather statement, May 19, 1:34 PM EST, 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
234 PM EDT THU MAY 19 2011

NYZ009-037-191930-
ONEIDA NY-
234 PM EDT THU MAY 19 2011

...STRONG THUNDERSTORM WILL AFFECT CENTRAL ONEIDA COUNTY...

* AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL...AND VERY
  HEAVY RAIN.  THIS STORM WAS LOCATED NEAR WESTMORELAND...AND MOVING
  NORTHWEST AT 15 MPH.

* THE STRONG THUNDERSTORM WILL BE NEAR...
  STITTVILLE AT 245 PM EDT...
  FLOYD AT 255 PM EDT...
  GRIFFISS AFB AND VERONA AT 305 PM EDT...
  ROME AT 315 PM EDT...
  VERONA MILLS AT 320 PM EDT...
  DELTA LAKE AND NEW LONDON AT 325 PM EDT...
  LEE AND STOKES CORNER AT 330 PM EDT...

THIS STORM HAS THE POTENTIAL TO BECOME SEVERE AND PRODUCE LARGE HAIL
AND/OR DAMAGING WINDS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE
INDOORS IMMEDIATELY!

LAT...LON 4310 7522 4299 7543 4330 7580 4349 7541
      4351 7535

MLJ

Special weather statement, May 19, 2:28 PM EST, 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BINGHAMTON NY
328 PM EDT THU MAY 19 2011

NYZ009-037-192030-
ONEIDA NY-
328 PM EDT THU MAY 19 2011

...LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL ONEIDA COUNTY...

* AT 324 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING SMALL HAIL TO
  THE SIZE OF DIMES...STRONG GUSTY WINDS TO 40 MPH...AND VERY HEAVY
  RAIN.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 9
  MILES NORTHWEST OF DELTA LAKE TO ORISKANY...AND MOVING NORTH AT 20
  MPH. THUNDERSTORMS CONTINUE TO DEVELOP OVER EXTREME SOUTHERN
  ONEIDA COUNTY AND WILL MOVE NORTH OVER THE SAME AREAS OF CENTRAL
  ONEIDA COUNTY OVER THE NEXT HOUR.

* STRONG THUNDERSTORMS WILL BE NEAR...
  FLOYD AND ROME AT 345 PM EDT...
  AVA AT 400 PM EDT...
  WESTERNVILLE AND FRENCHVILLE AT 405 PM EDT...
  NORTH WESTERN AT 410 PM EDT...

THESE STORMS HAVE THE POTENTIAL TO BECOME SEVERE AND PRODUCE LARGE
HAIL AND/OR DAMAGING WINDS.

LAT...LON 4305 7526 4301 7538 4337 7559 4345 7568
      4345 7563 4343 7553 4347 7544 4348 7541

PVN

The radar

The Ft Drum radar (KTYX), 60 km away, was scanning. The volume nearest the first event began at 19:32 UTC.

Open the radar archive at this moment

Event by event

2 flash flood. Local standard time, as filed.

Flash Flood, Oneida

When: May 19, 2:30 PM EST to 9:00 PM EST
Where: Oneida County, 1.22 mi NW of Rome to 1.22 mi N of Elmer Hill
Cause: Heavy Rain
Property damage: $25,000
Reported by: Law Enforcement
Coordinates: 43.230, -75.490

Heavy rain caused flash flooding, especially in the Rome and Oriskany areas. There were reports of water running across roads in the northern sections of Rome and at Griffiths Air Force Base, with water depths over one foot. Numerous roads were also flooded in Oriskany, with water and debris flowing over Airport Road, and a mudslide across Valley Road. Route 69 was closed due to flooding. A cooperative weather observer measured 2.60 inches of rain in a 2.5 hour period at Delta Lake.

Flash Flood, Steuben

When: May 19, 4:00 PM EST to 8:00 PM EST
Where: Steuben County, Caton to 2.76 mi ESE of Caton
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 42.050, -77.030

Water one foot deep was running over Church Creek Road.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in New York in 2011 Every state in 2011 This day in weather history Warnings in New York, May 2011

Sources

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: 305936, 305949.