Alert archive / New York / Flash Flood Warnings in 2015

Flash Flood Warning 3, NWS Buffalo, NY

May 10, 2015Livingston County, Monroe County, New York

NWS Buffalo, NY issued this flash flood warning at May 10, 2015, 3:58 PM EDT for Livingston County, Monroe County, New York. It was in force for 3 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 10, 2015, 3:58 PM EDT (19:58 UTC)
Expired
May 10, 2015, 7:00 PM EDT
In force
3 hr
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

Counties Livingston County, NY, Monroe County, NY

The radar

The Buffalo radar (KBUF), 86 km from the middle of the area, began a volume at 19:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
May 10, 4:31 PM EDTFLASH FLOOD1 Sse Avon, NYPOLE BRIDGE RD AND LAKE RD CLOSED.
May 10, 4:35 PM EDTFLASH FLOOD1 Sw Avon, NYREPORT OF RESCUES FOR PEOPLE TRAPPED IN STALLED CARS IN FLOODED AREAS.
May 10, 5:25 PM EDTFLASH FLOODAvon, NYFLOODING AT SAINT AGNES SCHOOL
May 10, 5:30 PM EDTFLASH FLOOD1 Sw Ashantee, NYBOYD RD FLOODED AND IMPASSABLE FROM A SMALL CREEK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.0 hours before the alert went out and 83 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2015-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2015-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
13 J/kg
Mixed-layer CIN
-186 J/kg
Mixed-layer LCL
1320 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

788 
WGUS51 KBUF 101958
FFWBUF
NYC051-055-102300-
/O.NEW.KBUF.FF.W.0003.150510T1958Z-150510T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
358 PM EDT SUN MAY 10 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN LIVINGSTON COUNTY IN WESTERN NEW YORK...
  SOUTH CENTRAL MONROE COUNTY IN WESTERN NEW YORK...

* UNTIL 700 PM EDT
    
* AT 354 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  VERY HEAVY RAIN ACROSS NORTHERN LIVINGSTON COUNTY NEAR AVON 
  EXTENDING NORTHEAST INTO MONROE COUNTY NEAR RUSH. UP TO TWO INCHES 
  OF RAIN HAVE ALREADY FALLEN WITH ADDITIONAL AMOUNTS OF UP TO AN 
  INCH. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  AVON...PIFFARD...HONEOYE FALLS...LIMA...MENDON...RUSH AND YORK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD 
DEATHS OCCUR IN VEHICLES. FLASH FLOODING CAN RESULT IN RAPID RISES 
IN SMALL STREAMS AND FLOODING IN URBAN AREAS.

&&

LAT...LON 4276 7794 4289 7791 4309 7757 4300 7748
      4298 7749 4294 7753 4294 7758 4292 7756
      4287 7762 4276 7785

$$

HITCHCOCK
2 follow-up statements
507 
WGUS71 KBUF 102050
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
450 PM EDT SUN MAY 10 2015

NYC051-055-102300-
/O.CON.KBUF.FF.W.0003.000000T0000Z-150510T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-MONROE NY-
450 PM EDT SUN MAY 10 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
NORTHERN LIVINGSTON AND SOUTH CENTRAL MONROE COUNTIES...

AT 443 PM EDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING IN 
AVON. AROUND THREE INCHES OF RAIN HAS ALREADY FALLEN. FLASH FLOODING 
IS OCCURRING WITH SEVERAL ROADS CLOSED IN AVON AND VICINITY AREAS. 
FLOODING WILL CONTINUE EVEN AFTER THE RAINFALL HAS ENDED. 

ADDITIONAL RAINFALL AMOUNTS OF AROUND A QUARTER OF AN INCH IS 
EXPECTED THROUGH EARLY EVENING IN THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4276 7794 4289 7791 4309 7757 4300 7748
      4298 7749 4294 7753 4294 7758 4292 7756
      4287 7762 4276 7785

$$

THOMAS
573 
WGUS71 KBUF 102258
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
658 PM EDT SUN MAY 10 2015

NYC051-055-102305-
/O.EXP.KBUF.FF.W.0003.000000T0000Z-150510T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON NY-MONROE NY-
658 PM EDT SUN MAY 10 2015

...THE FLASH FLOOD WARNING FOR NORTHERN LIVINGSTON AND SOUTH CENTRAL
MONROE COUNTIES WILL EXPIRE AT 700 PM EDT...

WHILE THE HEAVY RAIN FROM RECENT THUNDERSTORMS HAS ENDED...THE FLASH 
FLOOD WARNING WILL BE TRANSITIONED TO A LOCALIZED FLOOD WARNING FOR 
CONTINUED STORM RUNOFF. 

LAT...LON 4276 7794 4289 7791 4309 7757 4300 7748
      4298 7749 4294 7753 4294 7758 4292 7756
      4287 7762 4276 7785

$$

THOMAS

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 3:10 PM EDTSpecial Weather StatementBUFGenesee35 min
May 10, 3:28 PM EDTSpecial Weather StatementBUFOntario47 min
May 10, 4:14 PM EDTSpecial Weather StatementBUFWayne46 min
May 10, 4:45 PM EDTSevere Thunderstorm WarningBUFOntario30 min
May 10, 6:04 PM EDTSpecial Weather StatementBUFChautauqua41 min
May 10, 6:54 PM EDTAreal Flood WarningBUFLivingston3 hr

Nearby

Flash Flood Warnings in New York, 2015Every flash flood warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.