Alert archive / New York / Flash Flood Warnings in 2016

Flash Flood Warning 9, NWS Buffalo, NY

September 18, 2016Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 18, 2016, 12:23 AM EDT for Allegany County, Cattaraugus 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
Sep 18, 2016, 12:23 AM EDT (04:23 UTC)
Expired
Sep 18, 2016, 3:30 AM EDT
In force
3 hr
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Flood severity
None

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 92 km from the middle of the area, began a volume at 04:27 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
Sep 18, 1:00 AM EDTFLASH FLOODAllegany, NYFLOODED BASEMENTS REPORTED IN ALLEGANY.
Sep 18, 1:00 AM EDTFLASH FLOODHinsdale, NYMULTIPLE ROAD CLOSURES AROUND HINSDALE DUE TO FLASH FLOODING IN ADDITION TO FLOODED BASEMENTS IN HINSDALE.
Sep 18, 1:30 AM EDTFLASH FLOOD1 Wsw Friendship, NYCOUNTY ROAD 20 CLOSED. WATER RESCUE ONGOING.
Sep 18, 3:00 AM EDTFLASH FLOODCuba, NYEVACUATIONS ONGOING IN CUBA DUE TO FLOODING.

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 00:00Z, 4.4 hours before the alert went out and 89 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 00:00Z on 2016-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 211 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 00:00Z on 2016-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 square meters per square second.19395878Sfc1 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
211 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
631 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted.

013 
WGUS51 KBUF 180423
FFWBUF
NYC003-009-180730-
/O.NEW.KBUF.FF.W.0009.160918T0423Z-160918T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1223 AM EDT SUN SEP 18 2016

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN CATTARAUGUS COUNTY IN WESTERN NEW YORK...
  WEST CENTRAL ALLEGANY COUNTY IN WESTERN NEW YORK...

* UNTIL 330 AM EDT.

* AT 1222 AM EDT...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE
  WARNED AREA. OVER TWO INCHES OF RAIN HAVE ALREADY FALLEN WITH AN
  ADDITIONAL INCH OR MORE OF RAIN POSSIBLE. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OLEAN...ALLEGANY...CUBA...ST. BONAVENTURE...WESTON MILLS...
  HINSDALE...FRIENDSHIP AND BELMONT.

THIS INCLUDES INTERSTATE 86 BETWEEN EXITS 24 AND 31.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

&&

LAT...LON 4206 7855 4223 7863 4235 7796 4220 7787

$$

WOOD
2 follow-up statements
142 
WGUS71 KBUF 180540
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
140 AM EDT SUN SEP 18 2016

NYC003-009-180730-
/O.CON.KBUF.FF.W.0009.000000T0000Z-160918T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-ALLEGANY NY-
140 AM EDT SUN SEP 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT FOR
SOUTHEASTERN CATTARAUGUS AND WEST CENTRAL ALLEGANY COUNTIES...

AT 136 AM EDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING IN
SEVERAL LOCATIONS INCLUDING HINSDALE. IN ADDITION COUNTY ROAD 20 IN
ALLEGANY COUNTY BETWEEN CUBA AND FRIENDSHIP HAS BEEN CLOSED DUE TO
FLOODING. BETWEEN THREE AND FOUR INCHES OF RAIN HAVE ALREADY FALLEN
ACROSS THE AFFECTED AREAS. FLASH FLOODING IS ALREADY OCCURRING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
OLEAN...ALLEGANY...CUBA...ST. BONAVENTURE...WESTON MILLS...
HINSDALE...FRIENDSHIP AND BELMONT.

THIS INCLUDES INTERSTATE 86 BETWEEN EXITS 24 AND 31.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

&&

LAT...LON 4206 7855 4223 7863 4235 7796 4220 7787

$$

WOOD
242 
WGUS71 KBUF 180731
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
331 AM EDT SUN SEP 18 2016

NYC003-009-180739-
/O.EXP.KBUF.FF.W.0009.000000T0000Z-160918T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-ALLEGANY NY-
331 AM EDT SUN SEP 18 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN CATTARAUGUS AND WEST
CENTRAL ALLEGANY COUNTIES WILL EXPIRE AT 330 AM EDT...

THE HEAVY RAIN HAS ENDED. WHILE THE FLASH FLOODING THREAT HAS
ENDED...THERE CONTINUE TO BE MULTIPLE AREAS UNDER WATER ACROSS THE
AFFECTED AREAS AND A FLOOD WARNING IS IN EFFECT FOR THE AREA. PLEASE
CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4206 7855 4223 7863 4235 7796 4220 7787

$$

WOOD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 9:39 PM EDTSpecial Weather StatementBUFAllegany, Cattaraugus, Livingston, Ontario66 min
Sep 18, 3:29 AM EDTAreal Flood WarningBUFAllegany, Cattaraugus3 hr
Sep 18, 6:04 PM EDTSpecial Weather StatementBUFOswego26 min

Nearby

Flash Flood Warnings in New York, 2016Every flash flood warning in 2016

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.