Alert archive / New York / Flash Flood Warnings in 2013

Flash Flood Warning 1, NWS Buffalo, NY

May 28, 2013Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at May 28, 2013, 10:03 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 4 hr. 3 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 28, 2013, 10:03 PM EDT (02:03 UTC)
Expired: May 29, 2013, 2:00 AM EDT
In force: 4 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Cattaraugus County, NY, Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 97 km from the middle of the area, began a volume at 02:04 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

Time	Report	Where	Remark
May 28, 10:10 PM EDT	FLASH FLOOD	1 E Randolph, NY	ROAD FLOODED IN EAST RANDOLPH.
May 28, 10:10 PM EDT	FLASH FLOOD	2 N Jamestown, NY	WASHOUT ON MOON ROAD AND HORTON ROAD.
May 28, 10:10 PM EDT	FLASH FLOOD	2 Nw Sinclairville, NY	WASHOUT ON MOON ROAD.

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, 2.1 hours before the alert went out and 96 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 147 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 758 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

862 
WGUS51 KBUF 290203
FFWBUF
NYC009-013-290600-
/O.NEW.KBUF.FF.W.0001.130529T0203Z-130529T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
1003 PM EDT TUE MAY 28 2013

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CATTARAUGUS COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITIES OF...SALAMANCA...OLEAN...
  CHAUTAUQUA COUNTY IN WESTERN NEW YORK...
  THIS INCLUDES THE CITY OF JAMESTOWN...

* UNTIL 200 AM EDT

* AT 959 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. AROUDN AN 
  INCH OF RAIN HAS ALREADY FALLEN...WITH AN ADDITIONAL INCH OF RAIN  
  EXPECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 4199 7976 4225 7977 4244 7943 4238 7863
      4200 7832

$$

APFFEL

1 follow-up statement

750 
WGUS71 KBUF 290237
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
1037 PM EDT TUE MAY 28 2013

NYC009-013-290600-
/O.CON.KBUF.FF.W.0001.000000T0000Z-130529T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATTARAUGUS NY-CHAUTAUQUA NY-
1037 PM EDT TUE MAY 28 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM EDT FOR
CHAUTAUQUA AND CATTARAUGUS COUNTIES...

AT 1015 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A THUNDERSTORM 
PRODUCING FLASH FLOODING JUST NORTH OF JAMESTOWN ON MOON ROAD AND 
HORTON ROAD. IN ADDITION TO ONGOING FLOODING...THUNDERSTORMS WILL 
CONTINUE TO MOVE ACROSS THE REGION. WITH MORE RAIN ON THE 
WAY...ADDITIONAL FLOODING IS LIKELY. TYPICALLY...JAMESTOWN IS 
VULNERABLE TO URBAN FLOODING...BUT HEAVY RAINFALL CAN CAUSE FLASH 
FLOODING ANYWHERES WARNING AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 4199 7976 4225 7977 4244 7943 4238 7863
      4200 7832

$$

APFFEL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 9:00 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	45 min
May 28, 9:44 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	61 min
May 28, 10:10 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	50 min
May 28, 11:28 PM EDT	Small Craft Advisory	BUF		17 hr
May 29, 4:11 PM EDT	Tornado Warning	BUF	Cayuga, Wayne	34 min

Nearby

Flash Flood Warnings in New York, 2013 Every flash flood warning in 2013

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.