Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 2, NWS Buffalo, NY

June 9, 2021Cattaraugus County, New York

NWS Buffalo, NY issued this flash flood warning at Jun 9, 2021, 4:00 PM EDT for Cattaraugus County, New York. It was in force for 3 hr. 1 report 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: Jun 9, 2021, 4:00 PM EDT (20:00 UTC)
Expired: Jun 9, 2021, 7:00 PM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 78 km from the middle of the area, began a volume at 20:04 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
Jun 9, 5:15 PM EDT	FLASH FLOOD	2 Se Ellicottville, NY	ROUTE 219 FLOODED IN FRONT OF DOLLAR GENERAL.

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 76 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: 68 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

775 
WGUS51 KBUF 092000
FFWBUF
NYC009-092300-
/O.NEW.KBUF.FF.W.0002.210609T2000Z-210609T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
400 PM EDT Wed Jun 9 2021

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Central Cattaraugus County in western New York...

* Until 700 PM EDT.

* At 359 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Salamanca, Allegany State Park, Great Valley and Ellicottville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 4229 7861 4231 7858 4225 7854 4214 7873
      4218 7881 4221 7880 4225 7872 4228 7865

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 3 HOURS 

$$

HSK

1 follow-up statement

162 
WGUS71 KBUF 092133
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
533 PM EDT Wed Jun 9 2021

NYC009-092300-
/O.CON.KBUF.FF.W.0002.000000T0000Z-210609T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cattaraugus NY-
533 PM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING 
FOR CENTRAL CATTARAUGUS COUNTY...

At 533 PM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 2 and 3 inches 
of rain have fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Salamanca, Allegany State Park, Great Valley and Ellicottville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 4229 7861 4231 7858 4225 7854 4214 7873
      4218 7881 4221 7880 4225 7872 4228 7865

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR AND 30 MINUTES

$$

HSK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 1:28 PM EDT	Special Weather Statement	BUF	Cattaraugus	92 min
Jun 9, 2:33 PM EDT	Special Weather Statement	BUF	Allegany	27 min
Jun 9, 2:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	25 min
Jun 9, 3:02 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	43 min
Jun 9, 3:09 PM EDT	Special Weather Statement	BUF	Cattaraugus	66 min
Jun 9, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	57 min
Jun 9, 3:32 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jun 9, 4:14 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	61 min
Jun 9, 4:35 PM EDT	Special Weather Statement	BUF	Chautauqua	40 min
Jun 9, 5:04 PM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
Jun 9, 5:13 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	47 min
Jun 9, 5:41 PM EDT	Special Weather Statement	BUF	Cattaraugus	64 min
Jun 9, 5:56 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	33 min
Jun 9, 6:22 PM EDT	Flash Flood Warning	BUF	Cattaraugus	116 min

Nearby

Flash Flood Warnings in New York, 2021 Every flash flood warning in 2021

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.