Alert archive / New York / Areal Flood Warnings in 2021

Areal Flood Warning 10, NWS Buffalo, NY

July 17, 2021Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this areal flood warning at Jul 17, 2021, 5:28 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 5 hr. 5 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: Jul 17, 2021, 5:28 PM EDT (21:28 UTC)
Expired: Jul 17, 2021, 10:30 PM EDT
In force: 5 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), 87 km from the middle of the area, began a volume at 21:27 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

Time	Report	Where	Remark
Jul 17, 7:17 PM EDT	FLOOD	Ischua, NY	ROUTE 446 EASTBOUND/WESTBOUND IS CLOSED BETWEEN KINNEY HOLLOW ROAD AND WEST SHORE ROAD IN THE TOWN OF ISCHUA DUE TO FLOODING. REPORTED BY NITTEC.
Jul 17, 7:30 PM EDT	FLOOD	3 N Richburg, NY	FLOODING IN WIRT.
Jul 17, 7:30 PM EDT	FLOOD	Cuba, NY	FLOODING IN CUBA.
Jul 17, 7:30 PM EDT	FLOOD	Little Genesee, NY	FLOODING IN GENESEE.
Jul 17, 7:30 PM EDT	FLOOD	Scio, NY	FLOODING IN SCIO.

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, 9.5 hours before the alert went out and 84 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 558 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

012 
WGUS41 KBUF 172128
FLWBUF

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Buffalo NY
528 PM EDT Sat Jul 17 2021

NYC003-009-180030-
/O.NEW.KBUF.FA.W.0010.210717T2128Z-210718T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-Cattaraugus NY-
528 PM EDT Sat Jul 17 2021

The National Weather Service in Buffalo has issued a

* Flood Warning for...
  Allegany County in western New York...
  Southeastern Cattaraugus County in western New York...

* Until 830 PM EDT.

* At 528 PM EDT, Doppler radar indicated heavy rain. Flooding is 
  ongoing or expected to begin shortly in the warned area. Between 1 
  and 2 inches of rain have fallen.

* Some locations that will experience flooding include...
  Olean, Wellsville, Alfred, Allegany, Franklinville, Belfast, Cuba, 
  Rushford, Houghton, Weston Mills, St. Bonaventure, Whitesville, 
  Caneadea, Hinsdale, Friendship, Scio, Bolivar, Andover, Portville 
  and Belmont.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4201 7860 4236 7847 4252 7831 4252 7785
      4247 7784 4247 7772 4200 7775

$$

SJW

2 follow-up statements

852 
WGUS41 KBUF 180024
FLWBUF

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Buffalo NY
824 PM EDT Sat Jul 17 2021

NYC003-009-180230-
/O.EXT.KBUF.FA.W.0010.000000T0000Z-210718T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-Cattaraugus NY-
824 PM EDT Sat Jul 17 2021

The National Weather Service in Buffalo has extended the

* Flood Warning for...
  Allegany County in western New York...
  Southeastern Cattaraugus County in western New York...

* Until 1030 PM EDT.

* At 824 PM EDT, local law enforcement reported ongoing flooding 
  across the warned area. Between 1 and 2 inches of rain have 
  fallen. Rain has mostly moved out of the area, but flooding will 
  continue to be an issue over the next few hours.

* Some locations that will experience flooding include...
  Olean, Wellsville, Alfred, Allegany, Franklinville, Belfast, Cuba, 
  Rushford, Houghton, Weston Mills, St. Bonaventure, Whitesville, 
  Caneadea, Hinsdale, Friendship, Scio, Bolivar, Andover, Portville 
  and Belmont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4201 7860 4236 7847 4252 7831 4252 7785
      4247 7784 4247 7772 4200 7775

$$

SJW

290 
WGUS81 KBUF 180224
FLSBUF

Flood Statement
National Weather Service Buffalo NY
1024 PM EDT Sat Jul 17 2021

NYC003-009-180234-
/O.EXP.KBUF.FA.W.0010.000000T0000Z-210718T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allegany NY-Cattaraugus NY-
1024 PM EDT Sat Jul 17 2021

...FLOOD WARNING WILL EXPIRE AT 1030 PM EDT THIS EVENING FOR 
ALLEGANY AND SOUTHEASTERN CATTARAUGUS COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat, however, streams and creeks will continue to run high before 
gradually receding tonight. Please continue to heed remaining road 
closures.

LAT...LON 4201 7860 4236 7847 4252 7831 4252 7785
      4247 7784 4247 7772 4200 7775

$$

SJW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 4:15 AM EDT	Beach Hazards Statement	BUF	Chautauqua, Monroe, Niagara, Orleans, Wayne	32 hr
Jul 17, 4:42 AM EDT	Special Weather Statement	BUF	Chautauqua	48 min
Jul 17, 6:12 AM EDT	Areal Flood Warning	BUF	Erie, Genesee, Livingston, Monroe, Niagara, Orleans and 1 more	13 hr
Jul 17, 7:39 AM EDT	Special Weather Statement	BUF	Chautauqua	36 min
Jul 17, 7:59 AM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
Jul 17, 9:11 AM EDT	Areal Flood Warning	BUF	Chautauqua	3 hr
Jul 17, 1:48 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	42 min
Jul 17, 2:10 PM EDT	Areal Flood Warning	BUF	Monroe	40 hr
Jul 17, 3:15 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Erie	6 hr
Jul 17, 3:15 PM EDT	Tornado Warning	BUF	Cattaraugus, Erie	30 min
Jul 17, 3:46 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Wyoming	44 min
Jul 17, 4:30 PM EDT	Special Weather Statement	BUF	Livingston	45 min
Jul 17, 4:35 PM EDT	River Flood Warning	BUF	Cattaraugus, Chautauqua, Erie, Wyoming	10 hr
Jul 17, 5:15 PM EDT	Areal Flood Warning	BUF	Livingston, Ontario	3 hr

Nearby

Areal Flood Warnings in New York, 2021 Every areal 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.