Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 9, NWS Buffalo, NY

July 8, 2021Monroe County, Wayne County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 8, 2021, 4:53 PM EDT for Monroe County, Wayne County, New York. It was in force for 3 hr. 2 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 8, 2021, 4:53 PM EDT (20:53 UTC)
Expired: Jul 8, 2021, 8:02 PM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Monroe County, NY, Wayne County, NY

The radar

The Buffalo radar (KBUF), 108 km from the middle of the area, began a volume at 20:52 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 8, 5:22 PM EDT	FLASH FLOOD	1 Ese Irondequoit, NY	FLOODING ALONG ROUTE 104 AND 590. LANES CLOSED, WATER RESCUE FROM VEHICLE STRANDED IN WATER.
Jul 8, 6:31 PM EDT	FLASH FLOOD	2 Wsw Irondequoit, NY	DEEP FLOWING WATER COVERING A PORTION OF RIDGEVIEW DRIVE AND DEEP WATER ON TITUS AVE.

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, 8.9 hours before the alert went out and 106 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: 99 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

577 
WGUS51 KBUF 082053
FFWBUF
NYC055-117-090045-
/O.NEW.KBUF.FF.W.0009.210708T2053Z-210709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
453 PM EDT Thu Jul 8 2021

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  East Central Monroe County in western New York...
  Northwestern Wayne County in western New York...

* Until 845 PM EDT.

* At 453 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...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Rochester, Greece, Irondequoit, Webster, Brighton, Gates-North 
  Gates, Charlotte, Rochester General Hospital, Strong Memorial 
  Hospital, Union Hill and Rochester International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4328 7759 4329 7755 4328 7754 4332 7739
      4332 7738 4333 7726 4328 7723 4327 7722
      4306 7765 4316 7782

FLASH FLOOD...RADAR INDICATED

$$

Apffel

2 follow-up statements

935 
WGUS71 KBUF 082212
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
612 PM EDT Thu Jul 8 2021

NYC055-117-090045-
/O.CON.KBUF.FF.W.0009.000000T0000Z-210709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe NY-Wayne NY-
612 PM EDT Thu Jul 8 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT THIS 
EVENING FOR EAST CENTRAL MONROE AND NORTHWESTERN WAYNE COUNTIES...

At 612 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3.5 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Rochester, Greece, Irondequoit, Webster, Brighton, Gates-North 
  Gates, Charlotte, Rochester General Hospital, Union Hill, Strong 
  Memorial Hospital and Rochester International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4328 7758 4329 7755 4328 7754 4331 7744
      4332 7739 4332 7738 4333 7726 4328 7723
      4327 7722 4311 7766 4316 7775

FLASH FLOOD...RADAR INDICATED

$$

Apffel

949 
WGUS71 KBUF 090002
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
802 PM EDT Thu Jul 8 2021

NYC055-117-090012-
/O.CAN.KBUF.FF.W.0009.000000T0000Z-210709T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe NY-Wayne NY-
802 PM EDT Thu Jul 8 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL MONROE AND 
NORTHWESTERN WAYNE COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4328 7758 4329 7755 4328 7754 4331 7744
      4332 7739 4332 7738 4333 7726 4328 7723
      4327 7722 4311 7766 4316 7775

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 8:04 PM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Chautauqua	56 min
Jul 7, 8:39 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jul 8, 12:48 PM EDT	Special Weather Statement	BUF	Niagara	27 min
Jul 8, 1:40 PM EDT	Special Weather Statement	BUF	Niagara	35 min
Jul 8, 2:18 PM EDT	Special Weather Statement	BUF	Orleans	42 min
Jul 8, 3:08 PM EDT	Special Weather Statement	BUF	Niagara	67 min
Jul 8, 3:23 PM EDT	Special Marine Warning	BUF		37 min
Jul 8, 3:34 PM EDT	Special Weather Statement	BUF	Erie	41 min
Jul 8, 3:41 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	48 min
Jul 8, 3:48 PM EDT	Special Marine Warning	BUF		57 min
Jul 8, 4:13 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	32 min
Jul 8, 4:16 PM EDT	Special Weather Statement	BUF	Oswego	44 min
Jul 8, 4:26 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	49 min
Jul 8, 4:29 PM EDT	Special Weather Statement	BUF	Monroe	61 min
Jul 8, 4:37 PM EDT	Special Marine Warning	BUF		53 min
Jul 8, 4:45 PM EDT	Special Weather Statement	BUF	Genesee, Monroe	30 min
Jul 8, 5:09 PM EDT	Special Weather Statement	BUF	Lewis	51 min
Jul 8, 5:12 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	63 min
Jul 8, 6:15 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	60 min
Jul 8, 7:52 PM EDT	Special Weather Statement	BUF	Lewis	38 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.