Alert archive / New York / Flash Flood Warnings in 2017

Flash Flood Warning 6, NWS Buffalo, NY

July 23, 2017Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 23, 2017, 3:57 PM EDT for Ontario County, New York. It was in force for 3 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: Jul 23, 2017, 3:57 PM EDT (19:57 UTC)
Expired: Jul 23, 2017, 7:00 PM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Ontario County, NY

The radar

The Binghamton radar (KBGM), 120 km from the middle of the area, began a volume at 19:58 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 23, 4:11 PM EDT	FLASH FLOOD	Canandaigua, NY	2-3 FEET OF WATER REPORTED BY COUNTY SHERIFF IN PARTS OF CITY OF CANANDAIGUA. VEHICLE STUCK NEAR INTERSECTION OF CHARLOTTE AND GORHAM STREETS WITH A PORTION OF ONTARIO STREET FLOODED.
Jul 23, 4:21 PM EDT	FLASH FLOOD	3 Se Canandaigua, NY	COUNTY ROAD 18 PARTIAL WASHOUT IN TOWN OF HOPEWELL
Jul 23, 4:27 PM EDT	FLASH FLOOD	3 S Canandaigua, NY	MULTIPLE SECTIONS OF ROUTE 16 FLOODED ON WEST SIDE OF CANANDAIGUA LAKE

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 127 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: 1092 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

018 
WGUS51 KBUF 231957
FFWBUF
NYC069-232300-
/O.NEW.KBUF.FF.W.0006.170723T1957Z-170723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
357 PM EDT SUN JUL 23 2017

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  East central Ontario County in western New York...

* Until 700 PM EDT.

* At 356 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Canandaigua, Rushville, Gorham, Seneca Castle, Cottage City and
  Hall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4294 7737 4291 7711 4284 7697 4283 7698
      4276 7697 4276 7727

$$

Wood

2 follow-up statements

953 
WGUS71 KBUF 232136
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
536 PM EDT SUN JUL 23 2017

NYC069-232300-
/O.CON.KBUF.FF.W.0006.000000T0000Z-170723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ontario NY-
536 PM EDT SUN JUL 23 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
EAST CENTRAL ONTARIO COUNTY...

At 535 PM EDT, local law enforcement reported flash flooding in and 
around Canandaigua. Over two inches of rain have already fallen. 
Flash flooding is already occurring.

Some locations that will experience flooding include...
Canandaigua, Rushville, Gorham, Seneca Castle, Cottage City and Hall.

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, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

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 4294 7737 4291 7711 4284 7697 4283 7698
      4276 7697 4276 7727

$$

Wood

743 
WGUS71 KBUF 232240
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
640 PM EDT SUN JUL 23 2017

NYC069-232250-
/O.CAN.KBUF.FF.W.0006.000000T0000Z-170723T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ontario NY-
640 PM EDT SUN JUL 23 2017

...THE FLASH FLOOD WARNING FOR EAST CENTRAL ONTARIO COUNTY IS
CANCELLED...

The heavy rain has ended and no additional flooding is expected. 
Please continue to heed any remaining road closures.

LAT...LON 4294 7737 4291 7711 4284 7697 4283 7698
      4276 7697 4276 7727

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 4:31 AM EDT	Beach Hazards Statement	BUF	Monroe, Niagara, Orleans	18 hr
Jul 23, 4:31 AM EDT	Lakeshore Flood Watch	BUF	Monroe, Niagara, Orleans	5 hr
Jul 23, 4:32 AM EDT	Small Craft Advisory	BUF		24 hr
Jul 23, 9:57 AM EDT	Lakeshore Flood Warning	BUF	Monroe, Orleans	19 hr
Jul 23, 1:34 PM EDT	Special Weather Statement	BUF	Allegany	56 min
Jul 23, 2:12 PM EDT	Special Weather Statement	BUF	Ontario	63 min
Jul 23, 2:22 PM EDT	Special Weather Statement	BUF	Allegany	53 min
Jul 23, 2:34 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	56 min
Jul 23, 2:59 PM EDT	Tornado Warning	BUF	Ontario	31 min
Jul 23, 3:28 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	62 min
Jul 23, 3:30 PM EDT	Special Weather Statement	BUF	Genesee	60 min
Jul 23, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Wyoming	41 min
Jul 23, 4:15 PM EDT	Flash Flood Warning	BUF	Genesee, Wyoming	3 hr
Jul 23, 4:38 PM EDT	Special Weather Statement	BUF	Livingston	67 min
Jul 23, 4:59 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario	4 hr
Jul 23, 5:32 PM EDT	Special Weather Statement	BUF	Niagara	88 min
Jul 23, 6:13 PM EDT	Special Marine Warning	BUF		62 min
Jul 23, 6:53 PM EDT	Areal Flood Warning	BUF	Ontario	12 hr

Nearby

Flash Flood Warnings in New York, 2017 Every flash flood warning in 2017

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.