Alert archive / New York / Flash Flood Warnings in 2017

Flash Flood Warning 8, NWS Buffalo, NY

July 23, 2017Livingston County, Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 23, 2017, 4:59 PM EDT for Livingston County, Ontario County, New York. It was in force for 4 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: Jul 23, 2017, 4:59 PM EDT (20:59 UTC)
Expired: Jul 23, 2017, 9:00 PM EDT
In force: 4 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 101 km from the middle of the area, began a volume at 21:03 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, 5:00 PM EDT	FLASH FLOOD	2 Nne Canadice, NY	ROAD CLOSURES ON CR 36 BETWEEN HONEOYE AND JERSEY HILL RD.

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, 9.0 hours before the alert went out and 98 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.

900 
WGUS51 KBUF 232059
FFWBUF
NYC051-069-240100-
/O.NEW.KBUF.FF.W.0008.170723T2059Z-170724T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Central Livingston County in western New York...
  Southwestern Ontario County in western New York...

* Until 900 PM EDT.

* At 459 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. One to two inches of rain have 
  already fallen and an additional one to two inches are expected. 
  Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Geneseo, Conesus, Bristol, Naples, Honeoye, Hemlock, York and
  Groveland.

This includes Interstate 390 between exits 6 and 9.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4258 7757 4260 7784 4275 7786 4276 7795
      4289 7796 4284 7730 4276 7727 4276 7731
      4271 7735 4267 7736 4267 7737 4258 7737

$$

Church

1 follow-up statement

212 
WGUS71 KBUF 232242
FFSBUF

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

NYC051-069-232251-
/O.CAN.KBUF.FF.W.0008.000000T0000Z-170724T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Livingston NY-Ontario NY-
642 PM EDT SUN JUL 23 2017

...THE FLASH FLOOD WARNING FOR CENTRAL LIVINGSTON AND SOUTHWESTERN
ONTARIO COUNTIES IS CANCELLED...

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

LAT...LON 4258 7757 4260 7784 4275 7786 4276 7795
      4289 7796 4284 7730 4276 7727 4276 7731
      4271 7735 4267 7736 4267 7737 4258 7737

$$

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, 3:57 PM EDT	Flash Flood Warning	BUF	Ontario	3 hr
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, 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.