Alert archive / New York / Areal Flood Warnings in 2021

Areal Flood Warning 9, NWS Buffalo, NY

July 17, 2021Livingston County, Ontario County, New York

NWS Buffalo, NY issued this areal flood warning at Jul 17, 2021, 5:15 PM EDT for Livingston County, Ontario 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 17, 2021, 5:15 PM EDT (21:15 UTC)
Expired: Jul 17, 2021, 8:15 PM EDT
In force: 3 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), 107 km from the middle of the area, began a volume at 21:14 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, 6:15 PM EDT	FLOOD	1 S Honeoye, NY	PORTIONS OF COUNTY ROAD 36 CLOSED IN HONEOYE, ALONG HONEOYE LAKE.
Jul 17, 6:15 PM EDT	FLOOD	1 W Honeoye, NY	COUNTY ROAD 37 CLOSED IN HONEOYE.

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, 9.3 hours before the alert went out and 103 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.

292 
WGUS41 KBUF 172115
FLWBUF

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

NYC051-069-180015-
/O.NEW.KBUF.FA.W.0009.210717T2115Z-210718T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Livingston NY-Ontario NY-
515 PM EDT Sat Jul 17 2021

The National Weather Service in Buffalo has issued a

* Flood Warning for...
  East Central Livingston County in western New York...
  Western Ontario County in western New York...

* Until 815 PM EDT.

* At 515 PM EDT, local law enforcement reported flooding and 
  numerous road closures in the warned area. Flooding is ongoing or 
  expected to begin shortly.

* Some locations that will experience flooding include...
  Canandaigua, Victor, Bristol, Bloomfield, Honeoye, Hemlock, 
  Farmington, East Bloomfield, Manchester, Canadice, Holcomb, 
  Bristol Mountain and Cheshire.

Additional rainfall amounts up to 0.5 inches 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 4268 7763 4272 7765 4275 7765 4298 7745
      4303 7739 4303 7725 4294 7724 4287 7725
      4279 7729 4270 7735 4268 7742 4267 7756

$$

JJR

1 follow-up statement

288 
WGUS81 KBUF 180006
FLSBUF

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

NYC051-069-180016-
/O.EXP.KBUF.FA.W.0009.000000T0000Z-210718T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Livingston NY-Ontario NY-
806 PM EDT Sat Jul 17 2021

...FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR EAST 
CENTRAL LIVINGSTON AND WESTERN ONTARIO COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4268 7763 4272 7765 4275 7765 4298 7745
      4303 7739 4303 7725 4294 7724 4287 7725
      4279 7729 4270 7735 4268 7742 4267 7756

$$

JJR

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, 5:28 PM EDT	Areal Flood Warning	BUF	Allegany, Cattaraugus	5 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.