Alert archive / New York / Flash Flood Warnings in 2017

Flash Flood Warning 10, NWS Buffalo, NY

September 5, 2017Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at Sep 5, 2017, 12:07 AM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 5, 2017, 12:07 AM EDT (04:07 UTC)
Expired: Sep 5, 2017, 3:00 AM EDT
In force: 3 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Cattaraugus County, NY, Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 98 km from the middle of the area, began a volume at 04:06 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 4.1 hours before the alert went out and 96 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: 94 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1561 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 515 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

322 
WGUS51 KBUF 050407
FFWBUF
NYC009-013-050700-
/O.NEW.KBUF.FF.W.0010.170905T0407Z-170905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
1207 AM EDT TUE SEP 5 2017

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Southern Cattaraugus County in western New York...
  Southeastern Chautauqua County in western New York...

* Until 300 AM EDT.

* At 1205 AM 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...
  Olean, Salamanca, Allegany State Park, Allegany, St. Bonaventure,
  Weston Mills, Frewsburg and Hinsdale.

This includes Interstate 86 between exits 17 and 27.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

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 4200 7920 4209 7919 4227 7831 4200 7831

$$

Wood

1 follow-up statement

679 
WGUS71 KBUF 050651
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
251 AM EDT TUE SEP 5 2017

NYC009-013-050701-
/O.EXP.KBUF.FF.W.0010.000000T0000Z-170905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cattaraugus NY-Chautauqua NY-
251 AM EDT TUE SEP 5 2017

...THE FLASH FLOOD WARNING FOR SOUTHERN CATTARAUGUS AND SOUTHEASTERN
CHAUTAUQUA COUNTIES WILL EXPIRE AT 300 AM EDT...

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

LAT...LON 4200 7920 4209 7919 4227 7831 4200 7831

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 9:47 PM EDT	Special Marine Warning	BUF		88 min
Sep 4, 10:12 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	63 min
Sep 4, 10:20 PM EDT	Special Weather Statement	BUF	Erie, Genesee, Wyoming	40 min
Sep 4, 10:24 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Orleans, Wyoming	32 min
Sep 4, 10:55 PM EDT	Beach Hazards Statement	BUF	Cayuga, Jefferson, Oswego	12 hr
Sep 4, 10:59 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	61 min
Sep 4, 11:06 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	39 min
Sep 4, 11:08 PM EDT	Special Marine Warning	BUF		52 min
Sep 4, 11:24 PM EDT	Special Marine Warning	BUF		66 min
Sep 4, 11:33 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Sep 4, 11:51 PM EDT	Special Marine Warning	BUF		39 min
Sep 4, 11:57 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	63 min
Sep 5, 12:18 AM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	30 min
Sep 5, 12:24 AM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	21 min
Sep 5, 10:19 AM EDT	Special Marine Warning	BUF		41 min
Sep 5, 10:23 AM EDT	Special Weather Statement	BUF	Allegany	37 min
Sep 5, 10:38 AM EDT	Special Weather Statement	BUF	Allegany	37 min
Sep 5, 5:46 PM EDT	Special Marine Warning	BUF		59 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.