Alert archive / New York / Flash Flood Warnings in 2015

Flash Flood Warning 30, NWS Buffalo, NY

August 18, 2015Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Aug 18, 2015, 3:53 PM EDT for Ontario 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: Aug 18, 2015, 3:53 PM EDT (19:53 UTC)
Expired: Aug 18, 2015, 6:45 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), 119 km from the middle of the area, began a volume at 19:53 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 12:00Z, 7.9 hours before the alert went out and 126 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: 234 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1139 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 29 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

177 
WGUS51 KBUF 181953
FFWBUF
NYC069-182245-
/O.NEW.KBUF.FF.W.0030.150818T1953Z-150818T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
353 PM EDT TUE AUG 18 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ONTARIO COUNTY IN WESTERN NEW YORK...

* UNTIL 645 PM EDT
    
* AT 349 PM EDT...DOPPLER RADAR INDICATED MULTIPLE CLUSTERS OF 
  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...
  GENEVA...CANANDAIGUA...CLIFTON SPRINGS...PHELPS...RUSHVILLE...
  FARMINGTON...GORHAM AND MANCHESTER.

ADDITIONAL RAINFALL RATES OF TWO OR MORE INCHES PER HOUR ARE 
POSSIBLE IN THE WARNED AREA AS ANOTHER CLUSTER OF STORMS APPROACHES 
FROM YATES COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4299 7733 4295 7696 4287 7696 4287 7698
      4286 7698 4284 7697 4276 7697 4276 7731
      4271 7735 4268 7736 4269 7736

$$

SMITH

1 follow-up statement

493 
WGUS71 KBUF 182125
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
525 PM EDT TUE AUG 18 2015

NYC069-182135-
/O.CAN.KBUF.FF.W.0030.000000T0000Z-150818T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ONTARIO NY-
525 PM EDT TUE AUG 18 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN ONTARIO COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 4299 7733 4295 7696 4287 7696 4287 7698
      4286 7698 4284 7697 4276 7697 4276 7731
      4271 7735 4268 7736 4269 7736

$$

REYNOLDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 10:42 AM EDT	Flash Flood Watch	BUF	Allegany, Cayuga, Livingston, Monroe, Ontario, Wayne	9 hr
Aug 18, 11:13 AM EDT	Special Weather Statement	BUF	Erie	32 min
Aug 18, 2:46 PM EDT	Special Weather Statement	BUF	Oswego	59 min
Aug 18, 2:57 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	42 min
Aug 18, 3:38 PM EDT	Special Weather Statement	BUF	Ontario, Wayne	3 hr
Aug 18, 4:24 PM EDT	Special Weather Statement	BUF	Oswego	66 min
Aug 18, 4:37 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	53 min
Aug 18, 4:44 PM EDT	Special Weather Statement	BUF	Wayne	61 min
Aug 18, 5:01 PM EDT	Special Marine Warning	BUF		59 min
Aug 18, 5:45 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	45 min
Aug 18, 7:16 PM EDT	Special Weather Statement	BUF	Jefferson	29 min

Nearby

Flash Flood Warnings in New York, 2015 Every flash flood warning in 2015

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.