Alert archive / New York / Flash Flood Warnings in 2015

Flash Flood Warning 31, NWS Buffalo, NY

August 20, 2015Livingston County, Monroe County, Ontario County, New York

NWS Buffalo, NY issued this flash flood warning at Aug 20, 2015, 3:08 PM EDT for Livingston County, Monroe County, Ontario County, New York. It was in force for 4 hr. 4 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: Aug 20, 2015, 3:08 PM EDT (19:08 UTC)
Expired: Aug 20, 2015, 7:15 PM EDT
In force: 4 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

Counties Livingston County, NY, Monroe County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 90 km from the middle of the area, began a volume at 19:08 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
Aug 20, 3:34 PM EDT	FLASH FLOOD	Rochester, NY	UNDERPASS AT NORTH UNION STREET AT PUBLIC MARKET UNDER WATER.
Aug 20, 4:00 PM EDT	FLASH FLOOD	1 Ne West Brighton, NY	FLOODING IN OPERATING ROOM AND KITCHEN AT HIGHLAND HOSPITAL
Aug 20, 4:00 PM EDT	FLASH FLOOD	Rochester, NY	NUMEROUS UNDERPASSES FLOODED. SOME CARS STUCK.
Aug 20, 4:10 PM EDT	FLASH FLOOD	1 Se Gates Center, NY	3 FEET OF WATER ON RENOUF DR

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, 7.1 hours before the alert went out and 87 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: 182 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1027 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

317 
WGUS51 KBUF 201908
FFWBUF
NYC051-055-069-202315-
/O.NEW.KBUF.FF.W.0031.150820T1908Z-150820T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
308 PM EDT THU AUG 20 2015

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN ONTARIO COUNTY IN WESTERN NEW YORK...
  CENTRAL LIVINGSTON COUNTY IN WESTERN NEW YORK...
  CENTRAL MONROE COUNTY IN WESTERN NEW YORK...

* UNTIL 715 PM EDT
    
* AT 308 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  TORRENTIAL RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED 
  TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ROCHESTER...GREECE...IRONDEQUOIT...CHILI...GENESEO...EAST
  ROCHESTER...BRIGHTON AND GATES-NORTH GATES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

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

&&

LAT...LON 4265 7789 4334 7776 4333 7772 4332 7771
      4332 7773 4331 7771 4331 7769 4328 7766
      4324 7756 4323 7753 4325 7751 4326 7744
      4263 7754

$$

FRANKLIN

1 follow-up statement

594 
WGUS71 KBUF 202132
FFSBUF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
532 PM EDT THU AUG 20 2015

NYC051-055-069-202142-
/O.CAN.KBUF.FF.W.0031.000000T0000Z-150820T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ONTARIO NY-LIVINGSTON NY-MONROE NY-
532 PM EDT THU AUG 20 2015

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

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

LAT...LON 4265 7789 4334 7776 4333 7772 4332 7771
      4332 7773 4331 7771 4331 7769 4328 7766
      4324 7756 4323 7753 4325 7751 4326 7744
      4263 7754

$$

ZAFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 6:30 AM EDT	Special Weather Statement	BUF	Erie	30 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.