Alert archive / New York / Flash Flood Warnings in 2021

Flash Flood Warning 6, NWS Buffalo, NY

July 1, 2021Genesee County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 1, 2021, 10:28 PM EDT for Genesee County, New York. It was in force for 93 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 1, 2021, 10:28 PM EDT (02:28 UTC)
Expired: Jul 2, 2021, 12:01 AM EDT
In force: 93 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Genesee County, NY

The radar

The Buffalo radar (KBUF), 38 km from the middle of the area, began a volume at 02:26 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, 2.5 hours before the alert went out and 36 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: 222 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1345 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -63 m²/s²
0-3 km storm-relative helicity: -59 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

As transmitted.

527 
WGUS51 KBUF 020228
FFWBUF
NYC037-020530-
/O.NEW.KBUF.FF.W.0006.210702T0228Z-210702T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
1028 PM EDT Thu Jul 1 2021

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Central Genesee County in western New York...

* Until 130 AM EDT.

* At 1028 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar estimated that 2 to 3 
  inches of rain has already fallen over the warned area and an 
  additional half to one inch of rain will be possible. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Batavia, Oakfield and East Pembroke.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4298 7833 4306 7831 4306 7815 4296 7817
      4296 7834

FLASH FLOOD...RADAR INDICATED

$$

RSH

1 follow-up statement

411 
WGUS71 KBUF 020401
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1201 AM EDT Fri Jul 2 2021

NYC037-020411-
/O.CAN.KBUF.FF.W.0006.000000T0000Z-210702T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Genesee NY-
1201 AM EDT Fri Jul 2 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL GENESEE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

LAT...LON 4298 7833 4306 7831 4306 7815 4296 7817
      4296 7834

$$

SJW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 8:15 PM EDT	Special Weather Statement	BUF	Livingston	30 min
Jul 1, 8:45 PM EDT	Special Weather Statement	BUF	Niagara	30 min
Jul 1, 9:50 PM EDT	Special Weather Statement	BUF	Genesee, Orleans	40 min
Jul 2, 8:44 AM EDT	Special Weather Statement	BUF	Jefferson, Lewis, Oswego	2 hr
Jul 2, 10:00 AM EDT	Special Weather Statement	BUF	Chautauqua	90 min
Jul 2, 10:31 AM EDT	Special Weather Statement	BUF	Erie	44 min
Jul 2, 11:12 AM EDT	Special Weather Statement	BUF	Wayne	2 hr
Jul 2, 11:27 AM EDT	Special Weather Statement	BUF	Cattaraugus, Chautauqua, Erie	2 hr
Jul 2, 12:38 PM EDT	Special Weather Statement	BUF	Genesee, Livingston, Monroe, Orleans, Wyoming	112 min
Jul 2, 1:16 PM EDT	Special Marine Warning	BUF		44 min
Jul 2, 1:36 PM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Chautauqua, Erie	114 min
Jul 2, 2:20 PM EDT	Special Weather Statement	BUF	Niagara, Orleans	115 min
Jul 2, 2:26 PM EDT	Special Marine Warning	BUF		34 min
Jul 2, 5:02 PM EDT	Special Weather Statement	BUF	Allegany	58 min

Nearby

Flash Flood Warnings in New York, 2021 Every flash 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.