Alert archive / New York / Flash Flood Warnings in 2018

Flash Flood Warning 12, NWS Buffalo, NY

July 24, 2018Chautauqua County, New York

NWS Buffalo, NY issued this flash flood warning at Jul 24, 2018, 8:42 PM EDT for Chautauqua County, New York. It was in force for 2 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: Jul 24, 2018, 8:42 PM EDT (00:42 UTC)
Expired: Jul 24, 2018, 10:55 PM EDT
In force: 2 hr
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Flood severity: None

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 109 km from the middle of the area, began a volume at 00:42 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, 0.7 hours before the alert went out and 109 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: 599 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

249 
WGUS51 KBUF 250042
FFWBUF
NYC013-250345-
/O.NEW.KBUF.FF.W.0012.180725T0042Z-180725T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Buffalo NY
842 PM EDT TUE JUL 24 2018

The National Weather Service in Buffalo has issued a

* Flash Flood Warning for...
  Southwestern Chautauqua County in western New York...

* Until 1145 PM EDT.

* At 841 PM 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...
  Sherman, Mayville, Clymer, Findley Lake, Chautauqua Institute.

Additional rainfall amounts of one to one and a half inches are 
possible in the warned area.

This includes the following highways...
 Interstate 90 near exit 60.
 Interstate 86 between exits 4 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4214 7976 4232 7966 4243 7943 4224 7948
      4223 7929 4200 7948 4200 7976

$$

Hitchcock

2 follow-up statements

383 
WGUS71 KBUF 250145
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
945 PM EDT TUE JUL 24 2018

NYC013-250345-
/O.CON.KBUF.FF.W.0012.000000T0000Z-180725T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chautauqua NY-
945 PM EDT TUE JUL 24 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
SOUTHWESTERN CHAUTAUQUA COUNTY...

At 943 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Up to two inches of rain have already 
fallen, with some additional rainfall expected through late evening. 
Flash flooding is expected to begin shortly.

Some locations that will experience flooding include...
Sherman, Mayville, Clymer, Findley Lake, Chautauqua Institute.

This includes the following highways...
 Interstate 90 near exit 60.
 Interstate 86 between exits 6 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4217 7973 4229 7964 4238 7954 4243 7943
      4224 7948 4223 7929 4200 7948 4200 7976

$$

Hitchcock

799 
WGUS71 KBUF 250255
FFSBUF

Flash Flood Statement
National Weather Service Buffalo NY
1055 PM EDT TUE JUL 24 2018

NYC013-250304-
/O.CAN.KBUF.FF.W.0012.000000T0000Z-180725T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chautauqua NY-
1055 PM EDT TUE JUL 24 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CHAUTAUQUA COUNTY IS
CANCELLED...

Trained spotters reported flood waters have receded. Flooding is no 
longer expected to pose a threat. Please continue to heed any 
remaining road closures.

LAT...LON 4217 7973 4229 7964 4238 7954 4243 7943
      4224 7948 4223 7929 4200 7948 4200 7976

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 11:54 PM EDT	Special Weather Statement	BUF	Chautauqua	66 min
Jul 25, 2:07 AM EDT	Special Weather Statement	BUF	Cattaraugus, Genesee, Wyoming	38 min

Nearby

Flash Flood Warnings in New York, 2018 Every flash flood warning in 2018

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.