Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 47, NWS Buffalo, NY

June 18, 2017Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 18, 2017, 2:41 PM EDT for Chautauqua County, New York. It was in force for 49 min. 2 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: Jun 18, 2017, 2:41 PM EDT (18:41 UTC)
Expired: Jun 18, 2017, 3:30 PM EDT
In force: 49 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 102 km from the middle of the area, began a volume at 18:42 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.

What was reported inside it

Time	Report	Where	Remark
Jun 18, 3:20 PM EDT	TSTM WND DMG	3 N Sherman, NY	TREE DOWN ON SHERMAN-WESTFIELD ROAD
Jun 18, 3:30 PM EDT	TSTM WND DMG	2 Ne Panama, NY	TREES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.7 hours before the alert went out and 103 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: 199 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

505 
WUUS51 KBUF 181841
SVRBUF
NYC013-181930-
/O.NEW.KBUF.SV.W.0047.170618T1841Z-170618T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
241 PM EDT SUN JUN 18 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Western Chautauqua County in western New York...

* Until 330 PM EDT.

* At 241 PM EDT, severe thunderstorms were located along a line
  extending from near North East to near Union City, moving northeast
  at 55 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect wind damage to trees and power lines. 

* Locations impacted include...
  Westfield, Mayville, Clymer, Lake Erie State Park, Findley Lake,
  Long Point State Park, Chautauqua Institute and Chautauqua.

This includes the following highways...
 Interstate 90 between exits 61 and 60.
 Interstate 86 between exits 4 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4244 7950 4252 7940 4200 7939 4200 7976
      4227 7976 4228 7973 4231 7977
TIME...MOT...LOC 1841Z 234DEG 47KT 4228 7981 4193 7984 

HAIL...<.75IN
WIND...60MPH
 
$$

HITCHCOCK

2 follow-up statements

286 
WWUS51 KBUF 181902
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
302 PM EDT SUN JUN 18 2017

NYC013-181930-
/O.CON.KBUF.SV.W.0047.000000T0000Z-170618T1930Z/
Chautauqua NY-
302 PM EDT SUN JUN 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR WESTERN CHAUTAUQUA COUNTY...

At 302 PM EDT, severe thunderstorms were located along a line
extending from near Westfield to Clymer, moving northeast at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect wind damage to trees and power lines. 

Locations impacted include...
Westfield, Mayville, Clymer, Lake Erie State Park, Findley Lake, Long
Point State Park, Chautauqua Institute and Chautauqua.

This includes the following highways...
 Interstate 90 between exits 61 and 60.
 Interstate 86 between exits 4 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4244 7950 4252 7940 4200 7939 4200 7976
      4227 7976 4228 7973 4231 7977
TIME...MOT...LOC 1902Z 233DEG 40KT 4240 7955 4205 7964 

HAIL...<.75IN
WIND...60MPH
 
$$

HITCHCOCK

641 
WWUS51 KBUF 181933
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
333 PM EDT SUN JUN 18 2017

NYC013-181943-
/O.EXP.KBUF.SV.W.0047.000000T0000Z-170618T1930Z/
Chautauqua NY-
333 PM EDT SUN JUN 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CHAUTAUQUA COUNTY HAS
EXPIRED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A severe thunderstorm watch remains in effect until 900 PM EDT for
western New York.

LAT...LON 4244 7950 4252 7940 4200 7939 4200 7976
      4227 7976 4228 7973 4231 7977
TIME...MOT...LOC 1933Z 234DEG 47KT 4240 7955 4205 7964 

$$

HITCHCOCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 10:50 PM EDT	Flash Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Jefferson and 7 more	22 hr
Jun 18, 2:07 PM EDT	Special Weather Statement	BUF	Chautauqua	38 min
Jun 18, 2:14 PM EDT	Special Marine Warning	BUF		61 min
Jun 18, 2:23 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	37 min
Jun 18, 2:24 PM EDT	Special Marine Warning	BUF		66 min
Jun 18, 2:37 PM EDT	Special Weather Statement	BUF	Wayne	53 min
Jun 18, 3:04 PM EDT	Special Marine Warning	BUF		86 min
Jun 18, 3:27 PM EDT	Special Marine Warning	BUF		63 min
Jun 18, 3:45 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	60 min
Jun 18, 3:53 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Erie, Wyoming	67 min
Jun 18, 4:05 PM EDT	Special Weather Statement	BUF	Oswego	40 min
Jun 18, 4:29 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Orleans	31 min
Jun 18, 4:40 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	65 min
Jun 18, 4:49 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Wyoming	56 min
Jun 18, 4:53 PM EDT	Special Weather Statement	BUF	Lewis	67 min
Jun 18, 4:54 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Wyoming	51 min
Jun 18, 5:14 PM EDT	Special Weather Statement	BUF	Lewis	61 min
Jun 18, 5:16 PM EDT	Severe Thunderstorm Warning	BUF	Lewis	59 min
Jun 18, 5:19 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	56 min
Jun 18, 5:21 PM EDT	Special Marine Warning	BUF		54 min
Jun 18, 5:28 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston, Wyoming	47 min
Jun 18, 5:46 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	59 min
Jun 18, 6:01 PM EDT	Special Marine Warning	BUF		59 min
Jun 18, 6:11 PM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	49 min
Jun 18, 6:30 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	45 min
Jun 18, 6:41 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	64 min
Jun 18, 6:44 PM EDT	Special Marine Warning	BUF		61 min
Jun 18, 7:02 PM EDT	Special Marine Warning	BUF		28 min
Jun 18, 7:13 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	62 min
Jun 18, 7:36 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	54 min

Nearby

Severe Thunderstorm Warnings in New York, 2017 Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.