Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 55, NWS Buffalo, NY

June 18, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 18, 2017, 5:19 PM EDT for 4 counties in New York. It was in force for 56 min. 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: Jun 18, 2017, 5:19 PM EDT (21:19 UTC)
Expired: Jun 18, 2017, 6:15 PM EDT
In force: 56 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 121 km from the middle of the area, began a volume at 21:23 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, 5:32 PM EDT	TSTM WND DMG	Brighton, NY	LARGE LIMB OR SMALL TREE DOWN VIA TWITTER
Jun 18, 6:04 PM EDT	TSTM WND DMG	Shortsville, NY	WIRES DOWN.
Jun 18, 6:16 PM EDT	TSTM WND DMG	Newark, NY	WIRES DOWN.
Jun 18, 6:24 PM EDT	TSTM WND DMG	Lyons, NY	WIRES 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, 9.3 hours before the alert went out and 118 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.

144 
WUUS51 KBUF 182119
SVRBUF
NYC051-055-069-117-182215-
/O.NEW.KBUF.SV.W.0055.170618T2119Z-170618T2215Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Wayne County in western New York...
  Eastern Livingston County in western New York...
  Eastern Monroe County in western New York...
  Ontario County in western New York...

* Until 615 PM EDT.

* At 519 PM EDT, severe thunderstorms were located along a line
  extending from near Gates-North Gates to near Dansville, moving
  northeast at 50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Rochester, Irondequoit, Geneva, Canandaigua, East Rochester,
  Webster, Fairport and Brighton.

This includes the following highways...
 Interstate 390 near exit 12.
 Interstate 90 between exits 46 and 42.

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 4258 7763 4330 7768 4333 7764 4328 7754
      4332 7735 4333 7714 4331 7697 4334 7691
      4301 7693 4301 7696 4287 7696 4286 7698
      4276 7697 4276 7731 4267 7737 4258 7737
TIME...MOT...LOC 2119Z 237DEG 43KT 4318 7774 4258 7778 

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

HITCHCOCK

2 follow-up statements

908 
WWUS51 KBUF 182154
SVSBUF

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

NYC051-055-069-117-182215-
/O.CON.KBUF.SV.W.0055.000000T0000Z-170618T2215Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
554 PM EDT SUN JUN 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR WAYNE...NORTHEASTERN LIVINGSTON...SOUTHEASTERN MONROE AND ONTARIO
COUNTIES...

At 552 PM EDT, severe thunderstorms were located along a line
extending from near Fairport to near Vine Valley, moving northeast at
40 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Geneva, Canandaigua, East Rochester, Webster, Fairport.

This includes Interstate 90 between exits 45 and 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms may produce widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows.

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

&&

LAT...LON 4269 7760 4320 7758 4332 7735 4333 7714
      4331 7697 4334 7691 4301 7693 4301 7696
      4276 7697 4276 7731 4267 7737
TIME...MOT...LOC 2152Z 228DEG 33KT 4313 7741 4272 7739 

HAIL...<.75IN
WIND...70MPH
 
$$

HITCHCOCK

109 
WWUS51 KBUF 182212
SVSBUF

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

NYC051-055-069-117-182222-
/O.EXP.KBUF.SV.W.0055.000000T0000Z-170618T2215Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
612 PM EDT SUN JUN 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR WAYNE...NORTHEASTERN
LIVINGSTON...SOUTHEASTERN MONROE AND ONTARIO COUNTIES WILL EXPIRE AT
615 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.

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

Remember, new a Severe Thunderstorm Warning still remains in effect 
for portions of Wayne and Ontario counties until 7 PM EDT.

LAT...LON 4269 7760 4320 7758 4332 7735 4333 7714
      4331 7697 4334 7691 4301 7693 4301 7696
      4276 7697 4276 7731 4267 7737
TIME...MOT...LOC 2212Z 270DEG 43KT 4325 7715 4284 7713 

$$

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, 2:41 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	49 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, 5:21 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.