Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 19, NWS Buffalo, NY

May 18, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2017, 3:22 PM EDT for 4 counties in New York. It was in force for 38 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: May 18, 2017, 3:22 PM EDT (19:22 UTC)
Expired: May 18, 2017, 4:00 PM EDT
In force: 38 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 123 km from the middle of the area, began a volume at 19:22 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
May 18, 3:24 PM EDT	HAIL 1	1 N Livonia, NY
May 18, 3:24 PM EDT	HAIL 1	1 Sw South Lima, NY	HALF INCH TO INCH SIZED HAIL.
May 18, 3:35 PM EDT	HAIL 0.5	1 S West Bloomfield, NY	MARBLE SIZED HAIL...TIME ESTIMATED BASED UPON RADAR
May 18, 3:40 PM EDT	HAIL 0.5	1 S West Bloomfield, NY	MARBLE SIZED HAIL...CORRECTED TIME PER OBSERVER

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, 7.4 hours before the alert went out and 120 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: 37 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1826 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

687 
WUUS51 KBUF 181922
SVRBUF
NYC051-055-069-117-182000-
/O.NEW.KBUF.SV.W.0019.170518T1922Z-170518T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
322 PM EDT THU MAY 18 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Wayne County in western New York...
  Northeastern Livingston County in western New York...
  South central Monroe County in western New York...
  Ontario County in western New York...

* Until 400 PM EDT.

* At 321 PM EDT, a severe thunderstorm was located near Hemlock, or
  near Geneseo, moving east at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to trees and power lines. 

* Locations impacted include...
  Geneva, Canandaigua, Newark, Lyons, Palmyra, Victor, Honeoye Falls
  and Bristol.

This includes the following highways...
 Interstate 390 between exits 8 and 10.
 Interstate 90 between exits 44 and 42.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4288 7778 4317 7700 4301 7693 4301 7696
      4287 7696 4286 7698 4285 7698 4275 7772
TIME...MOT...LOC 1921Z 248DEG 39KT 4283 7768 

HAIL...1.00IN
WIND...60MPH
 
$$

Church

2 follow-up statements

414 
WWUS51 KBUF 181936
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
336 PM EDT THU MAY 18 2017

NYC051-055-181945-
/O.CAN.KBUF.SV.W.0019.000000T0000Z-170518T2000Z/
Livingston NY-Monroe NY-
336 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LIVINGSTON AND
SOUTH CENTRAL MONROE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
western New York.

LAT...LON 4293 7756 4295 7752 4294 7748 4296 7748
      4317 7700 4301 7693 4301 7696 4287 7696
      4287 7698 4285 7698 4281 7754
TIME...MOT...LOC 1935Z 248DEG 39KT 4289 7748 

$$

NYC069-117-182000-
/O.CON.KBUF.SV.W.0019.000000T0000Z-170518T2000Z/
Wayne NY-Ontario NY-
336 PM EDT THU MAY 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTH CENTRAL WAYNE AND NORTHERN ONTARIO COUNTIES...

At 335 PM EDT, a severe thunderstorm was located over Bloomfield, or
9 miles west of Canandaigua, moving east at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Trained weather spotters. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Geneva, Canandaigua, Newark, Lyons, Palmyra, Victor, Bristol and
Clifton Springs.

This includes Interstate 90 between exits 44 and 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4293 7756 4295 7752 4294 7748 4296 7748
      4317 7700 4301 7693 4301 7696 4287 7696
      4287 7698 4285 7698 4281 7754
TIME...MOT...LOC 1935Z 248DEG 39KT 4289 7748 

HAIL...1.00IN
WIND...60MPH
 
$$

Church

434 
WWUS51 KBUF 181951
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
351 PM EDT THU MAY 18 2017

NYC069-117-182000-
/O.EXP.KBUF.SV.W.0019.000000T0000Z-170518T2000Z/
Wayne NY-Ontario NY-
351 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WAYNE AND
NORTHERN ONTARIO COUNTIES WILL EXPIRE AT 400 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
western New York.

LAT...LON 4293 7756 4295 7752 4294 7748 4296 7748
      4317 7700 4301 7693 4301 7696 4287 7696
      4287 7698 4285 7698 4281 7754
TIME...MOT...LOC 1950Z 248DEG 39KT 4295 7727 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 1:35 PM EDT	Special Weather Statement	BUF	Chautauqua	25 min
May 18, 1:38 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	52 min
May 18, 2:36 PM EDT	Special Weather Statement	BUF	Wyoming	24 min
May 18, 2:41 PM EDT	Special Weather Statement	BUF	Ontario	34 min
May 18, 3:13 PM EDT	Special Weather Statement	BUF	Wyoming	32 min
May 18, 3:17 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Erie, Wyoming	43 min
May 18, 3:51 PM EDT	Special Weather Statement	BUF	Livingston, Ontario	24 min
May 18, 3:57 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wyoming	48 min
May 18, 4:05 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	40 min
May 18, 4:39 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	51 min
May 18, 5:25 PM EDT	Special Weather Statement	BUF	Cayuga	35 min
May 18, 5:28 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	47 min
May 18, 5:41 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	64 min
May 18, 5:51 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	39 min
May 18, 6:17 PM EDT	Special Weather Statement	BUF	Allegany	28 min
May 18, 6:17 PM EDT	Severe Thunderstorm Warning	BUF	Lewis, Oswego	28 min
May 18, 6:45 PM EDT	Special Weather Statement	BUF	Lewis	45 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.