Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Buffalo, NY

May 18, 2017Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2017, 4:05 PM EDT for Ontario County, New York. It was in force for 40 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: May 18, 2017, 4:05 PM EDT (20:05 UTC)
Expired: May 18, 2017, 4:45 PM EDT
In force: 40 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Ontario County, NY

The radar

The Binghamton radar (KBGM), 122 km from the middle of the area, began a volume at 20:05 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, 4:12 PM EDT	HAIL 1.25	3 Sse Phelps, NY	TIME ESTIMATED FROM RADAR
May 18, 4:41 PM EDT	TSTM WND DMG	Geneva, NY	LARGE TREE BRANCHES DOWN BLOCKING HALF OF ST. CLAIR STREET.

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
May 18, 3:36 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.1 hours before the alert went out and 122 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.

740 
WUUS51 KBUF 182005
SVRBUF
NYC069-182045-
/O.NEW.KBUF.SV.W.0021.170518T2005Z-170518T2045Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northern Ontario County in western New York...

* Until 445 PM EDT.

* At 404 PM EDT, a severe thunderstorm was located near Vine Valley,
  or 9 miles south of Canandaigua, moving east at 40 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. 

* Locations impacted include...
  Geneva, Canandaigua, Clifton Springs, Phelps, Rushville, Gorham,
  Seneca Lake State Park and Seneca Castle.

This includes Interstate 90 near exit 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4281 7747 4296 7714 4298 7696 4287 7696
      4286 7698 4276 7698 4276 7731 4271 7735
      4270 7743
TIME...MOT...LOC 2004Z 248DEG 37KT 4277 7734 

HAIL...1.00IN
WIND...<50MPH
 
$$

Church

2 follow-up statements

875 
WWUS51 KBUF 182027
SVSBUF

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

NYC069-182045-
/O.CON.KBUF.SV.W.0021.000000T0000Z-170518T2045Z/
Ontario NY-
427 PM EDT THU MAY 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHEASTERN ONTARIO COUNTY...

At 426 PM EDT, a severe thunderstorm was located near Geneva, 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, Clifton Springs, Phelps, Rushville, Gorham,
Seneca Lake State Park and Seneca Castle.

This includes Interstate 90 near exit 42.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4296 7714 4298 7696 4287 7696 4286 7698
      4276 7698 4276 7731 4271 7735 4270 7741
      4282 7744
TIME...MOT...LOC 2026Z 248DEG 37KT 4286 7704 

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

Church

521 
WWUS51 KBUF 182043
SVSBUF

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

NYC069-182052-
/O.EXP.KBUF.SV.W.0021.000000T0000Z-170518T2045Z/
Ontario NY-
443 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ONTARIO COUNTY
WILL EXPIRE AT 445 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for 
southeast Livingston and Ontario counties.

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

LAT...LON 4296 7714 4298 7696 4287 7696 4286 7698
      4276 7698 4276 7731 4271 7735 4270 7741
      4282 7744
TIME...MOT...LOC 2042Z 248DEG 37KT 4292 7684 

$$

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, 3:22 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	38 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, 4:39 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.