Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 20, NWS Buffalo, NY

May 18, 2017Livingston County, Ontario County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2017, 3:57 PM EDT for Livingston County, Ontario County, Wyoming County, New York. It was in force for 48 min. 1 report 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, 3:57 PM EDT (19:57 UTC)
Expired: May 18, 2017, 4:45 PM EDT
In force: 48 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Livingston County, NY, Ontario County, NY, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 77 km from the middle of the area, began a volume at 19:58 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, 4:30 PM EDT	TSTM WND DMG	Groveland, NY	TREES AND WIRES DOWN. TIME ESTIMATED FROM RADAR.

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, 8.0 hours before the alert went out and 73 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.

990 
WUUS51 KBUF 181957
SVRBUF
NYC051-069-121-182045-
/O.NEW.KBUF.SV.W.0020.170518T1957Z-170518T2045Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southern Wyoming County in western New York...
  Livingston County in western New York...
  Southwestern Ontario County in western New York...

* Until 445 PM EDT.

* At 357 PM EDT, a severe thunderstorm was located 9 miles northeast
  of Arcade, or 16 miles west of Letchworth State Park, moving east
  at 50 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. 

* Locations impacted include...
  Geneseo, Dansville, Letchworth State Park, Perry, Warsaw, Mount
  Morris, Conesus and Naples.

This includes Interstate 390 between exits 4 and 7.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4268 7840 4288 7745 4258 7738 4258 7766
      4254 7766 4252 7835
TIME...MOT...LOC 1957Z 257DEG 46KT 4261 7829 

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

Church

3 follow-up statements

311 
WWUS51 KBUF 182015
SVSBUF

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

NYC051-069-121-182045-
/O.CON.KBUF.SV.W.0020.000000T0000Z-170518T2045Z/
Wyoming NY-Livingston NY-Ontario NY-
415 PM EDT THU MAY 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN WYOMING...LIVINGSTON AND SOUTHWESTERN ONTARIO
COUNTIES...

At 415 PM EDT, a severe thunderstorm was located over Letchworth
State Park, moving east at 50 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...
Geneseo, Dansville, Letchworth State Park, Perry, Mount Morris,
Conesus, Naples and Portageville.

This includes Interstate 390 between exits 4 and 7.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4274 7808 4288 7745 4258 7738 4258 7766
      4254 7766 4253 7806
TIME...MOT...LOC 2015Z 257DEG 46KT 4266 7798 

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

Church

806 
WWUS51 KBUF 182031
SVSBUF

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

NYC121-182040-
/O.CAN.KBUF.SV.W.0020.000000T0000Z-170518T2045Z/
Wyoming NY-
431 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WYOMING COUNTY 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 4278 7788 4288 7745 4258 7738 4258 7783
TIME...MOT...LOC 2030Z 257DEG 46KT 4271 7771 

$$

NYC051-069-182045-
/O.CON.KBUF.SV.W.0020.000000T0000Z-170518T2045Z/
Livingston NY-Ontario NY-
431 PM EDT THU MAY 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL LIVINGSTON AND SOUTHWESTERN ONTARIO COUNTIES...

At 430 PM EDT, a severe thunderstorm was located over Conesus, or 8
miles southeast of Geneseo, moving east at 55 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Geneseo, Mount Morris, Conesus, Naples, Honeoye, Hemlock, Groveland
and Springwater.

This includes Interstate 390 between exits 6 and 7.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4278 7788 4288 7745 4258 7738 4258 7783
TIME...MOT...LOC 2030Z 257DEG 46KT 4271 7771 

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

Church

751 
WWUS51 KBUF 182042
SVSBUF

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

NYC051-069-182051-
/O.EXP.KBUF.SV.W.0020.000000T0000Z-170518T2045Z/
Livingston NY-Ontario NY-
442 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LIVINGSTON AND
SOUTHWESTERN ONTARIO COUNTIES 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 4278 7788 4288 7745 4258 7738 4258 7783
TIME...MOT...LOC 2041Z 257DEG 46KT 4274 7753 

$$

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, 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.