Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 30, NWS Buffalo, NY

May 19, 2017Livingston County, Ontario County, Wyoming County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 19, 2017, 12:02 AM EDT for Livingston County, Ontario County, Wyoming County, New York. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 19, 2017, 12:02 AM EDT (04:02 UTC)
Expired: May 19, 2017, 12:30 AM EDT
In force: 28 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 89 km from the middle of the area, began a volume at 04:02 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 4.0 hours before the alert went out and 86 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: 13 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 2030 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

951 
WUUS51 KBUF 190402
SVRBUF
NYC051-069-121-190445-
/O.NEW.KBUF.SV.W.0030.170519T0402Z-170519T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1202 AM EDT FRI MAY 19 2017

The National Weather Service in Buffalo has issued a

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

* Until 1245 AM EDT.

* At 1202 AM EDT, a severe thunderstorm was located near
  Portageville, or near Letchworth State Park, moving east at 50 mph.

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

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Dansville, Letchworth State Park, Perry, Mount Morris, Naples,
  Portageville, Groveland and Springwater.

This includes Interstate 390 between exits 4 and 6.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4251 7784 4252 7784 4252 7796 4254 7820
      4272 7819 4270 7735 4258 7737 4258 7766
      4254 7766 4253 7772 4250 7772
TIME...MOT...LOC 0402Z 274DEG 45KT 4263 7810 

HAIL...0.75IN
WIND...60MPH
 
$$

Wood

2 follow-up statements

703 
WWUS51 KBUF 190420
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1220 AM EDT FRI MAY 19 2017

NYC121-190430-
/O.CAN.KBUF.SV.W.0030.000000T0000Z-170519T0445Z/
Wyoming NY-
1220 AM EDT FRI MAY 19 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.

LAT...LON 4251 7784 4252 7784 4252 7796 4271 7795
      4270 7735 4268 7735 4267 7737 4258 7737
      4258 7766 4254 7766 4253 7772 4250 7772
TIME...MOT...LOC 0420Z 274DEG 45KT 4261 7779 

$$

NYC051-069-190445-
/O.CON.KBUF.SV.W.0030.000000T0000Z-170519T0445Z/
Livingston NY-Ontario NY-
1220 AM EDT FRI MAY 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT
FOR SOUTHERN LIVINGSTON AND SOUTHWESTERN ONTARIO COUNTIES...

At 1220 AM EDT, a severe thunderstorm was located near Dansville,
moving east at 50 mph.

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

SOURCE...Radar indicated. 

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

Locations impacted include...
Dansville, Letchworth State Park, Naples, Groveland, Springwater,
Nunda, Ossian and Sonyea.

This includes Interstate 390 between exits 4 and 6.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4251 7784 4252 7784 4252 7796 4271 7795
      4270 7735 4268 7735 4267 7737 4258 7737
      4258 7766 4254 7766 4253 7772 4250 7772
TIME...MOT...LOC 0420Z 274DEG 45KT 4261 7779 

HAIL...0.75IN
WIND...60MPH
 
$$

Wood

196 
WWUS51 KBUF 190430
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1230 AM EDT FRI MAY 19 2017

NYC051-069-190440-
/O.CAN.KBUF.SV.W.0030.000000T0000Z-170519T0445Z/
Livingston NY-Ontario NY-
1230 AM EDT FRI MAY 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LIVINGSTON AND
SOUTHWESTERN ONTARIO COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 4251 7784 4252 7784 4252 7796 4271 7795
      4270 7735 4268 7735 4267 7737 4258 7737
      4258 7766 4254 7766 4253 7772 4250 7772
TIME...MOT...LOC 0429Z 274DEG 45KT 4260 7762 

$$

Wood

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 8:50 PM EDT	Special Weather Statement	BUF	Chautauqua	25 min
May 18, 9:01 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	15 min
May 18, 9:08 PM EDT	Special Marine Warning	BUF		37 min
May 18, 11:14 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Monroe, Ontario, Oswego, Wayne	46 min
May 18, 11:27 PM EDT	Special Weather Statement	BUF	Ontario	33 min
May 18, 11:33 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	57 min
May 18, 11:34 PM EDT	Special Marine Warning	BUF		56 min
May 18, 11:49 PM EDT	Special Weather Statement	BUF	Wyoming	26 min
May 19, 12:32 AM EDT	Special Weather Statement	BUF	Wyoming	43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.