Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 28, NWS Buffalo, NY

May 18, 20175 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 18, 2017, 11:14 PM EDT for 5 counties in New York. It was in force for 46 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 18, 2017, 11:14 PM EDT (03:14 UTC)
Expired: May 19, 2017, 12:00 AM EDT
In force: 46 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cayuga County, NY, Monroe County, NY, Ontario County, NY, Oswego County, NY, Wayne County, NY

The radar

The Ft Drum radar (KTYX), 95 km from the middle of the area, began a volume at 03:13 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, 3.2 hours before the alert went out and 179 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.

175 
WUUS51 KBUF 190314
SVRBUF
NYC011-055-069-075-117-190400-
/O.NEW.KBUF.SV.W.0028.170519T0314Z-170519T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1114 PM EDT THU MAY 18 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Wayne County in western New York...
  Cayuga County in central New York...
  Southwestern Oswego County in central New York...
  Southeastern Monroe County in western New York...
  Northern Ontario County in western New York...

* Until 1200 AM EDT.

* At 1114 PM EDT, a severe thunderstorm was located near Marion, or
  15 miles east of Webster, moving east at 60 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...
  Rochester, Fulton, East Rochester, Fairport, Brighton, Henrietta,
  Penfield and Newark.

This includes the following highways...
 Interstate 90 between exits 45 and 40.
 Interstate 81 near exit 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4323 7610 4327 7620 4322 7619 4320 7621
      4324 7626 4320 7627 4323 7631 4323 7648
      4314 7649 4311 7647 4310 7650 4303 7650
      4301 7696 4295 7697 4288 7755 4311 7766
      4340 7615
TIME...MOT...LOC 0314Z 259DEG 54KT 4315 7713 

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

Wood

2 follow-up statements

545 
WWUS51 KBUF 190339
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1139 PM EDT THU MAY 18 2017

NYC011-055-069-075-117-190400-
/O.CON.KBUF.SV.W.0028.000000T0000Z-170519T0400Z/
Wayne NY-Cayuga NY-Oswego NY-Monroe NY-Ontario NY-
1139 PM EDT THU MAY 18 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT
FOR SOUTHERN WAYNE...CAYUGA...SOUTHWESTERN OSWEGO...SOUTHEASTERN
MONROE AND NORTHERN ONTARIO COUNTIES...

At 1138 PM EDT, a severe thunderstorm was located over Lyons, or 11
miles north of Geneva, 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...
Fairport, Newark, Lyons, Palmyra, Victor, Clifton Springs, Clyde and
Phelps.

This includes the following highways...
 Interstate 90 between exits 45 and 40.
 Interstate 81 near exit 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4323 7610 4327 7620 4322 7619 4320 7621
      4324 7626 4320 7627 4323 7631 4323 7648
      4314 7649 4311 7647 4310 7650 4303 7650
      4301 7696 4295 7697 4288 7755 4309 7746
      4334 7613
TIME...MOT...LOC 0338Z 258DEG 43KT 4303 7702 

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

Wood

604 
WWUS51 KBUF 190359
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1159 PM EDT THU MAY 18 2017

NYC011-055-069-075-117-190408-
/O.EXP.KBUF.SV.W.0028.000000T0000Z-170519T0400Z/
Wayne NY-Cayuga NY-Oswego NY-Monroe NY-Ontario NY-
1159 PM EDT THU MAY 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WAYNE...CAYUGA...
SOUTHWESTERN OSWEGO...SOUTHEASTERN MONROE AND NORTHERN ONTARIO
COUNTIES WILL EXPIRE AT MIDNIGHT 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.  However small hail
and gusty winds are still possible with this thunderstorm.

LAT...LON 4323 7610 4327 7620 4322 7619 4320 7621
      4324 7626 4320 7627 4323 7631 4323 7648
      4314 7649 4311 7647 4310 7650 4303 7650
      4301 7696 4295 7697 4288 7755 4309 7746
      4334 7613
TIME...MOT...LOC 0358Z 259DEG 54KT 4261 7833 

$$

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, 11:27 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, 12:02 AM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wyoming	28 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.