Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 12, NWS Buffalo, NY

May 1, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 1, 2017, 4:52 PM EDT for 4 counties in New York. It was in force for 53 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 1, 2017, 4:52 PM EDT (20:52 UTC)
Expired
May 1, 2017, 5:45 PM EDT
In force
53 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Buffalo radar (KBUF), 117 km from the middle of the area, began a volume at 20:53 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

TimeReportWhereRemark
May 1, 5:10 PM EDTTSTM WND DMG4 E Groveland, NYSEVERAL TREES DOWN
May 1, 5:17 PM EDTTSTM WND DMGSpringwater, NYSEVERAL TREES DOWN
May 1, 5:22 PM EDTTSTM WND DMGCheshire, NYTREE AND LINES DOWN
May 1, 5:25 PM EDTTSTM WND DMGCanandaigua, NYPOWER POLE DOWN

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.

IssuedProductOfficeLasted
May 1, 2:12 PM EDTTornado WatchSPC8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.9 hours before the alert went out and 114 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2017-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2017-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 306 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1242 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
306 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

640 
WUUS51 KBUF 012052
SVRBUF
NYC051-055-069-117-012145-
/O.NEW.KBUF.SV.W.0012.170501T2052Z-170501T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
452 PM EDT MON MAY 1 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Wayne County in western New York...
  Eastern Livingston County in western New York...
  Southeastern Monroe County in western New York...
  Ontario County in western New York...

* Until 545 PM EDT.

* At 451 PM EDT, severe thunderstorms were located along a line
  extending from 8 miles north of Webster to 6 miles southeast of
  Letchworth State Park, moving east at 50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Irondequoit, Geneva, Canandaigua, East Rochester, Webster, 
  Fairport, Dansville, Victor, Geneseo, Ontario, Williamson, and 
  Brighton.

This includes the following highways...
 Interstate 390 near exit 5.
 Interstate 90 between exits 45 and 42.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4255 7778 4330 7748 4332 7738 4333 7717
      4331 7697 4338 7674 4302 7691 4301 7696
      4276 7697 4276 7731 4267 7737 4258 7737
      4258 7766 4255 7766
TIME...MOT...LOC 2051Z 266DEG 44KT 4333 7739 4258 7789 

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

HITCHCOCK
2 follow-up statements
716 
WWUS51 KBUF 012120
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
520 PM EDT MON MAY 1 2017

NYC051-055-069-117-012145-
/O.CON.KBUF.SV.W.0012.000000T0000Z-170501T2145Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
520 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR WAYNE...EASTERN LIVINGSTON...SOUTHEASTERN MONROE AND ONTARIO
COUNTIES...

At 519 PM EDT, severe thunderstorms were located along a line
extending from near Sodus to near Wayland, moving east at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Irondequoit, Geneva, Canandaigua, East Rochester, Webster, Fairport,
Dansville, Brighton, Williamson, Newark, Victor.

This includes the following highways...
 Interstate 390 near exit 5.
 Interstate 90 between exits 45 and 42.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4255 7778 4330 7748 4332 7738 4333 7717
      4331 7697 4338 7674 4302 7691 4301 7696
      4276 7697 4276 7731 4267 7737 4258 7737
      4258 7766 4255 7766
TIME...MOT...LOC 2119Z 273DEG 34KT 4331 7703 4262 7753 

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

HITCHCOCK
466 
WWUS51 KBUF 012152
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
552 PM EDT MON MAY 1 2017

NYC051-055-069-117-012201-
/O.EXP.KBUF.SV.W.0012.000000T0000Z-170501T2145Z/
Wayne NY-Livingston NY-Monroe NY-Ontario NY-
552 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR WAYNE...EASTERN LIVINGSTON...
SOUTHEASTERN MONROE AND ONTARIO COUNTIES HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for 
eastern Ontario, southern Wayne and central Cayuga counties.

A tornado watch remains in effect until 1000 PM EDT for western New
York.

LAT...LON 4255 7778 4330 7748 4332 7738 4333 7717
      4331 7697 4338 7674 4302 7691 4301 7696
      4276 7697 4276 7731 4267 7737 4258 7737
      4258 7766 4255 7766
TIME...MOT...LOC 2151Z 266DEG 44KT 4333 7653 4265 7703 

$$

Church

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 8:20 PM EDTSpecial Weather StatementBUFOntario40 min
Apr 30, 9:57 PM EDTSpecial Weather StatementBUFNiagara48 min
Apr 30, 10:09 PM EDTSpecial Marine WarningBUF81 min
Apr 30, 10:34 PM EDTSevere Thunderstorm WarningBUFErie, Niagara41 min
May 1, 3:45 AM EDTLakeshore Flood WarningBUFCayuga, Jefferson, Oswego, Wayne60 hr
May 1, 6:16 AM EDTFlood WatchBUFAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more13 hr
May 1, 2:10 PM EDTSpecial Marine WarningBUF95 min
May 1, 2:20 PM EDTSevere Thunderstorm WarningBUFChautauqua55 min
May 1, 2:40 PM EDTSpecial Marine WarningBUF65 min
May 1, 2:41 PM EDTSpecial Marine WarningBUF64 min
May 1, 3:00 PM EDTSevere Thunderstorm WarningBUFErie, Niagara60 min
May 1, 3:06 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua, Erie54 min
May 1, 3:26 PM EDTSpecial Marine WarningBUF94 min
May 1, 3:47 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Niagara, Orleans, Wyoming58 min
May 1, 3:50 PM EDTSevere Thunderstorm WarningBUFAllegany, Cattaraugus55 min
May 1, 4:16 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Monroe, Orleans, Wyoming14 min
May 1, 4:24 PM EDTSevere Thunderstorm WarningBUFGenesee, Livingston, Monroe, Orleans, Wyoming51 min
May 1, 4:28 PM EDTSevere Thunderstorm WarningBUFAllegany, Livingston62 min
May 1, 4:45 PM EDTAreal Flood WarningBUFAllegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 5 more3 hr
May 1, 4:49 PM EDTSpecial Marine WarningBUF116 min
May 1, 5:18 PM EDTSmall Craft AdvisoryBUF47 hr
May 1, 5:36 PM EDTSevere Thunderstorm WarningBUFJefferson, Oswego54 min
May 1, 5:38 PM EDTSpecial Marine WarningBUF97 min
May 1, 5:46 PM EDTSevere Thunderstorm WarningBUFCayuga, Ontario, Wayne59 min
May 1, 6:09 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis, Oswego66 min
May 1, 6:45 PM EDTSpecial Marine WarningBUF60 min

Nearby

Severe Thunderstorm Warnings in New York, 2017Every 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.