Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 11, NWS Buffalo, NY

May 1, 2017Allegany County, Livingston County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 1, 2017, 4:28 PM EDT for Allegany County, Livingston County, New York. It was in force for 62 min. 7 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, 4:28 PM EDT (20:28 UTC)
Expired
May 1, 2017, 5:30 PM EDT
In force
62 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
70.0 mph

Counties Allegany County, NY, Livingston County, NY

The radar

The Buffalo radar (KBUF), 96 km from the middle of the area, began a volume at 20:33 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, 4:40 PM EDTTSTM WND DMG5 Sw Bolivar, NYNUMEROUS TREES AND LINES DOWN
May 1, 4:52 PM EDTTSTM WND DMG4 Wsw Wellsville, NYSEVERAL TREES SNAPPED OR UPROOTED.
May 1, 4:54 PM EDTTSTM WND DMGWellsville, NYLARGE TREE DOWN... LITTLE LEAGUE FIELD FENCE DAMAGED.
May 1, 4:55 PM EDTTSTM WND DMGWellsville, NYNUMEROUS TREES AND LINES DOWN
May 1, 4:55 PM EDTTSTM WND GST 606 Nw Grove, NYMESONET
May 1, 4:55 PM EDTTSTM WND GST 606 S Nunda, NY
May 1, 4:55 PM EDTNON-TSTM WND GST 606 Nw Grove, NYMESONET

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, 8.5 hours before the alert went out and 93 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.

510 
WUUS51 KBUF 012028
SVRBUF
NYC003-051-012130-
/O.NEW.KBUF.SV.W.0011.170501T2028Z-170501T2130Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Livingston County in western New York...
  Allegany County in western New York...

* Until 530 PM EDT.

* At 428 PM EDT, severe thunderstorms were located along a line
  extending from near Weston Mills to near Betula, moving northeast
  at 65 mph.

  HAZARD...70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Wellsville, Alfred, Belfast, Whitesville, Friendship, Scio, Bolivar
  and Andover.

This includes the following highways...
 Interstate 390 near exit 5.
 Interstate 86 between exits 29 and 33.

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 4200 7830 4252 7807 4259 7772 4253 7771
      4253 7772 4200 7775
TIME...MOT...LOC 2028Z 230DEG 58KT 4215 7835 4163 7841 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HITCHCOCK
2 follow-up statements
024 
WWUS51 KBUF 012103
SVSBUF

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

NYC003-051-012130-
/O.CON.KBUF.SV.W.0011.000000T0000Z-170501T2130Z/
Livingston NY-Allegany NY-
503 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTH CENTRAL LIVINGSTON AND EASTERN ALLEGANY COUNTIES...

At 502 PM EDT, severe thunderstorms were located along a line
extending from 6 miles southwest of Dansville to near Genesee, moving
northeast at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Wellsville, Alfred, Whitesville, Scio, Andover, Belmont, Angelica and
Alma.

This includes the following highways...
 Interstate 390 near exit 5.
 Interstate 86 between exits 31 and 33.

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 4200 7815 4254 7796 4259 7772 4253 7771
      4253 7772 4200 7775
TIME...MOT...LOC 2102Z 240DEG 55KT 4250 7778 4201 7784 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HITCHCOCK
621 
WWUS51 KBUF 012121
SVSBUF

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

NYC003-051-012130-
/O.EXP.KBUF.SV.W.0011.000000T0000Z-170501T2130Z/
Livingston NY-Allegany NY-
521 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL LIVINGSTON AND
EASTERN ALLEGANY COUNTIES WILL EXPIRE AT 530 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.

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

LAT...LON 4200 7815 4254 7796 4259 7772 4253 7771
      4253 7772 4200 7775
TIME...MOT...LOC 2120Z 230DEG 58KT 4267 7750 4219 7756 

$$

JJR

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, 4:45 PM EDTAreal Flood WarningBUFAllegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 5 more3 hr
May 1, 4:49 PM EDTSpecial Marine WarningBUF116 min
May 1, 4:52 PM EDTSevere Thunderstorm WarningBUFLivingston, Monroe, Ontario, Wayne53 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.