Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 8, NWS Buffalo, NY

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

NWS Buffalo, NY issued this severe thunderstorm warning at May 1, 2017, 3:50 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 55 min. 2 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, 3:50 PM EDT (19:50 UTC)
Expired
May 1, 2017, 4:45 PM EDT
In force
55 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 75 km from the middle of the area, began a volume at 19:54 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, 4:24 PM EDTTSTM WND DMGOlean, NYTREE DOWN.
May 1, 4:34 PM EDTTSTM WND DMGCuba, NYNUMEROUS TREES AND LINES 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, 7.8 hours before the alert went out and 72 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.

722 
WUUS51 KBUF 011950
SVRBUF
NYC003-009-012045-
/O.NEW.KBUF.SV.W.0008.170501T1950Z-170501T2045Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Cattaraugus County in western New York...
  Western Allegany County in western New York...

* Until 445 PM EDT.

* At 350 PM EDT, severe thunderstorms were located along a line
  extending from near Springville to near Ludlow, moving northeast at
  75 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...
  Olean, Salamanca, Allegany State Park, Ashford, Arcade, Allegany,
  Franklinville and Cuba.

This includes Interstate 86 between exits 19 and 28.
 
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 7888 4250 7864 4253 7849 4252 7846
      4252 7805 4200 7828
TIME...MOT...LOC 1950Z 226DEG 67KT 4253 7872 4177 7893 

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

HITCHCOCK
3 follow-up statements
787 
WWUS51 KBUF 012023
SVSBUF

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

NYC003-009-012045-
/O.CON.KBUF.SV.W.0008.000000T0000Z-170501T2045Z/
Cattaraugus NY-Allegany NY-
423 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CATTARAUGUS AND WESTERN ALLEGANY COUNTIES...

At 423 PM EDT, severe thunderstorms were located along a line
extending from near Attica to St. Bonaventure, moving northeast at 60
mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Olean, Salamanca, Allegany State Park, Ashford, Arcade, Allegany,
Franklinville and Cuba.

This includes Interstate 86 between exits 19 and 28.
 
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 7888 4250 7864 4253 7849 4252 7846
      4252 7805 4200 7828
TIME...MOT...LOC 2023Z 232DEG 54KT 4282 7826 4206 7848 

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

Church
842 
WWUS51 KBUF 012033
SVSBUF

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

NYC003-009-012045-
/O.CON.KBUF.SV.W.0008.000000T0000Z-170501T2045Z/
Cattaraugus NY-Allegany NY-
433 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR EASTERN CATTARAUGUS AND WESTERN ALLEGANY COUNTIES...

At 433 PM EDT, severe thunderstorms were located along a line
extending from near Warsaw to near Olean, moving northeast at 55 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Olean, Arcade, Allegany, Franklinville, Cuba, Rushford, St.
Bonaventure and Houghton.

This includes Interstate 86 between exits 24 and 28.
 
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 7866 4252 7846 4252 7805 4200 7828
TIME...MOT...LOC 2033Z 236DEG 46KT 4277 7820 4201 7842 

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

Church
937 
WWUS51 KBUF 012047
SVSBUF

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

NYC003-009-012056-
/O.EXP.KBUF.SV.W.0008.000000T0000Z-170501T2045Z/
Cattaraugus NY-Allegany NY-
447 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CATTARAUGUS AND
WESTERN ALLEGANY 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 warning remains in effect for central and eastern 
Allegany county.

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

LAT...LON 4200 7866 4252 7846 4252 7805 4200 7828
TIME...MOT...LOC 2046Z 226DEG 67KT 4292 7798 4217 7820 

$$

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, 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, 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.