Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 127, NWS Buffalo, NY

September 4, 2017Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 4, 2017, 11:33 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 57 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
Sep 4, 2017, 11:33 PM EDT (03:33 UTC)
Expired
Sep 5, 2017, 12:30 AM EDT
In force
57 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 81 km from the middle of the area, began a volume at 03:32 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
Sep 4, 11:45 PM EDTTSTM WND DMGHumphrey, NYTREE LIMBS DOWN
Sep 5, 12:09 AM EDTTSTM WND DMGOlean, NYTREES DOWN
Sep 5, 12:13 AM EDTTSTM WND DMGWeston Mills, NYTREES DOWN
Sep 5, 12:20 AM EDTTSTM WND DMGFriendship, NYTREES/WIRES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 3.6 hours before the alert went out and 78 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 00:00Z on 2017-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2017-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 339 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
94 J/kg
Mixed-layer CIN
-227 J/kg
Mixed-layer LCL
1561 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
339 m²/s²
0-3 km storm-relative helicity
515 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

602 
WUUS51 KBUF 050333
SVRBUF
NYC003-009-050430-
/O.NEW.KBUF.SV.W.0127.170905T0333Z-170905T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
1133 PM EDT MON SEP 4 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 1230 AM EDT.

* At 1132 PM EDT, a severe thunderstorm was located 11 miles
  northwest of Allegany State Park, moving east at 60 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

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

This includes Interstate 86 between exits 17 and 31.
 
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 4200 7892 4232 7898 4252 7828 4252 7824
      4235 7799 4200 7803
TIME...MOT...LOC 0332Z 252DEG 52KT 4214 7896 

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

HITCHCOCK
2 follow-up statements
721 
WWUS51 KBUF 050402
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1202 AM EDT TUE SEP 5 2017

NYC003-009-050430-
/O.CON.KBUF.SV.W.0127.000000T0000Z-170905T0430Z/
Cattaraugus NY-Allegany NY-
1202 AM EDT TUE SEP 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR SOUTHERN CATTARAUGUS AND WESTERN ALLEGANY COUNTIES...

At 1201 AM EDT, severe thunderstorms were located along a line
extending from near Rushford to near Allegany State Park, moving east
at 55 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Olean, Salamanca, Allegany State Park, Allegany, Franklinville,
Belfast, Cuba and Rushford.

This includes Interstate 86 between exits 17 and 31.
 
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 these storms.
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 4200 7892 4218 7894 4247 7817 4235 7799
      4200 7803
TIME...MOT...LOC 0401Z 259DEG 49KT 4236 7825 4202 7871 

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

HITCHCOCK
866 
WWUS51 KBUF 050431
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
1231 AM EDT TUE SEP 5 2017

NYC003-009-050440-
/O.EXP.KBUF.SV.W.0127.000000T0000Z-170905T0430Z/
Cattaraugus NY-Allegany NY-
1231 AM EDT TUE SEP 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN 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.

A new severe thunderstorm warning is in effect until 1 AM EDT for 
Allegany County.

LAT...LON 4200 7892 4218 7894 4247 7817 4235 7799
      4200 7803
TIME...MOT...LOC 0430Z 270DEG 52KT 4248 7774 4214 7820 

$$

HITCHCOCK

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 9:47 PM EDTSpecial Marine WarningBUF88 min
Sep 4, 10:12 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua, Erie63 min
Sep 4, 10:20 PM EDTSpecial Weather StatementBUFErie, Genesee, Wyoming40 min
Sep 4, 10:24 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Orleans, Wyoming32 min
Sep 4, 10:55 PM EDTBeach Hazards StatementBUFCayuga, Jefferson, Oswego12 hr
Sep 4, 10:59 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua61 min
Sep 4, 11:06 PM EDTSevere Thunderstorm WarningBUFMonroe, Wayne39 min
Sep 4, 11:08 PM EDTSpecial Marine WarningBUF52 min
Sep 4, 11:24 PM EDTSpecial Marine WarningBUF66 min
Sep 4, 11:51 PM EDTSpecial Marine WarningBUF39 min
Sep 4, 11:57 PM EDTSevere Thunderstorm WarningBUFCayuga, Oswego, Wayne63 min
Sep 5, 12:07 AM EDTFlash Flood WarningBUFCattaraugus, Chautauqua3 hr
Sep 5, 12:18 AM EDTSevere Thunderstorm WarningBUFAllegany, Livingston30 min
Sep 5, 12:24 AM EDTSevere Thunderstorm WarningBUFOntario, Wayne21 min
Sep 5, 10:19 AM EDTSpecial Marine WarningBUF41 min
Sep 5, 10:23 AM EDTSpecial Weather StatementBUFAllegany37 min
Sep 5, 10:38 AM EDTSpecial Weather StatementBUFAllegany37 min
Sep 5, 5:46 PM EDTSpecial Marine WarningBUF59 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.