Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 4, NWS Buffalo, NY

May 1, 2017Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at May 1, 2017, 2:20 PM EDT for Chautauqua County, New York. It was in force for 55 min. 5 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, 2:20 PM EDT (18:20 UTC)
Expired: May 1, 2017, 3:15 PM EDT
In force: 55 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 92 km from the middle of the area, began a volume at 18:21 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

Time	Report	Where	Remark
May 1, 3:00 PM EDT	MARINE TSTM WIND 51	Dunkirk, NY
May 1, 3:03 PM EDT	TSTM WND DMG	4 Sw Chautauqua, NY	TREE DOWN ON STEDMAN-SHERMAN RD.
May 1, 3:06 PM EDT	TSTM WND DMG	1 Nw Bemus Point, NY	TREE DOWN ON LAKESIDE DRIVE.
May 1, 3:13 PM EDT	TSTM WND DMG	Ellery Center, NY	TREES AND WIRES DOWN.
May 1, 3:18 PM EDT	TSTM WND GST 78	3 Ssw Sinclairville, NY

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.

Issued	Product	Office	Lasted
May 1, 2:12 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.3 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-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: 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.

254 
WUUS51 KBUF 011820
SVRBUF
NYC013-011915-
/O.NEW.KBUF.SV.W.0004.170501T1820Z-170501T1915Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Chautauqua County in western New York...

* Until 315 PM EDT.

* At 219 PM EDT, severe thunderstorms were located along a line
  extending from near Girard to near Meadville to 8 miles southeast
  of Atlantic, moving northeast at 60 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...
  Jamestown, Dunkirk, Fredonia, Westfield, Lakewood, Mayville, Clymer
  and Long Point State Park.

This includes the following highways...
 Interstate 90 between exits 61 and 59.
 Interstate 86 between exits 4 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

These are potentially deadly storms. Seek shelter in an interior room
on the lowest floor of a well-built structure. Abandon vehicles in
search of a more substantial permanent structure. Stay away from
windows.

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

&&


LAT...LON 4244 7950 4253 7939 4254 7934 4258 7926
      4233 7921 4200 7925 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 1819Z 226DEG 53KT 4202 8028 4170 8016 4142 8023 

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

HITCHCOCK

2 follow-up statements

655 
WWUS51 KBUF 011844
SVSBUF

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

NYC013-011915-
/O.CON.KBUF.SV.W.0004.000000T0000Z-170501T1915Z/
Chautauqua NY-
244 PM EDT MON MAY 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR CHAUTAUQUA COUNTY...

At 243 PM EDT, severe thunderstorms were located along a line
extending from near Northwest Harborcreek to Union City to near Guys
Mills, moving northeast at 60 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...
Jamestown, Dunkirk, Fredonia, Westfield, Lakewood, Mayville, Clymer
and Long Point State Park.

This includes the following highways...
 Interstate 90 between exits 61 and 59.
 Interstate 86 between exits 4 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

These are potentially deadly storms. Seek shelter in an interior 
room on the lowest floor of a well-built structure. Abandon vehicles 
in search of a more substantial permanent structure. Stay away from 
windows.

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 4244 7950 4253 7939 4254 7934 4258 7926
      4233 7921 4200 7925 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 1843Z 226DEG 53KT 4224 7998 4192 7986 4164 7993 

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

Church

251 
WWUS51 KBUF 011917
SVSBUF

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

NYC013-011926-
/O.EXP.KBUF.SV.W.0004.000000T0000Z-170501T1915Z/
Chautauqua NY-
317 PM EDT MON MAY 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR CHAUTAUQUA COUNTY HAS
EXPIRED...
    
The storms which prompted the warning have moved out of western 
Chautauqua county.

Remember, a Severe Thunderstorm Warning still remains in effect for 
central and eastern Chautauqua County, southern Erie county and 
Cattaraugus County.

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


LAT...LON 4244 7950 4253 7939 4254 7934 4258 7926
      4233 7921 4200 7925 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 1916Z 226DEG 53KT 4255 7955 4223 7943 4195 7950 

$$

Church

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 8:20 PM EDT	Special Weather Statement	BUF	Ontario	40 min
Apr 30, 9:57 PM EDT	Special Weather Statement	BUF	Niagara	48 min
Apr 30, 10:09 PM EDT	Special Marine Warning	BUF		81 min
Apr 30, 10:34 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	41 min
May 1, 3:45 AM EDT	Lakeshore Flood Warning	BUF	Cayuga, Jefferson, Oswego, Wayne	60 hr
May 1, 6:16 AM EDT	Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	13 hr
May 1, 2:10 PM EDT	Special Marine Warning	BUF		95 min
May 1, 2:40 PM EDT	Special Marine Warning	BUF		65 min
May 1, 2:41 PM EDT	Special Marine Warning	BUF		64 min
May 1, 3:00 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	60 min
May 1, 3:06 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	54 min
May 1, 3:26 PM EDT	Special Marine Warning	BUF		94 min
May 1, 3:47 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans, Wyoming	58 min
May 1, 3:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	55 min
May 1, 4:16 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Orleans, Wyoming	14 min
May 1, 4:24 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Orleans, Wyoming	51 min
May 1, 4:28 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	62 min
May 1, 4:45 PM EDT	Areal Flood Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston and 5 more	3 hr
May 1, 4:49 PM EDT	Special Marine Warning	BUF		116 min
May 1, 4:52 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario, Wayne	53 min
May 1, 5:18 PM EDT	Small Craft Advisory	BUF		47 hr
May 1, 5:36 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	54 min
May 1, 5:38 PM EDT	Special Marine Warning	BUF		97 min
May 1, 5:46 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	59 min
May 1, 6:09 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	66 min
May 1, 6:45 PM EDT	Special Marine Warning	BUF		60 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.