Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 69, NWS Buffalo, NY

September 21, 2018Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 21, 2018, 6:51 PM EDT for Allegany County, New York. It was in force for 54 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: Sep 21, 2018, 6:51 PM EDT (22:51 UTC)
Expired: Sep 21, 2018, 7:45 PM EDT
In force: 54 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 93 km from the middle of the area, began a volume at 22:56 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
Sep 21, 7:12 PM EDT	TSTM WND DMG	Bolivar, NY	TREE DOWN
Sep 21, 7:14 PM EDT	TSTM WND DMG	Belmont, NY	TREE 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.

Issued	Product	Office	Lasted
Sep 21, 4:50 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.9 hours before the alert went out and 89 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: 445 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

349 
WUUS51 KBUF 212251
SVRBUF
NYC003-212345-
/O.NEW.KBUF.SV.W.0069.180921T2251Z-180921T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
651 PM EDT FRI SEP 21 2018

The National Weather Service in Buffalo has issued a

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

* Until 745 PM EDT..

* At 650 PM EDT, severe thunderstorms were located along a line
  extending from near Houghton to near St. Bonaventure, moving east
  at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wellsville, Alfred, Belfast, Cuba, Rushford, Houghton, Whitesville,
  Caneadea, Friendship and Scio.

This includes Interstate 86 between exits 28 and 33.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7831 4237 7831 4252 7819 4252 7784
      4247 7784 4247 7772 4200 7775
TIME...MOT...LOC 2250Z 261DEG 35KT 4249 7813 4204 7847 

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

Thomas

2 follow-up statements

455 
WWUS51 KBUF 212314
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
714 PM EDT FRI SEP 21 2018

NYC003-212345-
/O.CON.KBUF.SV.W.0069.000000T0000Z-180921T2345Z/
Allegany NY-
714 PM EDT FRI SEP 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR ALLEGANY COUNTY...

At 714 PM EDT, severe thunderstorms were located along a line
extending from near Dansville to 7 miles northeast of Shinglehouse,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7831 4233 7820 4252 7798 4252 7784
      4247 7784 4247 7772 4200 7775
TIME...MOT...LOC 2314Z 264DEG 38KT 4251 7778 4206 7813 

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

Thomas

743 
WWUS51 KBUF 212345
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
745 PM EDT FRI SEP 21 2018

NYC003-212354-
/O.EXP.KBUF.SV.W.0069.000000T0000Z-180921T2345Z/
Allegany NY-
745 PM EDT FRI SEP 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR ALLEGANY COUNTY WILL EXPIRE AT
745 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However heavy rain 
will continue with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western New York.

LAT...LON 4200 7831 4233 7820 4252 7798 4252 7784
      4247 7784 4247 7772 4200 7775
TIME...MOT...LOC 2344Z 261DEG 35KT 4255 7740 4210 7775 

$$

Thomas

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 10:00 PM EDT	Beach Hazards Statement	BUF	Chautauqua, Erie, Jefferson, Niagara, Orleans	22 hr
Sep 21, 4:45 PM EDT	Special Marine Warning	BUF		60 min
Sep 21, 5:15 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	45 min
Sep 21, 5:22 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	38 min
Sep 21, 5:27 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	48 min
Sep 21, 5:54 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Wyoming	66 min
Sep 21, 6:31 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wayne, Wyoming	59 min
Sep 21, 6:38 PM EDT	Special Marine Warning	BUF		70 min
Sep 21, 6:48 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	42 min
Sep 21, 7:07 PM EDT	Tornado Warning	BUF	Ontario	23 min
Sep 21, 7:29 PM EDT	Special Marine Warning	BUF		46 min

Nearby

Severe Thunderstorm Warnings in New York, 2018 Every severe thunderstorm warning in 2018

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.