Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 80, NWS Buffalo, NY

July 23, 2017Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 23, 2017, 2:34 PM EDT for Allegany County, New York. It was in force for 56 min. 3 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: Jul 23, 2017, 2:34 PM EDT (18:34 UTC)
Expired: Jul 23, 2017, 3:30 PM EDT
In force: 56 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), 108 km from the middle of the area, began a volume at 18:35 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
Jul 23, 2:45 PM EDT	TSTM WND DMG	Belmont, NY	TREES DOWN IN BELMONT
Jul 23, 2:45 PM EDT	TSTM WND DMG	Scio, NY	TREES DOWN IN SCIO
Jul 23, 3:16 PM EDT	TSTM WND DMG	Andover, NY	TREES DOWN IN ANDOVER

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 12:00Z, 6.6 hours before the alert went out and 105 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: 1092 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

538 
WUUS51 KBUF 231834
SVRBUF
NYC003-231930-
/O.NEW.KBUF.SV.W.0080.170723T1834Z-170723T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
234 PM EDT SUN JUL 23 2017

The National Weather Service in Buffalo has issued a

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

* Until 330 PM EDT.

* At 234 PM EDT, a severe thunderstorm was located near Cuba, or 11
  miles northwest of Wellsville, moving east at 20 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Wellsville, Whitesville, Friendship, Scio, Andover, Belmont,
  Richburg and West Clarksville.

This includes Interstate 86 between exits 29 and 30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4212 7830 4230 7820 4223 7774 4200 7775
      4200 7784
TIME...MOT...LOC 1834Z 287DEG 18KT 4220 7815 

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

Wood

2 follow-up statements

746 
WWUS51 KBUF 231902
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
302 PM EDT SUN JUL 23 2017

NYC003-231930-
/O.CON.KBUF.SV.W.0080.000000T0000Z-170723T1930Z/
Allegany NY-
302 PM EDT SUN JUL 23 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR SOUTHERN ALLEGANY COUNTY...

At 302 PM EDT, a severe thunderstorm was located near Wellsville,
moving east at 25 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Wellsville, Whitesville, Scio, Andover, Belmont, Richburg, Stannards
and Paynesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4210 7823 4227 7799 4223 7774 4200 7775
      4200 7784
TIME...MOT...LOC 1902Z 279DEG 22KT 4218 7792 

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

Wood

238 
WWUS51 KBUF 231929
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
329 PM EDT SUN JUL 23 2017

NYC003-231939-
/O.EXP.KBUF.SV.W.0080.000000T0000Z-170723T1930Z/
Allegany NY-
329 PM EDT SUN JUL 23 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ALLEGANY COUNTY WILL
EXPIRE AT 330 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

LAT...LON 4210 7823 4227 7799 4223 7774 4200 7775
      4200 7784
TIME...MOT...LOC 1929Z 287DEG 18KT 4214 7775 

$$

Smith

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 4:31 AM EDT	Beach Hazards Statement	BUF	Monroe, Niagara, Orleans	18 hr
Jul 23, 4:31 AM EDT	Lakeshore Flood Watch	BUF	Monroe, Niagara, Orleans	5 hr
Jul 23, 4:32 AM EDT	Small Craft Advisory	BUF		24 hr
Jul 23, 9:57 AM EDT	Lakeshore Flood Warning	BUF	Monroe, Orleans	19 hr
Jul 23, 1:34 PM EDT	Special Weather Statement	BUF	Allegany	56 min
Jul 23, 2:12 PM EDT	Special Weather Statement	BUF	Ontario	63 min
Jul 23, 2:22 PM EDT	Special Weather Statement	BUF	Allegany	53 min
Jul 23, 2:59 PM EDT	Tornado Warning	BUF	Ontario	31 min
Jul 23, 3:28 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	62 min
Jul 23, 3:30 PM EDT	Special Weather Statement	BUF	Genesee	60 min
Jul 23, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Wyoming	41 min
Jul 23, 3:57 PM EDT	Flash Flood Warning	BUF	Ontario	3 hr
Jul 23, 4:15 PM EDT	Flash Flood Warning	BUF	Genesee, Wyoming	3 hr
Jul 23, 4:38 PM EDT	Special Weather Statement	BUF	Livingston	67 min
Jul 23, 4:59 PM EDT	Flash Flood Warning	BUF	Livingston, Ontario	4 hr
Jul 23, 5:32 PM EDT	Special Weather Statement	BUF	Niagara	88 min
Jul 23, 6:13 PM EDT	Special Marine Warning	BUF		62 min
Jul 23, 6:53 PM EDT	Areal Flood Warning	BUF	Ontario	12 hr

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.