Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 96, NWS Buffalo, NY

August 4, 2017Erie County, Genesee County, Niagara County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2017, 5:00 PM EDT for Erie County, Genesee County, Niagara County, New York. It was in force for 45 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: Aug 4, 2017, 5:00 PM EDT (21:00 UTC)
Expired: Aug 4, 2017, 5:45 PM EDT
In force: 45 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Erie County, NY, Genesee County, NY, Niagara County, NY

The radar

The Buffalo radar (KBUF), 14 km from the middle of the area, began a volume at 21:00 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
Aug 4, 5:08 PM EDT	TSTM WND DMG	2 Sw Cheektowaga, NY	TREE DOWN ON BRIGHT ST. - TIME ESTIMATED BY RADAR
Aug 4, 5:10 PM EDT	TSTM WND DMG	1 N Cheektowaga, NY	TREE DOWN ON CHAPEL AVE. - TIME ESTIMATED BY RADAR

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
Aug 4, 1:25 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.0 hours before the alert went out and 18 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: 243 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

272 
WUUS51 KBUF 042100
SVRBUF
NYC029-037-063-042145-
/O.NEW.KBUF.SV.W.0096.170804T2100Z-170804T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
500 PM EDT FRI AUG 4 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Erie County in western New York...
  Southern Niagara County in western New York...
  Northwestern Genesee County in western New York...

* Until 545 PM EDT.

* At 459 PM EDT, a severe thunderstorm was located over Blasdell, or
  over Lackawanna, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Buffalo, Cheektowaga, West Seneca, North Tonawanda, Clarence,
  Lockport, Lackawanna and Kenmore.

This includes Interstate 90 between exits 57 and 48A.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4318 7905 4311 7825 4267 7880 4279 7893
      4280 7892 4284 7893 4292 7890 4296 7893
      4296 7896 4298 7900 4303 7901 4306 7900
      4307 7902
TIME...MOT...LOC 2059Z 217DEG 45KT 4280 7882 

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

Apffel

2 follow-up statements

628 
WWUS51 KBUF 042123
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
523 PM EDT FRI AUG 4 2017

NYC029-037-063-042145-
/O.CON.KBUF.SV.W.0096.000000T0000Z-170804T2145Z/
Erie NY-Niagara NY-Genesee NY-
523 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHEASTERN ERIE...SOUTHERN NIAGARA AND NORTHWESTERN GENESEE
COUNTIES...

At 523 PM EDT, a severe thunderstorm was located near Pendleton, or
near Clarence, moving northeast at 60 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Buffalo, Cheektowaga, North Tonawanda, Clarence, Lockport, Kenmore,
Amherst and Tonawanda.

This includes Interstate 90 between exits 50 and 49.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4318 7905 4312 7835 4293 7858 4296 7896
      4298 7900 4303 7901 4306 7900 4307 7902
TIME...MOT...LOC 2123Z 242DEG 52KT 4304 7866 

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

Apffel

371 
WWUS51 KBUF 042137
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
537 PM EDT FRI AUG 4 2017

NYC029-037-063-042146-
/O.EXP.KBUF.SV.W.0096.000000T0000Z-170804T2145Z/
Erie NY-Niagara NY-Genesee NY-
537 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ERIE...SOUTHERN
NIAGARA AND NORTHWESTERN GENESEE COUNTIES WILL EXPIRE AT 545 PM
EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM EDT for
western New York.

LAT...LON 4318 7905 4312 7835 4293 7858 4296 7896
      4298 7900 4303 7901 4306 7900 4307 7902
TIME...MOT...LOC 2136Z 217DEG 45KT 4317 7852 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 9:28 PM EDT	Small Craft Advisory	BUF		54 hr
Aug 4, 8:45 AM EDT	Special Weather Statement	BUF	Wayne	30 min
Aug 4, 8:52 AM EDT	Special Marine Warning	BUF		53 min
Aug 4, 11:40 AM EDT	Special Marine Warning	BUF		65 min
Aug 4, 11:53 AM EDT	Special Weather Statement	BUF	Wayne	37 min
Aug 4, 12:22 PM EDT	Special Marine Warning	BUF		53 min
Aug 4, 12:27 PM EDT	Severe Thunderstorm Warning	BUF	Erie	63 min
Aug 4, 12:55 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	50 min
Aug 4, 1:05 PM EDT	Severe Thunderstorm Warning	BUF	Genesee	31 min
Aug 4, 1:08 PM EDT	Special Marine Warning	BUF		52 min
Aug 4, 1:13 PM EDT	Severe Thunderstorm Warning	BUF	Niagara, Orleans	62 min
Aug 4, 1:41 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Wyoming	49 min
Aug 4, 1:59 PM EDT	Special Marine Warning	BUF		61 min
Aug 4, 3:00 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	45 min
Aug 4, 3:22 PM EDT	Special Marine Warning	BUF		53 min
Aug 4, 3:38 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson	57 min
Aug 4, 3:42 PM EDT	Special Marine Warning	BUF		63 min
Aug 4, 4:02 PM EDT	Special Marine Warning	BUF		118 min
Aug 4, 4:14 PM EDT	Special Marine Warning	BUF		61 min
Aug 4, 4:17 PM EDT	Special Marine Warning	BUF		88 min
Aug 4, 4:26 PM EDT	Special Marine Warning	BUF		34 min
Aug 4, 4:27 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Oswego	33 min
Aug 4, 4:45 PM EDT	Special Marine Warning	BUF		2 hr
Aug 4, 4:46 PM EDT	Special Marine Warning	BUF		89 min
Aug 4, 5:04 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	41 min
Aug 4, 5:23 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Livingston	67 min
Aug 4, 5:39 PM EDT	Special Marine Warning	BUF		36 min
Aug 4, 5:51 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	54 min
Aug 4, 6:38 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	52 min
Aug 4, 7:09 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	66 min
Aug 4, 7:15 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Oswego, Wayne	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.