Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 92, NWS Buffalo, NY

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

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2017, 1:41 PM EDT for Erie County, Genesee County, Wyoming County, New York. It was in force for 49 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, 1:41 PM EDT (17:41 UTC)
Expired
Aug 4, 2017, 2:30 PM EDT
In force
49 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, Wyoming County, NY

The radar

The Buffalo radar (KBUF), 15 km from the middle of the area, began a volume at 17:41 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
Aug 4, 1:43 PM EDTTSTM WND DMGHamburg, NYSEVERAL TREES DOWN IN THE VILLAGE OF HAMBURG
Aug 4, 1:59 PM EDTTSTM WND DMGElma, NYTREE 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.

IssuedProductOfficeLasted
Aug 4, 1:25 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.7 hours before the alert went out and 12 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 12:00Z on 2017-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 243 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 12:00Z on 2017-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.193958Sfc1 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
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.

883 
WUUS51 KBUF 041741
SVRBUF
NYC029-037-121-041830-
/O.NEW.KBUF.SV.W.0092.170804T1741Z-170804T1830Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northwestern Wyoming County in western New York...
  Northeastern Erie County in western New York...
  Southwestern Genesee County in western New York...

* Until 230 PM EDT.

* At 141 PM EDT, a severe thunderstorm was located over Hamburg,
  moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Buffalo, Cheektowaga, West Seneca, Clarence, Lackawanna, Depew,
  Lancaster and Hamburg.

This includes Interstate 90 between exits 57 and 54, and near exit
48A.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4309 7848 4309 7846 4290 7818 4261 7876
      4274 7896
TIME...MOT...LOC 1741Z 228DEG 37KT 4273 7885 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel
3 follow-up statements
215 
WWUS51 KBUF 041757
SVSBUF

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

NYC029-037-121-041830-
/O.CON.KBUF.SV.W.0092.000000T0000Z-170804T1830Z/
Wyoming NY-Erie NY-Genesee NY-
157 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHWESTERN WYOMING...NORTHEASTERN ERIE AND SOUTHWESTERN GENESEE
COUNTIES...

At 157 PM EDT, a severe thunderstorm was located over Elma, or near
West Seneca, moving northeast at 45 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Buffalo, Cheektowaga, West Seneca, Clarence, Lackawanna, Depew,
Lancaster and East Aurora.

This includes Interstate 90 between exits 55 and 54, and near exit
48A.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4309 7848 4309 7846 4290 7818 4268 7863
      4283 7884
TIME...MOT...LOC 1757Z 228DEG 37KT 4284 7868 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel
126 
WWUS51 KBUF 041811
SVSBUF

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

NYC029-037-121-041830-
/O.CON.KBUF.SV.W.0092.000000T0000Z-170804T1830Z/
Wyoming NY-Erie NY-Genesee NY-
211 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM EDT
FOR NORTHWESTERN WYOMING...NORTHEASTERN ERIE AND SOUTHWESTERN GENESEE
COUNTIES...

At 210 PM EDT, a severe thunderstorm was located near Alden, or near
Clarence, moving northeast at 35 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Clarence, Depew, Lancaster, Darien Lakes State Park, Marilla,
Pembroke, Bennington and Akron.

This includes Interstate 90 near exit 48A.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4309 7848 4309 7846 4290 7818 4276 7851
      4291 7870
TIME...MOT...LOC 1810Z 233DEG 29KT 4290 7856 

HAIL...0.75IN
WIND...60MPH
 
$$

Apffel
924 
WWUS51 KBUF 041829
SVSBUF

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

NYC029-037-121-041838-
/O.EXP.KBUF.SV.W.0092.000000T0000Z-170804T1830Z/
Wyoming NY-Erie NY-Genesee NY-
229 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WYOMING...
NORTHEASTERN ERIE AND SOUTHWESTERN GENESEE COUNTIES WILL EXPIRE AT
230 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
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 4309 7848 4309 7846 4290 7818 4276 7851
      4291 7870
TIME...MOT...LOC 1828Z 228DEG 37KT 4301 7839 

$$

Apffel

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 9:28 PM EDTSmall Craft AdvisoryBUF54 hr
Aug 4, 8:45 AM EDTSpecial Weather StatementBUFWayne30 min
Aug 4, 8:52 AM EDTSpecial Marine WarningBUF53 min
Aug 4, 11:40 AM EDTSpecial Marine WarningBUF65 min
Aug 4, 11:53 AM EDTSpecial Weather StatementBUFWayne37 min
Aug 4, 12:22 PM EDTSpecial Marine WarningBUF53 min
Aug 4, 12:27 PM EDTSevere Thunderstorm WarningBUFErie63 min
Aug 4, 12:55 PM EDTSevere Thunderstorm WarningBUFCattaraugus, Chautauqua, Erie50 min
Aug 4, 1:05 PM EDTSevere Thunderstorm WarningBUFGenesee31 min
Aug 4, 1:08 PM EDTSpecial Marine WarningBUF52 min
Aug 4, 1:13 PM EDTSevere Thunderstorm WarningBUFNiagara, Orleans62 min
Aug 4, 1:59 PM EDTSpecial Marine WarningBUF61 min
Aug 4, 3:00 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis, Oswego45 min
Aug 4, 3:22 PM EDTSpecial Marine WarningBUF53 min
Aug 4, 3:38 PM EDTSevere Thunderstorm WarningBUFJefferson57 min
Aug 4, 3:42 PM EDTSpecial Marine WarningBUF63 min
Aug 4, 4:02 PM EDTSpecial Marine WarningBUF118 min
Aug 4, 4:14 PM EDTSpecial Marine WarningBUF61 min
Aug 4, 4:17 PM EDTSpecial Marine WarningBUF88 min
Aug 4, 4:26 PM EDTSpecial Marine WarningBUF34 min
Aug 4, 4:27 PM EDTSevere Thunderstorm WarningBUFJefferson, Oswego33 min
Aug 4, 4:45 PM EDTSpecial Marine WarningBUF2 hr
Aug 4, 4:46 PM EDTSpecial Marine WarningBUF89 min
Aug 4, 5:00 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Niagara45 min
Aug 4, 5:04 PM EDTSevere Thunderstorm WarningBUFCayuga, Oswego41 min
Aug 4, 5:23 PM EDTSevere Thunderstorm WarningBUFAllegany, Livingston67 min
Aug 4, 5:39 PM EDTSpecial Marine WarningBUF36 min
Aug 4, 5:51 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis, Oswego54 min
Aug 4, 6:38 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis52 min
Aug 4, 7:09 PM EDTSevere Thunderstorm WarningBUFJefferson, Lewis, Oswego66 min
Aug 4, 7:15 PM EDTSevere Thunderstorm WarningBUFCayuga, Ontario, Oswego, Wayne60 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.