Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 102, NWS Buffalo, NY

August 4, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2017, 7:15 PM EDT for 4 counties in New York. It was in force for 60 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, 7:15 PM EDT (23:15 UTC)
Expired
Aug 4, 2017, 8:15 PM EDT
In force
60 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cayuga County, NY, Ontario County, NY, Oswego County, NY, Wayne County, NY

The radar

The Ft Drum radar (KTYX), 93 km from the middle of the area, began a volume at 23:19 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, 7:17 PM EDTTSTM WND DMG6 Wsw Oswego, NYWILLOW TREE DOWN ON W LAKE RD - TIME ESTIMATED BY RADAR
Aug 4, 7:38 PM EDTTSTM WND DMGWolcott, NYTREES AND WIRES DOWN - 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.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.3 hours before the alert went out and 182 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.

864 
WUUS51 KBUF 042315
SVRBUF
NYC011-069-075-117-050015-
/O.NEW.KBUF.SV.W.0102.170804T2315Z-170805T0015Z/

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

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Eastern Wayne County in western New York...
  Cayuga County in central New York...
  Southwestern Oswego County in central New York...
  Northeastern Ontario County in western New York...

* Until 815 PM EDT.

* At 714 PM EDT, a severe thunderstorm was located near Geneva,
  moving northeast at 40 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to trees and power lines. 

* Locations impacted include...
  Oswego, Geneva, Fulton, Fair Haven Beach State Park, Lyons, Clifton
  Springs, Clyde and Phelps.

This includes Interstate 90 between exits 42 and 40.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4327 7620 4324 7621 4322 7619 4320 7621
      4324 7626 4324 7627 4323 7626 4320 7627
      4323 7631 4323 7648 4311 7647 4310 7650
      4303 7650 4301 7696 4276 7698 4276 7707
      4285 7722 4339 7673 4348 7660 4324 7613
TIME...MOT...LOC 2314Z 216DEG 37KT 4286 7706 

HAIL...1.00IN
WIND...60MPH
 
$$

Smith
2 follow-up statements
430 
WWUS51 KBUF 042347
SVSBUF

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

NYC069-042356-
/O.CAN.KBUF.SV.W.0102.000000T0000Z-170805T0015Z/
Ontario NY-
747 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ONTARIO COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4327 7621 4322 7619 4320 7621 4324 7626
      4324 7627 4323 7626 4320 7627 4323 7631
      4323 7648 4315 7647 4314 7649 4311 7647
      4310 7650 4303 7650 4302 7682 4315 7694
      4338 7674 4348 7660 4326 7616
TIME...MOT...LOC 2346Z 223DEG 46KT 4317 7666 

$$

NYC011-075-117-050015-
/O.CON.KBUF.SV.W.0102.000000T0000Z-170805T0015Z/
Wayne NY-Cayuga NY-Oswego NY-
747 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR EASTERN WAYNE...CAYUGA AND SOUTHWESTERN OSWEGO COUNTIES...

At 746 PM EDT, a severe thunderstorm was located near Cato, or 12
miles south of Fair Haven Beach State Park, moving northeast at 55
mph.

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

SOURCE...Radar indicated. 

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         trees and power lines. 

Locations impacted include...
Oswego, Fulton, Fair Haven Beach State Park, Clyde, Weedsport, Cato,
Battle Island State Park and Volney.

This includes Interstate 90 near exit 40.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4327 7621 4322 7619 4320 7621 4324 7626
      4324 7627 4323 7626 4320 7627 4323 7631
      4323 7648 4315 7647 4314 7649 4311 7647
      4310 7650 4303 7650 4302 7682 4315 7694
      4338 7674 4348 7660 4326 7616
TIME...MOT...LOC 2346Z 223DEG 46KT 4317 7666 

HAIL...1.00IN
WIND...60MPH
 
$$

Smith
600 
WWUS51 KBUF 050018
SVSBUF

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

NYC011-075-117-050028-
/O.EXP.KBUF.SV.W.0102.000000T0000Z-170805T0015Z/
Wayne NY-Cayuga NY-Oswego NY-
818 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WAYNE...CAYUGA AND
SOUTHWESTERN OSWEGO COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore the warning has
been allowed to expire.

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

LAT...LON 4327 7621 4322 7619 4320 7621 4324 7626
      4324 7627 4323 7626 4320 7627 4323 7631
      4323 7648 4315 7647 4314 7649 4311 7647
      4310 7650 4303 7650 4302 7682 4315 7694
      4338 7674 4348 7660 4326 7616
TIME...MOT...LOC 0018Z 216DEG 37KT 4342 7641 

$$

Smith

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, 1:41 PM EDTSevere Thunderstorm WarningBUFErie, Genesee, Wyoming49 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

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.