Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 98, NWS Buffalo, NY

August 4, 2017Allegany County, Livingston County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 4, 2017, 5:23 PM EDT for Allegany County, Livingston County, New York. It was in force for 67 min. 1 report 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, 5:23 PM EDT (21:23 UTC)
Expired
Aug 4, 2017, 6:30 PM EDT
In force
67 min
Issued by
NWS Buffalo, NY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Allegany County, NY, Livingston County, NY

The radar

The Buffalo radar (KBUF), 95 km from the middle of the area, began a volume at 21:26 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, 5:48 PM EDTTSTM WND DMG3 Nne Angelica, NYMULTIPLE REPORTS OF TREES AND WIRES 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, 9.4 hours before the alert went out and 91 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°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.

101 
WUUS51 KBUF 042123
SVRBUF
NYC003-051-042230-
/O.NEW.KBUF.SV.W.0098.170804T2123Z-170804T2230Z/

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

The National Weather Service in Buffalo has issued a

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

* Until 630 PM EDT.

* At 523 PM EDT, a severe thunderstorm was located 8 miles east of
  Belfast, or 14 miles west of Hornell, 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...
  Geneseo, Dansville, Letchworth State Park, Mount Morris, Conesus,
  Groveland, Springwater and Nunda.

This includes the following highways...
 Interstate 390 between exits 4 and 7.
 Interstate 86 near exit 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4236 7806 4282 7790 4270 7760 4267 7760
      4267 7752 4266 7749 4263 7749 4258 7755
      4258 7766 4253 7766 4253 7772 4241 7772
      4228 7786
TIME...MOT...LOC 2123Z 205DEG 37KT 4236 7794 

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

Zaff
2 follow-up statements
940 
WWUS51 KBUF 042152
SVSBUF

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

NYC003-051-042230-
/O.CON.KBUF.SV.W.0098.000000T0000Z-170804T2230Z/
Livingston NY-Allegany NY-
552 PM EDT FRI AUG 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SOUTHERN LIVINGSTON AND NORTHEASTERN ALLEGANY COUNTIES...

At 551 PM EDT, severe thunderstorms were located along a line
extending from 7 miles southeast of Belfast to near Portageville,
moving northeast at 35 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...
Geneseo, Dansville, Letchworth State Park, Mount Morris, Conesus,
Groveland, Springwater and Nunda.

This includes the following highways...
 Interstate 390 between exits 4 and 7.
 Interstate 86 near exit 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4236 7806 4282 7790 4270 7760 4267 7760
      4267 7752 4266 7749 4263 7749 4258 7755
      4258 7766 4253 7766 4253 7772 4241 7772
      4228 7786
TIME...MOT...LOC 2151Z 233DEG 31KT 4229 7797 4250 7798 

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

Zaff
427 
WWUS51 KBUF 042226
SVSBUF

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

NYC003-051-042235-
/O.EXP.KBUF.SV.W.0098.000000T0000Z-170804T2230Z/
Livingston NY-Allegany NY-
626 PM EDT FRI AUG 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LIVINGSTON AND
NORTHEASTERN ALLEGANY COUNTIES WILL EXPIRE AT 630 PM EDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned 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 4236 7806 4282 7790 4270 7760 4267 7760
      4267 7752 4266 7749 4263 7749 4258 7755
      4258 7766 4253 7766 4253 7772 4241 7772
      4228 7786
TIME...MOT...LOC 2225Z 205DEG 37KT 4260 7777 4281 7778 

$$

Zaff

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, 5:39 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.