Alert archive / New York / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 135, NWS Buffalo, NY

October 15, 20174 counties in New York

NWS Buffalo, NY issued this severe thunderstorm warning at Oct 15, 2017, 5:15 PM EDT for 4 counties in New York. It was in force for 45 min. 19 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: Oct 15, 2017, 5:15 PM EDT (21:15 UTC)
Expired: Oct 15, 2017, 6:00 PM EDT
In force: 45 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY, Livingston County, NY, Ontario County, NY

The radar

The Buffalo radar (KBUF), 93 km from the middle of the area, began a volume at 21:19 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

Time	Report	Where	Remark
Oct 15, 5:20 PM EDT	TSTM WND DMG	Manchester, NY	MULTIPLE TREES AND WIRES DOWN.
Oct 15, 5:24 PM EDT	TSTM WND DMG	Canadice, NY	TREE DOWN.
Oct 15, 5:24 PM EDT	TSTM WND DMG	Dansville, NY	MULTIPLE TREES AND WIRES DOWN.
Oct 15, 5:24 PM EDT	TSTM WND DMG	Dansville, NY	TREE DOWN ON HOUSE... HARTMAN RD.
Oct 15, 5:24 PM EDT	TSTM WND DMG	Shortsville, NY	TREE DOWN.
Oct 15, 5:25 PM EDT	TSTM WND DMG	1 S Short Tract, NY	TREE AND WIRE DOWN.
Oct 15, 5:25 PM EDT	TSTM WND DMG	Dansville, NY	TREE ON HOUSE... MOREY AVE.
Oct 15, 5:27 PM EDT	TSTM WND DMG	Dansville, NY	TREE ON HOUSE... PARK AVE.
Oct 15, 5:30 PM EDT	TSTM WND DMG	1 E Bloomfield, NY	TREE DOWN.
Oct 15, 5:30 PM EDT	TSTM WND DMG	Springwater, NY	TREES DOWN.
Oct 15, 5:32 PM EDT	TSTM WND DMG	Canandaigua, NY	MULTIPLE TREES AND WIRES DOWN.
Oct 15, 5:36 PM EDT	TSTM WND DMG	1 S Bristol, NY	MULTIPLE TREES DOWN.
Oct 15, 5:36 PM EDT	TSTM WND DMG	Allegany, NY	TREES AND WIRES DOWN.
Oct 15, 5:36 PM EDT	TSTM WND DMG	Canandaigua, NY	TREE DOWN ON HOUSE IN THE TOWN.
Oct 15, 5:36 PM EDT	TSTM WND DMG	Phelps, NY	TREE DOWN ON HOUSE.
Oct 15, 5:42 PM EDT	TSTM WND DMG	Olean, NY	TREES AND WIRES DOWN.
Oct 15, 5:50 PM EDT	TSTM WND DMG	Gorham, NY	MULTIPLE TREES AND WIRES DOWN.
Oct 15, 5:52 PM EDT	TSTM WND DMG	Gorham, NY	TREE DOWN ON HOUSE.
Oct 15, 5:54 PM EDT	TSTM WND DMG	Geneva, NY	MULTIPLE TREES DOWN.

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, 9.3 hours before the alert went out and 89 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: 18 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 961 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

097 
WUUS51 KBUF 152115
SVRBUF
NYC003-009-051-069-152200-
/O.NEW.KBUF.SV.W.0135.171015T2115Z-171015T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
515 PM EDT SUN OCT 15 2017

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cattaraugus County in western New York...
  Southern Livingston County in western New York...
  Allegany County in western New York...
  Ontario County in western New York...

* Until 600 PM EDT.

* At 514 PM EDT, a line of severe thunderstorms was located 7 miles 
  east of Letchworth State Park, extending to Manchester moving east 
  at 55 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Olean, Geneva, Canandaigua, Dansville, Wellsville, Allegany State
  Park, Alfred and Victor.

This includes the following highways...
 Interstate 390 between exits 4 and 6.
 Interstate 90 between exits 43 and 42.
 Interstate 86 between exits 24 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7871 4252 7808 4252 7804 4253 7806
      4270 7786 4299 7743 4299 7696 4276 7698
      4276 7731 4258 7737 4258 7766 4253 7766
      4253 7772 4200 7775
TIME...MOT...LOC 2114Z 258DEG 49KT 4262 7783 

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

Apffel

2 follow-up statements

431 
WWUS51 KBUF 152140
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
540 PM EDT SUN OCT 15 2017

NYC003-009-051-069-152200-
/O.CON.KBUF.SV.W.0135.000000T0000Z-171015T2200Z/
Cattaraugus NY-Livingston NY-Allegany NY-Ontario NY-
540 PM EDT SUN OCT 15 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN CATTARAUGUS...SOUTHEASTERN LIVINGSTON...ALLEGANY AND
CENTRAL ONTARIO COUNTIES...

At 539 PM EDT, a line of severe thunderstorms extended from Olean to 
Dansville to Phelps with this line moving east at 55 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Olean, Geneva, Canandaigua, Dansville, Wellsville, Alfred, Clifton
Springs and Phelps.

This includes the following highways...
 Interstate 390 between exits 4 and 5.
 Interstate 90 near exit 42.
 Interstate 86 between exits 28 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4200 7850 4232 7820 4262 7767 4299 7712
      4299 7696 4276 7698 4276 7731 4258 7737
      4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 2139Z 258DEG 49KT 4269 7737 

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

Apffel

654 
WWUS51 KBUF 152159
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
559 PM EDT SUN OCT 15 2017

NYC003-009-051-069-152208-
/O.EXP.KBUF.SV.W.0135.000000T0000Z-171015T2200Z/
Cattaraugus NY-Livingston NY-Allegany NY-Ontario NY-
559 PM EDT SUN OCT 15 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS...
SOUTHEASTERN LIVINGSTON...ALLEGANY AND CENTRAL ONTARIO COUNTIES WILL
EXPIRE AT 600 PM EDT...
    
The severe thunderstorm which prompted the warning has weakened and 
moved out of the warned area. Therefore, the warning will be allowed 
to expire.

LAT...LON 4200 7850 4232 7820 4262 7767 4299 7712
      4299 7696 4276 7698 4276 7731 4258 7737
      4258 7766 4253 7766 4253 7772 4200 7775
TIME...MOT...LOC 2158Z 258DEG 49KT 4274 7704 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 15, 3:09 PM EDT	Special Marine Warning	BUF		111 min
Oct 15, 3:20 PM EDT	Special Marine Warning	BUF		85 min
Oct 15, 3:37 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara	23 min
Oct 15, 3:56 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie, Genesee, Monroe, Niagara and 2 more	49 min
Oct 15, 4:36 PM EDT	Special Marine Warning	BUF		114 min
Oct 15, 4:36 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Genesee, Livingston, Monroe, Ontario and 2 more	39 min
Oct 15, 4:57 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua	63 min
Oct 15, 5:16 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Oswego, Wayne	44 min
Oct 15, 5:56 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	64 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.