Alert archive / New York / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 98, NWS Buffalo, NY

August 18, 2019Allegany County, Livingston County, Ontario County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 18, 2019, 7:03 PM EDT for Allegany County, Livingston County, Ontario County, New York. It was in force for 42 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 18, 2019, 7:03 PM EDT (23:03 UTC)
Expired: Aug 18, 2019, 7:45 PM EDT
In force: 42 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Buffalo radar (KBUF), 102 km from the middle of the area, began a volume at 23:06 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 18, 7:05 PM EDT	TSTM WND DMG	2 Ssw Union Corners, NY	TREES AND POWERLINES DOWN IN THE TOWN OF NUNDA
Aug 18, 7:06 PM EDT	TSTM WND DMG	1 Nne Tuscarora, NY	TREES AND POWERLINES DOWN IN THE TOWN OF MOUNT MORRIS

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, 11.1 hours before the alert went out and 98 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1370 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

354 
WUUS51 KBUF 182303
SVRBUF
NYC003-051-069-182345-
/O.NEW.KBUF.SV.W.0098.190818T2303Z-190818T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
703 PM EDT Sun Aug 18 2019

The National Weather Service in Buffalo has issued a

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

* Until 745 PM EDT..

* At 702 PM EDT, severe thunderstorms were located along a line
  extending from near Geneseo to near Portageville, moving east at 30
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Geneseo, Dansville, Letchworth State Park, Mount Morris, Conesus,
  Naples, Rushville, Hemlock, Honeoye and Gorham.

 This includes Interstate 390 between exits 4 and 8.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4249 7803 4283 7789 4284 7702 4276 7706
      4276 7732 4267 7737 4258 7737 4258 7766
      4253 7766 4253 7772 4246 7773
TIME...MOT...LOC 2302Z 275DEG 25KT 4277 7785 4251 7797 

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

JJR

2 follow-up statements

460 
WWUS51 KBUF 182325
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
725 PM EDT Sun Aug 18 2019

NYC003-051-069-182345-
/O.CON.KBUF.SV.W.0098.000000T0000Z-190818T2345Z/
Livingston NY-Allegany NY-Ontario NY-
725 PM EDT Sun Aug 18 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR SOUTHEASTERN LIVINGSTON...NORTHEASTERN ALLEGANY AND SOUTHERN
ONTARIO COUNTIES...

At 725 PM EDT, severe thunderstorms were located along a line
extending from near Conesus to 7 miles southwest of Dansville, moving
east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Dansville, Conesus, Naples, Rushville, Honeoye, Hemlock, Gorham,
Groveland, Springwater and Canadice.

 This includes Interstate 390 between exits 4 and 5.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4248 7790 4283 7772 4284 7702 4276 7706
      4276 7732 4267 7737 4258 7737 4258 7766
      4253 7766 4253 7772 4246 7773
TIME...MOT...LOC 2325Z 275DEG 25KT 4276 7769 4250 7781 

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

JJR

138 
WWUS51 KBUF 182345
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
745 PM EDT Sun Aug 18 2019

NYC003-051-069-182355-
/O.EXP.KBUF.SV.W.0098.000000T0000Z-190818T2345Z/
Livingston NY-Allegany NY-Ontario NY-
745 PM EDT Sun Aug 18 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON...
NORTHEASTERN ALLEGANY AND SOUTHERN ONTARIO COUNTIES HAS EXPIRED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been allowed to expire.

LAT...LON 4248 7790 4283 7772 4284 7702 4276 7706
      4276 7732 4267 7737 4258 7737 4258 7766
      4253 7766 4253 7772 4246 7773
TIME...MOT...LOC 2345Z 275DEG 25KT 4275 7753 4249 7765 

$$

JJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 5:49 AM EDT	Special Marine Warning	BUF		86 min
Aug 18, 6:13 AM EDT	Special Weather Statement	BUF	Erie	92 min
Aug 18, 7:15 AM EDT	Special Weather Statement	BUF	Genesee	30 min
Aug 18, 7:35 AM EDT	Special Weather Statement	BUF	Livingston, Wyoming	40 min
Aug 18, 8:04 AM EDT	Special Marine Warning	BUF		56 min
Aug 18, 8:04 AM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	41 min
Aug 18, 8:46 AM EDT	Special Weather Statement	BUF	Chautauqua	44 min
Aug 18, 3:02 PM EDT	Special Weather Statement	BUF	Cayuga	43 min
Aug 18, 3:14 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Wayne	46 min
Aug 18, 3:16 PM EDT	Special Weather Statement	BUF	Livingston, Ontario, Wayne, Wyoming	44 min
Aug 18, 3:36 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	43 min
Aug 18, 4:16 PM EDT	Flash Flood Warning	BUF	Ontario	3 hr
Aug 18, 4:43 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	62 min
Aug 18, 5:54 PM EDT	Special Weather Statement	BUF	Lewis	51 min
Aug 18, 6:57 PM EDT	Special Weather Statement	BUF	Livingston	48 min

Nearby

Severe Thunderstorm Warnings in New York, 2019 Every severe thunderstorm warning in 2019

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.