Alert archive / New York / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 77, NWS Buffalo, NY

August 15, 2019Allegany County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 15, 2019, 4:21 PM EDT for Allegany County, New York. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 15, 2019, 4:21 PM EDT (20:21 UTC)
Expired: Aug 15, 2019, 5:15 PM EDT
In force: 54 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

County Allegany County, NY

The radar

The Buffalo radar (KBUF), 85 km from the middle of the area, began a volume at 20:24 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.4 hours before the alert went out and 81 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: 1667 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

880 
WUUS51 KBUF 152021
SVRBUF
NYC003-152115-
/O.NEW.KBUF.SV.W.0077.190815T2021Z-190815T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
421 PM EDT Thu Aug 15 2019

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Northern Allegany County in western New York...

* Until 515 PM EDT..

* At 420 PM EDT, a severe thunderstorm was located near Houghton, or
  20 miles southwest of Letchworth State Park, moving east at 15 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Belfast, Rushford, Houghton, Caneadea, Angelica, West Almond,
  Birdsall, Short Tract and Fillmore.

 This includes Interstate 86 between exits 31 and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This storm has shown some rotation. While not imminent, 
a tornado may develop.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4232 7826 4245 7825 4251 7788 4238 7784
      4226 7786
TIME...MOT...LOC 2020Z 269DEG 13KT 4238 7816 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Hitchcock

3 follow-up statements

868 
WWUS51 KBUF 152043
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
443 PM EDT Thu Aug 15 2019

NYC003-152115-
/O.CON.KBUF.SV.W.0077.000000T0000Z-190815T2115Z/
Allegany NY-
443 PM EDT Thu Aug 15 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN ALLEGANY COUNTY...

At 442 PM EDT, a severe thunderstorm was located near Belfast, or 18
miles south of Letchworth State Park, moving east at 15 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Belfast, Angelica, West Almond, Birdsall and Short Tract. 

 This includes Interstate 86 between exits 31 and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This storm has shown some rotation. While not imminent, 
a tornado may develop.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4230 7812 4246 7810 4251 7788 4238 7784
      4226 7786
TIME...MOT...LOC 2042Z 264DEG 15KT 4239 7803 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Hitchcock

311 
WWUS51 KBUF 152104
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
504 PM EDT Thu Aug 15 2019

NYC003-152115-
/O.CON.KBUF.SV.W.0077.000000T0000Z-190815T2115Z/
Allegany NY-
504 PM EDT Thu Aug 15 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN ALLEGANY COUNTY...

At 504 PM EDT, a severe thunderstorm was located 10 miles west of
Arkport, or 12 miles west of Hornell, moving east at 15 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
West Almond and Birdsall. 

 This includes Interstate 86 near exit 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4228 7800 4249 7798 4251 7788 4238 7784
      4226 7786
TIME...MOT...LOC 2104Z 271DEG 14KT 4238 7789 

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

Hitchcock

894 
WWUS51 KBUF 152115
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
515 PM EDT Thu Aug 15 2019

NYC003-152124-
/O.EXP.KBUF.SV.W.0077.000000T0000Z-190815T2115Z/
Allegany NY-
515 PM EDT Thu Aug 15 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ALLEGANY COUNTY
WILL EXPIRE AT 515 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A separate Severe Thunderstorm Warning remains in effect for 
southern Allegany County.

LAT...LON 4228 7800 4249 7798 4251 7788 4238 7784
      4226 7786
TIME...MOT...LOC 2114Z 269DEG 13KT 4238 7785 

$$

Hitchcock

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 2:48 PM EDT	Special Weather Statement	BUF	Cattaraugus	42 min
Aug 15, 3:18 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Aug 15, 3:39 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Wyoming	51 min
Aug 15, 3:55 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	50 min
Aug 15, 4:33 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	57 min
Aug 15, 4:43 PM EDT	Special Weather Statement	BUF	Monroe	47 min
Aug 15, 4:45 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Monroe, Ontario	27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.