Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 52, NWS Buffalo, NY

August 21, 2018Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 21, 2018, 6:57 PM EDT for Cattaraugus County, New York. It was in force for 63 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 21, 2018, 6:57 PM EDT (22:57 UTC)
Expired: Aug 21, 2018, 8:00 PM EDT
In force: 63 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 91 km from the middle of the area, began a volume at 23:01 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 21, 7:06 PM EDT	TSTM WND DMG	4 Sse Steamburg, NY	TREE DOWN AT THE QUAKER ENTRANCE OF ALLEGANY STATE PARK

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, 11.0 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: 103 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 790 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

448 
WUUS51 KBUF 212257
SVRBUF
NYC009-220000-
/O.NEW.KBUF.SV.W.0052.180821T2257Z-180822T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
657 PM EDT TUE AUG 21 2018

The National Weather Service in Buffalo has issued a

* Severe Thunderstorm Warning for...
  Central Cattaraugus County in western New York...

* Until 800 PM EDT..

* At 657 PM EDT, a severe thunderstorm was located 9 miles northeast
  of Scandia, or 10 miles west of Allegany State Park, moving
  northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Salamanca, Allegany State Park, Ashford, Franklinville, Great
  Valley, Carrollton, Little Valley and Ischua.

This includes Interstate 86 between exits 17 and 21.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Allegheny Reservoir, get away from the water and move 
indoors or inside a vehicle. Remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4200 7904 4203 7906 4206 7906 4249 7853
      4227 7831 4223 7831 4200 7884
TIME...MOT...LOC 2257Z 228DEG 27KT 4203 7897 

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

HSK

1 follow-up statement

431 
WWUS51 KBUF 212344
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
744 PM EDT TUE AUG 21 2018

NYC009-220000-
/O.CON.KBUF.SV.W.0052.000000T0000Z-180822T0000Z/
Cattaraugus NY-
744 PM EDT TUE AUG 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL CATTARAUGUS COUNTY...

At 743 PM EDT, a severe thunderstorm was located near Salamanca,
moving northeast at 25 mph. 

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Salamanca, Allegany State Park, Ashford, Franklinville, Great Valley,
Carrollton, Little Valley and Ischua.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Allegheny Reservoir, get away from the water and move 
indoors or inside a vehicle. remember, lightning can strike out to 
15 miles from the parent thunderstorm. If you can hear thunder, you 
are close enough to be struck by lightning. Move to safe shelter 
now!  Do not be caught on the water in a thunderstorm.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4200 7904 4203 7906 4206 7906 4249 7853
      4227 7831 4223 7831 4200 7884
TIME...MOT...LOC 2343Z 243DEG 23KT 4217 7862 

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

HSK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 4:45 AM EDT	Small Craft Advisory	BUF		45 hr
Aug 21, 4:07 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	53 min
Aug 21, 4:59 PM EDT	Special Weather Statement	BUF	Cattaraugus	31 min
Aug 21, 5:06 PM EDT	Special Weather Statement	BUF	Chautauqua	24 min
Aug 21, 5:20 PM EDT	Special Marine Warning	BUF		85 min
Aug 21, 5:32 PM EDT	Special Weather Statement	BUF	Chautauqua	43 min
Aug 21, 5:54 PM EDT	Special Weather Statement	BUF	Niagara	36 min
Aug 21, 6:03 PM EDT	Severe Thunderstorm Warning	BUF	Niagara	27 min
Aug 21, 6:12 PM EDT	Special Marine Warning	BUF		63 min
Aug 21, 6:21 PM EDT	Special Marine Warning	BUF		54 min
Aug 21, 6:26 PM EDT	Special Weather Statement	BUF	Niagara	64 min
Aug 21, 6:38 PM EDT	Special Marine Warning	BUF		97 min
Aug 21, 6:38 PM EDT	Special Weather Statement	BUF	Cattaraugus	37 min
Aug 21, 6:54 PM EDT	Special Weather Statement	BUF	Chautauqua	36 min
Aug 21, 7:09 PM EDT	Tornado Warning	BUF	Cattaraugus	36 min
Aug 21, 7:59 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	61 min

Nearby

Severe Thunderstorm Warnings in New York, 2018 Every severe thunderstorm warning in 2018

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.