Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 53, NWS Buffalo, NY

August 21, 2018Allegany County, Cattaraugus County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 21, 2018, 7:59 PM EDT for Allegany County, Cattaraugus County, New York. It was in force for 61 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, 7:59 PM EDT (23:59 UTC)
Expired: Aug 21, 2018, 9:00 PM EDT
In force: 61 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegany County, NY, Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 88 km from the middle of the area, began a volume at 00:00 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, 8:45 PM EDT	TSTM WND DMG	Cuba, NY	TREES AND WIRES 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, 12.0 hours before the alert went out and 85 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.

801 
WUUS51 KBUF 212359
SVRBUF
NYC003-009-220100-
/O.NEW.KBUF.SV.W.0053.180821T2359Z-180822T0100Z/

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

The National Weather Service in Buffalo has issued a

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

* Until 900 PM EDT..

* At 756 PM EDT, severe thunderstorms were located along a line 
  extending from central Cattaraugus County to near Allegany State 
  Park, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Olean, Salamanca, Allegany State Park, Allegany, Belfast, Cuba,
  Rushford and St. Bonaventure.

This includes Interstate 86 between exits 17 and 31.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4200 7896 4208 7895 4238 7834 4243 7802
      4234 7784 4200 7857
TIME...MOT...LOC 2356Z 236DEG 20KT 4221 7854 4210 7882 

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

HSK

2 follow-up statements

861 
WWUS51 KBUF 220038
SVSBUF

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

NYC003-009-220100-
/O.CON.KBUF.SV.W.0053.000000T0000Z-180822T0100Z/
Cattaraugus NY-Allegany NY-
838 PM EDT TUE AUG 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHEASTERN CATTARAUGUS AND NORTHERN ALLEGANY COUNTIES...

At 838 PM EDT, severe thunderstorms were located along a line
extending from near Rushford to Olean, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Olean, Allegany State Park, Allegany, Belfast, Cuba, St. Bonaventure,
Weston Mills and Caneadea.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4200 7876 4238 7832 4243 7802 4234 7784
      4200 7857
TIME...MOT...LOC 0038Z 264DEG 30KT 4232 7829 4208 7841 

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

Zaff

269 
WWUS51 KBUF 220104
SVSBUF

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

NYC003-009-220114-
/O.EXP.KBUF.SV.W.0053.000000T0000Z-180822T0100Z/
Cattaraugus NY-Allegany NY-
904 PM EDT TUE AUG 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS AND
NORTHERN ALLEGANY 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.  However gusty
winds and heavy rain are still possible with these thunderstorms.

LAT...LON 4200 7876 4238 7832 4243 7802 4234 7784
      4200 7857
TIME...MOT...LOC 0104Z 236DEG 20KT 4240 7813 4216 7825 

$$

Zaff

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, 6:57 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus	63 min
Aug 21, 7:09 PM EDT	Tornado Warning	BUF	Cattaraugus	36 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.