Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 65, NWS Buffalo, NY

September 21, 2018Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Sep 21, 2018, 5:22 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 38 min. 3 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: Sep 21, 2018, 5:22 PM EDT (21:22 UTC)
Expired: Sep 21, 2018, 6:00 PM EDT
In force: 38 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cattaraugus County, NY, Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 98 km from the middle of the area, began a volume at 21:26 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
Sep 21, 5:50 PM EDT	TSTM WND DMG	3 Se Ellery Center, NY	TREES AND WIRES DOWN THROUGHOUT PORTIONS OF CHAUTAUQUA COUNTY.
Sep 21, 5:54 PM EDT	TSTM WND DMG	Gerry, NY	TREE DOWN
Sep 21, 6:02 PM EDT	TSTM WND DMG	Ellington, NY	TREES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 21, 4:50 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.4 hours before the alert went out and 97 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: 445 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 334 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

296 
WUUS51 KBUF 212122
SVRBUF
NYC009-013-212200-
/O.NEW.KBUF.SV.W.0065.180921T2122Z-180921T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
522 PM EDT FRI SEP 21 2018

The National Weather Service in Buffalo has issued a

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

* Until 600 PM EDT..

* At 522 PM EDT, severe thunderstorms were located along a line 
  extending from near Westfield to 5 miles south of Northwest 
  Harborcreek, moving east at 60 to 70 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Jamestown, Salamanca, Allegany State Park, Lakewood, Falconer,
  Mayville, Clymer, Long Point State Park, Jamestown West and Findley
  Lake.

This includes Interstate 86 between exits 4 and 23.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4226 7976 4230 7856 4200 7851 4200 7976
TIME...MOT...LOC 2122Z 248DEG 63KT 4235 7964 4205 8001 

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

RSH

2 follow-up statements

703 
WWUS51 KBUF 212142
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
542 PM EDT FRI SEP 21 2018

NYC009-013-212200-
/O.CON.KBUF.SV.W.0065.000000T0000Z-180921T2200Z/
Cattaraugus NY-Chautauqua NY-
542 PM EDT FRI SEP 21 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHWESTERN CATTARAUGUS AND CHAUTAUQUA COUNTIES...

At 541 PM EDT, severe thunderstorms were located along a line
extending from near Fredonia to near Findley Lake, moving east at 70
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Jamestown, Salamanca, Allegany State Park, Lakewood, Falconer,
Mayville, Clymer, Long Point State Park, Jamestown West and Findley
Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4226 7976 4230 7856 4200 7851 4200 7976
TIME...MOT...LOC 2141Z 248DEG 63KT 4246 7928 4216 7965 

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

Reynolds

200 
WWUS51 KBUF 212200
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
600 PM EDT FRI SEP 21 2018

NYC009-013-212210-
/O.EXP.KBUF.SV.W.0065.000000T0000Z-180921T2200Z/
Cattaraugus NY-Chautauqua NY-
600 PM EDT FRI SEP 21 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CATTARAUGUS AND
CHAUTAUQUA COUNTIES HAS EXPIRED...

The storm which prompted the warning has continued to move east
and now has been replace by another severe thunderstorm warning. 
Therefore, this warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
western New York.

LAT...LON 4226 7976 4230 7856 4200 7851 4200 7976
TIME...MOT...LOC 2200Z 248DEG 63KT 4256 7894 4226 7931 

$$

Reynolds

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 10:00 PM EDT	Beach Hazards Statement	BUF	Chautauqua, Erie, Jefferson, Niagara, Orleans	22 hr
Sep 21, 4:45 PM EDT	Special Marine Warning	BUF		60 min
Sep 21, 5:15 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	45 min
Sep 21, 5:27 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	48 min
Sep 21, 5:54 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Wyoming	66 min
Sep 21, 6:31 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Ontario, Wayne, Wyoming	59 min
Sep 21, 6:38 PM EDT	Special Marine Warning	BUF		70 min
Sep 21, 6:48 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	42 min
Sep 21, 6:51 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	54 min
Sep 21, 7:07 PM EDT	Tornado Warning	BUF	Ontario	23 min
Sep 21, 7:29 PM EDT	Special Marine Warning	BUF		46 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.