Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Buffalo, NY

June 18, 2018Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jun 18, 2018, 6:39 PM EDT for Chautauqua County, New York. It was in force for 66 min. 5 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: Jun 18, 2018, 6:39 PM EDT (22:39 UTC)
Expired: Jun 18, 2018, 7:45 PM EDT
In force: 66 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Chautauqua County, NY

The radar

The Buffalo radar (KBUF), 92 km from the middle of the area, began a volume at 22:43 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
Jun 18, 7:00 PM EDT	TSTM WND DMG	Portland, NY	TREE DOWN IN TOWN OF PORTLAND
Jun 18, 7:17 PM EDT	TSTM WND DMG	Ellery Center, NY	MULTIPLE REPORTS OF TREES AND WIRES DOWN.
Jun 18, 7:24 PM EDT	TSTM WND DMG	Gerry, NY	MULTIPLE REPORTS OF TREES AND WIRES DOWN.
Jun 18, 7:26 PM EDT	TSTM WND DMG	1 N Celoron, NY	MULTIPLE REPORTS OF TREES AND WIRES DOWN.
Jun 18, 7:29 PM EDT	TSTM WND DMG	E Jamestown, NY	TREE FELL ON A HOUSE ON WILLARD ST IN JAMESTOWN.

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, 10.7 hours before the alert went out and 92 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: 776 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

313 
WUUS51 KBUF 182239
SVRBUF
NYC013-182345-
/O.NEW.KBUF.SV.W.0021.180618T2239Z-180618T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
639 PM EDT MON JUN 18 2018

The National Weather Service in Buffalo has issued a

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

* Until 745 PM EDT..

* At 637 PM EDT, a severe thunderstorm was located 11 miles northwest
  of North East, or 18 miles northeast of Erie, moving east at 50
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Jamestown, Dunkirk, Fredonia, Westfield, Lakewood, Falconer,
  Mayville and Clymer.

# 

This includes the following highways...
 Interstate 90 between exits 61 and 59.
 Interstate 86 between exits 4 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Chautauqua Lake, 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.

&&

LAT...LON 4244 7950 4248 7947 4253 7939 4254 7934
      4241 7906 4200 7906 4200 7976 4227 7976
      4228 7973 4231 7977
TIME...MOT...LOC 2237Z 289DEG 44KT 4237 7993 

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

Thomas

2 follow-up statements

998 
WWUS51 KBUF 182319
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
719 PM EDT MON JUN 18 2018

NYC013-182345-
/O.CON.KBUF.SV.W.0021.000000T0000Z-180618T2345Z/
Chautauqua NY-
719 PM EDT MON JUN 18 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR CHAUTAUQUA COUNTY...

At 716 PM EDT, a severe thunderstorm was located 10 miles northeast
of Long Point State Park, or 11 miles north of Jamestown, moving east
at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Jamestown, Dunkirk, Fredonia, Lakewood, Falconer, Mayville, Clymer
and Long Point State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Chautauqua Lake, 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.

&&

LAT...LON 4236 7945 4248 7931 4241 7906 4200 7906
      4200 7976 4206 7976 4221 7966
TIME...MOT...LOC 2316Z 287DEG 47KT 4227 7925 

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

Thomas

306 
WWUS51 KBUF 182347
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
747 PM EDT MON JUN 18 2018

NYC013-182355-
/O.EXP.KBUF.SV.W.0021.000000T0000Z-180618T2345Z/
Chautauqua NY-
747 PM EDT MON JUN 18 2018

...THE SEVERE THUNDERSTORM WARNING FOR CHAUTAUQUA COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
southeastern Chautauqua County until 830 pm.

LAT...LON 4236 7945 4248 7931 4241 7906 4200 7906
      4200 7976 4206 7976 4221 7966
TIME...MOT...LOC 2345Z 291DEG 35KT 4205 7908 

$$

Thomas

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 12:59 PM EDT	Special Marine Warning	BUF		61 min
Jun 18, 1:19 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	41 min
Jun 18, 1:20 PM EDT	Special Marine Warning	BUF		40 min
Jun 18, 1:35 PM EDT	Special Marine Warning	BUF		55 min
Jun 18, 2:10 PM EDT	Special Weather Statement	BUF	Lewis	35 min
Jun 18, 2:14 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis, Oswego	46 min
Jun 18, 2:16 PM EDT	Special Marine Warning	BUF		59 min
Jun 18, 2:32 PM EDT	Special Marine Warning	BUF		18 min
Jun 18, 2:39 PM EDT	Small Craft Advisory	BUF		3 hr
Jun 18, 2:40 PM EDT	Special Weather Statement	BUF	Erie	35 min
Jun 18, 3:56 PM EDT	Special Marine Warning	BUF		94 min
Jun 18, 6:00 PM EDT	Special Weather Statement	BUF	Livingston, Wyoming	60 min
Jun 18, 6:24 PM EDT	Special Marine Warning	BUF		66 min
Jun 18, 6:33 PM EDT	Special Weather Statement	BUF	Erie, Wyoming	57 min
Jun 18, 6:45 PM EDT	Special Marine Warning	BUF		45 min
Jun 18, 7:27 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua	63 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.