Alert archive / New York / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 37, NWS Buffalo, NY

July 16, 2018Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 16, 2018, 7:59 PM EDT for Chautauqua County, New York. It was in force for 46 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: Jul 16, 2018, 7:59 PM EDT (23:59 UTC)
Expired: Jul 16, 2018, 8:45 PM EDT
In force: 46 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), 110 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
Jul 16, 8:55 PM EDT	TSTM WND DMG	Jamestown, NY	TREES 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 110 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: 26 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1384 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS51 KBUF 162359
SVRBUF
NYC013-170045-
/O.NEW.KBUF.SV.W.0037.180716T2359Z-180717T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
759 PM EDT MON JUL 16 2018

The National Weather Service in Buffalo has issued a

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

* Until 845 PM EDT..

* At 757 PM EDT, a severe thunderstorm was located 20 miles 
  southeast of Erie, moving northeast at 45 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Jamestown, Lakewood, Mayville, Clymer, Long Point State Park,
  Jamestown West, Findley Lake and Chautauqua Institute.

# 

This includes Interstate 86 between exits 4 and 12.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

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

&&

LAT...LON 4218 7976 4244 7927 4200 7919 4200 7976
TIME...MOT...LOC 2357Z 239DEG 38KT 4199 7980 

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

RSH

2 follow-up statements

523 
WWUS51 KBUF 170020
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
820 PM EDT MON JUL 16 2018

NYC013-170045-
/O.CON.KBUF.SV.W.0037.000000T0000Z-180717T0045Z/
Chautauqua NY-
820 PM EDT MON JUL 16 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM EDT
FOR SOUTHWESTERN CHAUTAUQUA COUNTY...

At 820 PM EDT, a severe thunderstorm was located over Clymer, or 20
miles west of Jamestown, moving northeast at 30 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Lakewood, Mayville, Clymer, Findley Lake, Long Point State Park,
Chautauqua Institute, Chautauqua and Busti.

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.

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

&&

LAT...LON 4238 7939 4200 7927 4200 7976 4218 7976
TIME...MOT...LOC 0020Z 241DEG 26KT 4203 7962 

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

RSH

406 
WWUS51 KBUF 170043
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
843 PM EDT MON JUL 16 2018

NYC013-170053-
/O.EXP.KBUF.SV.W.0037.000000T0000Z-180717T0045Z/
Chautauqua NY-
843 PM EDT MON JUL 16 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHAUTAUQUA COUNTY
WILL EXPIRE AT 845 PM EDT...
                
The storms which prompted the warning have weakened below severe 
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with these thunderstorms.

LAT...LON 4238 7939 4200 7927 4200 7976 4218 7976
TIME...MOT...LOC 0043Z 239DEG 38KT 4212 7941 

$$

RSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 4:17 PM EDT	Special Weather Statement	BUF	Monroe	43 min
Jul 16, 4:28 PM EDT	Severe Thunderstorm Warning	BUF	Monroe	47 min
Jul 16, 4:46 PM EDT	Special Marine Warning	BUF		59 min
Jul 16, 4:53 PM EDT	Severe Thunderstorm Warning	BUF	Monroe, Wayne	44 min
Jul 16, 5:14 PM EDT	Severe Thunderstorm Warning	BUF	Ontario, Wayne	61 min
Jul 16, 5:23 PM EDT	Special Weather Statement	BUF	Allegany	37 min
Jul 16, 5:56 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego, Wayne	29 min
Jul 16, 5:59 PM EDT	Special Marine Warning	BUF		34 min
Jul 16, 7:10 PM EDT	Flash Flood Warning	BUF	Allegany	3 hr
Jul 16, 7:22 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	38 min
Jul 16, 7:42 PM EDT	Special Marine Warning	BUF		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.