Alert archive / New York / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 61, NWS Buffalo, NY

July 13, 2021Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 13, 2021, 4:41 PM EDT for Chautauqua County, New York. It was in force for 64 min. 4 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: Jul 13, 2021, 4:41 PM EDT (20:41 UTC)
Expired: Jul 13, 2021, 5:45 PM EDT
In force: 64 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), 79 km from the middle of the area, began a volume at 20:40 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 13, 4:55 PM EDT	TSTM WND DMG	Panama, NY	TREES DOWN IN PANAMA.
Jul 13, 4:55 PM EDT	TSTM WND DMG	Ripley, NY	TREES DOWN IN SOUTH RIPLEY.
Jul 13, 4:55 PM EDT	TSTM WND DMG	Sherman, NY	TREES DOWN IN SHERMAN.
Jul 13, 5:35 PM EDT	TSTM WND DMG	1 S Sherman, NY	TREE DOWN ON I-86 EASTBOUND NEAR EXIT 14.

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
Jul 13, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.7 hours before the alert went out and 79 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: 610 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 907 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

955 
WUUS51 KBUF 132041
SVRBUF
NYC013-132145-
/O.NEW.KBUF.SV.W.0061.210713T2041Z-210713T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
441 PM EDT Tue Jul 13 2021

The National Weather Service in Buffalo has issued a

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

* Until 545 PM EDT..

* At 439 PM EDT, severe thunderstorms were located along a line
  extending from near Northwest Harborcreek to near Riceville to
  Rimersburg, moving northeast at 45 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, Silver Creek,
  Falconer, Mayville, Clymer and Long Point State Park.

 This includes the following highways...
 Interstate 90 between exits 61 and 58.
 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.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Buffalo.

Damaging winds and cloud to ground lightning is occurring with these 
storms. 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 these storms, and may lead to 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4244 7950 4253 7939 4260 7919 4266 7913
      4262 7909 4257 7914 4257 7911 4254 7906
      4200 7906 4200 7976 4227 7976 4228 7973
      4231 7977
TIME...MOT...LOC 2039Z 213DEG 39KT 4208 8000 4182 7972 4104 7954 

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

Welch

1 follow-up statement

749 
WWUS51 KBUF 132119
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
519 PM EDT Tue Jul 13 2021

NYC013-132145-
/O.CON.KBUF.SV.W.0061.000000T0000Z-210713T2145Z/
Chautauqua NY-
519 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CHAUTAUQUA COUNTY...

At 516 PM EDT, severe thunderstorms were located along a line
extending from near Mayville to near Long Point State Park to near
Busti, moving northeast at 45 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, Silver Creek,
Falconer, Mayville, Long Point State Park and Jamestown West.

 This includes the following highways...
 Interstate 90 between exits 60 and 58.
 Interstate 86 between exits 7 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Buffalo.

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

&&

LAT...LON 4200 7944 4213 7945 4234 7964 4253 7939
      4254 7934 4257 7929 4260 7919 4266 7913
      4262 7909 4260 7912 4257 7914 4257 7911
      4254 7906 4200 7906
TIME...MOT...LOC 2116Z 224DEG 38KT 4230 7950 4219 7936 4189 7923 

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

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 3:40 AM EDT	Special Weather Statement	BUF	Lewis	50 min
Jul 13, 1:29 PM EDT	Special Weather Statement	BUF	Erie	46 min
Jul 13, 1:56 PM EDT	Special Marine Warning	BUF		64 min
Jul 13, 2:45 PM EDT	Special Weather Statement	BUF	Monroe	30 min
Jul 13, 3:40 PM EDT	Special Marine Warning	BUF		50 min
Jul 13, 4:34 PM EDT	Special Marine Warning	BUF		56 min
Jul 13, 4:46 PM EDT	Special Weather Statement	BUF	Wayne	44 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	55 min
Jul 13, 4:59 PM EDT	Special Marine Warning	BUF		46 min
Jul 13, 5:23 PM EDT	Severe Thunderstorm Warning	BUF	Oswego	45 min
Jul 13, 5:26 PM EDT	Special Marine Warning	BUF		64 min
Jul 13, 5:33 PM EDT	Special Marine Warning	BUF		42 min
Jul 13, 5:38 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	52 min
Jul 13, 5:41 PM EDT	Severe Thunderstorm Warning	BUF	Lewis, Oswego	64 min
Jul 13, 5:43 PM EDT	Special Weather Statement	BUF	Monroe	32 min
Jul 13, 5:57 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua, Erie, Wyoming	63 min
Jul 13, 6:05 PM EDT	Special Marine Warning	BUF		55 min
Jul 13, 6:07 PM EDT	Special Marine Warning	BUF		38 min
Jul 13, 6:08 PM EDT	Special Marine Warning	BUF		52 min
Jul 13, 6:09 PM EDT	Severe Thunderstorm Warning	BUF	Jefferson, Lewis	53 min
Jul 13, 6:19 PM EDT	Severe Thunderstorm Warning	BUF	Erie, Genesee, Niagara, Orleans	41 min
Jul 13, 6:46 PM EDT	Special Marine Warning	BUF		89 min
Jul 13, 6:55 PM EDT	Severe Thunderstorm Warning	BUF	Niagara, Orleans	50 min
Jul 13, 7:02 PM EDT	Special Marine Warning	BUF		58 min
Jul 13, 7:05 PM EDT	Special Weather Statement	BUF	Jefferson	25 min
Jul 13, 7:07 PM EDT	Special Marine Warning	BUF		53 min
Jul 13, 7:15 PM EDT	Severe Thunderstorm Warning	BUF	Genesee, Livingston, Monroe, Orleans, Wayne	60 min
Jul 13, 7:27 PM EDT	Special Marine Warning	BUF		93 min
Jul 13, 7:41 PM EDT	Special Marine Warning	BUF		94 min

Nearby

Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

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.