Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 59, NWS Buffalo, NY

July 16, 2020Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Jul 16, 2020, 7:17 PM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 43 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: Jul 16, 2020, 7:17 PM EDT (23:17 UTC)
Expired: Jul 16, 2020, 8:00 PM EDT
In force: 43 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), 93 km from the middle of the area, began a volume at 23:20 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, 7:26 PM EDT	TSTM WND DMG	1 Ene East Randolph, NY	TREES AND WIRES DOWN ON RT 242.
Jul 16, 7:28 PM EDT	TSTM WND DMG	Randolph, NY	PORCH ROOF BLOWN OFF OF THE HOUSE.
Jul 16, 7:30 PM EDT	TSTM WND DMG	Napoli, NY	TREE DOWN ON A HOUSE.
Jul 16, 7:50 PM EDT	TSTM WND DMG	Allegany, NY	TREES AND WIRES DOWN.
Jul 16, 7:53 PM EDT	TSTM WND DMG	Salamanca, NY	TREES AND WIRES 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
Jul 16, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 11.3 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: 12 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

647 
WUUS51 KBUF 162317
SVRBUF
NYC009-013-170000-
/O.NEW.KBUF.SV.W.0059.200716T2317Z-200717T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
717 PM EDT Thu Jul 16 2020

The National Weather Service in Buffalo has issued a

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

* Until 800 PM EDT..

* At 716 PM EDT, a severe thunderstorm was located near Frewsburg, or
  7 miles east of Jamestown, moving east at 40 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, Olean, Salamanca, Allegany State Park, Falconer,
  Ashford, Allegany, St. Bonaventure, Frewsburg and Great Valley.

 This includes Interstate 86 between exits 12 and 25.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4200 7923 4218 7927 4242 7852 4200 7840
TIME...MOT...LOC 2316Z 251DEG 34KT 4206 7909 

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

Mitchell

2 follow-up statements

558 
WWUS51 KBUF 162350
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
750 PM EDT Thu Jul 16 2020

NYC013-162356-
/O.CAN.KBUF.SV.W.0059.000000T0000Z-200717T0000Z/
Chautauqua NY-
750 PM EDT Thu Jul 16 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHCENTRAL CHAUTAUQUA COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
western New York.

LAT...LON 4200 7886 4232 7883 4242 7852 4212 7843
      4200 7840
TIME...MOT...LOC 2346Z 251DEG 34KT 4215 7872 

$$

NYC009-170000-
/O.CON.KBUF.SV.W.0059.000000T0000Z-200717T0000Z/
Cattaraugus NY-
750 PM EDT Thu Jul 16 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTHEASTERN CATTARAUGUS COUNTY...

At 746 PM EDT, a severe thunderstorm was located over Salamanca,
moving east at 40 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, Ashford, Allegany, St.
Bonaventure, Great Valley, Carrollton, Little Valley and Humphrey.

 This includes Interstate 86 between exits 18 and 26.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4200 7886 4232 7883 4242 7852 4212 7843
      4200 7840
TIME...MOT...LOC 2346Z 251DEG 34KT 4215 7872 

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

Mitchell

402 
WWUS51 KBUF 170003
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
803 PM EDT Thu Jul 16 2020

NYC009-170011-
/O.EXP.KBUF.SV.W.0059.000000T0000Z-200717T0000Z/
Cattaraugus NY-
803 PM EDT Thu Jul 16 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CATTARAUGUS
COUNTY HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire. However gusty 
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
western New York.

Remember, a separate Severe Thunderstorm Warning still remains in 
effect for far southeastern Cattaraugus County.

LAT...LON 4200 7886 4232 7883 4242 7852 4212 7843
      4200 7840
TIME...MOT...LOC 0001Z 251DEG 34KT 4219 7857 

$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 4:11 AM EDT	Small Craft Advisory	BUF		28 hr
Jul 16, 11:28 AM EDT	Special Weather Statement	BUF	Genesee	32 min
Jul 16, 11:57 AM EDT	Special Weather Statement	BUF	Genesee	33 min
Jul 16, 12:09 PM EDT	Special Marine Warning	BUF		66 min
Jul 16, 12:33 PM EDT	Special Weather Statement	BUF	Monroe	27 min
Jul 16, 12:37 PM EDT	Severe Thunderstorm Warning	BUF	Monroe	38 min
Jul 16, 1:42 PM EDT	Special Marine Warning	BUF		93 min
Jul 16, 2:12 PM EDT	Special Marine Warning	BUF		22 min
Jul 16, 2:39 PM EDT	Special Weather Statement	BUF	Oswego	36 min
Jul 16, 3:04 PM EDT	Special Marine Warning	BUF		41 min
Jul 16, 3:48 PM EDT	Special Marine Warning	BUF		57 min
Jul 16, 3:52 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	53 min
Jul 16, 3:53 PM EDT	Special Marine Warning	BUF		67 min
Jul 16, 4:07 PM EDT	Tornado Warning	BUF	Cattaraugus, Chautauqua, Erie	38 min
Jul 16, 4:08 PM EDT	Special Marine Warning	BUF		53 min
Jul 16, 4:13 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	62 min
Jul 16, 4:23 PM EDT	Special Weather Statement	BUF	Monroe	67 min
Jul 16, 4:44 PM EDT	Special Weather Statement	BUF	Erie	46 min
Jul 16, 5:02 PM EDT	Special Weather Statement	BUF	Genesee	43 min
Jul 16, 5:12 PM EDT	Special Weather Statement	BUF	Cattaraugus, Erie	63 min
Jul 16, 5:14 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	46 min
Jul 16, 5:36 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua	24 min
Jul 16, 5:49 PM EDT	Areal Flood Warning	BUF	Chautauqua, Erie, Genesee, Wyoming	3 hr
Jul 16, 5:50 PM EDT	Special Weather Statement	BUF	Genesee, Livingston, Ontario, Wayne	55 min
Jul 16, 5:50 PM EDT	Tornado Warning	BUF	Cattaraugus, Chautauqua	40 min
Jul 16, 5:58 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Erie, Wyoming	47 min
Jul 16, 6:32 PM EDT	Tornado Warning	BUF	Cattaraugus	28 min
Jul 16, 6:42 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Chautauqua	3 hr
Jul 16, 6:50 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	40 min
Jul 16, 6:59 PM EDT	Tornado Warning	BUF	Cattaraugus	31 min
Jul 16, 7:15 PM EDT	Flash Flood Warning	BUF	Allegany, Cattaraugus	4 hr
Jul 16, 7:42 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	48 min

Nearby

Severe Thunderstorm Warnings in New York, 2020 Every severe thunderstorm warning in 2020

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.