Alert archive / New York / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 88, NWS Buffalo, NY

August 25, 2020Cattaraugus County, Chautauqua County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Aug 25, 2020, 3:45 AM EDT for Cattaraugus County, Chautauqua County, New York. It was in force for 60 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: Aug 25, 2020, 3:45 AM EDT (07:45 UTC)
Expired: Aug 25, 2020, 4:45 AM EDT
In force: 60 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon
Hail: 1.0 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 07:45 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
Aug 25, 4:11 AM EDT	TSTM WND DMG	Lakewood, NY	TREE DOWN BLOCKING ROAD IN LAKEWOOD. TIME ESTIMATED BASED UPON RADAR.

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 00:00Z, 7.8 hours before the alert went out and 98 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: 364 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

147 
WUUS51 KBUF 250745
SVRBUF
NYC009-013-250845-
/O.NEW.KBUF.SV.W.0088.200825T0745Z-200825T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Buffalo NY
345 AM EDT Tue Aug 25 2020

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 445 AM EDT..

* At 344 AM EDT, a severe thunderstorm was located over Westfield, or
  15 miles southwest of Fredonia, moving southeast at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Jamestown, Salamanca, Allegany State Park, Westfield, Lakewood,
  Falconer, Mayville, Long Point State Park, Jamestown West and
  Chautauqua Institution.

 This includes the following highways...
 Interstate 90 between exits 61 and 60.
 Interstate 86 between exits 6 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and frequent 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 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4227 7976 4244 7950 4223 7872 4200 7882
      4200 7915 4216 7976
TIME...MOT...LOC 0744Z 292DEG 32KT 4229 7956 

HAIL...1.00IN
WIND...60MPH
 
$$

Welch

2 follow-up statements

176 
WWUS51 KBUF 250824
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
424 AM EDT Tue Aug 25 2020

NYC009-013-250845-
/O.CON.KBUF.SV.W.0088.000000T0000Z-200825T0845Z/
Cattaraugus NY-Chautauqua NY-
424 AM EDT Tue Aug 25 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM EDT
FOR SOUTHWESTERN CATTARAUGUS AND SOUTHEASTERN CHAUTAUQUA COUNTIES...

At 423 AM EDT, a severe thunderstorm was located over Jamestown West,
or over Jamestown, moving southeast at 35 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,
Jamestown West, Frewsburg, Busti, Gerry and Conewango.

 This includes Interstate 86 between exits 9 and 19.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Occasional 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.

&&

LAT...LON 4226 7927 4223 7872 4200 7882 4200 7915
      4208 7947
TIME...MOT...LOC 0823Z 295DEG 30KT 4209 7928 

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

Welch

889 
WWUS51 KBUF 250845
SVSBUF

Severe Weather Statement
National Weather Service Buffalo NY
445 AM EDT Tue Aug 25 2020

NYC009-013-250855-
/O.EXP.KBUF.SV.W.0088.000000T0000Z-200825T0845Z/
Cattaraugus NY-Chautauqua NY-
445 AM EDT Tue Aug 25 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CATTARAUGUS AND
SOUTHEASTERN CHAUTAUQUA COUNTIES HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.

LAT...LON 4226 7927 4223 7872 4200 7882 4200 7915
      4208 7947
TIME...MOT...LOC 0845Z 292DEG 32KT 4202 7906 

$$

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 1:28 AM EDT	Special Marine Warning	BUF		92 min
Aug 25, 1:52 AM EDT	Special Marine Warning	BUF		53 min
Aug 25, 1:59 AM EDT	Severe Thunderstorm Warning	BUF	Erie, Niagara	61 min
Aug 25, 2:27 AM EDT	Severe Thunderstorm Warning	BUF	Genesee, Monroe, Niagara, Orleans	63 min
Aug 25, 2:40 AM EDT	Special Weather Statement	BUF	Erie	50 min
Aug 25, 2:46 AM EDT	Special Marine Warning	BUF		59 min
Aug 25, 3:14 AM EDT	Special Weather Statement	BUF	Jefferson, Monroe, Ontario, Oswego, Wayne	91 min
Aug 25, 3:18 AM EDT	Special Weather Statement	BUF	Allegany, Cattaraugus, Chautauqua, Livingston, Wyoming	87 min
Aug 25, 4:25 AM EDT	Small Craft Advisory	BUF		24 hr
Aug 25, 4:26 AM EDT	Beach Hazards Statement	BUF	Cayuga, Jefferson, Monroe, Oswego, Wayne	24 hr
Aug 25, 11:54 AM EDT	Special Weather Statement	BUF	Ontario	51 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.