Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

July 20, 2021Cattaraugus County, New York

NWS Buffalo, NY issued this special weather statement at Jul 20, 2021, 11:10 PM EDT for Cattaraugus County, New York. It was in force for 35 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 20, 2021, 11:10 PM EDT (03:10 UTC)
Expired: Jul 20, 2021, 11:45 PM EDT
In force: 35 min
Issued by: NWS Buffalo, NY

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 89 km from the middle of the area, began a volume at 03:11 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 20, 11:30 PM EDT	TSTM WND DMG	6 Wsw Cattaraugus, NY	MULTIPLE REPORTS OF TREES DOWN IN LEON AREA.

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, 3.2 hours before the alert went out and 87 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1459 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -176 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

763 
WWUS81 KBUF 210310
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
1110 PM EDT Tue Jul 20 2021

NYZ019>021-085-210345-
Chautauqua-Cattaraugus-Allegany-Southern Erie-
1110 PM EDT Tue Jul 20 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CATTARAUGUS...
SOUTHWESTERN ERIE...SOUTHEASTERN CHAUTAUQUA AND WEST CENTRAL ALLEGANY
COUNTIES...

At 1109 PM EDT, radar indicated strong thunderstorms were located 
along a line extending from near Gowanda to near Long Point State 
Park. Movement was southeast at 30 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Jamestown, Olean, Salamanca, Allegany State Park, Lakewood, Gowanda,
Falconer, Ashford, Allegany, Franklinville, Cuba, Long Point State
Park, Jamestown West, Frewsburg, St. Bonaventure, Ashford Hollow,
Collins, Hinsdale, Great Valley and New Albion.

This includes Interstate 86 between exits 7 and 28.
 
If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4200 7921 4217 7950 4256 7902 4227 7822
      4200 7855
TIME...MOT...LOC 0308Z 302DEG 26KT 4247 7900 4219 7936 
$$

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:07 PM EDT	Areal Flood Warning	BUF	Livingston, Monroe, Ontario, Wayne	81 min
Jul 20, 8:28 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus	62 min
Jul 20, 8:39 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Livingston, Wyoming	53 min
Jul 20, 9:16 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	36 min
Jul 20, 9:45 PM EDT	Special Marine Warning	BUF		60 min
Jul 20, 10:14 PM EDT	Areal Flood Warning	BUF	Niagara	9 hr
Jul 20, 10:19 PM EDT	Severe Thunderstorm Warning	BUF	Chautauqua	56 min
Jul 20, 11:29 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Chautauqua	61 min
Jul 21, 12:31 AM EDT	Special Weather Statement	BUF	Allegany	44 min

Nearby

Special Weather Statements in New York, 2021 Every special weather statement 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.