Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

July 17, 2021Livingston County, New York

NWS Buffalo, NY issued this special weather statement at Jul 17, 2021, 4:30 PM EDT for Livingston County, New York. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2021, 4:30 PM EDT (20:30 UTC)
Expired: Jul 17, 2021, 5:15 PM EDT
In force: 45 min
Issued by: NWS Buffalo, NY

County Livingston County, NY

The radar

The Buffalo radar (KBUF), 82 km from the middle of the area, began a volume at 20:30 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.5 hours before the alert went out and 78 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: 558 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

874 
WWUS81 KBUF 172030
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
430 PM EDT Sat Jul 17 2021

NYZ012-013-021-172115-
Allegany-Livingston-Wyoming-
430 PM EDT Sat Jul 17 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN WYOMING...
SOUTHWESTERN LIVINGSTON AND NORTHEASTERN ALLEGANY COUNTIES...

At 429 PM EDT, a strong thunderstorm was located near Portageville, 
or 11 miles southwest of Letchworth State Park, moving northeast at 
15 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
Dansville, Letchworth State Park, Portageville, Groveland, Nunda,
Pike, Castile, Ossian, Canaseraga, Birdsall, Short Tract, Ossian
Center, Fillmore, Swain, Hunt, Rossburg, Sonyea and Dalton.

This includes Interstate 390 between exits 4 and 6.
 
Heavy rainfall is also occurring with this storm, and may cause 
localized flooding. Do not drive your vehicle through flooded 
roadways.

LAT...LON 4256 7819 4274 7781 4254 7768 4253 7772
      4244 7773 4235 7809
TIME...MOT...LOC 2028Z 244DEG 15KT 4250 7808 
$$

Welch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 4:15 AM EDT	Beach Hazards Statement	BUF	Chautauqua, Monroe, Niagara, Orleans, Wayne	32 hr
Jul 17, 4:42 AM EDT	Special Weather Statement	BUF	Chautauqua	48 min
Jul 17, 6:12 AM EDT	Areal Flood Warning	BUF	Erie, Genesee, Livingston, Monroe, Niagara, Orleans and 1 more	13 hr
Jul 17, 7:39 AM EDT	Special Weather Statement	BUF	Chautauqua	36 min
Jul 17, 7:59 AM EDT	Flash Flood Warning	BUF	Chautauqua	3 hr
Jul 17, 9:11 AM EDT	Areal Flood Warning	BUF	Chautauqua	3 hr
Jul 17, 1:48 PM EDT	Severe Thunderstorm Warning	BUF	Allegany	42 min
Jul 17, 2:10 PM EDT	Areal Flood Warning	BUF	Monroe	40 hr
Jul 17, 3:15 PM EDT	Flash Flood Warning	BUF	Cattaraugus, Erie	6 hr
Jul 17, 3:15 PM EDT	Tornado Warning	BUF	Cattaraugus, Erie	30 min
Jul 17, 3:46 PM EDT	Severe Thunderstorm Warning	BUF	Allegany, Cattaraugus, Erie, Wyoming	44 min
Jul 17, 4:35 PM EDT	River Flood Warning	BUF	Cattaraugus, Chautauqua, Erie, Wyoming	10 hr
Jul 17, 5:15 PM EDT	Areal Flood Warning	BUF	Livingston, Ontario	3 hr
Jul 17, 5:28 PM EDT	Areal Flood Warning	BUF	Allegany, Cattaraugus	5 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.