Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

June 30, 2021Livingston County, New York

NWS Buffalo, NY issued this special weather statement at Jun 30, 2021, 1:37 PM EDT for Livingston County, New York. It was in force for 53 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: Jun 30, 2021, 1:37 PM EDT (17:37 UTC)
Expired: Jun 30, 2021, 2:30 PM EDT
In force: 53 min
Issued by: NWS Buffalo, NY

County Livingston County, NY

The radar

The Buffalo radar (KBUF), 104 km from the middle of the area, began a volume at 17:41 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, 5.6 hours before the alert went out and 100 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: 366 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

414 
WWUS81 KBUF 301737
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
137 PM EDT Wed Jun 30 2021

NYZ012>014-301830-
Ontario-Livingston-Wyoming-
137 PM EDT Wed Jun 30 2021

...A STRONG THUNDERSTORM WILL AFFECT EASTERN WYOMING...CENTRAL
LIVINGSTON AND SOUTHWESTERN ONTARIO COUNTIES...

At 136 PM EDT, a strong thunderstorm was located over Perry, or near
Letchworth State Park, moving east at 45 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Geneseo, Letchworth State Park, Perry, Warsaw, Mount Morris, Conesus,
Naples, Rushville, Hemlock, Honeoye, Groveland, Springwater,
Canadice, Livonia, Castile, Silver Springs, Leicester, Wyoming,
Gainesville and Sonyea.

This includes Interstate 390 between exits 6 and 7.
 
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4258 7761 4260 7816 4282 7814 4283 7718
      4276 7718 4276 7732 4271 7735 4267 7736
      4267 7737 4258 7737
TIME...MOT...LOC 1736Z 271DEG 39KT 4273 7804 
$$

Mitchell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 9:51 PM EDT	Special Weather Statement	BUF	Cattaraugus	39 min
Jun 29, 10:33 PM EDT	Special Weather Statement	BUF	Cattaraugus	42 min
Jun 30, 11:30 AM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Oswego	45 min
Jun 30, 12:15 PM EDT	Special Weather Statement	BUF	Onondaga	15 min
Jun 30, 2:15 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario	35 min
Jun 30, 2:47 PM EDT	Special Weather Statement	BUF	Allegany	43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.