Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

July 9, 2021Livingston County, New York

NWS Buffalo, NY issued this special weather statement at Jul 9, 2021, 11:39 AM EDT for Livingston County, New York. It was in force for 51 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 9, 2021, 11:39 AM EDT (15:39 UTC)
Expired
Jul 9, 2021, 12:30 PM EDT
In force
51 min
Issued by
NWS Buffalo, NY

County Livingston County, NY

The radar

The Buffalo radar (KBUF), 92 km from the middle of the area, began a volume at 15:39 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, 3.7 hours before the alert went out and 89 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-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2021-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 353 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2021-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
353 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
664 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

288 
WWUS81 KBUF 091539
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
1139 AM EDT Fri Jul 9 2021

NYZ013-014-091630-
Ontario-Livingston-
1139 AM EDT Fri Jul 9 2021

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL LIVINGSTON AND
NORTHWESTERN ONTARIO COUNTIES...

At 1138 AM EDT, a thunderstorm was located near Geneseo, moving east 
at 15 mph.

Winds in excess of 30 mph are possible with this storm, along with 
torrential downpours.

Locations impacted include...
Geneseo, Avon, Mount Morris, Honeoye Falls, Conesus, Lima, Honeoye,
Hemlock, West Bloomfield, Canadice, Livonia, and Lakeville.

This includes Interstate 390 between exits 7 and 10.
 
Torrential rainfall is occurring with this storm, and may cause 
localized flooding. Do not drive your vehicle through flooded 
roadways.

LAT...LON 4270 7787 4294 7779 4295 7762 4294 7748
      4295 7748 4295 7747 4280 7743 4265 7753
TIME...MOT...LOC 1538Z 280DEG 14KT 4282 7770 
$$

Hitchcock

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 12:32 PM EDTSpecial Weather StatementBUFOntario43 min

Nearby

Special Weather Statements in New York, 2021Every 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.