Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

July 18, 2021Genesee County, New York

NWS Buffalo, NY issued this special weather statement at Jul 18, 2021, 7:18 PM EDT for Genesee County, New York. It was in force for 42 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 18, 2021, 7:18 PM EDT (23:18 UTC)
Expired
Jul 18, 2021, 8:00 PM EDT
In force
42 min
Issued by
NWS Buffalo, NY

County Genesee County, NY

The radar

The Buffalo radar (KBUF), 37 km from the middle of the area, began a volume at 23:22 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, 11.3 hours before the alert went out and 36 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 2021-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 2021-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.193958Sfc1 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
4 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
881 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

440 
WWUS81 KBUF 182318
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
718 PM EDT Sun Jul 18 2021

NYZ002-011-190000-
Orleans-Genesee-
718 PM EDT Sun Jul 18 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ORLEANS AND
NORTHWESTERN GENESEE COUNTIES...

At 718 PM EDT, a strong thunderstorm was located near Medina, moving
south at 20 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm, along with brief torrential downpours.

Locations impacted include...
Batavia, Medina, Pembroke, Oakfield, Shelby, Alabama, Corfu, East
Pembroke and Millville.

This includes Interstate 90 near exit 48A.
 
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4324 7839 4323 7822 4297 7819 4294 7833
      4299 7845
TIME...MOT...LOC 2318Z 007DEG 16KT 4316 7833 
$$

Hitchcock

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 6:21 PM EDTSpecial Weather StatementBUFOrleans39 min
Jul 18, 7:55 PM EDTSpecial Weather StatementBUFGenesee, Orleans35 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.