Alert archive / New York / Special Weather Statements in 2021

Special Weather Statement, NWS Buffalo, NY

April 28, 2021Cattaraugus County, New York

NWS Buffalo, NY issued this special weather statement at Apr 28, 2021, 8:42 PM EDT for Cattaraugus County, New York. It was in force for 33 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
Apr 28, 2021, 8:42 PM EDT (00:42 UTC)
Expired
Apr 28, 2021, 9:15 PM EDT
In force
33 min
Issued by
NWS Buffalo, NY

County Cattaraugus County, NY

The radar

The Buffalo radar (KBUF), 96 km from the middle of the area, began a volume at 00:44 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 00:00Z, 0.7 hours before the alert went out and 95 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 00:00Z on 2021-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 91 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 00:00Z on 2021-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.1939587897117136Sfc1 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
91 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
965 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted.

399 
WWUS81 KBUF 290042
SPSBUF

Special Weather Statement
National Weather Service Buffalo NY
842 PM EDT Wed Apr 28 2021

NYZ019-020-290115-
Chautauqua-Cattaraugus-
842 PM EDT Wed Apr 28 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN CATTARAUGUS AND
EASTERN CHAUTAUQUA COUNTIES...

At 842 PM EDT, a strong thunderstorm was located near Falconer, or 7
miles northeast of Jamestown, moving east at 35 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Salamanca, Allegany State Park, Randolph, Napoli, East Randolph,
Steamburg and Kennedy.

This includes Interstate 86 between exits 14 and 20.
 
If outdoors, consider seeking shelter inside a building.

LAT...LON 4208 7915 4218 7915 4222 7880 4211 7867
      4200 7871 4200 7882
TIME...MOT...LOC 0042Z 274DEG 29KT 4214 7910 
$$

Thomas

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 2:24 PM EDTSmall Craft AdvisoryBUF44 hr
Apr 29, 2:24 PM EDTWind AdvisoryBUFAllegany, Cayuga, Genesee, Livingston, Monroe, Niagara and 5 more31 hr

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.