Alert archive / New York / Mesoscale Discussions in 2013

Mesoscale Discussion 538

April 19, 201321 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2013, 4:45 PM EDT for 21 counties in New York. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2013, 4:45 PM EDT (20:45 UTC)
Expired: Apr 19, 2013, 5:45 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 21 counties

Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Oswego County, NY, Otsego County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY

The radar

The Binghamton radar (KBGM), 63 km from the middle of the area, began a volume at 20:45 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

Albany, NY (KALY), launched 12:00Z, 8.8 hours before the alert went out and 155 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: 567 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 3:55 PM EDT	Tornado Watch	SPC	Sullivan	6 hr
Apr 19, 6:02 PM EDT	Mesoscale Discussion	SPC	Broome	58 min
Apr 19, 7:12 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, New York, Orange, Putnam, Queens and 3 more	93 min

Nearby

Mesoscale Discussions in New York, 2013 Every mesoscale discussion in 2013

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.