Alert archive / New York / Mesoscale Discussions in 2013

Mesoscale Discussion 1817

August 31, 201311 counties in New York; 8 counties in Pennsylvania; Bennington County, Vermont

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2013, 4:02 PM EDT for 11 counties in New York; 8 counties in Pennsylvania; Bennington County, Vermont. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Aug 31, 2013, 4:02 PM EDT (20:02 UTC)
Expired: Aug 31, 2013, 5:00 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Albany County, NY, Broome County, NY, Columbia County, NY, Delaware County, NY, Greene County, NY, Rensselaer County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Tioga County, NY, Ulster County, NY, Bradford County, PA, Lackawanna County, PA, Lycoming County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Wayne County, PA, Wyoming County, PA, Bennington County, VT

The radar

The Binghamton radar (KBGM), 52 km from the middle of the area, began a volume at 20:05 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, 8.0 hours before the alert went out and 140 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: 1006 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 684 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 157 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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Nearby

Mesoscale Discussions in New York, 2013 Mesoscale Discussions in Pennsylvania, 2013 Mesoscale Discussions in Vermont, 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.