Alert archive / New York / Mesoscale Discussions in 2009

Mesoscale Discussion 2239

December 9, 2009Jefferson County, Lewis County, St. Lawrence County, New York

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2009, 11:58 PM EST for Jefferson County, Lewis County, St. Lawrence County, New York. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Dec 9, 2009, 11:58 PM EST (04:58 UTC)
Expired
Dec 10, 2009, 4:00 AM EST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Jefferson County, NY, Lewis County, NY, St. Lawrence County, NY

The radar

The Ft Drum radar (KTYX), 37 km from the middle of the area, began a volume at 04:58 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 00:00Z, 5.0 hours before the alert went out and 207 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, Albany, NY at 00:00Z on 2009-12-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Albany, NY at 00:00Z on 2009-12-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 493 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
520 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
493 m²/s²
0-3 km storm-relative helicity
485 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.

IssuedProductOfficeCountiesLasted
Dec 9, 7:27 PM ESTMesoscale DiscussionSPCErie, Genesee, Livingston, Wyoming4 hr
Dec 9, 11:43 PM ESTMesoscale DiscussionSPCErie, Genesee, Livingston, Wyoming4 hr
Dec 10, 10:16 AM ESTMesoscale DiscussionSPCLewis, Oswego6 hr
Dec 10, 10:34 AM ESTMesoscale DiscussionSPCChautauqua, Erie, Livingston, Ontario, Wyoming6 hr

Nearby

Mesoscale Discussions in New York, 2009Every mesoscale discussion in 2009

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.