Alert archive / New York / Mesoscale Discussions in 2004

Mesoscale Discussion 2141

August 29, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2004, 12:45 PM EDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 29, 2004, 12:45 PM EDT (16:45 UTC)
Expired: Aug 29, 2004, 3:15 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 58 counties

Berkshire County, MA, Franklin County, MA, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH, Albany County, NY, Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chenango County, NY, Clinton County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Genesee County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, St. Lawrence County, NY, Steuben County, NY, Tompkins County, NY, Warren County, NY, Washington County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Addison County, VT, Bennington County, VT, Chittenden County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 83 km from the middle of the area, began a volume at 16:47 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 795Aug 29, 1:20 PM EDT

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 4.8 hours before the alert went out and 93 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: 378 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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
Aug 29, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	Berkshire, Franklin, Hampden, Hampshire	6 hr
Aug 29, 3:46 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampden, Hampshire	119 min
Aug 29, 6:13 PM EDT	Mesoscale Discussion	SPC	Grafton	92 min

Nearby

Mesoscale Discussions in New York, 2004 Mesoscale Discussions in Vermont, 2004 Mesoscale Discussions in New Hampshire, 2004 Every mesoscale discussion in 2004

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.