Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 958

May 29, 2012Berkshire County, Massachusetts; 14 counties in New York; 14 counties in Vermont

The Storm Prediction Center issued this mesoscale discussion at May 29, 2012, 1:52 PM EDT for Berkshire County, Massachusetts; 14 counties in New York; 14 counties in Vermont. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 29, 2012, 1:52 PM EDT (17:52 UTC)
Expired
May 29, 2012, 2:45 PM EDT
In force
53 min
Issued by
the Storm Prediction Center
All 29 counties

Berkshire County, MA, Albany County, NY, Clinton County, NY, Columbia County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Montgomery County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 111 km from the middle of the area, began a volume at 17:54 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.9 hours before the alert went out and 92 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 12:00Z on 2012-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1908 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, Albany, NY at 12:00Z on 2012-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.193958Sfc1 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
1908 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
1026 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

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
May 29, 12:01 PM EDTMesoscale DiscussionSPCBerkshire59 min
May 29, 12:26 PM EDTTornado WatchSPCBerkshire8 hr
May 29, 3:26 PM EDTMesoscale DiscussionSPCBerkshire64 min
May 29, 3:44 PM EDTSevere Thunderstorm WatchSPCFranklin, Hampden, Hampshire, Worcester5 hr
May 29, 7:01 PM EDTMesoscale DiscussionSPCHampden, Hampshire, Worcester89 min
May 29, 10:27 AM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Jefferson, Lewis and 11 more5 hr
May 29, 11:43 AM EDTMesoscale DiscussionSPCAlbany, Broome, Cayuga, Chemung, Chenango, Columbia and 26 more62 min
May 29, 1:03 PM EDTSevere Thunderstorm WatchSPCBroome, Chemung, Chenango, Cortland, Delaware, Madison and 5 more8 hr
May 29, 1:25 PM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 13 more65 min
May 29, 2:13 PM EDTMesoscale DiscussionSPCBroome, Chemung, Chenango, Cortland, Delaware, Dutchess and 10 more62 min
May 29, 3:12 PM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Cortland, Delaware and 12 more63 min
May 29, 4:40 PM EDTMesoscale DiscussionSPCBroome, Delaware, Otsego, Sullivan65 min
May 29, 5:54 PM EDTSevere Thunderstorm WatchSPCBronx, Kings, New York, Orange, Putnam, Queens and 3 more3 hr
May 29, 7:21 PM EDTMesoscale DiscussionSPCDutchess54 min

Nearby

Mesoscale Discussions in New York, 2012Mesoscale Discussions in Vermont, 2012Mesoscale Discussions in Massachusetts, 2012Every mesoscale discussion in 2012

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.