Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 1967

September 18, 2012Berkshire County, Massachusetts; 17 counties in New York; Addison County, Bennington County, Rutland County, Vermont

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2012, 3:26 PM EDT for Berkshire County, Massachusetts; 17 counties in New York; Addison County, Bennington County, Rutland County, Vermont. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued
Sep 18, 2012, 3:26 PM EDT (19:26 UTC)
Expired
Sep 18, 2012, 4:00 PM EDT
In force
34 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 21 counties

Berkshire County, MA, Albany County, NY, Columbia County, NY, Dutchess County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Montgomery County, NY, Putnam County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Rutland County, VT

The radar

The Albany radar (KENX), 54 km from the middle of the area, began a volume at 19:27 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, 7.4 hours before the alert went out and 42 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 2012-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 2012-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 251 square meters per square second.1939587897Sfc1 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
2 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
572 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
251 m²/s²
0-3 km storm-relative helicity
226 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
Sep 18, 11:14 AM EDTMesoscale DiscussionSPC91 min
Sep 18, 3:38 PM EDTTornado WatchSPCGreater Bridgeport Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region8 hr
Sep 18, 4:21 PM EDTMesoscale DiscussionSPC114 min
Sep 18, 4:41 PM EDTMesoscale DiscussionSPC2 hr
Sep 18, 7:42 PM EDTMesoscale DiscussionSPC63 min
Sep 18, 7:54 PM EDTSevere Thunderstorm WatchSPCCapitol Planning Region, Northeastern Connecticut Planning Region6 hr
Sep 18, 11:19 AM EDTMesoscale DiscussionSPCAlbany, Broome, Chenango, Delaware, Fulton, Greene and 8 more86 min
Sep 18, 12:10 PM EDTTornado WatchSPCBronx, Kings, New York, Orange, Queens, Richmond and 2 more9 hr
Sep 18, 12:57 PM EDTMesoscale DiscussionSPCAlbany, Broome, Chemung, Chenango, Columbia, Cortland and 11 more93 min
Sep 18, 1:21 PM EDTTornado WatchSPCBroome, Chenango, Cortland, Delaware, Madison, Oneida and 4 more5 hr
Sep 18, 1:56 PM EDTMesoscale DiscussionSPCKings, New York, Orange, Richmond, Rockland64 min
Sep 18, 2:10 PM EDTMesoscale DiscussionSPCClinton, Essex, Franklin, Fulton, Hamilton, Herkimer and 6 more95 min
Sep 18, 6:08 PM EDTMesoscale DiscussionSPCBronx, Kings, New York, Queens, Richmond67 min

Nearby

Mesoscale Discussions in New York, 2012Mesoscale Discussions in Vermont, 2012Mesoscale Discussions in Connecticut, 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.