Alert archive / Connecticut / Mesoscale Discussions in 2012

Mesoscale Discussion 1272

June 25, 2012Franklin County, Hampden County, Hampshire County, Massachusetts; Bergen County, New Jersey; Putnam County, Rockland County, Westchester County, New York

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2012, 3:12 PM EDT for Franklin County, Hampden County, Hampshire County, Massachusetts; Bergen County, New Jersey; Putnam County, Rockland County, Westchester County, New York. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2012, 3:12 PM EDT (19:12 UTC)
Expired: Jun 25, 2012, 4:15 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Bergen County, NJ, Putnam County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 88 km from the middle of the area, began a volume at 19:14 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

Brookhaven, NY (KOKX), launched 12:00Z, 7.2 hours before the alert went out and 88 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: 1055 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 785 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.1

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
Jun 25, 3:44 AM EDT	Mesoscale Discussion	SPC		2 hr
Jun 25, 6:21 AM EDT	Mesoscale Discussion	SPC		24 min
Jun 25, 6:39 AM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more	7 hr

Nearby

Mesoscale Discussions in Connecticut, 2012 Mesoscale Discussions in Massachusetts, 2012 Mesoscale Discussions in New York, 2012 Every 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.