Alert archive / Rhode Island / Mesoscale Discussions in 2012

Mesoscale Discussion 1734

August 10, 20124 counties in Massachusetts; Suffolk County, New York; 5 counties in Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2012, 2:03 PM EDT for 4 counties in Massachusetts; Suffolk County, New York; 5 counties in Rhode Island. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 10, 2012, 2:03 PM EDT (18:03 UTC)
Expired: Aug 10, 2012, 3:30 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Barnstable County, MA, Bristol County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, NY, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 59 km from the middle of the area, began a volume at 18:05 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.

Tornado Watch 571Aug 10, 3:30 PM EDT

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 132 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: 1737 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

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.

Issued	Product	Office	Counties	Lasted
Aug 10, 8:21 AM EDT	Mesoscale Discussion	SPC		2 hr
Aug 10, 3:31 PM EDT	Tornado Watch	SPC	Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region	5 hr
Aug 10, 12:49 PM EDT	Mesoscale Discussion	SPC	Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Niagara and 2 more	86 min

Nearby

Mesoscale Discussions in Rhode Island, 2012 Mesoscale Discussions in Massachusetts, 2012 Mesoscale Discussions in Connecticut, 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.