Alert archive / Massachusetts / Mesoscale Discussions in 2015

Mesoscale Discussion 44

January 26, 201512 counties in Massachusetts; 5 counties in New York; 5 counties in Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Jan 26, 2015, 11:32 PM EST for 12 counties in Massachusetts; 5 counties in New York; 5 counties in Rhode Island. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 26, 2015, 11:32 PM EST (04:32 UTC)
Expired: Jan 27, 2015, 4:00 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 22 counties

Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bronx County, NY, Nassau County, NY, Putnam County, NY, Suffolk County, NY, Westchester County, NY, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Brookhaven radar (KOKX), 92 km from the middle of the area, began a volume at 04:35 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 00:00Z, 4.5 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 458 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 376 m²/s²
0-3 km storm-relative helicity: 457 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.

Issued	Product	Office	Counties	Lasted
Jan 27, 4:28 AM EST	Mesoscale Discussion	SPC		5 hr
Jan 27, 10:24 AM EST	Mesoscale Discussion	SPC	Bristol, Dukes, Essex, Middlesex, Norfolk, Plymouth and 1 more	5 hr

Nearby

Mesoscale Discussions in Massachusetts, 2015 Mesoscale Discussions in Connecticut, 2015 Mesoscale Discussions in New York, 2015 Every mesoscale discussion in 2015

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.