Alert archive / Massachusetts / Mesoscale Discussions in 2022

Mesoscale Discussion 99

January 29, 20228 counties in Massachusetts; Suffolk County, New York; 5 counties in Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2022, 10:57 AM EST for 8 counties in Massachusetts; Suffolk County, New York; 5 counties in Rhode Island. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jan 29, 2022, 10:57 AM EST (15:57 UTC)
Expired: Jan 29, 2022, 4:00 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center
Concerning: Heavy snow

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk 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), 45 km from the middle of the area, began a volume at 15:58 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

Albany, NY (KALY), launched 12:00Z, 4.0 hours before the alert went out and 231 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: 640 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 29, 4:25 AM EST	Mesoscale Discussion	SPC		6 hr
Jan 29, 5:48 PM EST	Mesoscale Discussion	SPC		6 hr
Jan 29, 12:01 AM EST	Mesoscale Discussion	SPC	Dukes, Nantucket	4 hr

Nearby

Mesoscale Discussions in Massachusetts, 2022 Mesoscale Discussions in Rhode Island, 2022 Mesoscale Discussions in Connecticut, 2022 Every mesoscale discussion in 2022

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.