Alert archive / Massachusetts / Winter Storm Watches in 2020

Winter Storm Watch 1, NWS Boston/Norton, MA

January 17, 20206 counties in Massachusetts; Providence County, Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this winter storm watch at Jan 17, 2020, 3:35 AM EST for 6 counties in Massachusetts; Providence County, Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It took effect at Jan 18, 2020, 3:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 17, 2020, 3:35 AM EST (08:35 UTC)
In effect from: Jan 18, 2020, 3:00 PM EST
Expired: Jan 17, 2020, 3:58 PM EST
In force
Issued by: NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Providence County, RI

The radar

The Boston radar (KBOX), 79 km from the middle of the area, began a volume at 08:39 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 00:00Z, 8.6 hours before the alert went out and 157 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: 1439 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this winter storm watch went out at Jan 17, 12:51 AM EST, 2 hours 44 minutes earlier.

Area forecast discussion, Jan 17, 12:51 AM EST, 2 hours 44 minutes before

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Hazardous weather outlook, Jan 16, 4:35 PM EST, 11 hours before

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The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 17, 3:58 PM EST	Winter Storm Warning	BOX	Essex, Franklin, Hampden, Hampshire, Middlesex, Worcester	36 hr
Jan 17, 3:58 PM EST	Winter Weather Advisory	BOX	Barnstable, Bristol, Essex, Franklin, Hampden, Hampshire and 5 more	38 hr
Jan 17, 4:00 PM EST	Small Craft Advisory	BOX		15 hr

Nearby

Winter Storm Watches in Massachusetts, 2020 Winter Storm Watches in Connecticut, 2020 Winter Storm Watches in Rhode Island, 2020 Every winter storm watch in 2020

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.