Alert archive / Massachusetts / Winter Storm Watches in 2018

Winter Storm Watch 4, NWS Boston/Norton, MA

February 16, 20187 counties in Massachusetts; 5 counties in Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this winter storm watch at Feb 16, 2018, 3:30 AM EST for 7 counties in Massachusetts; 5 counties in Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It took effect at Feb 17, 2018, 7:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 16, 2018, 3:30 AM EST (08:30 UTC)
In effect from: Feb 17, 2018, 7:00 PM EST
Expired: Feb 17, 2018, 1:26 PM EST
In force
Issued by: NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Barnstable County, MA, Bristol County, MA, Hampden County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 30 km from the middle of the area, began a volume at 08:32 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, 8.5 hours before the alert went out and 161 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: 1118 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 213 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 Feb 16, 12:46 AM EST, 2 hours 44 minutes earlier.

Area forecast discussion, Feb 16, 12:46 AM EST, 2 hours 44 minutes before

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Hazardous weather outlook, Feb 15, 4:31 PM EST, 10 hours 59 minutes before

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In the hours before

Special weather statement, Feb 16, 12:04 AM EST, 3 hours 26 minutes before

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Nearby

Winter Storm Watches in Massachusetts, 2018 Winter Storm Watches in Rhode Island, 2018 Winter Storm Watches in Connecticut, 2018 Every winter storm watch in 2018

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.