Alert archive / Massachusetts / Dense Fog Advisories in 2012

Dense Fog Advisory 1, NWS Boston/Norton, MA

December 31, 20115 counties in Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this dense fog advisory at Dec 31, 2011, 8:20 PM EST for 5 counties in Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It took effect at Dec 31, 2011, 9:00 PM EST. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Dec 31, 2011, 8:20 PM EST (01:20 UTC)
In effect from: Dec 31, 2011, 9:00 PM EST
Expired: Jan 1, 2012, 3:15 AM EST
In force: 6 hr
Issued by: NWS Boston/Norton, MA

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

The radar

The Boston radar (KBOX), 96 km from the middle of the area, began a volume at 01:24 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, 1.3 hours before the alert went out and 140 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: 724 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 88 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 dense fog advisory 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 dense fog advisory went out at Dec 31, 5:05 PM EST, 3 hours 15 minutes earlier.

Area forecast discussion, Dec 31, 5:05 PM EST, 3 hours 15 minutes before

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Hazardous weather outlook, Dec 31, 4:35 PM EST, 3 hours 45 minutes 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 1, 3:18 AM EST	Gale Warning	BOX		37 hr
Jan 1, 3:18 AM EST	Small Craft Advisory	BOX		6 days
Jan 1, 4:48 PM EST	Wind Advisory	BOX	Barnstable, Dukes, Nantucket	18 hr

Nearby

Dense Fog Advisories in Massachusetts, 2012 Dense Fog Advisories in Connecticut, 2012 Every dense fog advisory 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.