Alert archive / Massachusetts / Dense Fog Advisories in 2011

Dense Fog Advisory 13, NWS Boston/Norton, MA

September 27, 20116 counties in Massachusetts; 5 counties in Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this dense fog advisory at Sep 27, 2011, 3:12 AM EDT for 6 counties in Massachusetts; 5 counties in Rhode Island; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Sep 27, 2011, 3:12 AM EDT (07:12 UTC)
Expired: Sep 27, 2011, 10:00 AM EDT
In force: 7 hr
Issued by: NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Barnstable County, MA, Bristol County, MA, Dukes County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth 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 07:15 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, 7.2 hours before the alert went out and 165 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: 98 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 63 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 Sep 27, 1:53 AM EDT, 1 hour 19 minutes earlier.

Area forecast discussion, Sep 27, 1:53 AM EDT, 1 hour 19 minutes before

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In the hours before

Special weather statement, Sep 26, 11:17 PM EDT, 3 hours 55 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
Sep 26, 8:21 PM EDT	Small Craft Advisory for Hazardous Seas	BOX		5 hr
Sep 27, 7:37 PM EDT	Areal Flood Advisory	BOX	Hampshire	61 min
Sep 27, 7:59 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire	2 hr

Nearby

Dense Fog Advisories in Massachusetts, 2011 Dense Fog Advisories in Rhode Island, 2011 Dense Fog Advisories in Connecticut, 2011 Every dense fog advisory in 2011

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.