Alert archive / Massachusetts / Dense Fog Advisories in 2012

Dense Fog Advisory 7, NWS Boston/Norton, MA

May 29, 20128 counties in Massachusetts; 5 counties in Rhode Island

NWS Boston/Norton, MA issued this dense fog advisory at May 29, 2012, 6:30 AM EDT for 8 counties in Massachusetts; 5 counties in Rhode Island. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 29, 2012, 6:30 AM EDT (10:30 UTC)
Expired: May 29, 2012, 10:00 AM EDT
In force: 4 hr
Issued by: NWS Boston/Norton, MA

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 20 km from the middle of the area, began a volume at 10:30 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

Gray, ME (KGYX), launched 00:00Z, 10.5 hours before the alert went out and 241 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: 0 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 372 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 May 29, 4:27 AM EDT, 2 hours 3 minutes earlier.

Area forecast discussion, May 29, 4:27 AM EDT, 2 hours 3 minutes before

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Hazardous weather outlook, May 29, 4:27 AM EDT, 2 hours 3 minutes before

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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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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
May 29, 3:59 AM EDT	Small Craft Advisory for Hazardous Seas	BOX		36 hr
May 29, 5:59 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	61 min
May 29, 6:34 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	56 min
May 29, 6:39 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	66 min
May 29, 7:49 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	56 min
May 29, 7:57 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	63 min

Nearby

Dense Fog Advisories in Massachusetts, 2012 Dense Fog Advisories in Rhode Island, 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.