Alert archive / Massachusetts / Dense Fog Advisories in 2013

Dense Fog Advisory 13, NWS Boston/Norton, MA

July 13, 20136 counties in Massachusetts; Newport County, Washington County, Rhode Island

NWS Boston/Norton, MA issued this dense fog advisory at Jul 13, 2013, 11:19 PM EDT for 6 counties in Massachusetts; Newport County, Washington County, Rhode Island. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Jul 13, 2013, 11:19 PM EDT (03:19 UTC)
Expired
Jul 14, 2013, 9:00 AM EDT
In force
10 hr
Issued by
NWS Boston/Norton, MA

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Newport County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 41 km from the middle of the area, began a volume at 03:20 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, 3.3 hours before the alert went out and 188 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2013-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 907 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2013-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
907 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
581 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 4:02 PM EDTHeat AdvisoryBOXBristol, Essex, Hampden, Hampshire, Middlesex, Norfolk and 1 more27 hr
Jul 14, 7:26 PM EDTAreal Flood AdvisoryBOXBristol, Plymouth3 hr
Jul 14, 7:51 PM EDTAreal Flood AdvisoryBOXBarnstable, Bristol, Plymouth54 min

Nearby

Dense Fog Advisories in Massachusetts, 2013Dense Fog Advisories in Rhode Island, 2013Every dense fog advisory in 2013

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.