Alert archive / Massachusetts / Dense Fog Advisories in 2011
Dense Fog Advisory 4, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this dense fog advisory at Apr 28, 2011, 11:42 AM EDT for Dukes County, Nantucket County, Massachusetts; Newport County, Washington County, Rhode Island. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Apr 28, 2011, 11:42 AM EDT (15:42 UTC)
- Expired
- Apr 29, 2011, 12:00 AM EDT
- In force
- 12 hr
- Issued by
- NWS Boston/Norton, MA
Counties Dukes County, MA, Nantucket County, MA, Newport County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 66 km from the middle of the area, began a volume at 15:42 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 12:00Z, 3.7 hours before the alert went out and 174 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.
- Mixed-layer CAPE
- 211 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 513 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 346 m²/s²
- 0-3 km storm-relative helicity
- 324 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 27, 7:34 PM EDT, 16 hours 8 minutes earlier.
Area forecast discussion, Apr 27, 7:34 PM EDT, 16 hours 8 minutes before
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Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 4:38 AM EDT | Wind Advisory | BOX | Barnstable, Bristol, Dukes, Nantucket, Norfolk, Plymouth and 1 more | 13 hr |
| Apr 28, 9:10 AM EDT | Special Weather Statement | BOX | Franklin | 50 min |
| Apr 28, 4:46 PM EDT | Special Weather Statement | BOX | Bristol, Plymouth | 59 min |
| Apr 28, 4:58 PM EDT | Special Weather Statement | BOX | Norfolk | 47 min |
| Apr 28, 7:58 PM EDT | Areal Flood Advisory | BOX | Barnstable, Bristol, Plymouth | 3 hr |
| Apr 28, 12:34 PM EDT | River Flood Warning | BOX | Capitol Planning Region, Lower Connecticut River Valley Planning Region | 5 days |
| Apr 28, 12:34 PM EDT | River Flood Warning | BOX | Capitol Planning Region, Lower Connecticut River Valley Planning Region | 6 days |
Nearby
Dense Fog Advisories in Massachusetts, 2011Dense Fog Advisories in Rhode Island, 2011Every 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.