Alert archive / Massachusetts / Freezing Rain Advisories in 2013

Freezing Rain Advisory 7, NWS Boston/Norton, MA

December 22, 2013Essex County, Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this freezing rain advisory at Dec 22, 2013, 4:40 PM EST for Essex County, Middlesex County, Worcester County, Massachusetts. It took effect at Dec 22, 2013, 7:00 PM EST. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued
Dec 22, 2013, 4:40 PM EST (21:40 UTC)
In effect from
Dec 22, 2013, 7:00 PM EST
Expired
Dec 23, 2013, 3:00 PM EST
In force
20 hr
Issued by
NWS Boston/Norton, MA

Counties Essex County, MA, Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 63 km from the middle of the area, began a volume at 21:39 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 12:00Z, 9.7 hours before the alert went out and 180 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, Gray, ME at 12:00Z on 2013-12-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLEL10008507005003002001001 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, Gray, ME at 12:00Z on 2013-12-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 781 square meters per square second.1939587897117Sfc1 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
4 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
409 m above ground
0-6 km bulk shear
97 kt
0-1 km storm-relative helicity
781 m²/s²
0-3 km storm-relative helicity
1106 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
Dec 22, 4:27 AM ESTFreezing Rain AdvisoryBOXEssex, Middlesex, Norfolk, Suffolk, Worcester35 hr
Dec 22, 4:28 PM ESTSmall Craft Advisory for Hazardous SeasBOX11 hr

Nearby

Freezing Rain Advisories in Massachusetts, 2013Every freezing rain 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.