Alert archive / Massachusetts / Areal Flood Advisories in 2012

Areal Flood Advisory 93, NWS Boston/Norton, MA

December 21, 2012Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this areal flood advisory at Dec 21, 2012, 4:02 PM EST for Hampshire County, Massachusetts. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Dec 21, 2012, 4:02 PM EST (21:02 UTC)
Expired
Dec 21, 2012, 7:00 PM EST
In force
3 hr
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Hampshire County, MA

The radar

The Albany radar (KENX), 118 km from the middle of the area, began a volume at 21:06 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

Albany, NY (KALY), launched 12:00Z, 9.0 hours before the alert went out and 103 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, Albany, NY at 12:00Z on 2012-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Albany, NY at 12:00Z on 2012-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 805 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
491 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
805 m²/s²
0-3 km storm-relative helicity
1143 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 20, 9:56 PM ESTStorm WarningBOX18 hr
Dec 21, 4:30 AM ESTHigh Wind WarningBOXBarnstable, Dukes, Nantucket11 hr
Dec 21, 4:30 AM ESTWind AdvisoryBOXBristol, Essex, Hampden, Middlesex, Norfolk, Plymouth and 2 more11 hr
Dec 21, 11:49 AM ESTAreal Flood AdvisoryBOXHampden, Worcester3 hr
Dec 21, 4:00 PM ESTGale WatchBOX12 hr
Dec 21, 4:00 PM ESTSmall Craft AdvisoryBOX12 hr

Nearby

Areal Flood Advisories in Massachusetts, 2012Every areal flood 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.