Alert archive / Massachusetts / Areal Flood Advisories in 2012

Areal Flood Advisory 87, NWS Boston/Norton, MA

October 29, 20125 counties in Massachusetts

NWS Boston/Norton, MA issued this areal flood advisory at Oct 29, 2012, 7:41 PM EDT for 5 counties in Massachusetts. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Oct 29, 2012, 7:41 PM EDT (23:41 UTC)
Expired: Oct 29, 2012, 10:30 PM EDT
In force: 3 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Barnstable County, MA, Bristol County, MA, Dukes County, MA, Nantucket County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 61 km from the middle of the area, began a volume at 23:44 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, 11.7 hours before the alert went out and 210 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: 516 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 682 m²/s²
0-3 km storm-relative helicity: 1006 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood advisory went out at Oct 29, 7:05 PM EDT, 36 minutes earlier.

Area forecast discussion, Oct 29, 7:05 PM EDT, 36 minutes before

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Hazardous weather outlook, Oct 29, 4:44 PM EDT, 2 hours 57 minutes before

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In the hours before

Local storm report, Oct 29, 6:03 PM EDT, 1 hour 38 minutes before

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Local storm report, Oct 29, 6:54 PM EDT, 47 minutes before

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Local storm report, Oct 29, 7:10 PM EDT, 31 minutes before

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Local storm report, Oct 29, 7:11 PM EDT, 30 minutes before

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Local storm report, Oct 29, 7:26 PM EDT, 15 minutes before

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Local storm report, Oct 29, 7:28 PM EDT, 13 minutes before

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Nearby

Areal Flood Advisories in Massachusetts, 2012 Every 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.