Alert archive / Massachusetts / Areal Flood Advisories in 2012

Areal Flood Advisory 52, NWS Boston/Norton, MA

August 12, 2012Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this areal flood advisory at Aug 12, 2012, 4:24 PM EDT for Middlesex County, Worcester County, Massachusetts. It was in force for 55 min.

The area

The counties it named.

The facts

Issued: Aug 12, 2012, 4:24 PM EDT (20:24 UTC)
Expired: Aug 12, 2012, 5:19 PM EDT
In force: 55 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 199 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: 220 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 529 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 93 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 Aug 12, 3:51 PM EDT, 33 minutes earlier.

Area forecast discussion, Aug 12, 3:51 PM EDT, 33 minutes before

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Hazardous weather outlook, Aug 12, 4:21 PM EDT, 3 minutes before

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In the hours before

Local storm report, Aug 12, 10:26 AM EDT, 5 hours 58 minutes before

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Local storm report, Aug 12, 11:35 AM EDT, 4 hours 49 minutes before

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Special weather statement, Aug 12, 2:53 PM EDT, 1 hour 31 minutes before

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Special weather statement, Aug 12, 3:26 PM EDT, 58 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 8:18 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	30 min
Aug 12, 7:32 AM EDT	Areal Flood Advisory	BOX	Hampden, Hampshire, Worcester	3 hr
Aug 12, 2:53 PM EDT	Special Weather Statement	BOX	Worcester	37 min
Aug 12, 3:26 PM EDT	Special Weather Statement	BOX	Worcester	64 min
Aug 12, 6:38 PM EDT	Special Weather Statement	BOX	Suffolk	22 min
Aug 12, 7:03 PM EDT	Areal Flood Advisory	BOX	Essex	39 min
Aug 12, 1:34 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	84 min

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.