Alert archive / Massachusetts / Areal Flood Advisories in 2012

Areal Flood Advisory 76, NWS Boston/Norton, MA

September 5, 2012Barnstable County, Massachusetts

NWS Boston/Norton, MA issued this areal flood advisory at Sep 5, 2012, 3:53 PM EDT for Barnstable County, Massachusetts. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 5, 2012, 3:53 PM EDT (19:53 UTC)
Expired
Sep 5, 2012, 7:00 PM EDT
In force
3 hr
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Barnstable County, MA

The radar

The Boston radar (KBOX), 78 km from the middle of the area, began a volume at 19:53 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, 7.9 hours before the alert went out and 235 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, Brookhaven, NY at 12:00Z on 2012-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2034 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, Brookhaven, NY at 12:00Z on 2012-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 204 square meters per square second.193958Sfc1 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
2034 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
455 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
204 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 4:25 AM EDTAreal Flood AdvisoryBOXFranklin, Hampden, Hampshire, Worcester4 hr
Sep 5, 8:13 AM EDTAreal Flood AdvisoryBOXFranklin, Hampden, Hampshire, Worcester3 hr
Sep 5, 11:47 AM EDTAreal Flood AdvisoryBOXBristol, Plymouth3 hr
Sep 5, 12:07 PM EDTFlash Flood Warning EmergencyBOXBarnstable, Bristol, Plymouth4 hr
Sep 5, 10:48 AM EDTAreal Flood AdvisoryBOXKent, Washington3 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.