Alert archive / Massachusetts / Areal Flood Warnings in 2018

Areal Flood Warning 43, NWS Boston/Norton, MA

October 12, 2018Barnstable County, Dukes County, Nantucket County, Massachusetts

NWS Boston/Norton, MA issued this areal flood warning at Oct 12, 2018, 10:38 AM EDT for Barnstable County, Dukes County, Nantucket County, Massachusetts. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 12, 2018, 10:38 AM EDT (14:38 UTC)
Expired: Oct 12, 2018, 12:45 PM EDT
In force: 2 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Barnstable County, MA, Dukes County, MA, Nantucket County, MA

The radar

The Boston radar (KBOX), 88 km from the middle of the area, began a volume at 14:40 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, 2.6 hours before the alert went out and 222 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: 811 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -166 m²/s²
0-3 km storm-relative helicity: -68 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 warning 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 warning went out at Oct 12, 10:25 AM EDT, 13 minutes earlier.

Area forecast discussion, Oct 12, 10:25 AM EDT, 13 minutes before

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Hazardous weather outlook, Oct 12, 4:12 AM EDT, 6 hours 26 minutes before

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In the hours before

Special weather statement, Oct 12, 5:48 AM EDT, 4 hours 50 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
Oct 11, 10:56 PM EDT	Special Marine Warning	BOX		64 min
Oct 12, 5:06 AM EDT	Areal Flood Advisory	BOX	Barnstable, Bristol, Dukes, Nantucket, Plymouth	3 hr
Oct 12, 5:10 AM EDT	Areal Flood Advisory	BOX	Barnstable	3 hr
Oct 12, 6:54 AM EDT	Areal Flood Warning	BOX	Barnstable, Bristol, Dukes, Plymouth	4 hr

Nearby

Areal Flood Warnings in Massachusetts, 2018 Every areal flood warning in 2018

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.