Alert archive / Massachusetts / Areal Flood Warnings in 2018

Areal Flood Warning 4, NWS Boston/Norton, MA

January 12, 2018Middlesex County, Worcester County, Massachusetts; Northeastern Connecticut Planning Region, Connecticut

NWS Boston/Norton, MA issued this areal flood warning at Jan 12, 2018, 5:50 PM EST for Middlesex County, Worcester County, Massachusetts; Northeastern Connecticut Planning Region, Connecticut. It was in force for 6 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: Jan 12, 2018, 5:50 PM EST (22:50 UTC)
Expired: Jan 12, 2018, 11:45 PM EST
In force: 6 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Northeastern Connecticut Planning Region, CT, Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 59 km from the middle of the area, began a volume at 22:49 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, 10.8 hours before the alert went out and 177 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: 619 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 228 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 Jan 12, 4:18 PM EST, 1 hour 32 minutes earlier.

Area forecast discussion, Jan 12, 4:18 PM EST, 1 hour 32 minutes before

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Hazardous weather outlook, Jan 12, 4:12 PM EST, 1 hour 38 minutes before

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In the hours before

Local storm report, Jan 12, 4:09 PM EST, 1 hour 41 minutes before

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Local storm report, Jan 12, 4:33 PM EST, 1 hour 17 minutes before

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Local storm report, Jan 12, 5:30 PM EST, 20 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
Jan 11, 10:40 PM EST	Dense Fog Advisory	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	10 hr
Jan 12, 2:44 AM EST	Gale Warning	BOX		30 hr
Jan 12, 2:58 AM EST	Wind Advisory	BOX	Barnstable, Bristol, Dukes, Nantucket, Norfolk, Plymouth and 1 more	30 hr
Jan 12, 3:35 AM EST	Winter Weather Advisory	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more	33 hr
Jan 12, 12:43 PM EST	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	4 hr
Jan 12, 1:36 PM EST	Areal Flood Warning	BOX	Franklin, Hampden, Hampshire, Worcester	6 hr
Jan 12, 2:26 PM EST	Areal Flood Warning	BOX	Hampden, Hampshire, Middlesex, Worcester	6 hr
Jan 12, 4:22 PM EST	Dense Fog Advisory	BOX	Barnstable, Bristol, Dukes, Nantucket, Plymouth	13 hr
Jan 12, 5:33 PM EST	Areal Flood Warning	BOX	Franklin, Hampden, Hampshire	6 hr

Nearby

Areal Flood Warnings in Massachusetts, 2018 Areal Flood Warnings in Connecticut, 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.