Alert archive / Massachusetts / Special Weather Statements in 2020

Special Weather Statement, NWS Boston/Norton, MA

August 18, 2020Nantucket County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Aug 18, 2020, 5:52 AM EDT for Nantucket County, Massachusetts. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 18, 2020, 5:52 AM EDT (09:52 UTC)
Expired: Aug 18, 2020, 6:45 AM EDT
In force: 53 min
Issued by: NWS Boston/Norton, MA

County Nantucket County, MA

The radar

The Boston radar (KBOX), 112 km from the middle of the area, began a volume at 09:52 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 00:00Z, 9.9 hours before the alert went out and 236 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: 116 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 18, 4:00 AM EDT, 1 hour 52 minutes earlier.

Area forecast discussion, Aug 18, 4:00 AM EDT, 1 hour 52 minutes before

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Hazardous weather outlook, Aug 18, 4:24 AM EDT, 1 hour 28 minutes before

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In the hours before

Special weather statement, Aug 18, 12:10 AM EDT, 5 hours 42 minutes before

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Special weather statement, Aug 18, 4:09 AM EDT, 1 hour 43 minutes before

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Special weather statement, Aug 18, 5:52 AM EDT, 0 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 17, 8:20 PM EDT	Special Weather Statement	BOX	Franklin	40 min
Aug 17, 8:56 PM EDT	Special Weather Statement	BOX	Hampden	49 min
Aug 17, 9:27 PM EDT	Special Weather Statement	BOX	Hampden	48 min
Aug 17, 10:10 PM EDT	Special Weather Statement	BOX	Worcester	50 min
Aug 18, 4:26 AM EDT	Special Marine Warning	BOX		49 min
Aug 18, 5:42 AM EDT	Special Marine Warning	BOX		63 min
Aug 18, 6:36 AM EDT	Special Marine Warning	BOX		54 min
Aug 18, 6:42 AM EDT	Special Weather Statement	BOX	Nantucket	33 min
Aug 18, 4:09 AM EDT	Special Weather Statement	BOX	Washington	51 min
Aug 17, 9:38 PM EDT	Special Weather Statement	BOX		52 min
Aug 18, 12:10 AM EDT	Special Weather Statement	BOX		50 min

Nearby

Special Weather Statements in Massachusetts, 2020 Every special weather statement in 2020

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.