Alert archive / Massachusetts / Special Weather Statements in 2017

Special Weather Statement, NWS Boston/Norton, MA

July 13, 2017Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Jul 13, 2017, 4:21 PM EDT for Plymouth County, Massachusetts. It was in force for 39 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: Jul 13, 2017, 4:21 PM EDT (20:21 UTC)
Expired: Jul 13, 2017, 5:00 PM EDT
In force: 39 min
Issued by: NWS Boston/Norton, MA

County Plymouth County, MA

The radar

The Boston radar (KBOX), 30 km from the middle of the area, began a volume at 20:23 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

Chatham, MA (KCHH), launched 12:00Z, 8.4 hours before the alert went out and 72 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: 52 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

141 
WWUS81 KBOX 132021
SPSBOX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
421 PM EDT THU JUL 13 2017
 
MAZ018-019-021-132100-
Eastern Plymouth MA-Southern Plymouth MA-Western Plymouth MA-
421 PM EDT THU JUL 13 2017

...Thunderstorms Developing in southern Plymouth and northeastern 
Bristol Counties COUNTIES...

At 420 PM EDT, Doppler radar was tracking a strong thunderstorm over
Lakeville, or 8 miles south of Bridgewater, moving east at 30 mph.

Winds in excess of 30 mph will accompany this storm. Heavy rain and 
minor street flooding also a threat.

Locations impacted include...
Plymouth, Taunton, Bridgewater, Middleborough, Wareham, Kingston,
Carver, Lakeville, Halifax, Rochester and Plympton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.

Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.

&&

LAT...LON 4176 7091 4179 7092 4179 7099 4184 7101
      4186 7098 4194 7100 4201 7068 4202 7059
      4201 7058 4198 7063 4194 7052 4184 7052
TIME...MOT...LOC 2020Z 257DEG 25KT 4186 7092 

$$

md

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:16 PM EDT	Areal Flood Warning	BOX	Middlesex, Norfolk, Suffolk	3 hr
Jul 13, 11:06 AM EDT	Flash Flood Watch	BOX	Bristol, Hampden, Hampshire, Plymouth	8 hr
Jul 13, 2:34 PM EDT	Special Marine Warning	BOX		56 min
Jul 13, 3:13 PM EDT	Special Weather Statement	BOX	Hampden	47 min
Jul 13, 1:20 PM EDT	Special Weather Statement	BOX	Providence	25 min
Jul 13, 2:21 PM EDT	Special Weather Statement	BOX	Kent	24 min
Jul 13, 2:41 PM EDT	Flash Flood Warning	BOX	Washington	3 hr
Jul 13, 2:28 PM EDT	Special Weather Statement	BOX		47 min
Jul 13, 3:58 PM EDT	Special Weather Statement	BOX		47 min
Jul 13, 4:34 PM EDT	Special Weather Statement	BOX		41 min

Nearby

Special Weather Statements in Massachusetts, 2017 Every special weather statement in 2017

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.