Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

July 3, 2021Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Jul 3, 2021, 4:52 PM EDT for Suffolk County, Massachusetts. It was in force for 83 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 3, 2021, 4:52 PM EDT (20:52 UTC)
Expired
Jul 3, 2021, 6:15 PM EDT
In force
83 min
Issued by
NWS Boston/Norton, MA

County Suffolk County, MA

The radar

The Boston radar (KBOX), 46 km from the middle of the area, began a volume at 20:54 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

Gray, ME (KGYX), launched 12:00Z, 8.9 hours before the alert went out and 181 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, Gray, ME at 12:00Z on 2021-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Gray, ME at 12:00Z on 2021-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939587897117136Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
475 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

689 
WWUS81 KBOX 032052
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
452 PM EDT Sat Jul 3 2021
 
MAZ005>007-013>016-018-019-032215-
Eastern Essex MA-Eastern Plymouth MA-Suffolk MA-Western Norfolk MA-
Central Middlesex County MA-Western Plymouth MA-Eastern Norfolk MA-
Western Essex MA-Southeast Middlesex MA-
452 PM EDT Sat Jul 3 2021

...SHOWERS AND ISOLATED THUNDERSTORMS WERE MOVING THROUGH THE BOSTON 
AREA...

At 450 PM EDT, Doppler radar was tracking showers and isolated 
thunderstorms near Milton and Boston Massachusetts, moving north at 
25 mph. Rain from these showers may cause minor flooding of some 
poor drainage areas.

Locations impacted include...
Boston, Lowell, Cambridge, Quincy, Lynn, Newton, Lawrence,
Somerville, Waltham, Malden, Brookline, Medford, Weymouth, Revere,
Peabody, Methuen, Arlington, Everett, Salem and Billerica.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4242 7092 4242 7093 4246 7094 4241 7099
      4233 7093 4238 7105 4232 7100 4230 7105
      4231 7097 4230 7100 4229 7102 4226 7097
      4232 7093 4225 7096 4227 7093 4213 7091
      4211 7115 4270 7129 4273 7093
TIME...MOT...LOC 2050Z 174DEG 17KT 4235 7108 

$$

WTB

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 3:38 PM EDTSpecial Weather StatementBOXBristol, Plymouth52 min

Nearby

Special Weather Statements in Massachusetts, 2021Every special weather statement in 2021

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.