Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

July 7, 2021Worcester County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Jul 7, 2021, 6:01 PM EDT for Worcester County, Massachusetts. It was in force for 44 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 7, 2021, 6:01 PM EDT (22:01 UTC)
Expired
Jul 7, 2021, 6:45 PM EDT
In force
44 min
Issued by
NWS Boston/Norton, MA

County Worcester County, MA

The radar

The Boston radar (KBOX), 65 km from the middle of the area, began a volume at 22:03 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

Albany, NY (KALY), launched 12:00Z, 10.0 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-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLLFCEL10008507005003002001001 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, Albany, NY at 12:00Z on 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 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
18 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

099 
WWUS81 KBOX 072201
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
601 PM EDT Wed Jul 7 2021
 
MAZ004-005-012-072245-
Southern Worcester MA-Central Middlesex County MA-
Northern Worcester MA-
601 PM EDT Wed Jul 7 2021

...STRONG THUNDERSTORM...

At 601 PM EDT, Doppler radar was tracking a strong thunderstorm over
Holden, or near Worcester, moving east at 20 mph.

Penny size hail and winds in excess of 40 mph will accompany this 
storm. Torrential downpours and cloud to ground lightning can be 
expected.

Locations impacted include...
Worcester, Framingham, Marlborough, Shrewsbury, Natick, Acton,
Hudson, Westborough, Concord, Sudbury, Holden, Ashland, Northborough,
Clinton, Wayland, Leicester, Maynard, Southborough, Littleton and
Lancaster.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when this storm approaches. Winds may be strong enough to
produce minor damage, such as a few downed branches.

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.

These storms may intensify and become capable of producing damage.
Stay tuned for updated statements and possible warnings.

&&

LAT...LON 4223 7191 4240 7198 4255 7146 4229 7136
TIME...MOT...LOC 2201Z 254DEG 20KT 4234 7186 

$$

Loconto

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 4:00 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire60 min
Jul 7, 4:01 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire59 min
Jul 7, 4:05 PM EDTSpecial Weather StatementBOXEssex40 min
Jul 7, 4:33 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex57 min
Jul 7, 5:02 PM EDTSpecial Weather StatementBOXWorcester43 min
Jul 7, 5:05 PM EDTSpecial Marine WarningBOX25 min
Jul 7, 5:10 PM EDTTropical Storm WatchBOXBarnstable, Bristol, Dukes, Nantucket, Plymouth13 hr
Jul 7, 5:21 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire, Worcester54 min
Jul 7, 5:24 PM EDTSpecial Marine WarningBOX66 min
Jul 7, 5:30 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester60 min
Jul 7, 6:17 PM EDTSevere Thunderstorm WarningBOXBristol, Middlesex, Norfolk, Worcester58 min
Jul 7, 6:18 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester36 min
Jul 7, 6:22 PM EDTSpecial Marine WarningBOX53 min
Jul 7, 6:59 PM EDTSevere Thunderstorm WarningBOXBristol, Middlesex, Norfolk, Plymouth, Suffolk61 min
Jul 7, 7:18 PM EDTSpecial Marine WarningBOX57 min
Jul 7, 7:47 PM EDTSevere Thunderstorm WarningBOXNorfolk, Plymouth25 min
Jul 7, 7:51 PM EDTSpecial Marine WarningBOX54 min
Jul 7, 7:45 PM EDTSpecial Weather StatementBOXWashington45 min
Jul 7, 4:50 PM EDTSevere Thunderstorm WarningBOXCapitol Planning Region55 min
Jul 7, 5:53 PM EDTSpecial Weather StatementBOX52 min
Jul 7, 6:38 PM EDTSevere Thunderstorm WarningBOXCapitol Planning Region, Northeastern Connecticut Planning Region43 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.