Alert archive / Massachusetts / Special Weather Statements in 2021

Special Weather Statement, NWS Boston/Norton, MA

May 23, 2021Worcester County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at May 23, 2021, 4:02 PM EDT for Worcester County, Massachusetts. It was in force for 28 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
May 23, 2021, 4:02 PM EDT (20:02 UTC)
Expired
May 23, 2021, 4:30 PM EDT
In force
28 min
Issued by
NWS Boston/Norton, MA

County Worcester County, MA

The radar

The Boston radar (KBOX), 57 km from the middle of the area, began a volume at 20:04 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, 8.0 hours before the alert went out and 182 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 2021-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
908 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
150 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.

537 
WWUS81 KBOX 232002
SPSBOX

Special Weather Statement
National Weather Service Boston/Norton MA
402 PM EDT Sun May 23 2021
 
MAZ003-004-012-232030-
Southern Worcester MA-Northern Worcester MA-Eastern Franklin MA-
402 PM EDT Sun May 23 2021

...LINE OF SHOWERS BRING GUSTY WINDS...

At 402 PM EDT, Doppler radar was tracking showers along a line 
extending from Princeton to near Athol. Movement was southeast at 35 
mph.

Winds in excess of 40 mph will accompany these storms.

Locations impacted include...
Worcester, Shrewsbury, Milford, Orange, Westborough, Grafton, Holden,
Auburn, Northbridge, Hopkinton, Northborough, Holliston, Millbury,
Spencer, Athol, Leicester, Sutton, Templeton, Rutland and Sterling.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get indoors when these showers approach. Winds may be strong enough 
to produce minor damage, such as a few downed branches.

&&

LAT...LON 4248 7184 4227 7157 4226 7159 4221 7160
      4218 7155 4219 7154 4219 7150 4217 7150
      4217 7148 4213 7148 4224 7211 4256 7234
TIME...MOT...LOC 2000Z 321DEG 30KT 4245 7189 4252 7225 

$$

Gaucher

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 3:27 AM EDTSmall Craft AdvisoryBOX18 hr

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.