Alert archive / Massachusetts / Special Weather Statements in 2017

Special Weather Statement, NWS Boston/Norton, MA

August 18, 2017Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Aug 18, 2017, 8:23 AM EDT for Hampshire County, Massachusetts. It was in force for 37 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, 2017, 8:23 AM EDT (12:23 UTC)
Expired
Aug 18, 2017, 9:00 AM EDT
In force
37 min
Issued by
NWS Boston/Norton, MA

County Hampshire County, MA

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 0.4 hours before the alert went out and 81 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 2017-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 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 2017-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 362 square meters per square second.19395878Sfc1 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
105 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
506 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
362 m²/s²
0-3 km storm-relative helicity
456 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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, 6:49 AM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Aug 18, 6:49 AM EDT, 1 hour 34 minutes before
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Hazardous weather outlook, Aug 18, 6:52 AM EDT, 1 hour 31 minutes before
Hazardous Weather Outlook
National Weather Service Taunton MA
652 AM EDT Fri Aug 18 2017

CTZ002>004-MAZ002>024-026-RIZ001>008-191100-
Hartford CT-Tolland CT-Windham CT-Western Franklin MA-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Eastern Essex MA-Western Hampshire MA-
Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-
Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA-
Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-Block Island RI-
652 AM EDT Fri Aug 18 2017

This Hazardous Weather Outlook is for northern Connecticut, all of
Massachusetts except Berkshire County, and Rhode Island.

.DAY ONE...Today and Tonight.

There is a low to moderate risk for locally heavy downpours that
bring urban and poor drainage flooding this afternoon and tonight.

There is a low risk of wind damage this afternoon and evening,
mainly in western Massachusetts and Connecticut.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

ANZ230>237-250-251-254>256-191100-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
Coastal Waters extending out to 25 nm South of Marthas Vineyard and
Nantucket-
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 nm South of Block Island-
652 AM EDT Fri Aug 18 2017

This Hazardous Weather Outlook is for Massachusetts and Rhode
Island coastal waters.

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston

In the hours before

Special weather statement, Aug 18, 8:23 AM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
823 AM EDT FRI AUG 18 2017

MAZ002-003-008>010-181300-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
Eastern Franklin MA-Eastern Hampshire MA-
823 AM EDT FRI AUG 18 2017

...Brief heavy showers moving into western Hampshire and Hampden
Counties...

At 819 AM EDT, Doppler radar was tracking a cluster of heavy rain
showers in Berkshire County from Lenox to South Egremont. Movement
was northeast at 40 mph. Although they will last for only a brief
time, they will produce heavy downpours. A clap or two of thunder is
also possible.

Locations impacted include...
Northampton, Greenfield, Deerfield, Southampton, Williamsburg,
Huntington, Bernardston, Buckland, Conway, Shelburne, Russell,
Ashfield, Colrain, Westhampton, Whately, Chester, Charlemont,
Blandford, Chesterfield and Worthington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be on the lookout for local ponding of water on roadways as these
showers move through.

&&

LAT...LON 4215 7303 4227 7300 4231 7300 4231 7303
      4233 7306 4238 7307 4239 7305 4238 7301
      4239 7301 4260 7296 4273 7256 4220 7278
      4213 7307 4215 7307
TIME...MOT...LOC 1219Z 241DEG 34KT 4236 7316 4207 7335

Field

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 2:49 PM EDTSpecial Weather StatementBOXDukes86 min
Aug 18, 3:23 PM EDTAreal Flood WarningBOXDukes112 min
Aug 18, 3:39 PM EDTSpecial Weather StatementBOXDukes81 min
Aug 18, 1:37 PM EDTSpecial Weather StatementBOXNewport83 min

Nearby

Special Weather Statements in Massachusetts, 2017Every 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.