Alert archive / Massachusetts / Special Weather Statements in 2017

Special Weather Statement, NWS Boston/Norton, MA

August 23, 2017Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Aug 23, 2017, 2:11 AM EDT for Middlesex County, Massachusetts. It was in force for 34 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 23, 2017, 2:11 AM EDT (06:11 UTC)
Expired
Aug 23, 2017, 2:45 AM EDT
In force
34 min
Issued by
NWS Boston/Norton, MA

County Middlesex County, MA

The radar

The Boston radar (KBOX), 42 km from the middle of the area, began a volume at 06:15 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 00:00Z, 6.2 hours before the alert went out and 197 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 00:00Z on 2017-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 808 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, Gray, ME at 00:00Z on 2017-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 290 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
808 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
1033 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
290 m²/s²
0-3 km storm-relative helicity
296 m²/s²
Significant tornado parameter
1.1
Supercell composite
8.3

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 23, 1:57 AM EDT, 14 minutes earlier.

Area forecast discussion, Aug 23, 1:57 AM EDT, 14 minutes before
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Hazardous weather outlook, Aug 23, 1:36 AM EDT, 35 minutes before
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In the hours before

Special weather statement, Aug 22, 9:56 PM EDT, 4 hours 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
956 PM EDT TUE AUG 22 2017

MAZ002-003-008>010-230230-
Western Franklin MA-Western Hampshire MA-Western Hampden MA-
Eastern Franklin MA-Eastern Hampshire MA-
956 PM EDT TUE AUG 22 2017

...Strong Thunderstorm in western Hampshire...Franklin and
northwestern Hampden Counties...

At 955 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Colrain to near Housatonic. Movement was
east at 45 mph.

Winds in excess of 40 mph will accompany with these storms along
with torrential downpours and possible minor localized flooding.

Locations impacted include...
Northampton, Greenfield, Deerfield, Montague, Southampton,
Sunderland, Hatfield, Northfield, Williamsburg, Huntington,
Bernardston, Buckland, Conway, Shelburne, Erving, Russell, Ashfield,
Colrain, Westhampton and Gill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4239 7301 4265 7295 4274 7284 4272 7233
      4221 7283 4220 7302 4231 7300 4231 7303
      4233 7306 4238 7307
TIME...MOT...LOC 0155Z 259DEG 60KT 4276 7277 4223 7343

Nocera
Special weather statement, Aug 22, 11:09 PM EDT, 3 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
1109 PM EDT TUE AUG 22 2017

MAZ003-004-009>011-026-230415-
Northwest Middlesex County MA-Western Hampden MA-Eastern Hampden MA-
Northern Worcester MA-Eastern Franklin MA-Eastern Hampshire MA-
1109 PM EDT TUE AUG 22 2017

...Strong Thunderstorm in northwestern Worcester...southeastern
Hampshire...northwestern Middlesex...southeastern Franklin and
central Hampden Counties...

At 1108 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Royalston to Easthampton. Movement was east at
35 mph.

Wind gusts up to 50 mph will accompany with these storms along with
torrential downpours and minor localized flooding possible.

Locations impacted include...
Chicopee, Fitchburg, Holyoke, Amherst, Northampton, Orange, Ludlow,
Gardner, South Hadley, Easthampton, Belchertown, Palmer, Athol,
Winchendon, Ware, Townsend, Templeton, Rutland, Westminster and
Granby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4270 7170 4221 7223 4220 7283 4269 7221
      4272 7212
TIME...MOT...LOC 0308Z 250DEG 30KT 4267 7219 4228 7267

Nocera
Special weather statement, Aug 22, 11:47 PM EDT, 2 hours 24 minutes before
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Special weather statement, Aug 23, 12:40 AM EDT, 1 hour 31 minutes before
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Local storm report, Aug 23, 12:55 AM EDT, 1 hour 16 minutes before
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Special weather statement, Aug 23, 2:11 AM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 9:56 PM EDTSpecial Weather StatementBOXFranklin34 min
Aug 22, 10:08 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire55 min
Aug 22, 11:09 PM EDTSpecial Weather StatementBOXFranklin66 min
Aug 22, 11:33 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Middlesex, Worcester57 min
Aug 22, 11:47 PM EDTSpecial Weather StatementBOXHampden43 min
Aug 23, 12:40 AM EDTSpecial Weather StatementBOXMiddlesex35 min
Aug 23, 12:13 AM EDTSevere Thunderstorm WarningBOXCapitol Planning Region, Northeastern Connecticut Planning Region19 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; radar from the NEXRAD Level II archive.