Alert archive / Massachusetts / Special Weather Statements in 2015

Special Weather Statement, NWS Boston/Norton, MA

August 21, 2015Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this special weather statement at Aug 21, 2015, 9:11 PM EDT for Plymouth County, Massachusetts. It was in force for 49 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 21, 2015, 9:11 PM EDT (01:11 UTC)
Expired: Aug 21, 2015, 10:00 PM EDT
In force: 49 min
Issued by: NWS Boston/Norton, MA

County Plymouth County, MA

The radar

The Boston radar (KBOX), 44 km from the middle of the area, began a volume at 01:12 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

Chatham, MA (KCHH), launched 00:00Z, 1.2 hours before the alert went out and 59 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 606 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 21, 8:42 PM EDT, 29 minutes earlier.

Area forecast discussion, Aug 21, 8:42 PM EDT, 29 minutes before

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Hazardous weather outlook, Aug 21, 5:12 PM EDT, 3 hours 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAUNTON MA
512 PM EDT FRI AUG 21 2015

CTZ002>004-MAZ002>006-008>013-017-018-026-RIZ001>005-222115-
HARTFORD CT-TOLLAND CT-WINDHAM CT-WESTERN FRANKLIN MA-
EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-CENTRAL MIDDLESEX MA-
WESTERN ESSEX MA-WESTERN HAMPSHIRE MA-WESTERN HAMPDEN MA-
EASTERN HAMPSHIRE MA-EASTERN HAMPDEN MA-SOUTHERN WORCESTER MA-
WESTERN NORFOLK MA-NORTHERN BRISTOL MA-WESTERN PLYMOUTH MA-
NORTHERN MIDDLESEX MA-NORTHWEST PROVIDENCE RI-
SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-BRISTOL RI-
512 PM EDT FRI AUG 21 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN CONNECTICUT...CENTRAL
MASSACHUSETTS...EASTERN
MASSACHUSETTS...NORTHEASTERN MASSACHUSETTS...SOUTHEASTERN
MASSACHUSETTS...WESTERN MASSACHUSETTS AND NORTHERN RHODE ISLAND.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE IS A LOW RISK THAT SHOWERS AND THUNDERSTORMS COULD PRODUCE
LOCALIZED URBAN AND POOR DRAINAGE FLOODING ON SATURDAY AND AGAIN
ON SUNDAY.

THERE IS A MODERATE RISK OF A FEW STRONG TO SEVERE THUNDERSTORMS
ON TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

MAZ007-014>016-019>024-RIZ006>008-222115-
EASTERN ESSEX MA-SOUTHEAST MIDDLESEX MA-SUFFOLK MA-
EASTERN NORFOLK MA-EASTERN PLYMOUTH MA-SOUTHERN BRISTOL MA-
SOUTHERN PLYMOUTH MA-BARNSTABLE MA-DUKES MA-NANTUCKET MA-
WASHINGTON RI-NEWPORT RI-BLOCK ISLAND RI-
512 PM EDT FRI AUG 21 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN
MASSACHUSETTS...NORTHEASTERN MASSACHUSETTS...SOUTHEASTERN
MASSACHUSETTS AND SOUTHERN RHODE ISLAND.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE IS A LOW RISK THAT SHOWERS AND THUNDERSTORMS COULD PRODUCE
LOCALIZED URBAN AND POOR DRAINAGE FLOODING ON SATURDAY AND AGAIN
ON SUNDAY.

THERE IS A LOW PROBABILITY THAT A LOW PRESSURE SYSTEM NEAR BERMUDA
COULD ACQUIRE SUBTROPICAL OR TROPICAL CHARACTERISTICS BEFORE
PASSING WELL TO THE EAST OF NANTUCKET AROUND MONDAY. THE MAIN
IMPACT FROM THIS WOULD BE AN INCREASED RISK OF RIP CURRENTS ALONG
OCEAN EXPOSED BEACHES...ESPECIALLY ON CAPE COD AND THE ISLANDS.

THERE IS A MODERATE RISK OF A FEW STRONG TO SEVERE THUNDERSTORMS
ON TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

ANZ230>237-250-251-254>256-222115-
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-
512 PM EDT FRI AUG 21 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MASSACHUSETTS AND RHODE
ISLAND COASTAL WATERS.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THERE IS A LOW PROBABILITY THAT A LOW PRESSURE SYSTEM NEAR BERMUDA
COULD ACQUIRE SUBTROPICAL OR TROPICAL CHARACTERISTICS BEFORE
PASSING WELL TO THE EAST OF NANTUCKET ON MONDAY. MAIN IMPACT
WOULD BE INCREASING SWELLS AND GUSTS TO NEAR SMALL CRAFT ADVISORY
LEVELS. MARINERS SHOULD STAY TUNED FOR LATER INFORMATION ABOUT
THIS POTENTIAL.

.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 21, 7:02 PM EDT, 2 hours 9 minutes before

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Special weather statement, Aug 21, 8:16 PM EDT, 55 minutes before

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Special weather statement, Aug 21, 9:11 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
911 PM EDT FRI AUG 21 2015

MAZ019-220200-
EASTERN PLYMOUTH-
911 PM EDT FRI AUG 21 2015

...HEAVY RAIN SHOWERS MAY RESULT IN POOR DRAINAGE STREET FLOODING
ACROSS SOUTHEAST PLYMOUTH COUNTY THROUGH 10 PM...

AT 908 PM EDT...HEAVY SHOWERS WERE RESULTING IN A QUICK 1 TO 1.50
INCHES OF RAIN IN AN HOUR.  THIS MAY RESULT IN AREAS OF POOR
DRAINAGE STREET FLOODING.  MOTORISTS ARE URGED TO DRIVE WITH EXTRA
CAUTION AND DO NOT DIVE THROUGH FLOODED ROADS.

LOCATIONS IMPACTED INCLUDE...
PLYMOUTH AND WAREHAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE THROUGH FLOODED ROADS.

&&

LAT...LON 4183 7054 4180 7066 4180 7067 4195 7073
      4200 7063 4197 7067 4197 7065 4196 7066
      4194 7060 4201 7061 4195 7060 4192 7054
      4189 7053 4184 7053
TIME...MOT...LOC 0108Z 239DEG 48KT 4192 7059

FRANK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 8:16 PM EDT	Special Weather Statement	BOX	Plymouth	44 min
Aug 22, 2:33 AM EDT	Special Weather Statement	BOX	Bristol	42 min
Aug 22, 2:56 AM EDT	Flash Flood Watch	BOX	Bristol	13 hr
Aug 22, 4:47 PM EDT	Special Weather Statement	BOX	Barnstable	43 min

Nearby

Special Weather Statements in Massachusetts, 2015 Every special weather statement in 2015

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.