Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 126, NWS Boston/Norton, MA

August 5, 2010Norfolk County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 5, 2010, 5:10 PM EDT for Norfolk County, Plymouth County, Massachusetts. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 5, 2010, 5:10 PM EDT (21:10 UTC)
Expired: Aug 5, 2010, 5:31 PM EDT
In force: 21 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Norfolk County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 20 km from the middle of the area, began a volume at 21:12 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 12:00Z, 9.2 hours before the alert went out and 94 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: 1016 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 446 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 5, 4:40 PM EDT, 30 minutes earlier.

Area forecast discussion, Aug 5, 4:40 PM EDT, 30 minutes before

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Hazardous weather outlook, Aug 5, 4:27 AM EDT, 12 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAUNTON MA
427 AM EDT THU AUG 5 2010

CTZ002>004-MAZ002>024-026-NHZ011-012-015-RIZ001>008-060830-
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-CHESHIRE NH-EASTERN HILLSBOROUGH NH-
WESTERN AND CENTRAL HILLSBOROUGH NH-NORTHWEST PROVIDENCE RI-
SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-BRISTOL RI-
WASHINGTON RI-NEWPORT RI-BLOCK ISLAND RI-
427 AM EDT THU AUG 5 2010

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

.DAY ONE...TODAY AND TONIGHT.
SHOWERS AND THUNDERSTORMS MAY RESULT IN LOCALLY HEAVY RAINFALL AND
ASSOCIATED URBAN/POOR DRAINAGE STREET FLOODING TODAY. THERE IS
EVEN A LOW PROBABILITY FOR AN ISOLATED FLASH FLOOD EVENT.

IN ADDITION...A FEW STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE
TODAY. THE MAIN THREAT FROM ANY SEVERE THUNDERSTORM WOULD BE AN
STRONG TO DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED FOR TODAY.

ANZ230>237-250-251-254>256-060830-
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-
427 AM EDT THU AUG 5 2010

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

.DAY ONE...TODAY AND TONIGHT.

A FEW STRONG THUNDERSTORMS WITH GUSTY WINDS ARE POSSIBLE TODAY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 5, 3:52 PM EDT, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
352 PM EDT THU AUG 5 2010

CTZ004-MAZ012-013-RIZ001-052045-
NORTHWEST PROVIDENCE RI-SOUTHERN WORCESTER MA-WESTERN NORFOLK
MA-WINDHAM CT-
352 PM EDT THU AUG 5 2010

AT 348 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH 4 MILES
SOUTHWEST OF DOUGLAS...OR ABOUT 9 MILES NORTHEAST OF PUTNAM...MOVING
EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...SUTTON...DOUGLAS...
  WHITINSVILLE...NORTHBRIDGE...UXBRIDGE...MILLVILLE...UPTON...
  MENDON...HOPEDALE...BLACKSTONE...MILFORD...BELLINGHAM...MEDWAY...
  FRANKLIN...WRENTHAM...MILLIS...NORFOLK...MEDFIELD AND DOVER.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AND PONDING OF WATER IN
LOW LYING AREAS SUCH AS UNDERPASSES. DO NOT DRIVE THROUGH FLOODED
ROADS.

THIS STORM WAS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. GET
INDOORS OR INSIDE A VEHICLE NOW! IF YOU ARE CAUGHT OUTSIDE...STAY
AWAY FROM ISOLATED TALL OBJECTS SUCH AS TREES. AVOID OPEN AREAS SUCH
AS GOLF COURSES AND BALL FIELDS.

&&

LAT...LON 4220 7156 4218 7155 4217 7148 4216 7147
      4218 7145 4218 7140 4219 7139 4220 7135
      4224 7133 4226 7127 4205 7125 4190 7204
      4208 7211

FRANK

Special weather statement, Aug 5, 4:06 PM EDT, 1 hour 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
406 PM EDT THU AUG 5 2010

MAZ019-052045-
EASTERN PLYMOUTH MA-
406 PM EDT THU AUG 5 2010

AT 405 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH 2 MILES
EAST OF HINGHAM...OR ABOUT 6 MILES NORTHEAST OF WEYMOUTH...MOVING
EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...NORWELL...COHASSET AND SCITUATE.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AND PONDING OF WATER IN
LOW LYING AREAS SUCH AS UNDERPASSES. DO NOT DRIVE THROUGH FLOODED
ROADS.

THIS STORM WAS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. GET
INDOORS OR INSIDE A VEHICLE NOW! IF YOU ARE CAUGHT OUTSIDE...STAY
AWAY FROM ISOLATED TALL OBJECTS SUCH AS TREES. AVOID OPEN AREAS SUCH
AS GOLF COURSES AND BALL FIELDS.

&&

LAT...LON 4215 7084 4215 7088 4217 7089 4217 7091
      4225 7093 4227 7090 4229 7090 4230 7093
      4231 7089 4227 7085 4227 7082 4225 7079
      4225 7078 4220 7071 4216 7071

FRANK

Special weather statement, Aug 5, 4:20 PM EDT, 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
420 PM EDT THU AUG 5 2010

MAZ012-013-016-017-RIZ001-052100-
EASTERN NORFOLK MA-NORTHERN BRISTOL MA-NORTHWEST PROVIDENCE
RI-SOUTHERN WORCESTER MA-WESTERN NORFOLK MA-
420 PM EDT THU AUG 5 2010

AT 417 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH OVER
WOONSOCKET...MOVING EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...CUMBERLAND...BELLINGHAM...
  MEDWAY...FRANKLIN...PLAINVILLE...NORTH ATTLEBOROUGH...WRENTHAM...
  NORFOLK...FOXBOROUGH...MANSFIELD...WALPOLE...NORTON...SHARON...
  WEYMOUTH...STOUGHTON...RANDOLPH...HOLBROOK...EASTON...CANTON AND
  AVON.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AND PONDING OF WATER IN
LOW LYING AREAS SUCH AS UNDERPASSES. DO NOT DRIVE THROUGH FLOODED
ROADS.

THIS STORM WAS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. GET
INDOORS OR INSIDE A VEHICLE NOW! IF YOU ARE CAUGHT OUTSIDE...STAY
AWAY FROM ISOLATED TALL OBJECTS SUCH AS TREES. AVOID OPEN AREAS SUCH
AS GOLF COURSES AND BALL FIELDS.

&&

LAT...LON 4209 7108 4200 7105 4195 7105 4190 7170
      4208 7170 4221 7094 4215 7093

FRANK

Special weather statement, Aug 5, 4:22 PM EDT, 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
422 PM EDT THU AUG 5 2010

MAZ005-013>016-052100-
CENTRAL MIDDLESEX COUNTY MA-EASTERN NORFOLK MA-SOUTHEAST MIDDLESEX
MA-SUFFOLK MA-WESTERN NORFOLK MA-
422 PM EDT THU AUG 5 2010

AT 417 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH 2 MILES
WEST OF DOVER...OR ABOUT 7 MILES SOUTHEAST OF FRAMINGHAM...MOVING
EAST AT 30 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...NEEDHAM...WESTWOOD...NORWOOD...
  NEWTON...DEDHAM...WEST ROXBURY...ROSLINDALE...BRIGHTON...
  BROOKLINE...HYDE PARK...ALLSTON...FOREST HILLS...JAMAICA PLAIN...
  MATTAPAN...MILTON...DORCHESTER...RANDOLPH...BOSTON...SOUTH
  BOSTON...BRAINTREE...QUINCY...EAST BOSTON...WEYMOUTH AND WINTHROP.

FOR YOUR SAFETY...GET INSIDE WHEN THIS STORM APPROACHES. WINDS MAY BE
STRONG ENOUGH TO BRING DOWN SMALL BRANCHES. MINOR STREET FLOODING AND
PONDING OF WATER IN POOR DRAINAGE AREAS IS ALSO POSSIBLE.

HEAVY RAIN MAY CAUSE MINOR STREET FLOODING AND PONDING OF WATER IN
LOW LYING AREAS SUCH AS UNDERPASSES. DO NOT DRIVE THROUGH FLOODED
ROADS.

THIS STORM WAS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. GET
INDOORS OR INSIDE A VEHICLE NOW! IF YOU ARE CAUGHT OUTSIDE...STAY
AWAY FROM ISOLATED TALL OBJECTS SUCH AS TREES. AVOID OPEN AREAS SUCH
AS GOLF COURSES AND BALL FIELDS.

&&

LAT...LON 4218 7092 4212 7144 4229 7146 4240 7102
      4240 7098 4239 7096 4234 7095 4234 7101
      4230 7104 4231 7102 4232 7095 4228 7101
      4227 7099 4227 7095 4225 7096 4225 7093
      4222 7091

FRANK

Special weather statement, Aug 5, 4:44 PM EDT, 26 minutes before

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Special weather statement, Aug 5, 4:59 PM EDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 5:08 AM EDT	Small Craft Advisory for Hazardous Seas	BOX		47 hr
Aug 5, 9:39 AM EDT	Special Marine Warning	BOX		51 min
Aug 5, 9:45 AM EDT	Severe Thunderstorm Warning	BOX	Bristol	45 min
Aug 5, 11:24 AM EDT	Special Weather Statement	BOX	Dukes	51 min
Aug 5, 11:46 AM EDT	Special Marine Warning	BOX		59 min
Aug 5, 11:48 AM EDT	Special Weather Statement	BOX	Nantucket	57 min
Aug 5, 12:39 PM EDT	Special Marine Warning	BOX		66 min
Aug 5, 12:44 PM EDT	Severe Thunderstorm Warning	BOX	Nantucket	31 min
Aug 5, 1:14 PM EDT	Special Weather Statement	BOX	Nantucket	31 min
Aug 5, 2:03 PM EDT	Special Weather Statement	BOX	Hampden	42 min
Aug 5, 2:36 PM EDT	Special Weather Statement	BOX	Worcester	39 min
Aug 5, 2:39 PM EDT	Areal Flood Advisory	BOX	Hampden, Hampshire, Worcester	114 min
Aug 5, 2:53 PM EDT	Special Weather Statement	BOX	Worcester	52 min
Aug 5, 2:59 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	95 min
Aug 5, 3:21 PM EDT	Special Weather Statement	BOX	Middlesex	39 min
Aug 5, 3:27 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Suffolk	3 hr
Aug 5, 3:37 PM EDT	Special Weather Statement	BOX	Essex	38 min
Aug 5, 3:59 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Suffolk	2 hr
Aug 5, 4:06 PM EDT	Special Weather Statement	BOX	Suffolk	39 min
Aug 5, 4:20 PM EDT	Special Weather Statement	BOX	Norfolk	40 min
Aug 5, 4:22 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	38 min
Aug 5, 4:28 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk	34 min
Aug 5, 4:29 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth	117 min
Aug 5, 4:44 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Worcester	89 min
Aug 5, 4:44 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	46 min
Aug 5, 4:47 PM EDT	Special Marine Warning	BOX		58 min
Aug 5, 4:59 PM EDT	Special Weather Statement	BOX	Suffolk	46 min
Aug 5, 5:13 PM EDT	Special Marine Warning	BOX		62 min
Aug 5, 5:45 PM EDT	Special Marine Warning	BOX		24 min
Aug 5, 6:28 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	26 min
Aug 5, 8:59 AM EDT	Special Weather Statement	BOX	Washington	31 min
Aug 5, 9:21 AM EDT	Special Weather Statement	BOX	Washington	24 min
Aug 5, 3:35 PM EDT	Special Weather Statement	BOX	Providence	40 min
Aug 5, 3:52 PM EDT	Special Weather Statement	BOX	Providence	53 min
Aug 5, 6:44 AM EDT	Special Weather Statement	BOX		46 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2010 Every severe thunderstorm warning in 2010

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.