Alert archive / Massachusetts / Excessive Heat Warnings in 2016

Excessive Heat Warning 1, NWS Boston/Norton, MA

August 12, 2016Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 4 counties in Massachusetts

NWS Boston/Norton, MA issued this excessive heat warning at Aug 12, 2016, 2:22 PM EDT for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 4 counties in Massachusetts. It was in force for 5 hr. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 12, 2016, 2:22 PM EDT (18:22 UTC)
Expired
Aug 12, 2016, 7:00 PM EDT
In force
5 hr
Issued by
NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 42 km from the middle of the area, began a volume at 18:24 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.

What was reported inside it

TimeReportWhereRemark
Aug 12, 4:25 PM EDTLIGHTNINGBedford, MAWIRES DOWN ON PAGE ROAD...TREE DOWN ON OLD BILLERICA ROAD
Aug 12, 4:30 PM EDTLIGHTNINGWakefield, MATREE DOWN ON STEADMAN STREET

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 6.4 hours before the alert went out and 141 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, Chatham, MA at 12:00Z on 2016-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 383 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, Chatham, MA at 12:00Z on 2016-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
383 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
731 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

221 
WWUS71 KBOX 121822
NPWBOX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE TAUNTON MA
222 PM EDT FRI AUG 12 2016

MAZ005>007-013>016-122300-
/O.UPG.KBOX.HT.Y.0003.000000T0000Z-160812T2300Z/
/O.NEW.KBOX.EH.W.0001.160812T1822Z-160812T2300Z/
CENTRAL MIDDLESEX MA-WESTERN ESSEX MA-EASTERN ESSEX MA-
WESTERN NORFOLK MA-SOUTHEAST MIDDLESEX MA-SUFFOLK MA-
EASTERN NORFOLK MA-
INCLUDING THE CITIES OF...FRAMINGHAM...LOWELL...LAWRENCE...
GLOUCESTER...FOXBOROUGH...NORWOOD...CAMBRIDGE...BOSTON...QUINCY
222 PM EDT FRI AUG 12 2016

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED AN EXCESSIVE
HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM EDT THIS EVENING.

* LOCATIONS...NORTHEASTERN MASSACHUSETTS

* HEAT INDEX VALUES...UP TO 107 DUE TO TEMPERATURES IN THE MID TO
  UPPER 90S...AND DEWPOINTS IN THE LOWER TO MID 70S.

* TIMING...THROUGH 7 PM TODAY.

* IMPACTS...EXCESSIVE HEAT MAY LEAD TO HEAT RELATED ILLNESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES WILL OCCUR. THE COMBINATION OF HOT
TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A DANGEROUS
SITUATION IN WHICH HEAT ILLNESSES ARE LIKELY. DRINK PLENTY OF
FLUIDS...STAY IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE
SUNSHINE...AND CHECK UP ON RELATIVES AND NEIGHBORS.

YOUNG CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN
VEHICLES UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING
WARM OR HOT WEATHER WHEN CAR INTERIORS CAN REACH LETHAL
TEMPERATURES IN A MATTER OF MINUTES.

&&

$$

CTZ002>004-122300-
/O.UPG.KBOX.HT.Y.0003.000000T0000Z-160812T2300Z/
/O.NEW.KBOX.EH.W.0001.160812T1822Z-160812T2300Z/
HARTFORD CT-TOLLAND CT-WINDHAM CT-
INCLUDING THE CITIES OF...HARTFORD...WINDSOR LOCKS...UNION...
VERNON...PUTNAM...WILLIMANTIC
222 PM EDT FRI AUG 12 2016

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED AN EXCESSIVE
HEAT WARNING...WHICH IS IN EFFECT UNTIL 7 PM EDT THIS EVENING.

* LOCATIONS...NORTHERN CONNECTICUT.

* HEAT INDEX VALUES...UP TO 109 DUE TO TEMPERATURES IN THE LOWER
  TO MID 90S...AND DEWPOINTS IN THE MID 70S.

* TIMING...THROUGH 7 PM TODAY.

* IMPACTS...EXCESSIVE HEAT MAY LEAD TO HEAT RELATED ILLNESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

AN EXCESSIVE HEAT WARNING MEANS THAT A PROLONGED PERIOD OF
DANGEROUSLY HOT TEMPERATURES WILL OCCUR. THE COMBINATION OF HOT
TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A DANGEROUS
SITUATION IN WHICH HEAT ILLNESSES ARE LIKELY. DRINK PLENTY OF
FLUIDS...STAY IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE
SUNSHINE...AND CHECK UP ON RELATIVES AND NEIGHBORS.

YOUNG CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN
VEHICLES UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING
WARM OR HOT WEATHER WHEN CAR INTERIORS CAN REACH LETHAL
TEMPERATURES IN A MATTER OF MINUTES.

&&

$$

MAZ003-004-010>012-017>019-026-RIZ001>004-122300-
/O.CON.KBOX.HT.Y.0003.000000T0000Z-160812T2300Z/
EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-EASTERN HAMPSHIRE MA-
EASTERN HAMPDEN MA-SOUTHERN WORCESTER MA-NORTHERN BRISTOL MA-
WESTERN PLYMOUTH MA-EASTERN PLYMOUTH MA-NORTHERN MIDDLESEX MA-
NORTHWEST PROVIDENCE RI-SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-
EASTERN KENT RI-
INCLUDING THE CITIES OF...GREENFIELD...ORANGE...BARRE...
FITCHBURG...AMHERST...NORTHAMPTON...SPRINGFIELD...MILFORD...
WORCESTER...TAUNTON...BROCKTON...PLYMOUTH...AYER...FOSTER...
SMITHFIELD...PROVIDENCE...COVENTRY...WEST GREENWICH...
EAST GREENWICH...WARWICK...WEST WARWICK
222 PM EDT FRI AUG 12 2016

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING...

* LOCATIONS...INCLUDE NORTHERN AND CENTRAL RHODE ISLAND...AND
  MASSACHUSETTS FROM THE CONNECTICUT VALLEY TO THE EAST COAST
  EXCEPT FOR THE SOUTH COAST AND NORTHEASTERN MASSACHUSETTS.

* HEAT INDEX VALUES...UP TO 104 DUE TO TEMPERATURES IN THE LOWER
  90S...AND DEWPOINTS IN THE MID 70S.

* TIMING...THROUGH 7 PM TODAY.

* IMPACTS...EXCESSIVE HEAT MAY LEAD TO HEAT RELATED ILLNESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUNSHINE...AND CHECK UP ON RELATIVES AND
NEIGHBORS.

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

&&

$$

RLG

FOR THE LATEST UPDATES...PLEASE VISIT OUR WEBPAGE AT
WWW.WEATHER.GOV/BOSTON

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WWW.FACEBOOK.COM/NWSBOSTON

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@NWSBOSTON
1 follow-up statement
579 
WWUS71 KBOX 122306
NPWBOX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE TAUNTON MA
706 PM EDT FRI AUG 12 2016

CTZ002>004-130715-
/O.EXP.KBOX.EH.W.0001.000000T0000Z-160812T2300Z/
/O.NEW.KBOX.HT.Y.0004.160813T1600Z-160813T2300Z/
HARTFORD CT-TOLLAND CT-WINDHAM CT-
INCLUDING THE CITIES OF...HARTFORD...WINDSOR LOCKS...UNION...
VERNON...PUTNAM...WILLIMANTIC
706 PM EDT FRI AUG 12 2016

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT SATURDAY...
...EXCESSIVE HEAT WARNING HAS EXPIRED...

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM NOON TO 7 PM EDT SATURDAY.

* LOCATIONS...NORTHERN CONNECTICUT.

* HEAT INDEX VALUES...UP TO 102 DUE TO TEMPERATURES IN THE LOWER 90S...AND
  DEWPOINTS IN THE MID 70S.

* TIMING...THROUGH 7 PM SATURDAY.

* IMPACTS...EXCESSIVE HEAT MAY LEAD TO HEAT RELATED ILLNESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUNSHINE...AND CHECK UP ON RELATIVES AND
NEIGHBORS.

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

&&

$$

MAZ005>007-013>016-130015-
/O.EXP.KBOX.EH.W.0001.000000T0000Z-160812T2300Z/
CENTRAL MIDDLESEX MA-WESTERN ESSEX MA-EASTERN ESSEX MA-
WESTERN NORFOLK MA-SOUTHEAST MIDDLESEX MA-SUFFOLK MA-
EASTERN NORFOLK MA-
INCLUDING THE CITIES OF...FRAMINGHAM...LOWELL...LAWRENCE...
GLOUCESTER...FOXBOROUGH...NORWOOD...CAMBRIDGE...BOSTON...QUINCY
706 PM EDT FRI AUG 12 2016

...EXCESSIVE HEAT WARNING HAS EXPIRED...

TEMPERATURES HAVE DROPPED ACROSS THE WARNING AREA. THEREFORE, THE
EXCESSIVE HEAT WARNING HAS BEEN ALLOWED TO EXPIRE.

$$

MAZ010-011-130715-
/O.EXP.KBOX.HT.Y.0003.000000T0000Z-160812T2300Z/
/O.NEW.KBOX.HT.Y.0004.160813T1600Z-160813T2300Z/
EASTERN HAMPSHIRE MA-EASTERN HAMPDEN MA-
INCLUDING THE CITIES OF...AMHERST...NORTHAMPTON...SPRINGFIELD
706 PM EDT FRI AUG 12 2016

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM NOON TO 7 PM EDT SATURDAY.

* LOCATIONS...EASTERN HAMPSHIRE AND EASTERN HAMPDEN COUNTIES.

* HEAT INDEX VALUES...UP TO 102 DUE TO TEMPERATURES IN THE MID 80S...AND
  DEWPOINTS IN THE MID 70S.

* TIMING...THROUGH 7 PM SATURDAY.

* IMPACTS...EXCESSIVE HEAT MAY LEAD TO HEAT RELATED ILLNESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUNSHINE...AND CHECK UP ON RELATIVES AND
NEIGHBORS.

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

&&

$$

MAZ003-004-012-017>019-026-RIZ001>004-130015-
/O.EXP.KBOX.HT.Y.0003.000000T0000Z-160812T2300Z/
EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-SOUTHERN WORCESTER MA-
NORTHERN BRISTOL MA-WESTERN PLYMOUTH MA-EASTERN PLYMOUTH MA-
NORTHERN MIDDLESEX MA-NORTHWEST PROVIDENCE RI-
SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-
INCLUDING THE CITIES OF...GREENFIELD...ORANGE...BARRE...
FITCHBURG...MILFORD...WORCESTER...TAUNTON...BROCKTON...PLYMOUTH...
AYER...FOSTER...SMITHFIELD...PROVIDENCE...COVENTRY...
WEST GREENWICH...EAST GREENWICH...WARWICK...WEST WARWICK
706 PM EDT FRI AUG 12 2016

...HEAT ADVISORY HAS EXPIRED...

TEMPERATURES HAVE FALLEN, RESULTING IN HEAT INDICES BELOW 100
DEGREES. THEREFORE, THE HEAT ADVISORY HAS BEEN ALLOWED TO EXPIRE.

$$

RLG

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WWW.WEATHER.GOV/BOSTON

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YOU CAN FOLLOW US ON TWITTER AT
@NWSBOSTON

What forecasters said that day

The local office's own words before this excessive heat 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 excessive heat warning went out at Aug 12, 2:11 PM EDT, 11 minutes earlier.

Area forecast discussion, Aug 12, 2:11 PM EDT, 11 minutes before
Area Forecast Discussion
National Weather Service Taunton MA
211 PM EDT FRI AUG 12 2016

.SYNOPSIS...
High heat and humidity will persist across the area with a Heat
Advisory in effect for much of the region. Temperatures may be a
little cooler across northeastern MA on Saturday but still
reaching Heat Advisory criteria across much of the CT River
Valley. Scattered mainly afternoon and evening thunderstorms are
expected through Sunday. A break in the heat and showers will
occur Monday into Tuesday before another system approaches the
region by Wednesday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
210 PM Update...Showers and thunderstorms have started to develop
across much of New York and New England this afternoon. SPC
Mesoanalysis shows 2500-3000 J/kg of SBCAPE across a good portion
of southern New England, providing plenty of juice to keep storms
going. Two main concerns with these storms. The first and primary
threat is heavy rain and flooding/flash flooding. With PWATs well
over 2 inches and forecast to come up to near 2.5 inches, heavy
rain is pretty much a given, as is urban and poor drainage
flooding. Two things will contribute to the potential for flash
flooding. One is training of cells over the same area, the other
is how quickly (or not) the storms move. Model forecast Corfidi
vectors show storms to move about 20 kts but current upward
propagation vectors are about 5 kts. Currently storms are moving
about 20 mph which will limit flash flood potential if the storms
don't continue to move over the same areas.

The secondary threat with these storms is wind. While the
environment is not particularly favorable for strong to damaging
winds, there is a modest amount of shear and winds have already
been gusty at the surface. That said, there is potential for a
some isolated wind damage, but not expecting anything widespread.

Lastly, we have the heat. Heat indices across eastern
Massachusetts are well into the low 100's with several locations
feeling as warm as 104 as of 1 PM. Even the Cape and Islands are
showing heat indices into the 90s. Western areas, including
northern CT and RI are hovering right around 100 at this time. Now
that the aviation forecast is up to date, will consider whether to
upgrade the Heat Advisory to an Excessive Heat Warning.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/...
Tonight...Expect showers and thunderstorms to gradually diminish
during the evening with patchy fog developing over the interior
valleys and somewhat more widespread low clouds and areas of fog
along the south coast. Fog will be more likely across any areas that
receive rain. It should be another night of high minimums, possibly
near record values.

Saturday...This day looks to be interesting from multiple
perspectives. A sagging frontal boundary and possibly a weak wave
along the front may provide a focus for more widespread showers and
thunderstorms. Precipitable water values near 2.5 inches with feed
of deep moisture from the SW combined with low level moisture
convergence would seem to be a set up for potentially very heavy
rainfall across some of the area. This may look to be widespread
enough of a threat to warrant a Flash Flood Watch but will need to
evaluate trends over the next 18 to 24 hours. Vertical wind shear
looks to be marginal enough for the potential of a few strong to
severe thunderstorms with wet microbursts but will also want to
evaluate trends for this over the next 18 to 24 hours.

Saturday's temperature forecast is also challenging due to the
boundary sagging into a portion of the forecast area. Models seem to
be fairly consistent in a NE surface flow across northeast MA and
probably at least as far south as Boston's South Shore. In contrast,
interior areas to the west, especially across the CT River Valley
will likely be at least as hot as the prior couple of days with heat
indices topping 100. Chances are that northern CT and the CT River
Valley of west central MA will again reach Head Advisory
thresholds.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
HIGHLIGHTS...

* Potential for showers and thunderstorms with heavy rainfall and a
  localized urban flood threat Sun into Mon

* A break in the 90+ temps by Monday/Tuesday into next week

* Another shot of showers/thunderstorms by mid next week

OVERVIEW...

The 00z guidance is overall in agreement through the period with
issues at the meso-scale level. Bermuda high over the Mid-Atlantic
will continue to pump in tropical moisture into the region. GEFS
continue to show PWAT values 3-4 STD above normal. This anomalous
moisture will interact with a stationary front over the region which
could result in the potential threat for heavy rainfall Sunday into
early Monday. The front will move just offshore by Monday but there
is the potential for another wave during the mid-week bringing a
chance for showers/thunderstorms. Guidance and ensembles show that
this will occur on Wednesday as mid-level ridge will keep late
Monday into Tuesday mostly dry. 850 mb temps are about 1-2 STD above
normal during the period, so have trended temps near or above normal
Wed into Friday.

DETAILS...

Sunday into Sunday night...Moderate Confidence.

Stationary front north of the region will begin to sag southward
during this period. Guidance continues to show a potent shortwave
moving in from the west. This could result in a more widespread
threat for showers and thunderstorms. Timing wise, appears that the
morning hours could be rain free, as the shortwave moves in during
the later half of the day. Heavy rain potential seems likely as PWAT
are above 2.2 inches. Because of this anomalous amount of moisture,
could see more of a flash flooding concern esp across urban regions.
Highest confidence is during Sunday into Sunday night. Still a lot
of timing issue as guidance is still struggling with the location of
the front.

Another day of 90+ temps on Sunday with high dewpoints. This will
result in the potential for more heat headlines as heat index values
reach 100F.

Monday into Tuesday...Moderate confidence.

Guidance is showing that the front will sag south of the region by
Monday morning which will result in a break in the heat.
Temperatures each day will be in the low to mid 80s. Still some
mugginess in the air but it will bring some relief compared to this
weekend.

Mid-level ridge will move over the area as surface high pressure
builds into SNE. This will limit any thunderstorm activity, but
still cannot rule out the potential for a stray shower. High
pressure will begin to shift back southward late Tuesday which
could allow for a round of showers and thunderstorms across the
western half of the region.

Wednesday and beyond...Low Confidence.

Zonal flow continues aloft as another shortwave and its associated
low pressure system approaches the area. This could bring another
round of showers and thunderstorms. Still a lot of uncertainty esp
with the building high over the Mid-Atlantic which could stall
precip timing. This front will also tap into the Gulf moisture which
will keep pooling into the area so precip could linger into
Thursday. Still plenty of details to work out.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
Forecaster Confidence Levels.

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Short Term /through Saturday/...

Through 00Z...Moderate confidence. SCT +SHRA/TSRA expected across
much of the area, lowering conditions to MVFR/IFR briefly. Gusty
winds are also expected with any storms that move through.
Otherwise, VFR conditions prevail.

Tonight...Moderate confidence. Mainly VFR conditions away from the
S coast, with patchy fog and localized IFR conditions over some of
the interior valleys. Along the south coast, MVFR/IFR conditions
are expected in low clouds and fog.

Saturday...Moderate confidence. Some uncertainty but may encounter
more widespread MVFR cigs, especially across northeastern MA.
Occasional IFR cigs/vsbys possible in vicinity of afternoon and
evening thunderstorms.

KBOS TAF...High confidence. Generally VFR conditions expected today
into tonight, although occasional MVFR ceilings possible in vicinity
of afternoon/evening showers and thunderstorms. MVFR cigs may
persist during much of Saturday as a consequence of a NE flow as
well as more showers and embedded thunderstorms.

KBDL TAF...High confidence. VFR conditions expected through the
period except patchy fog may develop late tonight. Also, conditions
may lower briefly to MVFR or even IFR in vicinity of any
thunderstorms.

Outlook /Saturday Night through Wednesday/...

Moderate confidence in exact timing but high confidence that
there will be cigs and vsbys restrictions into Sunday night. The
main issue will be rounds of scattered showers and thunderstorms
especially Sunday into Sunday night. Also, low clouds and fog
patches expected at times during the overnight at early morning
hours. Vsby and cig restrictions will be less by Monday as high
pressure builds lasting into Tuesday.

&&

.MARINE...
Forecaster Confidence Levels.

Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Short Term /through Saturday/...High confidence.

CONFIDENCE...Moderate

Looks like marginal Small Craft Advisory (SCA) conditions will
probably develop today as per the prior forecast and have left
advisories in place. Areas of fog early this morning will likely
diminish very gradually during the day and then become more
widespread again tonight. Scattered afternoon/evening thunderstorms
are possible with accompanying lightning and gusty wind threats.

Outlook /Saturday Night through Wednesday/...

Moderate confidence in trends with low confidence on exact timing.
Southerly wind direction will dominate the period but this will
all depend on where the front stalls. Wave heights will build
thanks to persist southerly flow, resulting in SCA headlines on
Monday. Other concerns for mariners will be areas of fog along
with showers and thunderstorms at times. High pressure will build
over the waters on Monday and last into Tuesday resulting in good
boating weather.

&&

.CLIMATE...
Record high minimum temperatures for August 12 as follows:

BOS  77 set in 1988
BDL  74 set in 1905
PVD  76 set in 1944
ORH  74 set in 1896

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 7 PM EDT this evening for CTZ002>004.
     Air Quality Alert until 11 PM EDT this evening for CTZ002-003.
MA...Heat Advisory until 7 PM EDT this evening for MAZ003>007-
     010>019-026.
RI...Heat Advisory until 7 PM EDT this evening for RIZ001>004.
MARINE...Small Craft Advisory until 5 AM EDT Saturday for ANZ231>234.
     Small Craft Advisory until 8 AM EDT Saturday for ANZ235-237-
     254>256.
     Small Craft Advisory until 11 PM EDT this evening for ANZ250.

&&

SYNOPSIS...Dunten/Thompson
NEAR TERM...Dunten/RLG/Thompson
SHORT TERM...Thompson
LONG TERM...Dunten
AVIATION...Dunten/RLG
MARINE...Dunten/Thompson
CLIMATE...Staff
Hazardous weather outlook, Aug 12, 4:26 AM EDT, 9 hours 56 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TAUNTON MA
426 AM EDT FRI AUG 12 2016

MAZ002-008-009-020>024-RIZ005>008-130830-
WESTERN FRANKLIN MA-WESTERN HAMPSHIRE MA-WESTERN HAMPDEN MA-
SOUTHERN BRISTOL MA-SOUTHERN PLYMOUTH MA-BARNSTABLE MA-DUKES MA-
NANTUCKET MA-BRISTOL RI-WASHINGTON RI-NEWPORT RI-BLOCK ISLAND RI-
426 AM EDT FRI AUG 12 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEASTERN
MASSACHUSETTS...WESTERN MASSACHUSETTS...NORTHERN RHODE ISLAND AND
SOUTHERN RHODE ISLAND.

.DAY ONE...TODAY AND TONIGHT.

THERE IS AN ISOLATED RISK FOR STRONG TO SEVERE THUNDERSTORMS
TODAY. MAIN RISK IS HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR
DRAINAGE FLOODING.

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

SATURDAY INTO SUNDAY...HOT AND VERY HUMID WEATHER WITH HEAT INDEX
VALUES UP TO 100 LIKELY DURING EACH AFTERNOON. HEAT HEADLINES WILL
LIKELY BE NEEDED.

SATURDAY THROUGH SUNDAY NIGHT...ROUNDS OF SHOWERS AND
THUNDERSTORMS ARE EXPECTED WITH AT LEAST LOCALLY HEAVY RAINFALL AT
TIMES. DESPITE OUR CURRENT DROUGHT...THERE WILL BE THE RISK FOR
LOCALIZED FLOODING. IN ADDITION...THERE WILL ALSO BE SOME RISK FOR
STRONG TO SEVERE THUNDERSTORMS OVER THIS PERIOD BUT CONFIDENCE ON
TIMING IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
 CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

CTZ004-MAZ003>007-010>019-026-RIZ001>004-130830-
WINDHAM CT-EASTERN FRANKLIN MA-NORTHERN WORCESTER MA-
CENTRAL MIDDLESEX MA-WESTERN ESSEX MA-EASTERN ESSEX 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-NORTHERN MIDDLESEX MA-NORTHWEST PROVIDENCE RI-
SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI-
426 AM EDT FRI AUG 12 2016

...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 7 PM EDT THIS
EVENING...

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

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

THERE IS AN ISOLATED RISK FOR STRONG TO SEVERE THUNDERSTORMS
TODAY. MAIN RISK IS HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR
DRAINAGE FLOODING.

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

SATURDAY INTO SUNDAY...HOT AND VERY HUMID WEATHER WITH HEAT INDEX
VALUES UP TO 100 LIKELY DURING EACH AFTERNOON. HEAT HEADLINES WILL
LIKELY BE NEEDED.

SATURDAY THROUGH SUNDAY NIGHT...ROUNDS OF SHOWERS AND
THUNDERSTORMS ARE EXPECTED WITH AT LEAST LOCALLY HEAVY RAINFALL AT
TIMES. DESPITE OUR CURRENT DROUGHT...THERE WILL BE THE RISK FOR
LOCALIZED FLOODING. IN ADDITION...THERE WILL ALSO BE SOME RISK FOR
STRONG TO SEVERE THUNDERSTORMS OVER THIS PERIOD BUT CONFIDENCE ON
TIMING IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
 CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

CTZ002-003-130830-
HARTFORD CT-TOLLAND CT-
426 AM EDT FRI AUG 12 2016

...AIR QUALITY ALERT IN EFFECT FROM 11 AM THIS MORNING TO 11 PM EDT
THIS EVENING...
...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 7 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN CONNECTICUT.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   AIR QUALITY ALERT.
   HEAT ADVISORY.

THERE IS AN ISOLATED RISK FOR STRONG TO SEVERE THUNDERSTORMS
TODAY. MAIN RISK IS HEAVY RAIN WHICH COULD LEAD TO URBAN AND POOR
DRAINAGE FLOODING.

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

SATURDAY INTO SUNDAY...HOT AND VERY HUMID WEATHER WITH HEAT INDEX
VALUES UP TO 100 LIKELY DURING EACH AFTERNOON. HEAT HEADLINES WILL
LIKELY BE NEEDED.

SATURDAY THROUGH SUNDAY NIGHT...ROUNDS OF SHOWERS AND
THUNDERSTORMS ARE EXPECTED WITH AT LEAST LOCALLY HEAVY RAINFALL AT
TIMES. DESPITE OUR CURRENT DROUGHT...THERE WILL BE THE RISK FOR
LOCALIZED FLOODING. IN ADDITION...THERE WILL ALSO BE SOME RISK FOR
STRONG TO SEVERE THUNDERSTORMS OVER THIS PERIOD BUT CONFIDENCE ON
TIMING IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
 CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ANZ230>237-250-251-254>256-130830-
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-
426 AM EDT FRI AUG 12 2016

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

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.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.

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 12, 1:54 PM EDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
154 PM EDT FRI AUG 12 2016

MAZ004-010-011-121845-
NORTHERN WORCESTER MA-EASTERN HAMPDEN MA-EASTERN HAMPSHIRE MA-
154 PM EDT FRI AUG 12 2016

...STRONG THUNDERSTORMS DEVELOPING ACROSS WESTERN MASSACHUSETTS...

IN PARTICULAR...AT 153 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG
THUNDERSTORM OVER GRANBY...OR 7 MILES NORTHEAST OF CHICOPEE...MOVING
EAST AT 20 MPH.

WINDS IN EXCESS OF 30 MPH WILL ACCOMPANY THIS STORM ALONG WITH
FREQUENT LIGHTNING AND HEAVY RAIN. THESE STORMS MAY INTENSITY AND
BECOME CAPABLE OF PRODUCING DAMAGE. STAY TUNED FOR UPDATED
STATEMENTS AND POSSIBLE WARNINGS.

LOCATIONS IMPACTED INCLUDE...
CHICOPEE...HOLYOKE...AMHERST...LUDLOW...SOUTH HADLEY...BELCHERTOWN...
WILBRAHAM...PALMER...WARE...MONSON...GRANBY...HADLEY...WARREN...NORTH
BROOKFIELD...WEST BROOKFIELD...BRIMFIELD...HARDWICK...PELHAM AND NEW
BRAINTREE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT LIGHTNING WAS OCCURRING. LIGHTNING CAN STRIKE FAR AWAY FROM
THE STORM. GO INSIDE A BUILDING OR VEHICLE. WAIT AT LEAST 30 MINUTES
UNTIL AFTER THE STORM HAS PASSED TO RESUME OUTDOOR ACTIVITIES.

&&

LAT...LON 4237 7257 4235 7236 4230 7236 4232 7233
      4234 7231 4232 7209 4209 7220 4222 7263
TIME...MOT...LOC 1753Z 278DEG 17KT 4226 7248

SIPPRELL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 8:30 PM EDTSpecial Weather StatementBOX45 min
Aug 11, 8:41 PM EDTAreal Flood AdvisoryBOXCapitol Planning Region64 min
Aug 12, 3:22 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region53 min
Aug 12, 4:14 PM EDTSpecial Weather StatementBOX46 min
Aug 12, 4:28 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region47 min
Aug 12, 5:07 PM EDTSpecial Weather StatementBOX53 min
Aug 12, 5:18 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region42 min
Aug 12, 5:43 PM EDTAreal Flood WarningBOXNortheastern Connecticut Planning Region2 hr
Aug 12, 5:51 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region54 min
Aug 12, 6:11 PM EDTSevere Thunderstorm WarningBOXNortheastern Connecticut Planning Region49 min
Aug 12, 6:15 PM EDTFlash Flood WarningBOXNortheastern Connecticut Planning Region3 hr
Aug 12, 7:06 PM EDTHeat AdvisoryBOXCapitol Planning Region, Northeastern Connecticut Planning Region24 hr
Aug 12, 1:54 PM EDTSpecial Weather StatementBOXHampden51 min
Aug 12, 2:32 PM EDTSpecial Weather StatementBOXHampden, Hampshire43 min
Aug 12, 2:39 PM EDTSpecial Weather StatementBOXWorcester51 min
Aug 12, 2:51 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester39 min
Aug 12, 2:57 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire26 min
Aug 12, 3:56 PM EDTSpecial Weather StatementBOXMiddlesex49 min
Aug 12, 5:17 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire43 min
Aug 12, 5:33 PM EDTSpecial Marine WarningBOX57 min
Aug 12, 6:01 PM EDTSpecial Marine WarningBOX59 min

Nearby

Excessive Heat Warnings in Massachusetts, 2016Excessive Heat Warnings in Connecticut, 2016Every excessive heat warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.