Alert archive / Massachusetts / Coastal Flood Statements in 2020

Coastal Flood Statement 4, NWS Boston/Norton, MA

April 27, 2020Barnstable County, Nantucket County, Massachusetts

NWS Boston/Norton, MA issued this coastal flood statement at Apr 27, 2020, 4:29 PM EDT for Barnstable County, Nantucket County, Massachusetts. It took effect at Apr 28, 2020, 2:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Apr 27, 2020, 4:29 PM EDT (20:29 UTC)
In effect from
Apr 28, 2020, 2:00 AM EDT
Expired
Apr 28, 2020, 6:00 AM EDT
In force
4 hr
Issued by
NWS Boston/Norton, MA

Counties Barnstable County, MA, Nantucket County, MA

The radar

The Boston radar (KBOX), 98 km from the middle of the area, began a volume at 20:29 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, 8.5 hours before the alert went out and 26 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 2020-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2020-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 184 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
526 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
184 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

455 
WHUS41 KBOX 272029
CFWBOX

Coastal Hazard Message
National Weather Service Boston/Norton MA
429 PM EDT Mon Apr 27 2020

MAZ022-024-280430-
/O.NEW.KBOX.CF.S.0004.200428T0600Z-200428T1000Z/
Barnstable MA-Nantucket MA-
429 PM EDT Mon Apr 27 2020

* WHAT...Up to one half foot of inundation above ground level 
  expected in low-lying areas near shorelines and tidal 
  waterways (3.0 to 12.0 feet Mean Lower Low Water).

* WHERE...Barnstable MA and Nantucket MA Counties.

* WHEN...From 2 AM EDT Tuesday through late tonight.

* IMPACTS...Minor coastal flooding begins on Easy Street in 
  Nantucket.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

&&

Time of high total tides are approximate to the nearest hour.

Wings Neck
MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft
MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/12 AM   4.5/ 5.0   0.1/ 0.6   0.5/ 1.0     1       None    
 28/12 PM   4.0/ 4.5  -0.3/ 0.2   0.8/ 1.3     1       None    
 29/01 AM   4.2/ 4.7  -0.2/ 0.2   0.2/ 0.8     1       None    
 29/01 PM   3.6/ 4.1  -0.9/-0.4   0.2/ 0.8     1       None    
 30/01 AM   4.5/ 5.0   0.1/ 0.6   0.8/ 1.3     2       None    
 30/02 PM   4.4/ 4.9   0.0/ 0.5   1.0/ 1.5    3-4      None

Provincetown Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/04 PM   9.7/10.2  -0.5/ 0.0   1.8/ 2.2     1       None    
 28/03 AM  11.0/11.5   0.9/ 1.4   1.5/ 2.0     1       None    
 28/03 PM   9.3/ 9.8  -0.9/-0.4   0.9/ 1.4     1       None    
 29/04 AM   9.9/10.4  -0.2/ 0.2   0.6/ 1.1     1       None    
 29/04 PM   8.9/ 9.4  -1.3/-0.8   0.6/ 1.1     3       None    
 30/04 AM   9.8/10.3  -0.3/ 0.2   0.7/ 1.1    3-4      None

Chatham MA - East Coast
MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft
MHHW Categories - Minor 1.3 ft, Moderate 3.8 ft, Major 5.3 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/04 PM   7.8/ 8.4   0.2/ 0.7   1.6/ 2.0   9-10      None    
 28/03 AM   8.8/ 9.3   1.1/ 1.6   1.4/ 1.9   9-10     Minor    
 28/04 PM   7.4/ 7.9  -0.3/ 0.2   0.8/ 1.3    6-7      None    
 29/04 AM   7.8/ 8.4   0.2/ 0.7   0.5/ 1.0    4-5      None    
 29/05 PM   7.0/ 7.5  -0.8/-0.2   0.5/ 1.0     4       None    
 30/05 AM   8.0/ 8.5   0.2/ 0.8   0.7/ 1.1    4-5      None

Buzzards Bay at Woods Hole
MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft
MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/12 AM   3.2/ 3.7   1.2/ 1.7   1.0/ 1.5     2       None    
 28/01 PM   2.5/ 3.0   0.5/ 1.0   1.0/ 1.5     1       None    
 29/01 AM   2.7/ 3.2   0.7/ 1.1   0.5/ 1.0     1       None    
 29/02 PM   2.1/ 2.6   0.1/ 0.6   0.5/ 1.0     1       None    
 30/02 AM   3.0/ 3.5   1.0/ 1.5   0.9/ 1.4     2       None

Dennis - Sesuit Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/04 PM  10.2/10.7  -0.3/ 0.2   2.0/ 2.5     3       None    
 28/03 AM  11.8/12.3   1.3/ 1.8   1.9/ 2.3    3-4      None    
 28/03 PM   9.8/10.3  -0.8/-0.2   1.0/ 1.5    2-3      None    
 29/03 AM  10.3/10.8  -0.2/ 0.2   0.6/ 1.1     1       None    
 29/04 PM   9.3/ 9.8  -1.3/-0.8   0.6/ 1.1     2       None    
 30/04 AM  10.2/10.7  -0.3/ 0.2   0.7/ 1.1     3       None

Chatham - South side
MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft
MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/04 AM   5.5/ 6.0   1.0/ 1.5   0.9/ 1.4    2-3      None    
 28/04 PM   4.6/ 5.1   0.1/ 0.6   0.8/ 1.3    1-2      None    
 29/04 AM   5.0/ 5.5   0.5/ 1.0   0.5/ 1.0     1       None    
 29/06 PM   4.4/ 4.9  -0.2/ 0.3   0.6/ 1.1    2-3      None    
 30/06 AM   5.2/ 5.7   0.8/ 1.3   0.9/ 1.4    3-4      None

Sandwich Harbor
MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/04 PM  10.1/10.6  -0.2/ 0.2   2.1/ 2.6    8-9      None    
 28/03 AM  11.4/11.9   1.1/ 1.6   1.8/ 2.2    7-8      None    
 28/03 PM   9.5/10.0  -0.9/-0.4   1.0/ 1.5    3-5      None    
 29/03 AM  10.0/10.5  -0.3/ 0.2   0.6/ 1.1     1       None    
 29/04 PM   9.0/ 9.5  -1.4/-0.9   0.6/ 1.1     2       None    
 30/04 AM  10.0/10.5  -0.3/ 0.2   0.8/ 1.3     3       None

Nantucket Harbor
MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/03 AM   4.9/ 5.4   1.3/ 1.8   1.0/ 1.5     5      Minor    
 28/04 PM   4.0/ 4.5   0.4/ 0.9   0.8/ 1.3    3-4      None    
 29/04 AM   4.2/ 4.7   0.7/ 1.1   0.4/ 0.9     2       None    
 29/05 PM   3.6/ 4.1   0.0/ 0.5   0.4/ 0.9     3       None    
 30/05 AM   4.4/ 4.9   0.8/ 1.3   0.6/ 1.1    3-4      None

&&

$$
1 follow-up statement
055 
WHUS41 KBOX 280132
CFWBOX

Coastal Hazard Message
National Weather Service Boston/Norton MA
932 PM EDT Mon Apr 27 2020

MAZ022-024-280945-
/O.CON.KBOX.CF.S.0004.200428T0600Z-200428T1000Z/
Barnstable MA-Nantucket MA-
932 PM EDT Mon Apr 27 2020

* WHAT...Up to one half foot of inundation above ground level 
  expected in low-lying areas near shorelines and tidal 
  waterways (3.0 to 12.0 feet Mean Lower Low Water).

* WHERE...Barnstable MA and Nantucket MA Counties.

* WHEN...From 2 AM EDT Tuesday through late tonight.

* IMPACTS...Some splashover and perhaps very minor coastal 
  flooding on Easy Street in Nantucket within an hour or so
  of high tide.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

&&

Time of high total tides are approximate to the nearest hour.

Wings Neck
MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft
MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/12 AM   4.4/ 4.9   0.0/ 0.5   0.5/ 1.0     1       None    
 28/12 PM   4.0/ 4.5  -0.5/ 0.0   0.8/ 1.3     1       None    
 29/01 AM   4.0/ 4.5  -0.3/ 0.2   0.2/ 0.8     1       None    
 29/02 PM   3.6/ 4.1  -0.9/-0.4   0.2/ 0.8     1       None    
 30/02 AM   4.5/ 5.0   0.1/ 0.6   0.7/ 1.1     2       None    
 30/02 PM   4.4/ 4.9   0.0/ 0.5   1.0/ 1.5    3-4      None

Provincetown Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/03 AM  11.2/11.7   1.1/ 1.6   1.5/ 2.0     1       None    
 28/04 PM   9.6/10.1  -0.6/-0.1   0.9/ 1.4     1       None    
 29/04 AM  10.4/10.9   0.2/ 0.8   0.6/ 1.1     1       None    
 29/05 PM   9.3/ 9.8  -0.9/-0.4   0.6/ 1.1     3       None    
 30/05 AM  10.5/11.0   0.4/ 0.9   0.7/ 1.1    3-4      None

Chatham MA - East Coast
MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft
MHHW Categories - Minor 1.3 ft, Moderate 3.8 ft, Major 5.3 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/05 PM   5.7/ 6.2  -2.0/-1.6   1.7/ 2.2    10       None    
 28/04 AM   6.5/ 7.0  -1.3/-0.8   1.4/ 1.9   9-10      None    
 28/05 PM   5.0/ 5.5  -2.7/-2.2   0.9/ 1.4    6-7      None    
 29/05 AM   5.7/ 6.2  -2.0/-1.6   0.6/ 1.1    4-5      None    
 29/06 PM   4.7/ 5.2  -3.1/-2.6   0.6/ 1.1     4       None    
 30/06 AM   5.9/ 6.4  -1.9/-1.4   0.8/ 1.3    4-5      None

Buzzards Bay at Woods Hole
MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft
MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/12 AM   3.2/ 3.7   1.2/ 1.7   1.0/ 1.5     2       None    
 28/01 PM   2.7/ 3.2   0.8/ 1.3   1.0/ 1.5     1       None    
 29/01 AM   2.7/ 3.2   0.7/ 1.1   0.5/ 1.0     1       None    
 29/01 PM   2.2/ 2.7   0.2/ 0.8   0.5/ 1.0     1       None    
 30/02 AM   3.1/ 3.6   1.1/ 1.6   0.9/ 1.4     2       None    
 30/02 PM   3.0/ 3.5   1.0/ 1.5   1.1/ 1.6    3-4      None

Dennis - Sesuit Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/03 AM  12.1/12.6   1.6/ 2.0   2.0/ 2.5    3-4      None    
 28/04 PM  10.1/10.6  -0.5/ 0.0   1.1/ 1.6    1-3      None    
 29/04 AM  10.8/11.3   0.2/ 0.8   0.8/ 1.3     1       None    
 29/05 PM   9.6/10.1  -1.0/-0.5   0.7/ 1.1     2       None    
 30/05 AM  10.7/11.2   0.2/ 0.7   0.8/ 1.3     3       None

Chatham - South side
MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft
MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/05 PM   4.0/ 4.5  -0.6/-0.1   1.1/ 1.6     3       None    
 28/04 AM   4.7/ 5.2   0.2/ 0.7   1.0/ 1.5    2-3      None    
 28/05 PM   3.9/ 4.4  -0.7/-0.2   0.9/ 1.4    1-2      None    
 29/05 AM   4.4/ 4.9  -0.2/ 0.3   0.6/ 1.1     1       None    
 29/06 PM   3.7/ 4.2  -0.9/-0.4   0.7/ 1.1    2-3      None    
 30/06 AM   4.7/ 5.2   0.2/ 0.8   1.0/ 1.5    3-4      None

Sandwich Harbor
MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 28/03 AM  10.3/10.8   0.0/ 0.5   1.8/ 2.2    7-8      None    
 28/04 PM   8.4/ 8.9  -2.0/-1.5   0.9/ 1.4    3-4      None    
 29/04 AM   9.0/ 9.5  -1.4/-0.9   0.6/ 1.1     1       None    
 29/05 PM   8.1/ 8.6  -2.2/-1.8   0.7/ 1.1    2-3      None    
 30/05 AM   9.2/ 9.7  -1.1/-0.7   0.8/ 1.3    3-4      None

Nantucket Harbor
MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 27/05 PM   3.5/ 4.0  -0.2/ 0.3   1.1/ 1.6     5       None    
 28/04 AM   4.2/ 4.7   0.7/ 1.1   1.1/ 1.6     5       None    
 28/05 PM   3.2/ 3.7  -0.3/ 0.2   0.8/ 1.3    3-4      None    
 29/05 AM   3.7/ 4.2   0.1/ 0.6   0.5/ 1.0     2       None    
 29/06 PM   3.0/ 3.5  -0.7/-0.2   0.5/ 1.0     3       None    
 30/06 AM   3.9/ 4.4   0.2/ 0.8   0.7/ 1.1    3-4      None

&&

$$

What forecasters said that day

The local office's own words before this coastal flood 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 coastal flood statement went out at Apr 27, 4:16 PM EDT, 13 minutes earlier.

Area forecast discussion, Apr 27, 4:16 PM EDT, 13 minutes before
Area Forecast Discussion
National Weather Service Boston/Norton MA
416 PM EDT Mon Apr 27 2020

.SYNOPSIS...
Low pressure east of Cape Cod slowly moves seaward tonight but
remaining unseasonably cool, brisk with rain showers possibly
changing over to snow showers overnight. Dry weather finally returns
Tuesday along with moderating temperatures. Dry weather continues
Wednesday as high pressure builds into the area. The next big storm
arrives later Thursday into early Friday with heavy rain and strong
winds. As this storm exits later Friday dry weather returns for the
weekend along with temperatures at or warmer than normal!

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...

140PM Update...

** Near daily record cool max temperatures possible for parts of
 our area today **

Forecast remains on track for an anomalously cold late April
day. A band of rain showers has set up roughly along the I-95
corridor from just north of Boston towards Providence. This
coincides with 925 mb wind speed and directional convergence as
well as slight upslope enhancement. With the surface low
pressure barely moving, northeast flow continues but as the nose
of the low level jet lifts a little offshore, expect the winds
to change to more of NNE or N and diminish somewhat. With a
surface high pressure over Quebec, this will lead to colder air
being advected into the region. As temperatures start falling
later this afternoon, rain is expected to mix with or change to
snow across higher terrain, mainly over 1000 ft.

Previous Discussion...

1030AM...Overall, a damp, cold and dreary day is in store for
most of us in Southern New England. A persistent low-level
northeast flow is in store for us due to a meandering surface
low just southeast of Nantucket, which is in no rush to leave
thanks to a upper level blocking pattern over northern Quebec as
favored by a negative NAO regime. In addition, surface high
pressure over Quebec is also helping to spill even colder air
into New England. There is good cyclonic curvature with a
vertically stacked low near the 70W/40N benchmark from the
surface up to about 700mb. With NAM Nest Bufkit soundings
showing mixing deepening to around 850mb, some of the stronger
winds aloft could mix down to the surface. As a result, expect
the strongest winds near the eastern MA coast, especially from
Boston point north. Northeast winds could gust over 40 mph at
times near the coast. Further inland, winds will be more from
the north and less gusty than at the coast.

Per SPC mesoanalysis, there is an area of 925mb frontogenesis in the
vicinity of the MA north shore, which is consistent with the
approximate location of a rather sharp near-surface frontal
boundary, with 850mb temperatures ranging from -4C over Fitchburg,
MA to +5C over Provincetown, MA just 100 miles away. This is the
area of best lift for our area, but because of its rather shallow
nature, only anticipating mainly drizzle or showers with steadier
precipitation over Central ME and NH.

Finally, as colder air works its way into our area this afternoon,
locations in higher elevation (generally 1000 ft and above) could
see snow mixing in with the rain showers or drizzle. NAM Nest
Bukfit soundings show a deeper saturation to about 650-750mb
this afternoon so we could see steadier showers across the
region, mostly for the eastern half of Southern New England.
Because temperatures stay above freezing and given warm road
surfaces and generally light precipitation intensity, not
expecting any accumulations other than coating to a few tenths
of an inch on grassy surfaces. Overall, a raw late April day
with perhaps some decorative flakes over the higher terrain for
today.

&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/...

Tonight...

As the low shifts S of Nova Scotia, will see colder air filter
in across the region with a mix of rain/snow showers shifting S
across most areas through most of the night. Temps will remain
marginal across the coastal plain, except for on grassy and
untreated surfaces, but could see light accumulations across the
higher terrain areas. However, with the low exiting, back edge
of the precip should push in through the night. The precip may
linger across N central and eastern areas into the Tuesday
morning commute.

N winds will diminish away from E coastal areas, but could still
see wind gusts up to 25-35 kt along the immediate E coast,
especially across Cape Cod and the islands. Temps will bottom
out in the lower 30s across the higher terrain, ranging to the
mid and upper 30s across the coastal plain.

Tuesday...

The back edge of the large cyclonic flow will keep some
spotty rain and/or snow showers across central and eastern areas
through around mid morning, then should push far enough offshore
to bring drier conditions. Clearing skies will push into
western areas by midday, with the improvement shifting E through
the afternoon but may linger through the day along the E coast.

Expect N-NW winds to remain gusty along E coastal areas, upward
to around 25 kt or so through midday, then should diminish.

Expect high temps to recover to the 50s across most areas, but
will remain cooler along the E coast with readings only reaching
the mid-upper 40s.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...

415 pm update ...

Highlights ...

* Dry weather Wednesday
* Heavy rain & strong winds Thu into Fri
* Drier and warmer this weekend

Wednesday ...

Short wave ridging provides dry weather along with near seasonable
temperatures. Model soundings suggest mixing to about 850 mb or so
and with temps around zero at the top of the blyr, this should
support highs of 55-60 inland.  Given light winds and sunshine
(especially in the morning) it will feel even milder. Cooler closer
to the coast with afternoon seabreezes. Looks like morning sunshine
will give way to increasing afternoon clouds as warm front
approaches from the west. Longest duration of sunshine should be
over eastern MA and RI. Low risk for some light rain/sprinkles late
in the day western MA/CT in response to WAA. Otherwise dry weather
prevails.

Thursday/Friday ...

Full latitude trough impacts the east coast with PWATs +2 to +3
standard deviations as GOM and Atlantic moisture stream northward
into New England. Wind anomalies more impressive with southerly low
level jet +4 standard deviations. Thus strong jet dynamics acting on
copious deep layer moisture will result in periods of heavy rain and
strong to perhaps damaging winds Thu into Fri. Preliminary rainfall
expected 1-2 inches with possibly up to 3 inches given upslope
southerly component and if and where convective elements develop. As
for flood potential, given a few days of dry weather (Tue & Wed)
leading up to this event combined with Thu/Fri system fairly
progressive, this should preclude significant flooding with worst
case scenario to be minor poor drainage flooding along with rivers
and streams.  As for temps, given strong low level WAA temps Thu
should be in the 50s, then rise Thu night with 60s possible Fri
after the rain moves offshore.

Weekend ...

Showers possible Saturday depending how progressive mid/upper trough
becomes, otherwise trend should be for dry and warmer weather as
deep trough ejects into the Maritimes. Low risk for scattered
showers late Sun ahead of a cold front. Overall many hours of dry
weather this weekend with highs in the 60s Saturday, 65-70 Sunday.

&&

.AVIATION /20Z MONDAY THROUGH SATURDAY/...
1730Z Update...

Forecaster Confidence Levels...

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

This afternoon...Moderate confidence.

Areas of MVFR-IFR conditions lingering in areas of rain and/or
snow showers with patchy fog. Lowest conditions expected along
coastal terminals, especially along the E coast through most of
the day with LIFR CIGS at times.

N-NE winds around 10-15 kt away from the coast, up to 15-25
gusting to around 30-35 kt along the E coast.

Tonight...Moderate confidence.

Areas of MVFR-IFR CIGS/VSBYS lingering across most areas with
scattered -RASH/-SNSH. Lowest conditions across E coastal areas
through around midnight. Conditions should slowly improve to
VFR across central and western areas after 08Z or so. VSBYS
improving to VFR toward daybreak across most areas.

Winds back to N-NW 10-15 kt across most areas, except up to
20-25 kt gusting to around 30 kt along E coastal areas.

Tuesday...Moderate to high confidence.

Any leftover MVFR CIGS across most areas should improve to VFR
by around midday. Leftover scattered -RASH should taper off by
mid to late morning. N-NW winds 5-10 kt inland, up to around 15
kt across Cape Cod and the islands. Good visibility.

KBOS Terminal...Moderate confidence in the TAF.

KBDL Terminal...Moderate confidence in the TAF.

Outlook /Wednesday through Saturday/...

415 pm update ...

Wednesday: Mainly VFR, with local MVFR possible. Slight chance
SHRA.

Wednesday Night: Mainly MVFR, with areas VFR possible. Breezy.
Chance SHRA.

Thursday: Mainly MVFR, with local IFR possible. Windy with
areas of gusts up to 30 kt. SHRA likely.

Thursday Night: Mainly MVFR, with local IFR possible. Windy
with gusts up to 30 kt. SHRA.

Friday: Mainly MVFR, with local IFR possible. Windy with local
gusts up to 30 kt. Chance SHRA.

Friday Night through Saturday: Mainly MVFR, with areas VFR
possible. Breezy. Chance SHRA.

&&

.MARINE...
1730Z Update...

Gale warnings remain in effect for most open waters and Boston
Harbor, and Small Craft Advisories along the southern near shore
waters and Narragansett Bay.

This afternoon...

Expect N-NE winds at 15-25 kt gusting to 30-35 kt, except 25-35
kt gusting to around 40 kt across the eastern waters generally
N of Cape Cod. Expect winds and gusts to continue through most
of the day, especially near and E of Cape Ann. Seas up to 10 to
13 feet on the eastern waters and 4 to 7 ft from E of Cape Cod
and across the southern waters. Winds and seas slowly diminish
during the afternoon. Visibility around 3 nm except below 1 nm
across portions of Cape Cod and especially near Nantucket,
otherwise 3-5 nm across the remaining waters.

Tonight...

N-NW winds 15-30 kt gusting to 35 kt across the open waters
through most of the night, then slowly diminish, Seas up to 8 to
12 ft on the eastern waters and 5 to 8 ft on the southern
waters, slowly subsiding overnight but remaining well above 5
ft. Visibility 1-3 nm across the eastern waters through improve
to 3-5 nm by around 06Z, and over 6 nm on the southern waters.

Tuesday...

N-NW winds 15-25 kt gusting to around 30 kt early, diminishing
10-15 kt by around midday or early afternoon. Seas generally 5
to 10 feet, highest across the eastern waters continuing to
slowly subside through the day but remaining at or above 5 feet
on the eastern waters. Good visibility.

Outlook /Wednesday through Saturday/...

415 pm update ...

Wednesday: Winds less than 25 kt. Areas of seas approaching
5 ft.

Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain
showers.

Thursday: Low risk for Small Craft Advisory winds with gusts up
to 30 kt. Rough seas up to 9 ft. Chance of rain showers.

Thursday Night: Low risk for gale force winds with gusts up to
35 kt. Rough seas up to 13 ft. Rain showers.

Friday: Moderate risk for Small Craft Advisory winds with gusts
up to 30 kt. Rough seas up to 13 ft. Chance of rain showers.

Friday Night: Winds less than 25 kt. Rough seas up to 11 ft.
Chance of rain showers.

Saturday: Winds less than 25 kt. Rough seas up to 9 ft. Chance
of rain showers.

&&

.TIDES/COASTAL FLOODING...

415 pm update ...

Persist NNE gales may yield a 1.25-1.50 storm surge with tonight's
high tide cycle. This may result in very minor/nuisance coastal
flooding at Nantucket and across Cape Cod.  ESTOFS and ETSS were
running too low given current observations so followed the Stevens
Institute ensemble surge guidance.  Time of high tide around 3 am,
so risk for minor/spotty flooding from about 1 am to 5 am.

&&

.CLIMATE...
Temperatures today will feel more like early March rather than
late April. Expect the highs across the region to run from 15 to
around 20 degrees below seasonal normals. Record low maximum
temperature records will be challenged.

Here are the record low max temperatures for today, April 27 for
our four long term climate sites...

Boston: 41F set in 1882
Hartford/Bradley: 46F set in 1917
Providence: 44F set in 1917
Worcester: 41F set in 1973

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Gale Warning until 6 AM EDT Tuesday for ANZ231-232-250-251-
     254>256.
     Small Craft Advisory until 8 PM EDT Tuesday for ANZ233>237.
     Gale Warning until 10 PM EDT this evening for ANZ230.

&&

SYNOPSIS...Nocera
NEAR TERM...Chai
SHORT TERM...EVT
LONG TERM...Nocera
AVIATION...Nocera/Chai
MARINE...Nocera/Chai
TIDES/COASTAL FLOODING...Nocera
CLIMATE...Staff
Hazardous weather outlook, Apr 27, 4:26 PM EDT, 3 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
426 PM EDT Mon Apr 27 2020

CTZ002>004-MAZ002>024-026-RIZ001>008-282030-
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-
426 PM EDT Mon Apr 27 2020

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ231-232-250-251-254>256-282030-
Cape Cod Bay-Nantucket 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 PM EDT Mon Apr 27 2020

...GALE WARNING IN EFFECT UNTIL 6 AM EDT TUESDAY...

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

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ233>237-282030-
Vineyard Sound-Buzzards Bay-Rhode Island Sound-Narragansett Bay-
Block Island Sound-
426 PM EDT Mon Apr 27 2020

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230-282030-
Boston Harbor-
426 PM EDT Mon Apr 27 2020

...GALE WARNING IN EFFECT UNTIL 10 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For more information on upcoming hazardous weather, please see the
Area Forecast Discussion on our webpage for the latest forecast
thinking. There is also our Enhanced Hazardous Weather Outlook at
www.weather.gov/box/ehwo

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

You can follow us on Facebook at
www.facebook.com/us.nationalweatherservice.boston.gov

You can follow us on Twitter at
@NWSBoston

In the hours before

Local storm report, Apr 27, 2:21 PM EDT, 2 hours 8 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
221 PM EDT MON APR 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0422 AM     NON-TSTM WND DMG WEST NEWBURY            42.80N  70.99W
04/27/2020                   ESSEX              MA   AMATEUR RADIO

            TREE DOWN ON BRIDGE STREET, BLOCKING MOST OF THE ROAD.

0534 AM     NON-TSTM WND DMG GEORGETOWN              42.73N  70.98W
04/27/2020                   ESSEX              MA   AMATEUR RADIO

            TREE AND WIRES DOWN ON TRESTLE WAY.

0617 AM     NON-TSTM WND DMG NORTON                  41.97N  71.18W
04/27/2020                   BRISTOL            MA   AMATEUR RADIO

            LARGE BRANCH DOWN ON BAY ROAD, NEAR THE CHATEAU,
            CLEARED BY LOCAL POLICE.

0632 AM     NON-TSTM WND DMG CAMBRIDGE               42.38N  71.12W
04/27/2020                   MIDDLESEX          MA   AMATEUR RADIO

            LARGE TREE BRANCH DOWN, BLOCKING SIDEWALK ON TROWBRIDGE
            STREET.

0725 AM     NON-TSTM WND DMG BEVERLY                 42.56N  70.84W
04/27/2020                   ESSEX              MA   AMATEUR RADIO

            LARGE TREE DOWN, BLOCKING WINTHROP AVENUE.

0845 AM     NON-TSTM WND DMG PEABODY                 42.53N  70.97W
04/27/2020                   ESSEX              MA   AMATEUR RADIO

            TREE DOWN ON WIRES ON CRANE AVENUE.

0933 AM     NON-TSTM WND DMG MILTON                  42.24N  71.08W
04/27/2020                   NORFOLK            MA   AMATEUR RADIO

            LARGE TREE DOWN ON CANTON AVENUE, BLOCKING THE
            SIDEWALK.

1120 AM     NON-TSTM WND DMG NORWELL                 42.17N  70.78W
04/27/2020                   PLYMOUTH           MA   AMATEUR RADIO

            TREE DOWN AT PARKER AND MAIN STREET.

&&

EVENT NUMBER BOX2001373 BOX2001372 BOX2001371 BOX2001370 BOX2001369
BOX2001368 BOX2001367 BOX2001366

Gaucher

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 4:02 AM EDTGale WarningBOX27 hr

Nearby

Coastal Flood Statements in Massachusetts, 2020Every coastal flood statement in 2020

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.