Alert archive / Massachusetts / Coastal Flood Statements in 2021

Coastal Flood Statement 3, NWS Boston/Norton, MA

March 1, 20215 counties in Massachusetts

NWS Boston/Norton, MA issued this coastal flood statement at Mar 1, 2021, 8:38 AM EST for 5 counties in Massachusetts. It took effect at Mar 1, 2021, 11:00 AM EST. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Mar 1, 2021, 8:38 AM EST (13:38 UTC)
In effect from
Mar 1, 2021, 11:00 AM EST
Expired
Mar 1, 2021, 2:00 PM EST
In force
3 hr
Issued by
NWS Boston/Norton, MA

Counties Barnstable County, MA, Essex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 35 km from the middle of the area, began a volume at 13:40 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, 1.6 hours before the alert went out and 90 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 2021-03-01Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 2021-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 316 square meters per square second.1939587897117Sfc1 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
498 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
316 m²/s²
0-3 km storm-relative helicity
299 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

905 
WHUS41 KBOX 011338
CFWBOX

Coastal Hazard Message
National Weather Service Boston/Norton MA
838 AM EST Mon Mar 1 2021

MAZ007-015-016-019-022-011900-
/O.NEW.KBOX.CF.S.0003.210301T1600Z-210301T1900Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Eastern Plymouth MA-Barnstable MA-
838 AM EST Mon Mar 1 2021

* WHAT...Up to one half foot of inundation above ground level 
  expected in low-lying areas near shorelines and tidal 
  waterways (3.3 to 12.6 feet Mean Lower Low Water).

* WHERE...Eastern Massachusetts Coast including bay side
  of Cape Cod.

* WHEN...11 AM until 2 PM EST this afternoon.

* IMPACTS...Shallow ponding of water on vulnerable coastal roads
  around the time of high tide. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

&&

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

Merrimack River near Newburyport MA
MLLW Categories - Minor 11.0 ft, Moderate 12.0 ft, Major 13.5 ft
MHHW Categories - Minor 1.5 ft, Moderate 2.5 ft, Major 4.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM   9.9/10.4   0.4/ 0.9   0.7/ 1.1     1       None    
 02/01 AM   8.5/ 9.0  -1.1/-0.6  -0.7/-0.2     1       None    
 02/02 PM   8.3/ 8.8  -1.3/-0.8  -0.9/-0.4     1       None    
 03/02 AM   8.9/ 9.4  -0.7/-0.2  -0.5/ 0.0     1       None

Gloucester Harbor
MLLW Categories - Minor 11.5 ft, Moderate 13.0 ft, Major 15.0 ft
MHHW Categories - Minor 2.0 ft, Moderate 3.5 ft, Major 5.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  11.4/11.9   1.9/ 2.3   0.8/ 1.3    4-5     Minor    
 02/01 AM   9.8/10.3   0.2/ 0.8  -0.6/-0.1    5-6      None    
 02/01 PM   9.6/10.1   0.1/ 0.6  -0.9/-0.4    5-6      None    
 03/02 AM  10.0/10.5   0.5/ 1.0  -0.5/ 0.0    2-3      None

Revere
MLLW Categories - Minor 12.5 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.6 ft, Moderate 4.6 ft, Major 6.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  12.0/12.5   2.1/ 2.6   0.8/ 1.3    1-2      None    
 02/01 AM  10.2/10.7   0.2/ 0.8  -0.7/-0.2     2       None    
 02/01 PM  10.1/10.6   0.2/ 0.7  -0.9/-0.4     2       None    
 03/02 AM  10.5/11.0   0.6/ 1.1  -0.5/ 0.0     1       None

Boston Harbor
MLLW Categories - Minor 12.5 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.4 ft, Moderate 4.4 ft, Major 5.9 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  11.8/12.3   1.7/ 2.2   0.7/ 1.1    1-2      None    
 02/01 AM  10.2/10.7   0.1/ 0.6  -0.7/-0.2     2       None    
 02/01 PM  10.1/10.6   0.0/ 0.5  -0.9/-0.4     2       None    
 03/02 AM  10.5/11.0   0.4/ 0.9  -0.5/ 0.0     1       None

Scituate MA
MLLW Categories - Minor 11.5 ft, Moderate 13.5 ft, Major 15.5 ft
MHHW Categories - Minor 1.8 ft, Moderate 3.8 ft, Major 5.8 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  11.3/11.8   1.6/ 2.0   0.8/ 1.3     3      Minor    
 02/01 AM  10.0/10.5   0.2/ 0.8  -0.3/ 0.2    5-6      None    
 02/01 PM   9.7/10.2   0.0/ 0.5  -0.8/-0.2    5-6      None    
 03/02 AM  10.2/10.7   0.5/ 1.0  -0.3/ 0.2     2       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 
 --------  ---------  ---------  ---------  -------  --------

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 
 --------  ---------  ---------  ---------  -------  --------
 01/09 AM   5.4/ 5.9   1.0/ 1.5   0.9/ 1.4     1       None    
 01/10 PM   5.1/ 5.6   0.7/ 1.1   0.4/ 0.9     3       None    
 02/10 AM   3.7/ 4.2  -0.8/-0.2  -0.7/-0.2     3       None    
 02/11 PM   4.2/ 4.7  -0.2/ 0.3  -0.5/ 0.0     2       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 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  12.0/12.5   1.9/ 2.3   0.9/ 1.4    1-2      None    
 02/01 AM  10.9/11.4   0.8/ 1.3   0.0/ 0.5     3       None    
 02/02 PM  10.3/10.8   0.2/ 0.7  -0.7/-0.2     3       None    
 03/02 AM  10.8/11.3   0.7/ 1.1  -0.2/ 0.2    3-4      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 
 --------  ---------  ---------  ---------  -------  --------
 01/10 AM   3.5/ 4.0   1.5/ 2.0   1.0/ 1.5    1-2      None    
 01/10 PM   2.7/ 3.2   0.8/ 1.3   0.1/ 0.6     3       None    
 02/10 AM   2.0/ 2.5   0.0/ 0.5  -0.6/-0.1    3-4      None    
 02/11 PM   2.2/ 2.7   0.2/ 0.8  -0.5/ 0.0    2-3      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 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  12.4/12.9   1.9/ 2.3   1.0/ 1.5    1-2      None    
 02/01 AM  11.6/12.1   1.1/ 1.6   0.4/ 0.9    4-5      None    
 02/02 PM  10.8/11.3   0.2/ 0.8  -0.5/ 0.0     5       None    
 03/02 AM  11.4/11.9   0.9/ 1.4   0.0/ 0.5    2-3      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 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM   6.2/ 6.7  -1.6/-1.1   0.9/ 1.4     4       None    
 02/02 AM   4.9/ 5.4  -2.8/-2.3  -0.3/ 0.2    5-6      None    
 02/02 PM   4.5/ 5.0  -3.2/-2.7  -0.7/-0.2    6-7      None    
 03/03 AM   5.2/ 5.7  -2.6/-2.1  -0.2/ 0.3    4-5      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 
 --------  ---------  ---------  ---------  -------  --------
 01/01 PM  10.8/11.3   0.5/ 1.0   1.0/ 1.5    1-2      None    
 02/01 AM   9.6/10.1  -0.8/-0.2  -0.2/ 0.3    5-7      None    
 02/01 PM   9.0/ 9.5  -1.4/-0.9  -0.7/-0.2    6-7      None    
 03/02 AM   9.6/10.1  -0.8/-0.2  -0.2/ 0.2     3       None

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 1, 3:11 AM ESTStorm WarningBOX36 hr
Mar 1, 3:11 AM ESTWind Chill AdvisoryBOXFranklin, Hampden, Hampshire, Middlesex, Worcester30 hr

Nearby

Coastal Flood Statements in Massachusetts, 2021Every coastal flood statement in 2021

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.