Alert archive / Massachusetts / Coastal Flood Statements in 2021
Coastal Flood Statement 9, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this coastal flood statement at Oct 10, 2021, 2:55 AM EDT for 4 counties in Massachusetts. It took effect at Oct 10, 2021, 12:00 PM EDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Oct 10, 2021, 2:55 AM EDT (06:55 UTC)
- In effect from
- Oct 10, 2021, 12:00 PM EDT
- Expired
- Oct 10, 2021, 4:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Boston/Norton, MA
Counties Essex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 40 km from the middle of the area, began a volume at 06:55 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
Gray, ME (KGYX), launched 00:00Z, 6.9 hours before the alert went out and 187 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 693 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
948
WHUS41 KBOX 100655
CFWBOX
Coastal Hazard Message
National Weather Service Boston/Norton MA
255 AM EDT Sun Oct 10 2021
MAZ007-015-016-019-102000-
/O.NEW.KBOX.CF.S.0009.211010T1600Z-211010T2000Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Eastern Plymouth MA-
255 AM EDT Sun Oct 10 2021
...COASTAL FLOOD STATEMENT IN EFFECT FROM NOON EDT TODAY THROUGH
THIS AFTERNOON...
* WHAT...Up to one half foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways (10.2 to 12.1 feet Mean Lower Low Water).
* WHERE...Suffolk MA, Eastern Essex MA, Eastern Norfolk MA and
Eastern Plymouth MA Counties.
* WHEN...From noon EDT today through this afternoon.
* IMPACTS...Some water on low lying roads and property.
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
-------- --------- --------- --------- ------- --------
10/03 AM 8.8/ 9.3 -0.8/-0.2 0.0/ 0.5 2-3 None
10/03 PM 9.9/10.4 0.4/ 0.9 0.1/ 0.6 3 None
11/04 AM 8.6/ 9.1 -1.0/-0.5 0.2/ 0.7 2-3 None
11/04 PM 9.8/10.3 0.2/ 0.8 0.2/ 0.7 2 None
12/05 AM 8.3/ 8.8 -1.3/-0.8 0.2/ 0.7 2 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
-------- --------- --------- --------- ------- --------
10/03 AM 9.9/10.4 0.4/ 0.9 0.0/ 0.5 3 None
10/03 PM 11.0/11.5 1.5/ 2.0 0.1/ 0.6 3 None
11/03 AM 9.6/10.1 0.1/ 0.6 0.1/ 0.6 3 None
11/04 PM 10.7/11.2 1.2/ 1.7 0.2/ 0.7 3 None
12/04 AM 9.3/ 9.8 -0.2/ 0.2 0.2/ 0.7 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
-------- --------- --------- --------- ------- --------
10/03 AM 10.4/10.9 0.5/ 1.0 0.1/ 0.6 1 None
10/03 PM 11.5/12.0 1.6/ 2.0 0.1/ 0.6 1 None
11/03 AM 10.1/10.6 0.2/ 0.7 0.2/ 0.7 1 None
11/04 PM 11.4/11.9 1.5/ 2.0 0.2/ 0.8 1 None
12/04 AM 9.6/10.1 -0.3/ 0.2 0.2/ 0.7 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
-------- --------- --------- --------- ------- --------
10/03 AM 10.5/11.0 0.4/ 0.9 0.1/ 0.6 1-2 None
10/03 PM 11.6/12.1 1.5/ 2.0 0.2/ 0.7 2 None
11/03 AM 10.2/10.7 0.1/ 0.6 0.2/ 0.8 1-2 None
11/04 PM 11.3/11.8 1.2/ 1.7 0.2/ 0.8 1 None
12/04 AM 9.7/10.2 -0.5/ 0.0 0.2/ 0.8 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
-------- --------- --------- --------- ------- --------
10/03 AM 9.9/10.4 0.2/ 0.7 0.1/ 0.6 3 None
10/03 PM 11.1/11.6 1.4/ 1.9 0.2/ 0.7 3 Minor
11/03 AM 9.8/10.3 0.1/ 0.6 0.2/ 0.8 2-3 None
11/04 PM 11.0/11.5 1.3/ 1.8 0.2/ 0.8 2 None
12/04 AM 9.4/ 9.9 -0.3/ 0.2 0.2/ 0.8 2 None
&&
$$1 follow-up statement
976
WHUS41 KBOX 101520
CFWBOX
Coastal Hazard Message
National Weather Service Boston/Norton MA
1120 AM EDT Sun Oct 10 2021
MAZ007-015-016-019-102000-
/O.CON.KBOX.CF.S.0009.211010T1600Z-211010T2000Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Eastern Plymouth MA-
1120 AM EDT Sun Oct 10 2021
...COASTAL FLOOD STATEMENT REMAINS IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...
* WHAT...Up to one half foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways (10.2 to 12.1 feet Mean Lower Low Water).
* WHERE...Suffolk MA, Eastern Essex MA, Eastern Norfolk MA and
Eastern Plymouth MA Counties.
* WHEN...Until 4 PM EDT this afternoon.
* IMPACTS...Some water on low lying roads and property.
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
-------- --------- --------- --------- ------- --------
10/03 PM 10.0/10.5 0.5/ 1.0 0.2/ 0.7 1 None
11/04 AM 8.8/ 9.3 -0.8/-0.2 0.4/ 0.9 1 None
11/04 PM 10.0/10.5 0.5/ 1.0 0.4/ 0.9 1 None
12/05 AM 8.4/ 8.9 -1.1/-0.7 0.2/ 0.8 1 None
12/05 PM 9.6/10.1 0.1/ 0.6 0.2/ 0.8 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
-------- --------- --------- --------- ------- --------
10/03 PM 11.1/11.6 1.6/ 2.0 0.2/ 0.7 3 Minor
11/03 AM 9.9/10.4 0.4/ 0.9 0.4/ 0.9 3 None
11/04 PM 10.9/11.4 1.4/ 1.9 0.4/ 0.9 3 None
12/04 AM 9.5/10.0 0.0/ 0.5 0.4/ 0.9 3 None
12/05 PM 10.3/10.8 0.8/ 1.3 0.2/ 0.7 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
-------- --------- --------- --------- ------- --------
10/03 PM 11.9/12.4 2.0/ 2.5 0.5/ 1.0 1 None
11/03 AM 10.6/11.1 0.7/ 1.1 0.7/ 1.1 1 None
11/04 PM 11.8/12.3 1.9/ 2.3 0.7/ 1.1 1 None
12/04 AM 10.1/10.6 0.2/ 0.7 0.7/ 1.1 1 None
12/05 PM 11.1/11.6 1.2/ 1.7 0.5/ 1.0 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
-------- --------- --------- --------- ------- --------
10/03 PM 11.9/12.4 1.8/ 2.2 0.5/ 1.0 2 None
11/03 AM 10.6/11.1 0.5/ 1.0 0.7/ 1.1 2 None
11/04 PM 11.7/12.2 1.6/ 2.0 0.7/ 1.1 2 None
12/04 AM 10.1/10.6 0.0/ 0.5 0.7/ 1.1 1 None
12/05 PM 11.1/11.6 1.0/ 1.5 0.5/ 1.0 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
-------- --------- --------- --------- ------- --------
10/03 PM 11.3/11.8 1.6/ 2.0 0.4/ 0.9 3 Minor
11/03 AM 10.0/10.5 0.2/ 0.8 0.5/ 1.0 3 None
11/04 PM 11.2/11.7 1.5/ 2.0 0.5/ 1.0 3 Minor
12/04 AM 9.6/10.1 -0.2/ 0.3 0.5/ 1.0 2-3 None
12/05 PM 10.6/11.1 0.9/ 1.4 0.2/ 0.8 2 None
&&
$$The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 3:21 PM EDT | Small Craft Advisory | BOX | 43 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.