Flood advisory in the United States
A coastal flood advisory is issued by the National Weather Service of the United States when coastal flooding along the coast of the Atlantic Ocean, Pacific Ocean, Arctic Ocean, or the Gulf of Mexico is occurring or imminent, but does not pose a serious threat to lives or property, but rather will simply pose a nuisance to people in the affected area. The flooding must be due to water being forced from the nearby body of water onto land, and not from rainfall. Nor'easters, hurricanes, tropical storms, and thunderstorms can all lead to the issuance of a coastal flood advisory.[1]
Example
The following is an example of a coastal flood advisory issued by the National Weather Service office in Taunton, Massachusetts.[2]
062
WHUS41 KBOX 030838
CFWBOX
Coastal Hazard Message
National Weather Service Boston/Norton MA
338 AM EST Mon Jan 3 2022
MAZ007-015-016-019-022>024-031900-
/O.CAN.KBOX.CF.S.0001.220103T1400Z-220103T1900Z/
/O.NEW.KBOX.CF.Y.0001.220103T1400Z-220103T1900Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Eastern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA-
338 AM EST Mon Jan 3 2022
...COASTAL FLOOD ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO
2 PM EST THIS AFTERNOON...
* WHAT...One to two feet of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways (3.3 to 13.0 feet Mean Lower Low Water).
* WHERE...Eastern Essex MA, Suffolk MA, Eastern Norfolk MA,
Eastern Plymouth MA, Barnstable MA, Dukes MA and Nantucket MA
Counties.
* WHEN...From 9 AM this morning to 2 PM EST this afternoon.
* IMPACTS...Coastal flooding is expected along the North Shore
from Marblehead northward along the coast to Newburyport. The
combination of high tides and a modest storm surge will result in
flooding of some immediate coastal roads and some road
closures are anticipated. Minor coastal flooding begins on
Easy Street in Nantucket. Minor coastal flooding occurs along
Morrissey Boulevard in Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.
&&
&&
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
-------- --------- --------- --------- ------- --------
03/11 AM 11.0/11.5 1.5/ 2.0 1.0/ 1.5 1 Minor
04/12 AM 9.4/ 9.9 -0.2/ 0.3 1.2/ 1.7 1 None
04/12 PM 10.7/11.2 1.2/ 1.7 0.8/ 1.3 1 Minor
05/01 AM 8.5/ 9.0 -1.1/-0.6 0.2/ 0.7 3 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
-------- --------- --------- --------- ------- --------
03/11 AM 12.3/12.8 2.7/ 3.2 1.0/ 1.5 3-5 Minor
04/12 AM 10.7/11.2 1.2/ 1.7 1.2/ 1.7 6-7 None
04/12 PM 11.9/12.4 2.3/ 2.8 0.7/ 1.1 4 Minor
05/01 AM 9.8/10.3 0.2/ 0.8 0.2/ 0.7 3-4 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
-------- --------- --------- --------- ------- --------
03/11 AM 13.0/13.5 3.1/ 3.6 1.2/ 1.7 1 Minor
04/12 AM 11.3/11.8 1.4/ 1.9 1.3/ 1.8 1 None
04/12 PM 12.7/13.2 2.7/ 3.2 0.9/ 1.4 1 Minor
05/01 AM 10.3/10.8 0.4/ 0.9 0.2/ 0.8 2 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
-------- --------- --------- --------- ------- --------
03/11 AM 13.0/13.5 2.8/ 3.4 1.2/ 1.7 2-4 Minor
04/12 AM 11.2/11.7 1.1/ 1.6 1.2/ 1.7 4 None
04/12 PM 12.6/13.1 2.5/ 3.0 0.9/ 1.4 3 Minor
05/01 AM 10.4/10.9 0.2/ 0.8 0.4/ 0.9 2 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
-------- --------- --------- --------- ------- --------
03/11 AM 12.5/13.0 2.7/ 3.2 1.1/ 1.6 3-5 Minor
04/12 AM 10.8/11.3 1.1/ 1.6 1.3/ 1.8 6-7 None
04/12 PM 12.1/12.6 2.3/ 2.8 0.8/ 1.3 4 Minor
05/01 AM 9.9/10.4 0.2/ 0.7 0.2/ 0.8 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
-------- --------- --------- --------- ------- --------
03/12 PM 6.2/ 6.7 1.7/ 2.2 1.1/ 1.6 4 None
04/01 AM 4.9/ 5.4 0.4/ 0.9 1.2/ 1.7 6-7 None
04/01 PM 5.9/ 6.4 1.4/ 1.9 0.9/ 1.4 3-4 None
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
-------- --------- --------- --------- ------- --------
03/08 AM 5.9/ 6.4 1.5/ 2.0 0.8/ 1.3 1-2 None
03/08 PM 4.7/ 5.2 0.4/ 0.9 0.6/ 1.1 4-5 None
04/09 AM 5.7/ 6.2 1.4/ 1.9 0.8/ 1.3 2-3 None
04/09 PM 4.9/ 5.4 0.5/ 1.0 0.6/ 1.1 1 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
-------- --------- --------- --------- ------- --------
03/11 AM 12.6/13.1 2.5/ 3.0 1.0/ 1.5 4 Minor
04/12 AM 11.0/11.5 0.9/ 1.4 1.2/ 1.7 7 None
04/12 PM 12.1/12.6 2.0/ 2.5 0.6/ 1.1 4-5 None
05/01 AM 10.1/10.6 0.0/ 0.5 0.2/ 0.7 3 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
-------- --------- --------- --------- ------- --------
03/08 AM 3.9/ 4.4 1.9/ 2.3 0.8/ 1.3 2 None
03/09 PM 3.5/ 4.0 1.5/ 2.0 1.0/ 1.5 5 None
04/09 AM 3.7/ 4.2 1.8/ 2.2 0.8/ 1.3 2-3 None
04/10 PM 3.0/ 3.5 1.0/ 1.5 0.6/ 1.1 1 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
-------- --------- --------- --------- ------- --------
03/11 AM 13.4/13.9 2.8/ 3.4 1.2/ 1.7 3 Minor
04/12 AM 11.9/12.4 1.4/ 1.9 1.5/ 2.0 6 None
04/12 PM 12.8/13.3 2.2/ 2.7 0.7/ 1.1 3-4 Minor
05/01 AM 10.7/11.2 0.2/ 0.7 0.2/ 0.8 1-2 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
-------- --------- --------- --------- ------- --------
03/12 PM 7.1/ 7.6 -0.7/-0.2 1.2/ 1.7 5 None
04/01 AM 6.0/ 6.5 -1.8/-1.3 1.4/ 1.9 7-8 None
04/01 PM 6.7/ 7.2 -1.1/-0.6 0.8/ 1.3 5-6 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
-------- --------- --------- --------- ------- --------
03/11 AM 11.9/12.4 1.6/ 2.0 1.2/ 1.7 3-4 Minor
04/12 AM 10.4/10.9 0.1/ 0.6 1.4/ 1.9 6-7 None
04/12 PM 11.3/11.8 1.0/ 1.5 0.7/ 1.1 3-4 None
05/01 AM 9.3/ 9.8 -1.1/-0.6 0.2/ 0.8 2 None
Vineyard Haven
MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.5 ft
MHHW Categories - Minor 3.0 ft, Moderate 4.5 ft, Major 6.5 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
03/12 PM 3.1/ 3.6 1.1/ 1.6 1.1/ 1.6 2-3 None
04/12 AM 3.2/ 3.7 1.2/ 1.7 1.5/ 2.0 4-5 None
04/12 PM 2.7/ 3.2 0.8/ 1.3 0.9/ 1.4 2 None
05/01 AM 2.1/ 2.6 0.1/ 0.6 0.4/ 0.9 1 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
-------- --------- --------- --------- ------- --------
03/12 PM 5.2/ 5.7 1.6/ 2.0 1.2/ 1.7 3-4 Minor
04/01 AM 4.5/ 5.0 0.9/ 1.4 1.6/ 2.0 5-7 None
04/01 PM 4.7/ 5.2 1.2/ 1.7 0.8/ 1.3 3-4 Minor
&&
$$
Nocera
See also
References
External links
