Coastal flood watch

A coastal flood watch 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 possible. 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 watch.{{cite web|title=Coastal Flood Watch|url=http://www.srh.noaa.gov/jetstream//append/glossary_c.htm#cfwatch|work=Glossary - JetStream - Online School for Weather|accessdate=17 May 2011|author=National Weather Service}}

Example

The following is an example of a coastal flood watch issued by the National Weather Service office in Norton, Massachusetts.{{cite web|title=Coastal Flood Watch|url=http://mesonet.agron.iastate.edu/vtec/2013-O-NEW-KBOX-CF-S-0001.html#2013-O-NEW-KBOX-CF-A-0001/DMX-N0Q-0|work=Iowa Environmental Mesonet NWS Product Archive|accessdate=17 May 2011|author=National Weather Service}}

462

WHUS41 KBOX 130725

CFWBOX

URGENT - IMMEDIATE BROADCAST REQUESTED

Coastal Hazard Message

National Weather Service Boston/Norton MA

325 AM EDT Mon Mar 13 2023

MAZ007-015-016-019-022-132030-

/O.NEW.KBOX.CF.A.0001.230315T0700Z-230315T1200Z/

Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-

Eastern Plymouth MA-Barnstable MA-

325 AM EDT Mon Mar 13 2023

...COASTAL FLOOD WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH

WEDNESDAY MORNING...

WHAT...Up to one foot of inundation above ground level

possible in low-lying areas near shorelines and tidal

waterways (2.1 to 12.9 feet Mean Lower Low Water).

WHERE...Eastern Massachusetts coast from the Merrimack River

to Cape Cod.

WHEN...From late Tuesday night through Wednesday morning.
IMPACTS...Flooding is up to one foot deep and affects more

vulnerable shore roads, including Morrissey Boulevard in Boston.

ADDITIONAL DETAILS...Large waves may produce pockets of moderate

flooding along the ocean shoreline in places such as Gloucester,

Revere, Hull, and Scituate. Flooding could be 1 to 2 feet deep in

some locations and debris could wash onto coastal roadways.

Significant beach erosion is also possible.

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.

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

-------- --------- --------- --------- ------- --------

13/04 AM 10.2/10.7 0.7/ 1.1 0.8/ 1.3 6 None

13/04 PM 8.9/ 9.4 -0.7/-0.2 0.6/ 1.1 5-6 None

14/05 AM 10.4/10.9 0.9/ 1.4 1.1/ 1.6 6-8 None

14/05 PM 10.0/10.5 0.5/ 1.0 2.0/ 2.5 13-17 None

15/06 AM 10.7/11.2 1.2/ 1.7 1.5/ 2.0 12-15 Minor

15/06 PM 8.9/ 9.4 -0.7/-0.2 1.0/ 1.5 8-10 None

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

-------- --------- --------- --------- ------- --------

13/04 AM 9.2/ 9.7 -0.3/ 0.2 0.8/ 1.3 5 None

13/05 PM 8.1/ 8.6 -1.5/-1.0 0.7/ 1.1 5 None

14/05 AM 9.5/10.0 0.0/ 0.5 1.1/ 1.6 4-5 None

14/05 PM 9.0/ 9.5 -0.6/-0.1 2.1/ 2.6 8-10 None

15/06 AM 10.0/10.5 0.5/ 1.0 1.6/ 2.0 9-10 Minor

15/07 PM 7.8/ 8.4 -1.7/-1.2 0.9/ 1.4 5-7 None

Boston Harbor

MLLW Categories - Minor 12.5 ft, Moderate 14.0 ft, Major 15.0 ft

MHHW Categories - Minor 2.4 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

-------- --------- --------- --------- ------- --------

13/04 AM 10.6/11.1 0.5/ 1.0 0.8/ 1.3 1 None

13/04 PM 9.4/ 9.9 -0.8/-0.2 0.7/ 1.1 2 None

14/05 AM 11.0/11.5 0.9/ 1.4 1.3/ 1.8 2 None

14/05 PM 10.4/10.9 0.2/ 0.8 2.0/ 2.5 2 None

15/06 AM 12.3/12.8 2.2/ 2.7 2.6/ 3.1 2 Minor

15/06 PM 9.3/ 9.8 -0.9/-0.4 1.1/ 1.6 2 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

-------- --------- --------- --------- ------- --------

13/04 AM 10.6/11.1 0.7/ 1.1 0.8/ 1.3 1 None

13/04 PM 9.3/ 9.8 -0.7/-0.2 0.7/ 1.1 1-2 None

14/04 AM 10.8/11.3 0.9/ 1.4 1.2/ 1.7 2 None

14/05 PM 10.2/10.7 0.2/ 0.8 1.9/ 2.3 2 None

15/05 AM 12.1/12.6 2.2/ 2.7 2.6/ 3.1 2 Minor-Mdt

15/06 PM 9.1/ 9.6 -0.9/-0.4 1.1/ 1.6 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

-------- --------- --------- --------- ------- --------

13/04 AM 10.2/10.7 0.5/ 1.0 0.8/ 1.3 5 None

13/04 PM 9.0/ 9.5 -0.8/-0.2 0.7/ 1.1 5 None

14/05 AM 10.6/11.1 0.9/ 1.4 1.2/ 1.7 5-7 None

14/05 PM 10.1/10.6 0.4/ 0.9 2.0/ 2.5 11-14 None

15/06 AM 12.0/12.5 2.2/ 2.7 2.6/ 3.1 11-13 Minor-Mdt

15/06 PM 9.1/ 9.6 -0.7/-0.2 1.2/ 1.7 7-8 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

-------- --------- --------- --------- ------- --------

13/01 PM 2.5/ 3.0 0.5/ 1.0 0.7/ 1.1 2-3 None

14/01 AM 3.4/ 3.9 1.4/ 1.9 1.3/ 1.8 4 None

14/01 PM 2.7/ 3.2 0.8/ 1.3 1.3/ 1.8 4 None

15/02 AM 1.9/ 2.3 -0.2/ 0.3 -0.2/ 0.2 6-7 None

15/03 PM 2.3/ 2.8 0.4/ 0.9 0.7/ 1.1 5 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

-------- --------- --------- --------- ------- --------

13/04 AM 5.9/ 6.4 -1.9/-1.4 0.8/ 1.3 5-6 None

13/05 PM 4.7/ 5.2 -3.0/-2.5 0.7/ 1.1 5-6 None

14/05 AM 6.2/ 6.7 -1.6/-1.1 1.1/ 1.6 7-9 None

14/06 PM 5.0/ 5.5 -2.7/-2.2 1.0/ 1.5 13-14 None

15/06 AM 6.4/ 6.9 -1.4/-0.9 1.3/ 1.8 12 None

15/07 PM 5.1/ 5.6 -2.7/-2.2 1.2/ 1.7 9-10 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

-------- --------- --------- --------- ------- --------

13/04 AM 4.7/ 5.2 0.2/ 0.8 0.8/ 1.3 4-5 None

13/05 PM 4.0/ 4.5 -0.6/-0.1 0.8/ 1.3 4-5 None

14/06 AM 5.2/ 5.7 0.8/ 1.3 1.2/ 1.7 6-8 None

14/06 PM 4.2/ 4.7 -0.3/ 0.2 1.1/ 1.6 10-13 None

15/06 AM 5.2/ 5.7 0.8/ 1.3 1.1/ 1.6 10-11 None

15/07 PM 4.2/ 4.7 -0.3/ 0.2 1.1/ 1.6 7-9 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

-------- --------- --------- --------- ------- --------

13/04 AM 10.7/11.2 0.6/ 1.1 0.8/ 1.3 4 None

13/04 PM 9.4/ 9.9 -0.8/-0.2 0.6/ 1.1 4 None

14/05 AM 10.8/11.3 0.7/ 1.1 0.9/ 1.4 6-8 None

14/05 PM 10.8/11.3 0.7/ 1.1 2.2/ 2.7 12-19 None

15/06 AM 12.5/13.0 2.3/ 2.8 2.6/ 3.1 13-15 None

15/06 PM 9.6/10.1 -0.6/-0.1 1.3/ 1.8 9-11 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

-------- --------- --------- --------- ------- --------

13/04 AM 11.1/11.6 0.6/ 1.1 0.9/ 1.4 3 None

13/04 PM 9.6/10.1 -1.0/-0.5 0.6/ 1.1 3-4 None

14/05 AM 11.0/11.5 0.5/ 1.0 0.9/ 1.4 4-6 None

14/05 PM 11.2/11.7 0.7/ 1.1 2.3/ 2.8 7-10 None

15/06 AM 12.7/13.2 2.2/ 2.7 2.6/ 3.1 8-9 Minor-Mdt

15/06 PM 10.1/10.6 -0.5/ 0.0 1.5/ 2.0 6-7 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

-------- --------- --------- --------- ------- --------

13/04 AM 9.5/10.0 -0.9/-0.4 0.8/ 1.3 4 None

13/04 PM 8.3/ 8.8 -2.0/-1.6 0.7/ 1.1 3-4 None

14/05 AM 9.8/10.3 -0.6/-0.1 1.2/ 1.7 3-5 None

14/05 PM 9.5/10.0 -0.9/-0.4 2.1/ 2.6 6-10 None

15/06 AM 11.2/11.7 0.9/ 1.4 2.6/ 3.1 8-9 Minor

15/06 PM 8.7/ 9.2 -1.7/-1.2 1.4/ 1.9 6-7 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

-------- --------- --------- --------- ------- --------

13/01 PM 4.0/ 4.5 -0.5/ 0.0 0.8/ 1.3 3 None

14/02 AM 5.0/ 5.5 0.6/ 1.1 1.2/ 1.7 3 None

14/01 PM 4.2/ 4.7 -0.2/ 0.2 1.4/ 1.9 3 None

15/02 AM 4.0/ 4.5 -0.3/ 0.2 0.2/ 0.8 4 None

15/03 PM 3.7/ 4.2 -0.7/-0.2 0.7/ 1.1 5 None

&&

$$

{{Cite web |last=herzmann |first=daryl |title=IEM :: Valid Time Event Code (VTEC) App |url=https://mesonet.agron.iastate.edu/vtec/ |access-date=2023-06-02 |website=mesonet.agron.iastate.edu |language=en}}

References

External links

[http://www.nws.noaa.gov/ National Weather Service]

Category:Weather warnings and advisories

Coastal flood watch

Example

See also

References

External links