723  
WHUS41 KLWX 170033  
CFWLWX  
 
COASTAL HAZARD MESSAGE  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
833 PM EDT THU AUG 16 2018  
 
MDZ508-170845-  
/O.NEW.KLWX.CF.Y.0067.180817T0400Z-180817T1200Z/  
SOUTHEAST HARFORD-  
833 PM EDT THU AUG 16 2018  
 
...COASTAL FLOOD ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM  
EDT FRIDAY...  
 
THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS  
ISSUED A COASTAL FLOOD ADVISORY, WHICH IS IN EFFECT FROM MIDNIGHT  
TONIGHT TO 8 AM EDT FRIDAY.  
 
* LOCATIONS...SHORELINE IN SOUTHEAST HARFORD COUNTY.  
 
* TIDAL DEPARTURE...1.5 TO 2 FEET ABOVE NORMAL DUE LARGELY TO  
EXCESS FRESH WATER FROM THE SUSQUEHANNA RIVER.  
 
* TIMING...AROUND THE TIME OF HIGH TIDE. HIGH TIDE AT HAVRE DE  
GRACE IS AT 3:30 AM.  
 
* IMPACTS...WATER IS EXPECTED TO GO OVER THE BULKHEAD AT THE  
HAVRE DE GRACE YACHT BASIN. MINOR SHORELINE INUNDATION UP TO ONE  
FOOT ABOVE GROUND IS POSSIBLE ELSEWHERE.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A COASTAL FLOOD ADVISORY INDICATES THAT ONSHORE WINDS AND TIDES  
WILL COMBINE TO GENERATE FLOODING OF LOW AREAS ALONG THE SHORE.  
 

 
 

 
 
FORECAST TIDES ARE REFERENCED TO MEAN LOWER LOW WATER  
(MLLW) AND MEAN HIGHER HIGH WATER (MHHW) UNLESS  
OTHERWISE NOTED. TIME OF HIGH TOTAL TIDE IS  
APPROXIMATE TO NEAREST HOUR. TOTAL TIDE COMBINES THE  
NORMAL TIDE AND DEPARTURE FROM NORMAL. FLOOD IMPACT  
IS BASED ON THE TOTAL TIDE AND WAVES WHERE APPLICABLE.  
 
HAVRE DE GRACE MD  
MLLW CATEGORIES - MINOR 4.0 FT, MODERATE 5.5 FT, MAJOR 7.0 FT  
MHHW CATEGORIES - MINOR 2.2 FT, MODERATE 3.7 FT, MAJOR 5.2 FT  
 
TOTAL TOTAL DEPARTURE  
DAY/TIME TIDE TIDE FROM NORM WAVES FLOOD  
FT MLLW FT MHHW FT FT IMPACT  
-------- --------- --------- --------- ------- --------  
17/03 AM 4.2 1.8 1.7 0.5 MINOR  
17/03 PM 3.4 1.0 1.3 1.0 NONE  
18/04 AM 3.6 1.2 1.0 0.5 NONE  
18/04 PM 2.8 0.4 0.8 0.5 NONE  
19/05 AM 3.4 1.0 0.8 0.5 NONE  
19/05 PM 2.5 0.1 0.6 0.5 NONE  
 

 
 

 
 
DHOF  
 
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