914  
WHUS43 KGRR 051810  
CFWGRR  
 
LAKESHORE HAZARD MESSAGE  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
210 PM EDT SUN AUG 5 2018  
 
MIZ037-043-050-056-060000-  
/O.CON.KGRR.BH.S.0010.000000T0000Z-180806T0000Z/  
MASON-OCEANA-MUSKEGON-OTTAWA-  
210 PM EDT SUN AUG 5 2018  
 
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 8 PM EDT THIS  
EVENING...  
 
* HIGH WAVE ACTION... STRONG CURRENTS AND DANGEROUS SWIMMING  
CONDITIONS EXPECTED.  
 
* STRONG STRUCTURAL CURRENTS EXPECTED.  
 
* STRONG LONGSHORE CURRENTS EXPECTED.  
 
* RIP CURRENTS POSSIBLE.  
 
* LOCATION...BEACHES FROM GRAND HAVEN NORTH TO MANISTEE  
 
* BEACHES WITH PARTICULARLY DANGEROUS CONDITIONS INCLUDE...  
 
PERE MARQUETTE PARK IN MUSKEGON.  
 
* OVERVIEW/POTENTIAL IMPACTS...WINDS FROM THE SOUTH WILL  
INCREASE TONIGHT INTO THE 15 TO 25 MPH RANGE AND CONTINUE AT  
THOSE SPEEDS THROUGH SUNDAY. WAVES ARE EXPECTED TO REACH THE 3  
TO 5 FOOT RANGE NORTH OF GRAND HAVEN ON SUNDAY. WAVES OF THIS  
HEIGHT CAN MAKE FOR DANGEROUS SWIMMING CONDITIONS DUE TO BOTH  
THE WAVES AND CURRENTS THAT ARE EXPECTED TO DEVELOP. SOUTH  
SIDES OF SOUTH PIERS ON DAYS LIKE THIS ARE HAZARDOUS PLACES TO  
SWIM.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
HIGH WAVE ACTION MAKES SWIMMING DIFFICULT AND CAN TIRE EVEN A  
STRONG SWIMMER QUICKLY.  
 
STRUCTURAL CURRENTS FORM ALONG PIERS WHERE LONGSHORE CURRENTS AND  
WAVE ACTION FLOW INTO THE STRUCTURE. STRUCTURAL CURRENTS CAN  
SWEEP YOU OUT INTO DEEPER WATER ALONG THE PIER STRUCTURE.  
 
A LONGSHORE CURRENT IS A LAKE CURRENT THAT MOVES PARALLEL TO  
SHORE. LONGSHORE CURRENTS CAN BE STRONG ENOUGH TO PREVENT  
SWIMMERS FROM BEING ABLE TO KEEP THEIR FEET ON THE BOTTOM...  
MAKING IT DIFFICULT TO RETURN TO SHORE.  
 
RIP CURRENTS ARE POWERFUL CHANNELS OF WATER FLOWING QUICKLY AWAY  
FROM SHORE...WHICH OCCUR MOST OFTEN AT LOW SPOTS OR BREAKS IN  
SANDBARS. RIP CURRENTS CAN SWEEP YOU INTO DEEPER WATER.  
 

 
 

 
 
WEATHER.GOV/GRR  
 
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