471  
WHUS43 KGRR 181504  
CFWGRR  
 
COASTAL HAZARD MESSAGE  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
1104 AM EDT FRI AUG 18 2017  
 
MIZ037-043-050-056-064-071-182315-  
/O.CON.KGRR.BH.S.0014.000000T0000Z-170819T0100Z/  
MASON-OCEANA-MUSKEGON-OTTAWA-ALLEGAN-VAN BUREN-  
1104 AM EDT FRI AUG 18 2017  
 
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 9 PM EDT THIS  
EVENING...  
 
* HIGH WAVE ACTION... STRONG CURRENTS AND DANGEROUS SWIMMING  
CONDITIONS EXPECTED.  
 
* STRONG STRUCTURAL CURRENTS EXPECTED.  
 
* STRONG LONGSHORE CURRENTS EXPECTED.  
 
* RIP CURRENTS EXPECTED.  
 
* LOCATION...BEACHES FROM ST JOSEPH TO MANISTEE.  
 
* BEACHES WITH PARTICULARLY DANGEROUS CONDITIONS TODAY INCLUDE  
STEARNS PARK IN LUDINGTON... MEARS STATE PARK IN PENTWATER...  
MUSKEGON STATE PARK...HOLLAND STATE PARK...AND NORTH BEACH IN  
SOUTH HAVEN.  
 
* OVERVIEW/POTENTIAL IMPACTS...WEST WINDS OF 15 T0 25 MPH AND  
WAVES OF 4 TO 7 FEET ARE EXPECTED FOR THE REST OF TODAY. NORTH  
SIDES OF NORTH PIERS WILL BE DANGEROUS 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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