159  
WHUS76 KMFR 201016  
MWWMFR  
 
URGENT - MARINE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE MEDFORD OR  
316 AM PDT WED SEP 20 2017  
   
..STEEP AND HAZARDOUS SEAS THROUGH TONIGHT
 
 
.STEEP NORTHWEST SWELL WILL PERSIST TODAY, AND THEN GRADUALLY  
SUBSIDE TONIGHT ACROSS MOST OF THE AREA. HOWEVER, SEAS ARE  
EXPECTED TO REMAIN ELEVATED AND HAZARDOUS TO SMALL CRAFT FOR  
PORTIONS OF THE AREA BEYOND 10 NAUTICAL MILES OF THE COAST SOUTH  
OF CAPE BLANCO.  
 
PZZ350-356-202330-  
/O.CAN.KMFR.SC.Y.0080.000000T0000Z-170921T1200Z/  
/O.NEW.KMFR.SW.Y.0083.170920T1016Z-170921T1200Z/  
COASTAL WATERS FROM FLORENCE TO CAPE BLANCO OR OUT 10 NM-  
COASTAL WATERS FROM CAPE BLANCO OR TO PT. ST. GEORGE CA OUT 10 NM-  
316 AM PDT WED SEP 20 2017  
 
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS IN EFFECT UNTIL 5 AM  
PDT THURSDAY...  
 
THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A SMALL CRAFT  
ADVISORY FOR HAZARDOUS SEAS...WHICH IS IN EFFECT UNTIL 5 AM PDT  
THURSDAY.  
 
* SEAS...STEEP NORTHWEST SWELL DOMINATED AT 8 TO 11 FEET WITH A  
DOMINANT PERIOD OF 12 SECONDS, SHORTENING TO 10 SECONDS.  
 
* AREAS AFFECTED...INITIALLY, ALL AREAS WILL BE AFFECTED. HOWEVER,  
AFTER ABOUT SUNRISE THIS MORNING AREAS SOUTH OF PORT ORFORD  
WITHIN 10 NAUTICAL MILES OF THE COAST ARE EXPECTED TO SEE WAVE  
CONDITIONS IMPROVE TO LESS HAZARDOUS THAN ADVISORY LEVEL.  
 
* VIEW THE HAZARD AREA IN DETAIL AT  
HTTPS://WWW.WRH.NOAA.GOV/MFR/HAZARD  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS MEANS THAT WAVES WILL  
BE STEEP ENOUGH TO CREATE A POTENTIAL HAZARD TO SMALLER VESSELS  
AND INEXPERIENCED MARINERS.  
 

 
 

 
 
PZZ370-202330-  
/O.CAN.KMFR.SC.Y.0080.000000T0000Z-170922T1200Z/  
/O.NEW.KMFR.SW.Y.0083.170920T1016Z-170921T1200Z/  
WATERS FROM FLORENCE TO CAPE BLANCO OR FROM 10 TO 60 NM-  
316 AM PDT WED SEP 20 2017  
 
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS IN EFFECT UNTIL 5 AM  
PDT THURSDAY...  
 
THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A SMALL CRAFT  
ADVISORY FOR HAZARDOUS SEAS...WHICH IS IN EFFECT UNTIL 5 AM PDT  
THURSDAY.  
 
* SEAS...STEEP NORTHWEST SWELL DOMINATED AT 9 TO 13 FEET WITH A  
DOMINANT PERIOD OF 12 SECONDS, SHORTENING TO 10 SECONDS.  
 
* AREAS AFFECTED...ALL AREAS WILL BE AFFECTED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS MEANS THAT WAVES WILL  
BE STEEP ENOUGH TO CREATE A POTENTIAL HAZARD TO SMALLER VESSELS  
AND INEXPERIENCED MARINERS.  
 

 
 

 
 
PZZ376-202330-  
/O.EXT.KMFR.SC.Y.0080.000000T0000Z-170925T0600Z/  
WATERS FROM CAPE BLANCO OR TO PT. ST. GEORGE CA FROM 10 TO 60 NM-  
316 AM PDT WED SEP 20 2017  
   
..SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 11 PM PDT SUNDAY
 
 
* SEAS...STEEP NORTHWEST SWELL DOMINATED AT 9 TO 12 FEET WITH A  
DOMINANT PERIOD OF 12 SECONDS, SHORTENING TO 10 SECONDS TODAY  
AND TONIGHT. 8 TO 10 FOOT SEAS AT 10 SECONDS ARE THEN EXPECTED  
THURSDAY THROUGH FRIDAY MORNING. SEAS ARE EXPECTED TO STEEPEN  
FRIDAY AFTERNOON THROUGH THE WEEKEND.  
 
* WINDS...WINDS ARE EXPECTED TO REMAIN BELOW ADVISORY LEVELS  
UNTIL FRIDAY AFTERNOON AND EVENING. SEAS WILL THEN INCREASE TO  
15 TO 25 KNOTS WITH GUSTS 25 TO 35 KNOTS.  
 
* AREAS AFFECTED...THE ENTIRE MARINE AREA 10 TO 60 MILES AWAY FROM  
SHORE WILL BE AFFECTED BY SMALL CRAFT CONDITIONS TODAY AND  
TONIGHT. CONDITIONS WILL THEN IMPROVE FOR THURSDAY AND THURSDAY  
NIGHT INSIDE OF 40 NAUTICAL MILES FROM THE COAST.  
 
* VIEW THE HAZARD AREA IN DETAIL AT  
HTTPS://WWW.WRH.NOAA.GOV/MFR/HAZARD  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A SMALL CRAFT ADVISORY MEANS THAT WINDS AND SEAS WILL CREATE A  
POTENTIAL HAZARD TO SMALLER VESSELS AND INEXPERIENCED MARINERS.  
 

 
 

 
 
BTL  
 
HTTP://WWW.WEATHER.GOV/MEDFORD  
 
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