038  
WTPZ41 KNHC 311437  
TCDEP1  
 
POST-TROPICAL CYCLONE ALVIN DISCUSSION NUMBER 12  
NWS NATIONAL HURRICANE CENTER MIAMI FL EP012025  
800 AM MST SAT MAY 31 2025  
 
COOL WATERS, DRY MID-LEVEL AIR, AND STRONG VERTICAL WIND SHEAR  
HAVE TAKEN THEIR TOLL ON ALVIN. THE SYSTEM HAS BEEN DEVOID OF DEEP  
CONVECTION FOR MORE THAN 12 HOURS, AND HAS BECOME A SWIRL OF LOW- TO  
MID-LEVEL CLOUDS. THE INITIAL INTENSITY HAS BEEN LOWERED TO A  
POSSIBLY GENEROUS 30 KT. CONTINUED HOSTILE ENVIRONMENTAL  
CONDITIONS ARE EXPECTED TO PREVENT ANY RETURN OF DEEP CONVECTION,  
AND THEREFORE THIS WILL BE THE FINAL ADVISORY ON THE SYSTEM AS IT  
HAS BECOME A POST-TROPICAL REMNANT LOW.  
 
THE LOW SHOULD CONTINUE TO SPIN DOWN AS IT MOVES SLOWLY NORTHWARD  
TODAY. GLOBAL MODEL GUIDANCE INDICATES THAT THE LOW WILL OPEN UP  
INTO A TROUGH OF LOW PRESSURE AS IT PASSES NEAR THE SOUTHERN TIP OF  
THE BAJA CALIFORNIA PENINSULA IN ABOUT 24 HOURS.  
 
SWELLS GENERATED BY ALVIN ARE EXPECTED TO PERSIST ALONG PORTIONS OF  
THE WEST-CENTRAL MAINLAND MEXICO AND SOUTHERN BAJA CALIFORNIA  
COASTS THROUGH THE WEEKEND, CREATING POTENTIALLY DANGEROUS SURF AND  
RIP CURRENT CONDITIONS.  
 
FORECAST POSITIONS AND MAX WINDS  
 
INIT 31/1500Z 20.7N 109.5W 30 KT 35 MPH...POST-TROPICAL  
12H 01/0000Z 21.8N 109.7W 25 KT 30 MPH...POST-TROP/REMNT LOW  
24H 01/1200Z...DISSIPATED  
 

 
FORECASTER BROWN  
 
 
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