Tropical Cyclone Potential Marine Impact
 for East Central Florida

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Impact Levels
Marine – Potential Impact Descriptions
Extreme
Potential for Extreme Impact: Aggressively prepare for the threat of strong tropical storm or hurricane conditions aboard marine vessels for extreme prevailing winds and/or combined seas. If realized, expect an extreme impact for mariners. At Beaufort Scale 10, very high waves with long overhanging crests form. Visibility is very seriously affected from blowing dense foam and spray.  At Beaufort Scale 12, medium sized ships may be lost to view behind the exceptionally high waves as the air also fills with foam and spray. Bay and inland waters extremely rough. Descriptions are consistent with sustained winds of 48 knots or greater along with higher gusts (Beaufort Scale 10+) and/or combined seas 32 feet or greater (if left to fully develop). Small craft should seek safe harbor or remain in port.    
High
Potential for High Impact: Aggressively prepare for the threat of tropical storm conditions aboard marine vessels for intense prevailing winds and/or combined seas. If realized, expect a high impact for mariners. At Beaufort Scale 9, high waves with the visibility becoming affected by blowing foam and spray. Small ships possibly lost to view behind waves. Bay and inland waters very rough to extremely rough. Descriptions are consistent with sustained winds of 34-47 knots with higher gusts (Beaufort Scale 8-9) and/or combined seas of 19 to 32 feet (if left to fully develop). Small craft should seek safe harbor or remain in port.      
Moderate
Potential for Moderate Impact: Prepare for the threat of small craft advisory conditions with strong prevailing winds and/or large combined seas. If realized, expect a moderate impact for mariners. At Beaufort Scale 6, larger waves form. At Beaufort Scale 7, even larger waves form, but with seas beginning to heap up. Bay and inland waters rough to very rough. Descriptions are consistent with sustained winds of 22-33 knots with higher gusts (Beaufort Scale 6-7) and/or combined seas of 10 to 18 feet (if left to fully develop). Small craft should remain in port.
Low
Potential for Low but Concerning Impact: Prepare for the threat of small craft advisory conditions with moderate prevailing winds and/or large combined seas. If realized, expect a low but concerning impact for mariners. At Beaufort Scale 5, moderate waves develop but with a more pronounced long form. Bay and inland waters very choppy to rough. Descriptions are consistent with sustained winds of 17-21 knots with higher gusts (Beaufort Scale 5) and/or combined seas of 7 to 9 feet (if left to fully develop). Small craft should remain in port, but if they must go out they should not venture far from port.    
None
Potential for Little to No Impact: Preparations are not needed as appreciable impact is unlikely. However, conditions conducive for small craft to exercise caution may still occur with sustained winds up 16 knots (Beaufort Scale 4) and/or seas up to 6 feet. Bay and inland waters may also be choppy.

 


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