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Experimental
TROPICAL CYCLONE IMPACTS - DECISION SUPPORT


Wind	Storm Surge	Inland Flooding	Tornadoes	Marine

Marine

Marine Hazard -

Potential Impact

Impact to Life and Property

None

Very Low

Low

Moderate

High

Extreme

Description: The graphic depicts the potential marine impact from tropical cyclone winds and waves across the specified area valid through the event. It is based on the likelihood of experiencing tropical cyclone force winds combined with the anticipated strength of the winds.

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Depiction of the Tropical Cyclone Marine Hazard for South Florida. This graphic was created by the National Weather Service.

Important Note: Worded expressions describe the expected impact relative to the latest forecast conditions, while Graphic expressions convey the potential impact relative to the uncertainty of forecast conditions.

Hurricane Local Statement for South Florida

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SITUATION OVERVIEW
EXPECTED CONDITIONS AND IMPACTS FOR ALL AREAS:

TEST.

...MARINE...
EXPECTED CONDITIONS AND IMPACTS FOR THE FOLLOWING AREAS:

LAKE OKEECHOBEE, BISCAYNE BAY, COASTAL WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL OUT 20 NM, COASTAL WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL OUT 20 NM, WATERS FROM JUPITER INLET TO DEERFIELD BEACH, FL EXTENDING FROM 20 NM TO 60 NM, WATERS FROM DEERFIELD BEACH TO OCEAN REEF, FL EXTENDING FROM 20 NM TO THE TERRITORIAL WATERS OF THE BAHAMAS, GLADES, HENDRY, INLAND PALM BEACH, METRO PALM BEACH, COASTAL COLLIER, INLAND COLLIER, INLAND BROWARD, METRO BROWARD, INLAND MIAMI DADE, METRO MIAMI DADE, MAINLAND MONROE, COASTAL PALM BEACH, COASTAL BROWARD, COASTAL MIAMI DADE, FAR SOUTH MIAMI DADE, COASTAL WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL OUT 20 NM, COASTAL WATERS FROM EAST CAPE SABLE TO CHOKOLOSKEE, FL OUT 20 NM, GULF WATERS FROM CHOKOLOSKEE TO BONITA BEACH, FL EXTENDING FROM 20 TO 60 NM

TEST.

None	Threat - No discernable threat to life and property aboard marine vessels, even small craft; prevailing winds and combined seas are non-threatening. Minimum Action - Evaluate tropical cyclone emergency plans and ensure seasonal preparedness activities are complete onboard. Potential Impact - Impact to local mariners should be negligible; some swell may still be present while bay and inland waters may also have some chop.
Very Low	Threat - A limited threat to life and property aboard marine vessels, especially small craft; the likelihood for sustained winds of 14-16 knots (Beaufort Scale 4) and/or combined seas of 4 to 6 feet (if left to fully develop). Minimum Action - Prepare for the likelihood of Small Craft Exercise Caution conditions with prevailing winds and/or combined seas becoming moderate. Small craft should not venture far from port. Potential Impact - A very low impact to mariners in the specified area. At Beaufort Scale 4, small to moderate waves develop but with a long form. Bay and inland waters choppy.
Low	Threat - An elevated threat to life and property aboard marine vessels, especially small craft; the likelihood for 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). Minimum Action - Prepare for the likelihood of Small Craft Advisory conditions with moderate prevailing winds and/or moderate combined seas. Small craft should remain in port, but if they must go out they should not venture far from port. Potential Impact - A low impact to mariners in the specified area. At Beaufort Scale 5, moderate waves develop but with a more pronounced long form. Bay and inland waters very choppy to rough.
Moderate	Threat - A significant threat to life and property aboard marine vessels, especially small craft; the likelihood for 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). Minimum Action - Prepare for the likelihood of Small Craft Advisory conditions with strong prevailing winds and/or large combined seas. Small craft should remain in port. Potential Impact - A moderate impact to mariners in the specified area. 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
High	Threat - A critical threat to life and property aboard marine vessels, especially small craft; the likelihood for 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). Minimum Action - Prepare for the likelihood of Tropical Storm conditions with intense prevailing winds and/or very large combined seas. Small craft should seek safe harbor or remain in port. Potential Impact - A high impact to mariners in the specified area. At Beaufort Scale 8, high waves of greater length form. 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.
Extreme	Threat - An extreme threat to life and property aboard marine vessels, especially small craft; the likelihood for 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). Minimum Action - Prepare for the likelihood of Strong Tropical Storm or Hurricane conditions with extreme prevailing winds and/or extreme combined seas. Small craft should seek safe harbor or remain in port. Potential Impact - An extreme impact to mariners in the specified area. 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.

National Weather Service Weather Forecast Office