Sunrise 6:39 AM   Sunset 8:08 PM Moonrise 5:37 PM   Moonset 4:09 AM

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GMZ035 Expires:202405220300;;618346 Fzus52 Kkey 212016 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 416 pm edt Tue may 21 2024
florida bay, hawk channel and straits of florida from ocean reef to south of dry tortugas, and the extreme southeastern gulf of mexico, including the florida keys national marine sanctuary
seas are given as significant wave height, which is the average height of the highest 1/3 of the waves. Individual waves may be more than twice the significant wave height.
wave detail will include details about the period and direction of origin for the highest energy waves. Long-period swells coming from a different direction than the wind would be included in the wave detail.
gmz032-035-220300- bayside and gulf side from craig key to west end of seven mile bridge- gulf of mexico from west end of seven mile bridge to halfmoon shoal out to 5 fathoms- 416 pm edt Tue may 21 2024
Tonight - Variable winds near 5 knots, becoming northeast to east. Seas 1 foot or less. NEarshore waters smooth. Isolated showers and Thunderstorms.Wednesday - Northeast to east winds 5 to 10 knots, becoming east to southeast and increasing to near 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop, becoming a light chop. Isolated showers and Thunderstorms.Wednesday night - East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers and Thunderstorms. Thursday - East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers. Thursday night and Friday - East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers. Friday night - East to southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers. Saturday and Saturday night - Southeast winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers. Sunday - Southeast to south winds 5 to 10 knots. Seas 1 foot or less. NEarshore waters smooth to a light chop. Isolated showers. Sunday night - Southeast to south winds near 10 knots, increasing to 10 to 15 knots. Seas around 1 foot, building to 1 to 2 feet. NEarshore waters a light chop, becoming a light to moderate chop. Isolated showers.

GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 416 Pm Edt Tue May 21 2024
Synopsis - A weak area of low pressure in the vicinity of the bahamas will continue to decay as it slides northeastward in the north atlantic. As an expansive ridge of high pressure builds in its wake, light and variable breezes will gradually clock around to the east to southeast through Saturday, then to the southeast to south on Sunday.
the approximate shoreward edge of the gulf stream as of may 15, 2024 - .
49 nm south of dry tortugas light - .on loggerhead key. 32 nm south of cosgrove shoal light - .off the marquesas keys. 24 nm south of sand key light - .off key west. 27 nm south of looe key - .off big pine key. 29 nm south of sombrero key light - .off marathon. 8 nm southeast of alligator reef light - .off islamorada. 3 nm southeast of molasses reef light - .off key largo.
gulf stream information courtesy of the national weather service in key west.

FXUS62 KKEY 211902 AFDKEY

Area Forecast Discussion National Weather Service Key West FL 302 PM EDT Tue May 21 2024

New DISCUSSION, MARINE, AVIATION

DISCUSSION
Issued at 256 PM EDT Tue May 21 2024 Synoptic composite analysis highlights an amplified shortwave trough with its axis east of the Florida Peninsula, with its counterpart upper-level ridge bridging over the Gulf of Mexico and now reaching our westernmost coastal waters. Meanwhile, at the surface, a weak area of low pressure east of the Bahamas continues to trek slowly eastward, with a weak area of high pressure over the Mid-Atlantic states building in its wake. The interaction of the low and high pressure features has resulted in a weak surface pressure gradient over the Florida Keys, with generally light and variable flow. The light flow has promoted a broken cumulus cloud line in the vicinity of the Lower Keys, occasionally dishing out a few showers. Outside of a couple stronger cells in the vicinity of Card Sound in the Upper Keys, mid- level dry air aloft is likely stinting shower activity from growing very deep. Outside of these showers, skies are partly cloudy across the island communities, with temperatures generally in the upper 80s.

For tonight, drier air will continue to filter into the Florida Keys aloft. Shower and thunderstorm activity will likely be isolated in nature, associated with any potential weak nocturnal boundary collisions. Given the less organized nature of this convection with minimal upper-level support of ascent, did elect to nudge PoPs down to slight levels.

The aforementioned ridge over the Gulf will continue to slide eastward, bridging over the Florida Peninsula by late in the week and into the weekend. Forecast soundings suggest formidable dry air aloft for these periods, and thus have retained very low PoPs and removed mention of thunder for Thursday through Monday.

There are early indications in ensemble global numerical weather prediction guidance of yet another shortwave trough propagating across the Southeast and Mid- Alantic for the early to middle of next week. Should this pan out with a breakdown in ridging, this may provide the best measurable rain chances for the foreseeable future locally. In terms of temperatures, seasonably warm and muggy conditions will persist, with highs near 90F, lows in the lower 70s, and dew points generally in the lower to mid 70s.

MARINE
Issued at 256 PM EDT Tue May 21 2024 There are no watches, warnings, or advisories in effect for the Florida Keys coastal waters. From synopsis, a weak area of low pressure in the vicinity of the Bahamas will continue to decay as it slides northeastward in the North Atlantic. As an expansive ridge of high pressure builds in its wake, light and variable breezes will gradually clock around to the east to southeast through Saturday, then to the southeast to south on Sunday.

AVIATION
(18Z TAFS)
Issued at 256 PM EDT Tue May 21 2024 VFR conditions are expected at the island terminals. With that said, the environment is capable of supporting convective development.
This along with day time heating may result in a round or two of sub VFR conditions. Surface winds will be light and variable.

PRELIMINARY POINT TEMPS/POPS
Key West 87 80 89 80 / 20 20 20 20 Marathon 87 80 88 81 / 20 20 20 20

KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...None.

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Gopher Key
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Tue -- 02:42 AM EDT     0.35 feet Low Tide
Tue -- 05:09 AM EDT     Moonset
Tue -- 06:39 AM EDT     Sunrise
Tue -- 08:06 AM EDT     1.60 feet High Tide
Tue -- 03:56 PM EDT     -0.13 feet Low Tide
Tue -- 06:36 PM EDT     Moonrise
Tue -- 08:05 PM EDT     Sunset
Tue -- 09:34 PM EDT     1.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Gopher Key, Cudjoe Bay, Florida, Tide feet

Bahía Honda Harbor (Bridge) Florida Current
Click for Map
Tue -- 01:47 AM EDT     -2.01 knots Max Ebb
Tue -- 05:06 AM EDT     0.00 knots Slack
Tue -- 05:08 AM EDT     Moonset
Tue -- 06:38 AM EDT     Sunrise
Tue -- 07:19 AM EDT     1.00 knots Max Flood
Tue -- 09:58 AM EDT     -0.00 knots Slack
Tue -- 01:39 PM EDT     -2.36 knots Max Ebb
Tue -- 05:02 PM EDT     0.00 knots Slack
Tue -- 06:35 PM EDT     Moonrise
Tue -- 07:52 PM EDT     1.81 knots Max Flood
Tue -- 08:05 PM EDT     Sunset
Tue -- 11:12 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Bahia Honda Harbor (Bridge) Florida Current, knots

Full Color Weather Map

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Key West, FL,