Marine Weather and Tide Forecast for Big Coppitt Key, FL
September 11, 2024 10:04 AM EDT (14:04 UTC) Change Location
 | Sunrise 7:11 AM Sunset 7:35 PM Moonrise 1:40 PM Moonset 12:00 AM |
GMZ035 Expires:202409111430;;889243 Fzus52 Kkey 110818 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 418 am edt Wed sep 11 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.
gmz032-035-111430- 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- 418 am edt Wed sep 11 2024
Today - Southeast to south winds 5 to 10 knots, decreasing to near 5 knots in the afternoon. Seas 1 foot or less, except building to around 2 feet west of the marquesas keys due to west swell. NEarshore waters smooth to a light chop, becoming smooth. Scattered showers and isolated Thunderstorms.
Tonight - East to southeast winds near 5 knots, becoming southeast to south near 10 knots. Seas 1 foot or less, except around 2 feet west of the marquesas keys due to west swell. NEarshore waters smooth, becoming a light chop. Scattered showers and isolated Thunderstorms.
Thursday - Southeast to south winds 5 to 10 knots, becoming southwest to west near 5 knots in the afternoon. Seas 1 to 2 feet, except 2 to 3 feet west of the marquesas keys due to west swell. NEarshore waters smooth to a light chop, becoming smooth. Isolated showers and Thunderstorms.
Thursday night - Variable winds near 5 knots, becoming southeast to south after midnight. Seas 1 to 2 feet, except 2 to 3 feet west of the marquesas keys due to west swell. NEarshore waters smooth. Isolated showers and Thunderstorms.
Friday - Southwest to west winds near 5 knots, becoming northwest 5 to 10 knots in the afternoon. Seas 1 to 2 feet, except around 2 feet west of the marquesas keys due to west swell. NEarshore waters smooth, becoming smooth to a light chop. Isolated showers and Thunderstorms.
Friday night - Northwest to north winds near 5 knots, becoming variable. Seas 1 foot or less, except 1 to 2 feet west of the marquesas keys. NEarshore waters smooth. Scattered showers and isolated Thunderstorms.
Saturday - West to northwest winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Scattered showers and isolated Thunderstorms.
Saturday night - Northwest to north winds 5 to 10 knots. Seas around 1 foot. NEarshore waters smooth to a light chop. Scattered showers and isolated Thunderstorms.
Sunday - Northwest to north winds near 5 knots. Seas 1 foot or less. NEarshore waters smooth. Scattered showers and isolated Thunderstorms.
Sunday night - North to northeast winds near 5 knots. Seas 1 foot or less. NEarshore waters smooth. Scattered showers and isolated Thunderstorms.
coastal waters forecast for the florida keys national weather service key west fl 418 am edt Wed sep 11 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.
gmz032-035-111430- 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- 418 am edt Wed sep 11 2024
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 418 Am Edt Wed Sep 11 2024
Synopsis - Weak high pressure over the western atlantic will maintain light to gentle mainly east to southeast breezes across the keys coastal waters today and tonight, then light breezes will prevail Thursday through the weekend. Hurricane francine is forecast to make landfall on the louisiana coast this evening, then move inland over the lower mississippi valley Thursday through Friday. Westerly swells from francine will impact the western keys waters today through Friday.
the approximate shoreward edge of the gulf stream as of september 7 - .
65 nm south of dry tortugas light - .on loggerhead key. 44 nm south of cosgrove shoal light - .off the marquesas keys. 38 nm south of sand key light - .off key west. 35 nm south of looe key - .off big pine key. 33 nm south of sombrero key light - .off marathon. 19 nm southeast of alligator reef light - .off islamorada. 13 nm southeast of molasses reef light - .off key largo. 7 nm east of carysfort reef light - .off ocean reef.
gulf stream information courtesy of the naval oceanographic office.
the approximate shoreward edge of the gulf stream as of september 7 - .
65 nm south of dry tortugas light - .on loggerhead key. 44 nm south of cosgrove shoal light - .off the marquesas keys. 38 nm south of sand key light - .off key west. 35 nm south of looe key - .off big pine key. 33 nm south of sombrero key light - .off marathon. 19 nm southeast of alligator reef light - .off islamorada. 13 nm southeast of molasses reef light - .off key largo. 7 nm east of carysfort reef light - .off ocean reef.
gulf stream information courtesy of the naval oceanographic office.
FXUS62 KKEY 110822 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 422 AM EDT Wed Sep 11 2024
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 422 AM EDT Wed Sep 11 2024
Rather quiet conditions for September prevail across the Florida Keys on this early Wednesday morning, with radars detecting just widely scattered small showers over the eastern Straits, near the Upper Keys, and over the Gulf waters. Oppressive heat and humidity prevails along the Keys island chain, with temperatures in the lower to mid 80s and dewpoints in the upper 70s to near 80 producing heat indices in the mid 90s to near 100 degrees as of 4 AM. Surface analysis depicts weak high pressure over the western Atlantic, with a stationary front draped over central Florida and the northern Gulf, and Hurricane Francine over the western Gulf.
The 00Z Key West sounding sampled a very moist profile, with PW of 2.18 inches near the 90th percentile for the date. MIMIC-TPW satellite imagery shows a large area of 2 inch plus PWs covering our region, as tropical moisture remains pooled to the south of the persistent stationary front across the Florida peninsula.
Excessive heat and humidity will be the primary weather concern again today, with highs in the lower 90s and dewpoints in the upper 70s to near 80 producing max heat indices around 110F this afternoon. Accordingly, have issued a Heat Advisory from 10 AM through 7 PM. Convection will probably remain somewhat muted across the area again today, as it has for the past several days, with the best rain chances probably occurring within cloud streamers near and north of the island chain. One more minor SE wind push tonight should spark some scattered shower activity, as we have seen for the past couple of nights. Have maintained 30 percent PoPs for today and tonight.
We still expect mainly dry weather from Thursday through Friday, as Francine moves into across the Lower Mississippi Valley, with the lower to mid level ridge centered almost directly overhead and quite a bit of dry air in the mid levels. Have continued with 20 percent PoPs for those periods. As we head into the weekend, the subtropical ridge should finally be pushed south of our area, as a large trough takes shape across the Southeastern states into Florida. With plenty of moisture available, the suppressing influence of the ridge aloft removed or at least lessened, and very weak low level flow expected, this would be an ideal environment for various mesoscale interactions to spark convection. Have maintained near climo 40 percent PoPs from Saturday through Monday. Otherwise, heat and humidity will remain a concern, with a good chance that additional Heat Advisories will be needed each day through the weekend.
MARINE
Issued at 422 AM EDT Wed Sep 11 2024
Late night observations show SE breezes of 5 to 9 knots along the reef and at Long Key C-MAN, with seas at Satan Shoal running just above 1 foot in long period SW swell. No marine headlines are currently in effect, and none are expected through the rest of the week and the upcoming weekend. From the synopsis, weak high pressure over the western Atlantic will maintain light to gentle mainly east to southeast breezes across the Keys coastal waters today and tonight, then light breezes will prevail Thursday through the weekend. Hurricane Francine is forecast to make landfall on the Louisiana coast this evening, then move inland over the Lower Mississippi Valley Thursday through Friday.
Westerly swells from Francine will impact the western Keys waters today through Friday.
AVIATION
(06Z TAFS)
Issued at 422 AM EDT Wed Sep 11 2024
VFR conditions are expected to continue through the period.
Confidence on shower coverage is too low to include mentions of VCSH at this time. Otherwise, winds will remain light from the east and southeast through the forecast.
KEY WATCHES/WARNINGS/ADVISORIES
FL...Heat Advisory from 10 AM this morning to 7 PM EDT this evening for FLZ076>078.
GM...None.
Area Forecast Discussion National Weather Service Key West FL 422 AM EDT Wed Sep 11 2024
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 422 AM EDT Wed Sep 11 2024
Rather quiet conditions for September prevail across the Florida Keys on this early Wednesday morning, with radars detecting just widely scattered small showers over the eastern Straits, near the Upper Keys, and over the Gulf waters. Oppressive heat and humidity prevails along the Keys island chain, with temperatures in the lower to mid 80s and dewpoints in the upper 70s to near 80 producing heat indices in the mid 90s to near 100 degrees as of 4 AM. Surface analysis depicts weak high pressure over the western Atlantic, with a stationary front draped over central Florida and the northern Gulf, and Hurricane Francine over the western Gulf.
The 00Z Key West sounding sampled a very moist profile, with PW of 2.18 inches near the 90th percentile for the date. MIMIC-TPW satellite imagery shows a large area of 2 inch plus PWs covering our region, as tropical moisture remains pooled to the south of the persistent stationary front across the Florida peninsula.
Excessive heat and humidity will be the primary weather concern again today, with highs in the lower 90s and dewpoints in the upper 70s to near 80 producing max heat indices around 110F this afternoon. Accordingly, have issued a Heat Advisory from 10 AM through 7 PM. Convection will probably remain somewhat muted across the area again today, as it has for the past several days, with the best rain chances probably occurring within cloud streamers near and north of the island chain. One more minor SE wind push tonight should spark some scattered shower activity, as we have seen for the past couple of nights. Have maintained 30 percent PoPs for today and tonight.
We still expect mainly dry weather from Thursday through Friday, as Francine moves into across the Lower Mississippi Valley, with the lower to mid level ridge centered almost directly overhead and quite a bit of dry air in the mid levels. Have continued with 20 percent PoPs for those periods. As we head into the weekend, the subtropical ridge should finally be pushed south of our area, as a large trough takes shape across the Southeastern states into Florida. With plenty of moisture available, the suppressing influence of the ridge aloft removed or at least lessened, and very weak low level flow expected, this would be an ideal environment for various mesoscale interactions to spark convection. Have maintained near climo 40 percent PoPs from Saturday through Monday. Otherwise, heat and humidity will remain a concern, with a good chance that additional Heat Advisories will be needed each day through the weekend.
MARINE
Issued at 422 AM EDT Wed Sep 11 2024
Late night observations show SE breezes of 5 to 9 knots along the reef and at Long Key C-MAN, with seas at Satan Shoal running just above 1 foot in long period SW swell. No marine headlines are currently in effect, and none are expected through the rest of the week and the upcoming weekend. From the synopsis, weak high pressure over the western Atlantic will maintain light to gentle mainly east to southeast breezes across the Keys coastal waters today and tonight, then light breezes will prevail Thursday through the weekend. Hurricane Francine is forecast to make landfall on the Louisiana coast this evening, then move inland over the Lower Mississippi Valley Thursday through Friday.
Westerly swells from Francine will impact the western Keys waters today through Friday.
AVIATION
(06Z TAFS)
Issued at 422 AM EDT Wed Sep 11 2024
VFR conditions are expected to continue through the period.
Confidence on shower coverage is too low to include mentions of VCSH at this time. Otherwise, winds will remain light from the east and southeast through the forecast.
KEY WATCHES/WARNINGS/ADVISORIES
FL...Heat Advisory from 10 AM this morning to 7 PM EDT this evening for FLZ076>078.
GM...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| KYWF1 - 8724580 - Key West, FL | 15 mi | 47 min | SSE 7G | |||||
| SANF1 - Sand Key, FL | 20 mi | 5 min | SSE 11G | 86°F | 29.88 | 77°F | ||
| 42095 | 25 mi | 35 min | 88°F | 2 ft | ||||
| VCAF1 - 8723970 - Vaca Key, FL | 25 mi | 47 min | S 8G | |||||
| LONF1 - Long Key, FL | 41 mi | 5 min | SSE 8.9G | 86°F | 29.85 | 78°F | ||
| JKYF1 - Johnson Key, FL | 48 mi | 125 min | 89°F | |||||
| LRKF1 - Little Rabbit Key, FL | 48 mi | 125 min | 87°F | |||||
| MUKF1 - Murray Key, FL | 49 mi | 125 min | 89°F | |||||
| PKYF1 - Peterson Key, FL | 49 mi | 125 min | 88°F |
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KNQX
Terminal Aerodrome Forecast (TAF) for KNQX
toggle option: (graph/table)
Terminal Aerodrome Forecast (TAF) for KNQX
Wind History graph: NQX
(wind in knots)Key Lois
Click for Map
Wed -- 12:12 AM EDT Moonset
Wed -- 01:47 AM EDT 2.08 feet High Tide
Wed -- 02:06 AM EDT First Quarter
Wed -- 07:10 AM EDT Sunrise
Wed -- 10:11 AM EDT 0.40 feet Low Tide
Wed -- 02:39 PM EDT Moonrise
Wed -- 04:42 PM EDT 1.20 feet High Tide
Wed -- 07:33 PM EDT Sunset
Wed -- 07:56 PM EDT 0.80 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:12 AM EDT Moonset
Wed -- 01:47 AM EDT 2.08 feet High Tide
Wed -- 02:06 AM EDT First Quarter
Wed -- 07:10 AM EDT Sunrise
Wed -- 10:11 AM EDT 0.40 feet Low Tide
Wed -- 02:39 PM EDT Moonrise
Wed -- 04:42 PM EDT 1.20 feet High Tide
Wed -- 07:33 PM EDT Sunset
Wed -- 07:56 PM EDT 0.80 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Key Lois, southeast end, Florida, Tide feet
| 12 am |
| 1.8 |
| 1 am |
| 2 |
| 2 am |
| 2.1 |
| 3 am |
| 2 |
| 4 am |
| 1.8 |
| 5 am |
| 1.5 |
| 6 am |
| 1.2 |
| 7 am |
| 0.9 |
| 8 am |
| 0.6 |
| 9 am |
| 0.5 |
| 10 am |
| 0.4 |
| 11 am |
| 0.4 |
| 12 pm |
| 0.6 |
| 1 pm |
| 0.8 |
| 2 pm |
| 0.9 |
| 3 pm |
| 1.1 |
| 4 pm |
| 1.2 |
| 5 pm |
| 1.2 |
| 6 pm |
| 1.1 |
| 7 pm |
| 0.9 |
| 8 pm |
| 0.8 |
| 9 pm |
| 0.9 |
| 10 pm |
| 1 |
| 11 pm |
| 1.3 |
Bahía Honda Harbor (Bridge) Florida Current
Click for Map
Wed -- 12:03 AM EDT 0.00 knots Slack
Wed -- 12:11 AM EDT Moonset
Wed -- 01:39 AM EDT 0.41 knots Max Flood
Wed -- 02:06 AM EDT First Quarter
Wed -- 03:21 AM EDT -0.00 knots Slack
Wed -- 07:10 AM EDT Sunrise
Wed -- 08:24 AM EDT -1.68 knots Max Ebb
Wed -- 12:25 PM EDT 0.00 knots Slack
Wed -- 02:38 PM EDT Moonrise
Wed -- 02:49 PM EDT 0.96 knots Max Flood
Wed -- 06:40 PM EDT -0.00 knots Slack
Wed -- 07:32 PM EDT Sunset
Wed -- 09:53 PM EDT -1.04 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:03 AM EDT 0.00 knots Slack
Wed -- 12:11 AM EDT Moonset
Wed -- 01:39 AM EDT 0.41 knots Max Flood
Wed -- 02:06 AM EDT First Quarter
Wed -- 03:21 AM EDT -0.00 knots Slack
Wed -- 07:10 AM EDT Sunrise
Wed -- 08:24 AM EDT -1.68 knots Max Ebb
Wed -- 12:25 PM EDT 0.00 knots Slack
Wed -- 02:38 PM EDT Moonrise
Wed -- 02:49 PM EDT 0.96 knots Max Flood
Wed -- 06:40 PM EDT -0.00 knots Slack
Wed -- 07:32 PM EDT Sunset
Wed -- 09:53 PM EDT -1.04 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Bahia Honda Harbor (Bridge) Florida Current, knots
| 12 am |
| -0 |
| 1 am |
| 0.3 |
| 2 am |
| 0.4 |
| 3 am |
| 0.1 |
| 4 am |
| -0.2 |
| 5 am |
| -0.6 |
| 6 am |
| -1 |
| 7 am |
| -1.4 |
| 8 am |
| -1.7 |
| 9 am |
| -1.6 |
| 10 am |
| -1.4 |
| 11 am |
| -0.9 |
| 12 pm |
| -0.3 |
| 1 pm |
| 0.4 |
| 2 pm |
| 0.8 |
| 3 pm |
| 1 |
| 4 pm |
| 0.8 |
| 5 pm |
| 0.6 |
| 6 pm |
| 0.3 |
| 7 pm |
| -0.2 |
| 8 pm |
| -0.6 |
| 9 pm |
| -1 |
| 10 pm |
| -1 |
| 11 pm |
| -0.9 |
Key West, FL,
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