Marine Weather and Tide Forecast for Big Coppitt Key, FL
March 18, 2024 11:17 PM EDT (03:17 UTC) Change Location
Sunrise 7:31 AM Sunset 7:38 PM Moonrise 1:01 PM Moonset 2:28 AM |
GMZ035 Expires:202403190830;;982923 Fzus52 Kkey 190229 Cwfkey
coastal waters forecast for the florida keys national weather service key west fl 1029 pm edt Mon mar 18 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.
gmz032-035-190830- 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- 1029 pm edt Mon mar 18 2024
.small craft advisory in effect - .
Overnight - Northwest winds near 10 knots, becoming north near 20 knots late. Seas 1 to 2 feet, building to 2 to 4 feet. NEarshore waters a light chop, becoming rough. Scattered showers.
Tuesday - North winds near 20 knots early, becoming north to northeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet, except 3 to 5 feet west of the marquesas keys. NEarshore waters rough, becoming a light to moderate chop. Isolated showers.
Tuesday night - Northeast to east winds 10 to 15 knots. Seas 1 to 3 feet. NEarshore waters a light to moderate chop.
Wednesday - Northeast to east winds 10 to 15 knots. Seas 1 to 2 feet. NEarshore waters a light to moderate chop.
Wednesday night - East winds near 10 knots. Seas 1 to 2 feet. NEarshore waters a light chop.
Thursday - East winds 10 to 15 knots, increasing to near 15 knots. Seas 1 to 2 feet, building to 1 to 3 feet. NEarshore waters a light to moderate chop, becoming a moderate chop. Isolated showers.
Thursday night - East to southeast winds 15 to 20 knots, becoming southeast 20 to 25 knots after midnight. Seas 2 to 3 feet, except 3 to 5 feet west of the marquesas keys. NEarshore waters choppy, becoming very rough. Scattered showers.
Friday - Southeast winds near 20 knots, decreasing to 15 to 20 knots in the afternoon. Seas 2 to 3 feet, except 3 to 5 feet west of the marquesas keys. NEarshore waters rough, becoming choppy. Numerous showers and isolated Thunderstorms.
Friday night - South to southwest winds near 15 knots, becoming west after midnight. Seas 1 to 3 feet, except 3 to 4 feet west of the marquesas keys. NEarshore waters a moderate chop. Scattered showers and isolated Thunderstorms.
Saturday - West to northwest winds 10 to 15 knots. Seas 1 to 3 feet. NEarshore waters a light to moderate chop. Scattered showers and isolated Thunderstorms.
Saturday night - North winds near 15 knots. Seas 2 to 3 feet. NEarshore waters a moderate chop. Isolated showers and Thunderstorms.
coastal waters forecast for the florida keys national weather service key west fl 1029 pm edt Mon mar 18 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.
gmz032-035-190830- 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- 1029 pm edt Mon mar 18 2024
GMZ005 Synopsis For Keys Coastal Waters From Ocean Reef To Dry Tortugas 1029 Pm Edt Mon Mar 18 2024
Synopsis - Northerly breezes will freshen sharply tonight as a cold front pushes through the coastal waters of the florida keys. Breezes will turn easterly and diminish Tuesday through Wednesday. Unsettled weather at the end of the week will result in fresh to strong breezes Thursday night and Friday, followed by breezes shifting to the southwest then northwest at the tail-end of the unsettled weather.
the approximate shoreward edge of the gulf stream is currently unavailable.
the approximate shoreward edge of the gulf stream is currently unavailable.
Area Discussion for - Key West, FL
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FXUS62 KKEY 190237 AFDKEY
Area Forecast Discussion National Weather Service Key West FL 1037 PM EDT Mon Mar 18 2024
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 955 PM EDT Mon Mar 18 2024 Water vapor imagery highlights a Rex Block across the CONUS, although the 00Z RAOBs sampled rising heights within the cutoff low meaning the Rex may be breaking. At 925 mb, Slidell sampled a temperature almost 25 degreesC lower than Key West, and Freeze Warnings are in effect for the northern Gulf Coast. For middle to late March, this is a pretty good air mass gradient. Surface observations place a cold front over the eastern Gulf of Mexico and Central Florida. Northerly breezes are near Gale (28-33 kt) at the offshore oil platforms behind the front. The Keys remain in a little col region between the warm conveyor emanating from western Cuba, and the frontally forced convection dying out over the southeastern Gulf. The Cuban Boomers are happy near the coast, but seem to be struggling with the Cuban shadow (sampled by KEY)
lurking farther north in the Straits of Florida. The forecast calls for 30% rain chances overnight, which is notably below the MOS consensus. The main forecast challenge is assessing the moisture convergence between the percolating Cuban Boomers and the developing northwesterly breezes. By dawn, northwest to north winds will increase to near 20 knots, which should set up a good scenario for a broken line of convection over the Straits after midnight. Aside from introducing a Small Craft Advisory for the expected winds, we will hold at 30% rain chances as we expect the best convergence to be south of the island chain. No other changes are needed with the inherited forecast.
MARINE
Issued at 955 PM EDT Mon Mar 18 2024 Small Craft Advisory in effect for all coastal waters of the Florida Keys due to north winds increasing to near 20 knots after midnight. Northerly breezes will freshen sharply tonight as a cold front pushes through the coastal waters of the Florida Keys.
Breezes will turn easterly and diminish Tuesday through Wednesday.
Unsettled weather at the end of the week will result in fresh to strong breezes Thursday night and Friday, followed by breezes shifting to the southwest then northwest at the tail-end of the unsettled weather.
AVIATION
(00Z TAFS)
Issued at 955 PM EDT Mon Mar 18 2024 The merging of a cold front with showers spreading northeast through the Straits of Florida will introduce a short window of VCSH at both terminals overnight. Forecast soundings suggest northerly crosswinds will reach 20 to 25 knots around sunrise, along with a brief period of TEMPO MVFR CIGS. Winds will shift east of north and decrease after 16Z.
PRELIMINARY POINT TEMPS/POPS
Key West 72 77 69 79 / 30 10 0 10 Marathon 72 79 69 80 / 30 10 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory for GMZ031>035- 042>044-052>055-072>075.
Area Forecast Discussion National Weather Service Key West FL 1037 PM EDT Mon Mar 18 2024
New DISCUSSION, MARINE, AVIATION
DISCUSSION
Issued at 955 PM EDT Mon Mar 18 2024 Water vapor imagery highlights a Rex Block across the CONUS, although the 00Z RAOBs sampled rising heights within the cutoff low meaning the Rex may be breaking. At 925 mb, Slidell sampled a temperature almost 25 degreesC lower than Key West, and Freeze Warnings are in effect for the northern Gulf Coast. For middle to late March, this is a pretty good air mass gradient. Surface observations place a cold front over the eastern Gulf of Mexico and Central Florida. Northerly breezes are near Gale (28-33 kt) at the offshore oil platforms behind the front. The Keys remain in a little col region between the warm conveyor emanating from western Cuba, and the frontally forced convection dying out over the southeastern Gulf. The Cuban Boomers are happy near the coast, but seem to be struggling with the Cuban shadow (sampled by KEY)
lurking farther north in the Straits of Florida. The forecast calls for 30% rain chances overnight, which is notably below the MOS consensus. The main forecast challenge is assessing the moisture convergence between the percolating Cuban Boomers and the developing northwesterly breezes. By dawn, northwest to north winds will increase to near 20 knots, which should set up a good scenario for a broken line of convection over the Straits after midnight. Aside from introducing a Small Craft Advisory for the expected winds, we will hold at 30% rain chances as we expect the best convergence to be south of the island chain. No other changes are needed with the inherited forecast.
MARINE
Issued at 955 PM EDT Mon Mar 18 2024 Small Craft Advisory in effect for all coastal waters of the Florida Keys due to north winds increasing to near 20 knots after midnight. Northerly breezes will freshen sharply tonight as a cold front pushes through the coastal waters of the Florida Keys.
Breezes will turn easterly and diminish Tuesday through Wednesday.
Unsettled weather at the end of the week will result in fresh to strong breezes Thursday night and Friday, followed by breezes shifting to the southwest then northwest at the tail-end of the unsettled weather.
AVIATION
(00Z TAFS)
Issued at 955 PM EDT Mon Mar 18 2024 The merging of a cold front with showers spreading northeast through the Straits of Florida will introduce a short window of VCSH at both terminals overnight. Forecast soundings suggest northerly crosswinds will reach 20 to 25 knots around sunrise, along with a brief period of TEMPO MVFR CIGS. Winds will shift east of north and decrease after 16Z.
PRELIMINARY POINT TEMPS/POPS
Key West 72 77 69 79 / 30 10 0 10 Marathon 72 79 69 80 / 30 10 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...None.
GM...Small Craft Advisory for GMZ031>035- 042>044-052>055-072>075.
Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
KYWF1 - 8724580 - Key West, FL | 15 mi | 47 min | NNW 8.9G | 79°F | 82°F | 29.96 | ||
SANF1 - Sand Key, FL | 20 mi | 27 min | NW 8.9G | 79°F | 29.96 | 73°F | ||
SMKF1 - Sombrero Key, FL | 23 mi | 27 min | 29.93 | |||||
42095 | 25 mi | 47 min | 79°F | 80°F | 1 ft | |||
VCAF1 - 8723970 - Vaca Key, FL | 25 mi | 47 min | NW 9.9G | 81°F | 84°F | |||
LONF1 - Long Key, FL | 41 mi | 27 min | WNW 13G | 81°F | 29.91 | 75°F |
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Airport Reports
EDIT (hide/show)  Help Click EDIT to display multiple airports. Follow links for more data.Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
KNQX KEY WEST NAS /BOCA CHICA FIELD/,FL | 9 sm | 24 min | NNW 09 | 10 sm | Clear | 82°F | 75°F | 79% | 29.95 | |
KEYW KEY WEST INTL,FL | 12 sm | 24 min | NNW 09 | 10 sm | Clear | 81°F | 75°F | 84% | 29.95 |
Tide / Current for Key Lois, southeast end, Florida
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Key Lois
Click for Map
Mon -- 03:28 AM EDT Moonset
Mon -- 06:12 AM EDT 0.72 feet High Tide
Mon -- 07:31 AM EDT Sunrise
Mon -- 09:35 AM EDT 0.44 feet Low Tide
Mon -- 02:00 PM EDT Moonrise
Mon -- 04:16 PM EDT 1.56 feet High Tide
Mon -- 07:36 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 03:28 AM EDT Moonset
Mon -- 06:12 AM EDT 0.72 feet High Tide
Mon -- 07:31 AM EDT Sunrise
Mon -- 09:35 AM EDT 0.44 feet Low Tide
Mon -- 02:00 PM EDT Moonrise
Mon -- 04:16 PM EDT 1.56 feet High Tide
Mon -- 07:36 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Key Lois, southeast end, Florida, Tide feet
12 am |
-0 |
1 am |
0.1 |
2 am |
0.3 |
3 am |
0.4 |
4 am |
0.6 |
5 am |
0.7 |
6 am |
0.7 |
7 am |
0.7 |
8 am |
0.6 |
9 am |
0.5 |
10 am |
0.4 |
11 am |
0.6 |
12 pm |
0.8 |
1 pm |
1 |
2 pm |
1.3 |
3 pm |
1.5 |
4 pm |
1.6 |
5 pm |
1.5 |
6 pm |
1.4 |
7 pm |
1.2 |
8 pm |
0.9 |
9 pm |
0.6 |
10 pm |
0.3 |
11 pm |
0.1 |
Bahía Honda Harbor (Bridge) Florida Current
Click for Map
Mon -- 01:21 AM EDT 0.00 knots Slack
Mon -- 03:28 AM EDT Moonset
Mon -- 04:58 AM EDT 0.90 knots Max Flood
Mon -- 07:30 AM EDT Sunrise
Mon -- 07:38 AM EDT -0.00 knots Slack
Mon -- 11:03 AM EDT -1.13 knots Max Ebb
Mon -- 01:59 PM EDT Moonrise
Mon -- 02:40 PM EDT 0.00 knots Slack
Mon -- 05:06 PM EDT 0.22 knots Max Flood
Mon -- 06:32 PM EDT -0.00 knots Slack
Mon -- 07:35 PM EDT Sunset
Mon -- 11:02 PM EDT -1.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 01:21 AM EDT 0.00 knots Slack
Mon -- 03:28 AM EDT Moonset
Mon -- 04:58 AM EDT 0.90 knots Max Flood
Mon -- 07:30 AM EDT Sunrise
Mon -- 07:38 AM EDT -0.00 knots Slack
Mon -- 11:03 AM EDT -1.13 knots Max Ebb
Mon -- 01:59 PM EDT Moonrise
Mon -- 02:40 PM EDT 0.00 knots Slack
Mon -- 05:06 PM EDT 0.22 knots Max Flood
Mon -- 06:32 PM EDT -0.00 knots Slack
Mon -- 07:35 PM EDT Sunset
Mon -- 11:02 PM EDT -1.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Bahia Honda Harbor (Bridge) Florida Current, knots
12 am |
-0.9 |
1 am |
-0.2 |
2 am |
0.3 |
3 am |
0.7 |
4 am |
0.8 |
5 am |
0.9 |
6 am |
0.8 |
7 am |
0.3 |
8 am |
-0.2 |
9 am |
-0.7 |
10 am |
-1 |
11 am |
-1.1 |
12 pm |
-1 |
1 pm |
-0.6 |
2 pm |
-0.2 |
3 pm |
0.1 |
4 pm |
0.2 |
5 pm |
0.2 |
6 pm |
0.1 |
7 pm |
-0.2 |
8 pm |
-0.7 |
9 pm |
-1.2 |
10 pm |
-1.6 |
11 pm |
-1.7 |
Key West, FL,
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