Monday, January25, 2021
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Marine Weather and Tides
Key Biscayne, FL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:05AMSunset 6:00PM Monday January 25, 2021 3:24 PM EST (20:24 UTC) Moonrise 3:12PMMoonset 4:28AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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AMZ630 Biscayne Bay- 916 Am Est Mon Jan 25 2021
Today..Southeast winds 10 to 15 knots. Bay waters a moderate chop.
Tonight..South southeast winds around 10 knots. Bay waters a light chop.
Tuesday..South southeast winds around 10 knots. Bay waters a light chop.
Tuesday night..South southeast winds 5 to 10 knots. Bay waters a light chop.
Wednesday..South southwest winds around 10 knots. Bay waters a light chop.
Wednesday night..West winds around 10 knots. Bay waters a light chop.
Thursday and Thursday night..North northeast winds 10 to 20 knots with gusts to around 25 knots. Bay waters choppy.
Friday..Northeast winds 10 to 15 knots with gusts to around 20 knots. Bay waters a moderate chop.
AMZ600 Synopsis For Jupiter Inlet To Ocean Reef Fl Out To 60 Nm And For East Cape Sable To Bonita Beach Fl Out To 60 Nm- 916 Am Est Mon Jan 25 2021
Synopsis..High pressure is now building across the coastal waters, bringing increasing se to sse winds. Small craft operators should exercise caution today over the atlantic waters. A cold front is forecast to move down the florida peninsula Wednesday night and through the local waters on Thursday, accompanied by deteriorating marine conditions for the latter part of the week.
Gulf stream hazards..None the approximate location of the west wall of the gulf stream as of jan 23, 2021 at 1200 utc... 14 nautical miles southeast of fowey rocks. 21 nautical miles east southeast of port everglades. 12 nautical miles east southeast of lake worth. 21 nautical miles east southeast of jupiter inlet. This data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near Key Biscayne, FL
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location: 25.7, -80.17     debug


Area Discussion for - Miami-South Florida, FL
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FXUS62 KMFL 252008 AFDMFL

Area Forecast Discussion National Weather Service Miami FL 308 PM EST Mon Jan 25 2021

SHORT TERM (Rest of Today and Tuesday).

A broad, elongated upper ridge remains entrenched over the western Atlantic Ocean, with South Florida being influenced by the western periphery of a stout surface ridge. The 12Z MFL sounding reveals several stout subsidence inversions, both at 850 and 700 hPa, indicative of strong mid-level ridging influencing the region. Given the influence of aforementioned features, mostly dry weather is expected through at least the next few days, with modest southeast/southerly flow over the region.

With winds forecast to become light and variable overnight and dewpoints to remain in the mid/upper 60s, fog formation will be a forecast concern to monitor through the early morning hours Tuesday. With a strong radiation inversion and light surface flow, patchy fog is possible over interior and western portions of South Florida. Short-range model guidance indicates a strong signal over northwestern Collier County, as well as western portion of Glades and Hendry County. These areas appear to be the most prone to locally dense fog formation. Any fog development should quickly dissipate around sunrise Tuesday.

Temperatures will remain seasonably warm, with a slight warming trend of high temperatures into the lower/mid 80s tomorrow. This should linger through Wednesday, where a cold front is forecast to bring mild relief later in the week.

LONG TERM (Tuesday Night through Monday).

As the sun dawns on the extended period, a shortwave complex will be traversing eastward across the midwest, while high pressure at the surface will be centered over the western Atlantic, holding a boundary stationary over the southeast CONUS. A surface low will eventually develop as the upper level complex continues over the mid- Atlantic states late Wednesday into early Thursday and interacts with the stationary boundary. As the surface low deepens and ejects offshore, the aforementioned boundary should gain southward momentum as an attendant cold front and move across South Florida on Thursday. Favorable dynamics for deep convection will quickly decouple from the boundary and allow for only a feeble line of showers ahead and along the FROPA.

Behind the front, the pressure gradient over the area tightens, while the flow quickly veers out of the NNE. This will result in a few hazards to monitor with each forecast cycle. The first being fire weather concerns, which could become realized on Thursday afternoon as dry air filters into the region coincident with elevated northerly winds in the boundary layer. Additionally, building seas could result in hazardous marine conditions for the local waters, while elevated onshore flow could result in an elevated rip current risk for the east coast beaches of South Florida.

Temperature-wise, with the return of an easterly component, this will help to quickly moderate the airmass, limiting the potential for colder temperatures to stick around. Coldest temperatures will be Thursday night into Friday morning in the mid to upper 40s across the western half of our area and 50s for the eastern portion. Daytime highs will be in the lower-mid 70s Thursday and Friday behind the FROPA and warm back up into the upper 70s, near 80 by the weekend.

AVIATION(18Z TAFS). The influence of high pressure will result in predominately VFR conditions over the region. Intermittent MVFR cigs may develop this afternoon, especially over the Atlantic coast/metro, which has been handled with TEMPO groups for now. Overnight, IFR/LIFR conditions are possible over southwest Florida due to patchy/locally dense fog. Winds generally SE/SSE through the TAF period.

MARINE. Broad high pressure will allow for generally benign boating conditions. Modest SE/SSE flow should persist through mid week. An approaching front later in the week may result in deteriorating marine conditions, as a fetch of NW winds acts to increase surf heights. Swell activity may develop downstream of the front as well, which could persist into the weekend.

FIRE WEATHER. Enhanced fire weather concerns are possible on Thursday behind a late week cold frontal passage. Relative humidity values are forecast to fall below critical thresholds (RHs less than 35%) Thursday afternoon with 20-foot winds near 15 mph.

BEACHES. A high risk for rip currents is in effect for coastal Palm Beach County through Tuesday evening, as modest SE/SSE flow of roughly 15 kts persists through the afternoon. This flow becomes slightly weaker into Broward/Miami-Dade Counties, and hence a moderate risk for rip currents is effect for these areas. An approaching front later this week may result in a high risk for rip currents across the region.

PRELIMINARY POINT TEMPS/POPS. Miami 70 83 69 84 / 0 0 0 0 West Kendall 67 84 67 85 / 0 0 0 0 Opa-Locka 67 82 67 84 / 0 0 0 0 Homestead 67 82 68 83 / 0 0 0 0 Fort Lauderdale 69 83 69 84 / 0 0 0 0 N Ft Lauderdale 69 81 69 83 / 0 0 0 0 Pembroke Pines 68 84 68 85 / 0 0 0 0 West Palm Beach 67 82 66 84 / 0 0 0 0 Boca Raton 68 83 68 85 / 0 0 0 0 Naples 65 80 64 79 / 0 0 0 0

MFL WATCHES/WARNINGS/ADVISORIES. FL . High Rip Current Risk through Tuesday evening for FLZ168.

AM . None. GM . None.



Tonight/Tuesday and Aviation/Marine/Beaches . Bhatti Tuesday Night through Monday/Fire Weather . HVN

Visit us at weather.gov/miami

Follow us on Facebook and Twitter at: www.facebook.com/nwsmiami www.twitter.com/nwsmiami


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VAKF1 - 8723214 - Virginia Key, FL 2 mi54 min SE 8.9 G 12 75°F 75°F1017.1 hPa
FWYF1 - Fowey Rocks, FL 8 mi24 min SE 14 G 16 74°F 73°F1016.7 hPa (-1.9)
PEGF1 27 mi54 min SE 17 G 19 76°F 1016.8 hPa
MDKF1 31 mi84 min 75°F
HCEF1 - Highway Creek, FL 34 mi84 min 76°F
MNBF1 35 mi84 min 76°F
LSNF1 - Long Sound, FL 36 mi84 min 75°F
LBSF1 - Little Blackwater, FL 36 mi144 min 74°F
THRF1 36 mi144 min 74°F
JBYF1 38 mi84 min 74°F
TCVF1 - Trout Cove, FL 39 mi144 min 76°F
BWSF1 - Blackwater Sound, FL 39 mi144 min 75°F
DKKF1 - Duck Key, FL 40 mi144 min 74°F
TRRF1 - Taylor River, FL 42 mi84 min 75°F
LMDF1 - Little Madeira, FL 44 mi84 min 76°F
CANF1 - Cane Patch, FL 45 mi84 min 71°F
BDVF1 - Broad River, FL 46 mi84 min 71°F
BNKF1 - Butternut Key, FL 46 mi84 min 74°F
NRRF1 47 mi84 min 71°F
TPEF1 - Tarpon Bay East, FL 47 mi144 min 71°F
WIWF1 - Willy Willy, FL 47 mi84 min 73°F
TBYF1 48 mi84 min 78°F
LRIF1 48 mi84 min 76°F

Wind History for Virginia Key, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Miami, Miami International Airport, FL10 mi31 minSE 1110.00 miMostly Cloudy77°F66°F69%1016.5 hPa
Miami, Kendall-Tamiami Executive Airport, FL14 mi31 minSE 12 G 1810.00 miMostly Cloudy80°F65°F60%1016.1 hPa
Miami, Opa Locka Airport, FL16 mi31 minS 13 G 2310.00 miPartly Cloudy79°F64°F60%1016.7 hPa
Homestead Air Reserve Base, FL19 mi28 minSE 1210.00 miPartly Cloudy77°F64°F65%1016.2 hPa
Hollywood, North Perry Airport, FL21 mi31 minSE 14 G 1910.00 miPartly Cloudy79°F64°F60%1016.8 hPa

Link to 5 minute data for KMIA

Wind History from MIA (wind in knots)
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Last 24hrE8SE9SE8SE5SE5SE3E3E3SE3SE3E34SE3E7SE3SE3E4SE7SE12SE13SE15
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1 day agoN4E6E8E5E4E5E3CalmCalmW4W3CalmN3CalmCalmN3CalmNW4N4436CalmSE8
2 days agoSW10W5W6W4W6W6W5CalmW3SW3S5CalmSW4CalmCalmCalmCalmNW3NW5W4NW6NW7NW45

Tide / Current Tables for Key Biscayne Yacht Club, Biscayne Bay, Florida
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Key Biscayne Yacht Club
Click for Map
Mon -- 12:52 AM EST     -0.06 feet Low Tide
Mon -- 04:28 AM EST     Moonset
Mon -- 06:56 AM EST     1.81 feet High Tide
Mon -- 07:06 AM EST     Sunrise
Mon -- 01:29 PM EST     0.30 feet Low Tide
Mon -- 03:12 PM EST     Moonrise
Mon -- 05:59 PM EST     Sunset
Mon -- 06:50 PM EST     1.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0-0.10.10.50.91.41.71.81.71.51.10.80.50.30.30.50.91.31.61.71.51.30.90.5

Tide / Current Tables for Miami Harbor Entrance, Florida Current
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Miami Harbor Entrance
Click for Map
Mon -- 12:47 AM EST     0.00 knots Slack
Mon -- 04:28 AM EST     Moonset
Mon -- 04:37 AM EST     1.67 knots Max Flood
Mon -- 07:06 AM EST     Sunrise
Mon -- 07:23 AM EST     -0.00 knots Slack
Mon -- 11:25 AM EST     -1.00 knots Max Ebb
Mon -- 01:21 PM EST     0.00 knots Slack
Mon -- 03:11 PM EST     Moonrise
Mon -- 04:53 PM EST     1.29 knots Max Flood
Mon -- 05:59 PM EST     Sunset
Mon -- 07:14 PM EST     -0.00 knots Slack
Mon -- 11:23 PM EST     -1.16 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.70.21.11.51.61.61.20.3-0.4-0.7-0.8-1-0.9-0.30.61.21.31.310.2-0.6-1-1.1-1.1

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station




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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.