Wednesday, April21, 2021
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Marine Weather and Tides
Callahan, FL

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:50AMSunset 7:59PM Wednesday April 21, 2021 6:35 AM EDT (10:35 UTC) Moonrise 1:13PMMoonset 2:30AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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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AMZ452 Expires:202104212130;;880129 Fzus52 Kjax 210705 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 305 Am Edt Wed Apr 21 2021 Atlantic Coastal Waters From Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm. Seas Are Provided As A Range Of The Average Height Of The Highest 1/3 Of The Waves, Along With The Occasional Height Of The Average Highest 1/10 Of The Waves. Amz450-452-454-212130- Coastal Waters From Altamaha Sound To Fernandina Beach Fl Out 20 Nm- Coastal Waters From Fernandina Beach To St. Augustine Fl Out 20 Nm- Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 305 Am Edt Wed Apr 21 2021
.small craft advisory in effect from this evening through Thursday morning...
Today..West winds 5 to 10 knots increasing to 10 to 15 knots late in the afternoon. Seas 2 to 3 feet with a dominant period 6 seconds. A moderate chop on the intracoastal waters.
Tonight..Northwest winds 15 to 20 knots becoming north 20 knots after midnight. Seas 3 to 4 feet with a dominant period 6 seconds. Choppy on the intracoastal waters.
Thursday..Northeast winds 15 to 20 knots diminishing to 10 to 15 knots in the afternoon. Seas 3 to 4 feet with a dominant period 5 seconds. Choppy on the intracoastal waters.
Thursday night..East winds 5 to 10 knots. Seas 2 to 3 feet. Mostly smooth on the intracoastal waters.
Friday..East winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. A moderate chop on the intracoastal waters.
Friday night..Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Chance of showers and slight chance of Thunderstorms.
Saturday..South winds 15 to 20 knots. Seas 4 to 6 feet. Chance of showers and slight chance of Thunderstorms.
Saturday night..Southwest winds 15 to 20 knots. Seas 4 to 6 feet. Chance of showers and slight chance of Thunderstorms.
Sunday..Northwest winds 10 to 15 knots becoming north in the afternoon. Seas 3 to 4 feet.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 305 Am Edt Wed Apr 21 2021
Synopsis.. A dry cold front will cross the waters this afternoon and evening, which will cause westerly winds to shift to northerly tonight and increase to 20-25 knots with higher gusts possible. Small craft advisories will be in effect for nearshore and offshore waters from 10 pm tonight through 10 am Thursday morning. High pressure will build to the northwest on Thursday, then to the north on Friday. Shower and Thunderstorm chances will increase Friday night as a warm front lifts across the waters, and will continue Saturday as a cold front approaches from the northwest. The cold front will cross the waters Saturday night, then high pressure will build again to the north early next week.
Gulf stream.. The approximate location of the west wall of the gulf stream as of apr 20, 2021 at 1200 utc... 67 nautical miles east of flagler beach. 76 nautical miles east of saint augustine beach. 84 nautical miles east of jacksonville beach. 92 nautical miles east southeast of st simons island. This data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near Callahan, FL
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location: 30.56, -81.74     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 210756 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 356 AM EDT Wed Apr 21 2021

NEAR TERM [Through Tonight].

Patchy fog and low stratus have moved in from the Gulf of Mexico this morning over Marion County and along the St. Johns River basin south of Jacksonville. Patchy fog and stratus are expected to clear up shortly after sunrise this morning. A warm, sunny, and dry day is expected across the area with high temperatures in the upper 70s to middle 80s. Winds will become breezy today as a cold front approaches from the northwest and crosses the area this afternoon and evening. No rainfall is expected with the frontal passage, but temperatures and humidity will fall behind the front. Overnight low temperatures will drop into the lower 40s in SE GA and middle 40s to upper 50s in NE FL. This could be near the top 10 largest 24 hour temperature changes on record for April at our local climate sites (see CLIMATE section below).

SHORT TERM [Thursday Through Friday].

Thursday . High pressure will build to the north northwest and will bring another dry and sunny day with less wind than Wednesday. High temperatures will be in the 70s at inland locations, but onshore winds will cause breezy conditions along the coast and slightly cooler highs in the upper 60s. Light winds Thursday night, mostly clear skies, and high pressure subsidence over the area will allow for good radiative cooling and will bring another night of cool temperatures. Overnight lows are expected to be in the 40s and 50s again, but a couple degrees warmer than Wednesday night.

Friday . High pressure to the north northeast will stick around through the day, and cloud cover will begin to increase ahead of the next frontal system. High temperatures will be in the middle 70s to lower 80s. Rain and thunderstorm chances will increase Friday night in SE GA as a warm front lifts northeast across the area from the Gulf of Mexico. Friday night low temperatures will be warmer in the upper 50s to middle 60s.

LONG TERM [Saturday Through Tuesday].

Saturday . Models in good agreement for a rather vigorous shortwave trof in the zonal flow that will develop a low pressure on the frontal boundary over the SE US just Northwest of the region and drag another cold front through the region by Saturday Night. Models still differ on track of this low, but expect at least numerous showers with scattered storms possible Saturday afternoon and evening, some of which could be strong to severe with all Hazards possible (Damaging Winds, Hail, Isolated Tornado and heavy rainfall), mainly across inland SE GA and the Suwannee River Valley of inland North Florida. Breezy southerly flow on Saturday should push Max Temps back into the 80s with overnight lows Sat Night only in the upper 50s SE GA and into the 60s across NE FL.

Sunday . Trailing cold frontal passage will continue a few showers around in the morning hours but otherwise still expect clearing skies and drier airmass by the afternoon hours into Sunday Night with seasonable Max Temps around 80 degrees and Min Temps falling back into the 50s for Sunday Night. Monday . High pressure builds into the Carolinas and surface flow becomes onshore from the East to Northeast and breezy at the Atlc Coast with lesser winds inland and as long as the frontal boundary sinks southward and washes out across South Florida the atmosphere remains dry enough to prevent any shower activity and expect Mostly Sunny and pleasant late April Max Temps in the lower 80s inland and middle 70s along the Atlc Coast. Low temps will remain in the 50s inland and lower 60s coast.

Tuesday . High pressure builds further into the Wrn Atlc and surface flow becomes East to Southeast and continues to be breezy along the Atlc Coast with a slight moderation in temps into the lower to middle 80s over inland areas and upper 70s along the Atlc Coast under Sunny skies. Low Temps Tuesday Night only fall into the upper 50s inland and remain in the 60s along the Atlc Coast.

AVIATION. [Through 06Z Thursday]

Weak surface trough and low level convergence over inland NE FL and inland SE GA just west of the TAF sites has been producing some random low and mid level clouds (mostly VFR levels) along with some isolated showers across SE GA that will fade over the next several hours. The westerly steering flow off the surface should push this feature eastward across the TAF sites in the 06-12z time frame and will make for a just a few clouds at times mostly in the 2500-4000 ft range so have placed these at all TAF sites, along with very light flow at the surface and some 6SM FOG possible in the low level moisture in this time frame as well, with likely only the usual "trashy" MVFR VSBYS possible at VQQ in the 7-11Z time frame with all other sites likely remaining VFR. After 12z this feature should push east of the TAF sites with West to Northwest winds increasing to 10-13 knots with gusts of 15-20 knots at times by the 14-16z time frame with skies becoming mostly SKC. Winds decrease after sunset to 6-8 knots from the Northwest with the more significant increase from the North occurring after the current time period around 06z.

MARINE.

A dry cold front will cross the waters this afternoon and evening, which will cause westerly winds to shift to northerly tonight and increase to 20-25 knots with higher gusts possible. Small Craft Advisories will be in effect for nearshore and offshore waters from 10 PM tonight through 10 AM Thursday morning. High pressure will build to the northwest on Thursday, then to the north on Friday. Shower and thunderstorm chances will increase Friday night as a warm front lifts across the waters, and will continue Saturday as a cold front approaches from the northwest. The cold front will cross the waters Saturday night, then high pressure will build again to the north early next week.

Rip Currents: Low Risk at all area beaches today, increasing to Moderate Risk Thursday.

FIRE WEATHER.

Elevated Fire Danger Today.

Patchy fog in Marion County and near the St. Johns River Basin south of Jacksonville this morning. A cold front will cross the area this afternoon and evening, which will cause elevated winds with gusts up to 25 mph and near critical minimum relative humidities. Elevated transport winds will result in high dispersions. This will cause elevated fire danger today. Relative humidity will be critically low on Thursday, but winds will be lighter. Dry weather is expected today and Thursday.

HYDROLOGY.

Portions of the Santa Fe basin including near O'Leno State Park and Worthington Springs are in Action Stage and are expected to crest just below Minor Flood Stage Wednesday night or early Thursday.

CLIMATE.

Colder airmass arriving tonight will make for close to a 35 to 40 degree drop in temps from this afternoon Max Temps in the 80s to Thursday Morning lows in the 40s and this 24 hour temp change would be ranked as a Top 10 event for the month of April at the local climate sites, the all-time record 24 hour temperature changes for April are listed below.

Jacksonville FL (JAX) - 46F drop from 4pm (83F) on 4/8 to 7am (37F) on 4/9 in 2000 Gainesville FL (GNV) - 42F drop from 5pm (81F) on 4/8 to 7am (39F) on 4/9 in 2000 St Simons Island (SSI)- 40F drop from 4pm (80F) on 4/8 to 7am (40F) on 4/9 in 2000

PRELIMINARY POINT TEMPS/POPS.

AMG 81 41 70 44 76 / 0 0 0 0 10 SSI 83 50 67 54 73 / 0 0 0 0 10 JAX 85 48 70 52 76 / 0 0 0 0 10 SGJ 84 54 68 56 75 / 0 0 0 0 10 GNV 83 49 74 50 81 / 0 0 0 0 10 OCF 85 49 77 53 83 / 0 0 0 0 10

JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . Small Craft Advisory from 10 PM this evening to 10 AM EDT Thursday for Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM-Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM-Coastal waters from St. Augustine to Flagler Beach FL out 20 NM- Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM-Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NFDF1 13 mi48 min WSW 4.1 G 5.1 65°F 1013.9 hPa64°F
DMSF1 15 mi48 min 71°F
BLIF1 16 mi48 min SW 4.1 G 5.1 67°F 1014.9 hPa67°F
JXUF1 16 mi48 min 72°F
FRDF1 - 8720030 - Fernandina Beach, FL 17 mi48 min SW 4.1 G 6 69°F 69°F1014 hPa
LTJF1 20 mi48 min 65°F 63°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 20 mi48 min WSW 6 G 7 66°F 68°F1014.3 hPa
41112 - Offshore Fernandina Beach, FL (132) 26 mi66 min 67°F 68°F2 ft
BKBF1 26 mi48 min 65°F 1014.2 hPa
SAUF1 - St. Augustine, FL 55 mi36 min W 5.1 G 7 66°F 70°F1014.6 hPa (+0.8)66°F
SAXG1 - Sapelo Island Reserve, GA 64 mi96 min S 1.9 62°F 1013 hPa (-1.0)62°F

Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Jacksonville International Airport, FL5 mi40 minSW 410.00 miA Few Clouds59°F59°F100%1014.1 hPa
Fernandina Beach Municipal Airport, FL15 mi61 minWSW 510.00 miFair64°F0°F%1013.9 hPa
Jacksonville Craig Municipal Airport, FL20 mi43 minN 09.00 miFair63°F60°F90%1014.1 hPa
Mayport Naval Station - Adm David L. McDonald Field, FL20 mi44 minWSW 410.00 miA Few Clouds65°F63°F93%1013.9 hPa
Jacksonville Naval Air Station, FL23 mi43 minW 710.00 miPartly Cloudy64°F61°F90%1013.9 hPa

Link to 5 minute data for KJAX

Wind History from JAX (wind in knots)
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Last 24hrNE3S4N4CalmE7NE10NE8
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1 day agoW6W6NW8N8NW12NW76W8NW7
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2 days agoSW4CalmS7W3SW5SW6W5W7W9W7SW4W6SW5W4W3SE3SW4W4CalmW4W5W6W6W7

Tide / Current Tables for Boggy Creek, 2 mi. above entrance, Florida
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Boggy Creek
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Wed -- 01:29 AM EDT     0.90 feet Low Tide
Wed -- 03:30 AM EDT     Moonset
Wed -- 06:52 AM EDT     Sunrise
Wed -- 07:34 AM EDT     2.99 feet High Tide
Wed -- 02:12 PM EDT     Moonrise
Wed -- 02:18 PM EDT     0.86 feet Low Tide
Wed -- 07:58 PM EDT     Sunset
Wed -- 08:10 PM EDT     2.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.90.91.21.72.32.72.932.82.41.91.41.10.90.91.31.72.22.62.72.62.41.9

Tide / Current Tables for St. Johns River Entrance, Florida Current (3)
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St. Johns River Entrance
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Wed -- 12:37 AM EDT     0.00 knots Slack
Wed -- 03:30 AM EDT     Moonset
Wed -- 03:43 AM EDT     1.94 knots Max Flood
Wed -- 06:49 AM EDT     -0.00 knots Slack
Wed -- 06:51 AM EDT     Sunrise
Wed -- 09:13 AM EDT     -1.49 knots Max Ebb
Wed -- 01:48 PM EDT     0.00 knots Slack
Wed -- 02:11 PM EDT     Moonrise
Wed -- 04:13 PM EDT     1.63 knots Max Flood
Wed -- 07:06 PM EDT     -0.00 knots Slack
Wed -- 07:58 PM EDT     Sunset
Wed -- 09:31 PM EDT     -1.53 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.20.91.71.91.50.8-0.2-1.1-1.5-1.4-1.1-0.8-0.40.21.11.61.50.90.1-0.9-1.5-1.5-1.2

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