Friday, January17, 2020
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Marine Weather and Tides
St. Simons, GA

Version 3.4
NOTICE
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 7:23AMSunset 5:48PM Friday January 17, 2020 1:42 PM EST (18:42 UTC) Moonrise 12:21AMMoonset 12:18PM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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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AMZ450 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- 929 Am Est Fri Jan 17 2020
.small craft advisory in effect through late tonight...
Rest of today..Northeast winds 20 to 25 knots with gusts to around 35 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds. Inland waters choppy.
Tonight..East winds 20 to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 9 seconds. Inland waters choppy.
Saturday..South southeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Inland waters a moderate chop.
Saturday night..South southwest winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Inland waters a moderate chop. A chance of showers and a slight chance of Thunderstorms.
Sunday..Southwest winds 10 to 15 knots becoming west northwest in the afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Inland waters a moderate chop. Showers likely and a slight chance of Thunderstorms.
Sunday night through Tuesday..North winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. A chance of showers.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 929 Am Est Fri Jan 17 2020
Synopsis.. The cold front will continue to move south of the area waters this morning. Strong high pressure will be north of the area and move slowly to the east. This pattern will create a pressure gradient and increase winds from the northeast throughout the day with gusts just below gale force over the area waters. On Saturday, high pressure will be to our north and weaken as it moves over the eastern seaboard. This will allow winds to relax over the near shore waters and the small craft advisory will be dropped there early Saturday morning. However, the small craft advisory will persist for the offshore waters until Saturday evening. Another front will approach the area waters overnight Saturday and move over the area waters on Sunday with winds veering from the south and southwest before the front's passage. A good chance of rain is expected on Sunday. Strong high pressure will move in from the northwest on Monday into Tuesday and northerly winds over the area waters along with elevated seas are expected into early next week.
Gulf stream.. The approximate location of the west wall of the gulf stream as of jan 16, 2020 at 1200 utc... 62 nautical miles east of flagler beach. 68 nautical miles east of saint augustine beach. 75 nautical miles east of jacksonville beach. 91 nautical miles east southeast of st simons island. This data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near St. Simons, GA
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location: 31.13, -81.39     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 171734 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 1234 PM EST Fri Jan 17 2020

AVIATION. [Through 18Z Saturday]

VFR conditions will persist into the afternoon, after which MVFR cloud ceilings will begin to develop and impact coastal areas and potentially reach as far inland as GNV, and will then return to VFR conditions by late tonight / early tomorrow morning. Winds will continue to be out of the northeast with speeds reaching up to 15-20 knots with gusts reaching as high as 30-35 knots, before dropping off in the late afternoon and evening hours.

PREV DISCUSSION [1005 AM EST].

NEAR TERM [Through Tonight].

A cold front will continue progressing south of the area. Winds from the north and northeast will be increasing this morning, especially along the NE FL coast where a wind advisory is in effect until this evening for coastal areas of NE FL as winds of 20 to 25 mph with gusts up to 35 mph are expected through early evening. Mostly clear skies this morning will eventually become partly to mostly cloudy as onshore winds behind the front bring in clouds off the atlantic. Dry conditions are expected with possibly a sprinkle along the NE FL coast later this evening. Temperatures will warm into the low to mid 60s across interior SE GA and NE FL with upper 50s along the SE GA coast and upper 60s over north central Florida areas. Low temperatures overnight tonight will be coolest over inland SE GA with low to mid 40s north and west of Waycross, upper 40s to low 50s along the SE GA coast, upper 40s over the Suwannee Valley of NE FL, mid to upper 50s along the NE FL coast, and low to mid 50s over north central Florida.

SHORT TERM [Saturday Through Sunday].

Saturday . High pressure pushes off the Atlc Coast and mild southerly flow develops and pushes Max Temps back above normal with widespread highs in the 70s under partly sunny skies as high clouds increase ahead of the next frontal passage.

Sat Night/Sunday . Next frontal passage expected to push through the region from NW to SE with numerous showers and isolated storms. Rainfall amounts generally in the 0.10"-0.25" range but some isolated higher amounts around 0.50" are expected across the Suwannee River Valley and inland SE GA. Lows ahead of the front will only fall into the 50s Sat Night with highs only rebounding into the 60s on Sunday. Severe Storms are not expected with this frontal passage at this time.

Sunday Night . Gusty Northwest winds at 10-15 mph and strong cold air advection will push lows into the 30s inland by Monday Morning, but should remain just above freezing, while coastal areas will fall into the lower 40s. Wind chill values will fall into the upper 20s/lower 30s for many locations by sunrise Monday morning but likely expected to remain just above Advisory criteria.

LONG TERM [Monday Through Friday].

Cold High pressure will build Northwest of the region and colder and drier airmass will settle in the region with highs only in the 50s and a widespread freeze expected across inland SE GA/inland NE FL with lows in the upper 20s, while coastal areas will likely bottom out in the 30s just above freezing both Tuesday and Wednesday Mornings. High pressure then builds to the Carolinas and expect onshore flow to develop with a slow warm-up through the end of the week as highs climb back to near normal levels in the 60s on Thursday with a slight chance of showers along the coast in the onshore flow.

MARINE.

A cold front will move south of the area waters this morning. Strong high pressure north of the area and move slowly to the east. This pattern will create a pressure gradient and increase winds from the northeast and then east throughout the day with gusts just below gale force over the area waters. On Saturday, high pressure will be to our north and weaken as it moves over the eastern seaboard. This will allow winds to relax over the near shore waters and the small craft advisory will be dropped there early Saturday morning. However, the small craft advisory will persist for the offshore waters until Saturday evening. Another front will approach the area waters overnight Saturday and move over the area waters on Sunday with winds veering from the south and southwest before the front's passage. A good chance of rain is expected on Sunday. Strong high pressure will move in from the northwest on Monday into Tuesday and northerly winds over the area waters along with elevated seas are expected into early next week.

Rip Currents: High Risk of rip currents today for NE FL beaches with a Moderate risk of rip currents for SE GA beaches.

FIRE WEATHER.

Min RH values will fall into the 25-30% range across inland SE GA but sustained winds will generally remain below 15 mph so no headlines are expected this afternoon.

HYDROLOGY.

Minor flooding continue on the Altamaha River near Baxley into the weekend.

PRELIMINARY POINT TEMPS/POPS.

AMG 44 72 55 64 33 / 0 10 70 60 0 SSI 51 68 59 66 39 / 10 0 50 60 10 JAX 52 75 59 70 39 / 10 0 40 60 20 SGJ 57 73 59 71 43 / 10 0 20 60 30 GNV 52 76 58 70 40 / 0 0 30 60 30 OCF 54 77 57 72 43 / 0 0 20 50 40

JAX WATCHES/WARNINGS/ADVISORIES. FL . High Rip Current Risk through late tonight for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

Wind Advisory until 7 PM EST this evening for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

High Surf Advisory until 4 AM EST Saturday for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

GA . None. AM . Small Craft Advisory until 4 PM EST Saturday for 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.

Small Craft Advisory until 4 AM EST Saturday 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.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41112 - Offshore Fernandina Beach, FL (132) 30 mi43 min 63°F8 ft
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 33 mi53 min NE 23 G 29 56°F 60°F8 ft1033.1 hPa (+0.0)46°F

Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Brunswick, Malcolm McKinnon Airport, GA1 mi50 minNE 18 G 2710.00 miFair and Breezy60°F41°F50%1033.9 hPa
Brunswick / Glynco, GA10 mi48 minNE 17 G 2710.00 miFair57°F38°F51%1034.2 hPa

Link to 5 minute data for KSSI

Wind History from SSI (wind in knots)
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1 day agoW6W5SE4S3S3CalmCalmCalmCalmSW3W4SW4W6W6W6W7W5W4W3SW6W8W7W10W8
2 days agoSW4------------------------------------------SW7SW6

Tide / Current Tables for St. Simons Light, Georgia
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St. Simons Light
Click for Map
Fri -- 12:21 AM EST     Moonrise
Fri -- 01:33 AM EST     6.75 feet High Tide
Fri -- 07:24 AM EST     Sunrise
Fri -- 07:53 AM EST     -0.05 feet Low Tide
Fri -- 08:00 AM EST     Last Quarter
Fri -- 12:18 PM EST     Moonset
Fri -- 01:49 PM EST     6.63 feet High Tide
Fri -- 05:47 PM EST     Sunset
Fri -- 08:15 PM EST     -0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.86.66.764.73.11.50.3-00.623.75.26.36.664.83.31.70.4-0.3-01.12.7

Tide / Current Tables for St. Johns River Entrance, Florida Current (3)
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St. Johns River Entrance
Click for Map
Fri -- 12:22 AM EST     Moonrise
Fri -- 12:53 AM EST     2.62 knots Max Flood
Fri -- 04:02 AM EST     -0.00 knots Slack
Fri -- 06:34 AM EST     -1.96 knots Max Ebb
Fri -- 07:24 AM EST     Sunrise
Fri -- 08:00 AM EST     Last Quarter
Fri -- 10:40 AM EST     0.00 knots Slack
Fri -- 12:19 PM EST     Moonset
Fri -- 01:17 PM EST     2.23 knots Max Flood
Fri -- 04:13 PM EST     -0.00 knots Slack
Fri -- 05:48 PM EST     Sunset
Fri -- 06:54 PM EST     -2.16 knots Max Ebb
Fri -- 11:00 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.22.62.21.30.1-1.2-1.9-1.9-1.6-1.1-0.50.31.52.221.40.3-1-1.9-2.2-1.9-1.4-0.8-0

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
Wind Forecast for Jacksonville, FL (13,3,4,5)
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Ground Weather Radar Station Jacksonville, FL
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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.