Thursday, April27, 2017 L-36.com


Marine Weather and Tides
St. Augustine South, FL

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:43AMSunset 8:00PM Thursday April 27, 2017 2:38 PM EDT (18:38 UTC) Moonrise 6:53AMMoonset 8:31PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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AMZ454 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- 1101 Am Edt Thu Apr 27 2017
.small craft should exercise caution...
Rest of today..South southeast winds increasing to 15 to 20 knots. Seas 2 to 4 feet. Dominant period 8 seconds. Inland waters becoming choppy.
Tonight..South southwest winds 15 knots...decreasing to around 5 knots after midnight. Seas 2 to 4 feet. Dominant period 5 seconds. Inland waters a moderate chop...becoming mostly smooth late.
Friday through Saturday..South southeast winds 15 knots. Seas 2 to 4 feet. Dominant period 5 seconds. Inland waters a moderate chop.
Saturday night and Sunday..South southeast winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Inland waters choppy.
Sunday night..South winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Inland waters choppy.
Monday..South winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Inland waters choppy. A chance of showers and Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 1101 Am Edt Thu Apr 27 2017
Synopsis.. High pressure centered over the atlantic waters adjacent to the florida peninsula will lift northward this weekend. A cold front will approach our local waters by late Monday...resulting in strengthening southerly winds beginning Saturday night.

7 Day Forecast for Marine Location Near St. Augustine South CDP, FL
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location: 29.87, -81.31     debug


Area Discussion for - Jacksonville, FL
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Fxus62 kjax 271548
afdjax
area forecast discussion
national weather service jacksonville fl
1148 am edt Thu apr 27 2017

Hot, breezy and dry conditions this afternoon...

Update
Late morning surface analysis depicts a cold front extending from
the great lakes states southward through the tennessee valley and
approaching the western florida panhandle. Aloft... Shortwave
troughing is deflecting northeastward through the upper midwest
and towards the western great lakes by ridging that is
strengthening over the gulf of mexico and south florida. Our local
pressure gradient continues to tighten with the approach of the
cold front well to our west, with breezy southerly winds of 15-25
mph in place nearly area-wide as of 15z. A few patches of
stratocumulus are migrating across southeast georgia, with the
deeper cumulus field building over the florida big bend. Sunny
skies and rising heights aloft are resulting in skyrocketing
temperatures, as most locations are already in the low to mid 80s,
with dewpoints falling into the upper 50s and lower 60s. There are
no signs of the smoke plume from the ongoing west mims wildfire as
of 1530z from visible satellite imagery nor kjax/kvax doppler
radars.

The atlantic coast sea breeze will struggle to move very far
inland this afternoon and should remain east of the interstate 95
corridor later this afternoon. This will allow highs to climb to
the upper 80s at the beaches, with lower 90s expected inland. All
model guidance keeps convection associated with the weakening cold
just northwest of the altamaha/ocmulgee rivers this afternoon.

Strengthening winds will likely invigorate the west mims
wildfire smoke plume this afternoon, with smoke likely impacting
folkston and nahunta, possibly reducing visibilities to 3-5 miles
at times. We expect a stratus deck to move onshore from the
northeastern gulf of mexico overnight, impacting the suwannee
valley and interior southeast georgia during the predawn hours on
Friday. Deep south-southwest flow will result in warmer low
temperatures tonight, with mid to upper 60s forecast area-wide.

Aviation
Vfr conditions will prevail at the regional terminals through at
least 06z. Southerly surface winds will continue to strengthen
this afternoon, with sustained speeds near 15 knots with frequent
gusts to 25 knots. Winds may back to a more southeasterly
direction after 18z at sgj and ssi as the atlantic sea breeze
attempts to move inland. Smoke from the ongoing west mims wildfire
may begin to impact ssi after 06z, with a low confidence in MVFR
visibilities at ssi during the predawn hours on Friday. A low
stratus deck is expected to move inland from the northeast gulf of
mexico overnight, with MVFR to ifr ceilings possible at gnv
towards 09z.

Marine
A cold front is slowing its forward progress as it moves into the
southeastern states, which is causing our local pressure gradient
to tighten. South-southeasterly winds will strengthen as the
afternoon progresses, and small craft should exercise caution in
both the near shore and offshore waters today as speeds increase
to 15-20 knots. Seas offshore will build to 4-5 feet by late
afternoon. The front will stall well to the northwest of the
waters this evening and will then lift northward as a warm front
on Friday, resulting in a loosening local pressure gradient as
the axis of atlantic ridging begins to lift northward from the
florida peninsula. Winds will become south southwesterly this
evening, with speeds falling below caution level speeds in the
near shore waters. Winds will remain south-southeasterly through
Saturday, with caution level speeds continuing tonight offshore
and then remaining just below caution level speeds from Friday
through Saturday. The next cold front on the horizon will move
through the lower mississippi valley on Sunday, causing our local
pressure gradient to gradually tighten late this weekend.

Southerly winds will strengthen to caution levels on Saturday
night and will continue through Sunday night for both the near
shore and offshore waters. Winds and seas are expected to reach
small craft advisory levels in the offshore waters on Monday as
the cold front approaches our waters from the west.

Rip currents: low risk expected today, with a moderate risk
possible from Friday through the weekend due to persistent south-
southeast winds combined with a southerly longshore current.

Fire weather
Winds today will veer to the southwest and increase to 15 to 20
mph with gusts up to 25 to 30 mph. Relative humidities will bottom
out this afternoon mainly in the 30-40% range. Dispersions will be
high today, especially across inland southeast georgia.

Hot and dry conditions will continue into Friday. Winds will be
lighter as high pressure ridge settles over the region, with
prevailing winds generally out of the southwest around 10 mph. The
seabreeze will push well inland late Friday afternoon with winds
becoming southeasterly and gusty behind the seabreeze, especially
near the coast. Relative humidities will climb a little but some
areas could still drop down into the 35-40% range. Although
chances are low, isolated thunderstorms will be possible as the
two seabreezes collide near the highway 301 corridor late in the
day on Friday.

Climate
Record highs for today 4/27...

jax 94/1986... Gnv 96/2011... Amg 96/1986... Ssi 94/1986
record highs for tomorrow 4/28...

jax 94/1991... Gnv 95/1991... Amg 92/1970... Ssi 92/1985

Preliminary point temps/pops
Amg 89 66 92 68 / 10 10 10 10
ssi 84 71 86 72 / 0 0 10 10
jax 91 67 92 71 / 0 0 10 10
sgj 89 69 87 72 / 0 0 10 10
gnv 91 66 94 68 / 0 10 20 10
ocf 91 66 95 69 / 0 0 20 10

Jax watches/warnings/advisories
Fl... None.

Ga... None.

Am... None.

Nelson/shashy/walker


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAUF1 - St. Augustine, FL 3 mi39 min SE 14 G 15 77°F 76°F1014 hPa (-1.4)
RCYF1 14 mi51 min 79°F
41117 15 mi107 min 74°F3 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 15 mi114 min SE 8.9 84°F 1015 hPa67°F
BKBF1 30 mi51 min SSE 9.9 G 12 85°F 78°F
LTJF1 36 mi51 min 84°F 62°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 37 mi51 min SSE 11 G 17 83°F 75°F1013.2 hPa
JXUF1 37 mi51 min 76°F
BLIF1 38 mi51 min S 9.9 G 15 87°F 1013.1 hPa60°F
DMSF1 38 mi51 min 76°F
NFDF1 40 mi51 min S 8.9 G 13 85°F 1013.2 hPa

Wind History for I-295 Bridge, St Johns River, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St. Augustine, St. Augustine Airport, FL7 mi43 minSE 165.00 miSmoke86°F64°F49%1013.1 hPa

Wind History from SGJ (wind in knots)
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Last 24hrSE15SE16SE16SE15SE13SE8S12S11S9S5--S5SW5S6SW3S6S6S8S7S7S7
G15
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1 day agoW10W9NW6W7W7SW4SW6SW7W9SW7W6W6SW6SW6SW6SW5SW6SW6SW6SW5SW76
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2 days agoW10
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Tide / Current Tables for State Road 312, Matanzas River, Florida
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State Road 312
Click for Map
Thu -- 04:10 AM EDT     -0.53 feet Low Tide
Thu -- 06:45 AM EDT     Sunrise
Thu -- 07:53 AM EDT     Moonrise
Thu -- 10:19 AM EDT     4.73 feet High Tide
Thu -- 04:17 PM EDT     -0.70 feet Low Tide
Thu -- 08:00 PM EDT     Sunset
Thu -- 09:30 PM EDT     Moonset
Thu -- 10:47 PM EDT     5.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
42.61.20-0.5-0.20.823.24.24.74.63.72.41.1-0-0.7-0.50.623.44.65.45.6

Tide / Current Tables for Crescent Beach, Matanzas River, Florida
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Crescent Beach
Click for Map
Thu -- 05:10 AM EDT     -0.72 feet Low Tide
Thu -- 06:45 AM EDT     Sunrise
Thu -- 07:53 AM EDT     Moonrise
Thu -- 10:57 AM EDT     4.20 feet High Tide
Thu -- 05:20 PM EDT     -0.81 feet Low Tide
Thu -- 07:59 PM EDT     Sunset
Thu -- 09:30 PM EDT     Moonset
Thu -- 11:24 PM EDT     5.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.231.90.9-0.1-0.7-0.40.823.13.94.23.82.81.70.7-0.1-0.8-0.60.62.13.44.45

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Jacksonville, FL (14,3,4,5)
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Ground Weather Radar Station Jacksonville, FL
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weather_mapweather_map weather_map

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Disclaimer:
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 numerious 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.