Tuesday, October22, 2019 L-36.com


Marine Weather and Tides
Montgomery, GA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:31AMSunset 6:45PM Tuesday October 22, 2019 9:36 AM EDT (13:36 UTC) Moonrise 12:11AMMoonset 2:25PM Illumination 35% Phase: Waning Crescent; Moon at 24 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 733 Am Edt Tue Oct 22 2019
Today..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers with a slight chance of tstms this afternoon.
Tonight..W winds 10 to 15 kt, becoming nw 15 to 20 kt after midnight. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. A chance of showers with a slight chance of tstms in the evening.
Wed..N winds 15 to 20 kt, becoming ne 10 to 15 kt in the afternoon. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon.
Wed night..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..NE winds 10 to 15 kt. Seas 3 ft.
Thu night..E winds 15 kt. Seas 3 ft. A slight chance of showers.
Fri..E winds 10 to 15 kt. Seas 3 ft. A chance of showers with a slight chance of tstms.
Fri night..E winds 10 kt. Seas 3 ft. A chance of showers with a slight chance of tstms.
Sat..E winds 10 to 15 kt. Seas 3 ft. A chance of showers.
Sat night..E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 733 Am Edt Tue Oct 22 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will move through today. High pressure will expand across the area Tuesday night through Thursday. A series of low pressure systems will move through the area Friday through early next week.


7 Day Forecast for Marine Location Near Montgomery, GA
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location: 31.84, -81.15     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 221136
afdchs
area forecast discussion
national weather service charleston sc
736 am edt Tue oct 22 2019

Synopsis
A cold front will move through today. High pressure will expand
across the area Tuesday night through Thursday. A series of low
pressure systems will move through the area Friday through
early next week.

Near term through tonight
Today: aloft, the forecast area will remain situated within
southwest flow between a deep upper low over the great lakes
region and an upper ridge situated to the southeast. Overall,
upper level forcing looks like it will be waning as it arrives
into the region today. The main shortwave trough and associated
vorticity energy will be displaced to the northwest and will
lift well away from the forecast area today. Instead, forcing
for precipitation today looks like it will be primarily
dependent on diurnal heating and convergence along a cold front
that will advance through the area. For the past several days,
model guidance has become steadily less impressive with the
precipitation response with this front. This make sense given
that the best large scale forcing for ascent will pass by to the
north. Instead, this looks like a situation that will support
scattered showers and isolated thunderstorms peaking in coverage
roughly from the late morning through the mid afternoon hours.

Instability looks limited today, with CAPE values 500 j kg or
less. However, it is interesting to note that 0-6 km shear is
progged to peak in the 40-50 knot range during peak heating as
500 mb flow increases across the region. So while the lack of
instability will keep the severe threat low, it isn't out of the
question for there to be a strong storm or two. Don't think it
is worthy of a mention in the hwo, but we are in a marginal risk
area from spc. Expect a warm afternoon with highs peaking in
the low to mid 80s across the area.

Tonight: the cold front will advance through the area quickly
this afternoon and should be right along the coast by the early
evening hours. The front will push well offshore through the
overnight as cooler and drier air filters in. Skies will clear
out, other than a few lingering high clouds. Forecast lows range
from the upper 40s well inland to the mid upper 50s along the
immediate coast.

Short term Wednesday through Friday
Dry high pressure will prevail Wednesday into Thursday with
near-normal temperatures. A longwave upper trough will slowly
approach from the west Thursday night and Friday, spurring a
warm front to develop and lift north through the area. Moisture
will steadily increase late Thursday night into Friday with the
greatest pwats over the area Friday afternoon. Although the
strongest synoptic forcing is forecast to remain west of the
area, decent upper level divergence coincident with deep
moisture and isentropic lift will support scattered showers on
Friday. Instability fields indicate the potential for isolated
thunder in the warm sector.

Long term Friday night through Monday
A relatively wet period is in store for the weekend into early
next week. A long-duration broad upper trough will persist to
our west while unseasonably high moisture continues to
overspread the southeast. A series of surface lows will lift
northeast through the area, bringing periods of showers.

Aviation 12z Tuesday through Saturday
Ifr ceilings are in place at both kchs and ksav at 12z. Ifr
conditions should continue through the next 2-3 hours before
lifting to MVFR. A cold front will cross the region this
afternoon, and could bring showers or possibly a thunderstorm
near the terminals. Confidence in direct impacts is low so we
are only carrying vcsh at kchs and no mention at ksav. Winds
could be breezy this afternoon, with gusts up to around 20
knots.VFR conditions will return behind the front and winds
will turn west and then northwest.

Extended aviation outlook: increasing chances for low clouds
late Thursday night through the weekend along with scattered
showers.

Marine
Today through tonight: southwest flow will increase modestly
through the afternoon hours ahead of an approaching cold front.

Wind speeds should top out in the 15-20 knot range in the
charleston county waters, remaining just below small craft
advisory criteria. Overnight, the cold front will pass through
in the evening and winds will turn west and northwest with time.

Winds will increase as mixing depth increases in the cold
advection, becoming a solid 15-20 knots just about everywhere.

The strongest winds are expected in the charleston county waters
and the outer georgia waters, and gusts to 25 knots will be
possible. Conditions could become marginally supportive of small
craft advisories, but confidence is too low at this time. Will
re-evaluate later today. Seas will average 2-4 feet today,
increasing to up to 5 feet tonight behind the front.

A northeast flow will persist over the waters for much of the
time from Wednesday through the weekend. Although winds are not
currently forecast to reach small craft advisory levels, seas
may push above 6 ft this weekend in response to a slight uptick
in wind speeds.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Bsh
short term... Jrl
long term... Jrl
aviation... Bsh jrl
marine... Bsh jrl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi54 min SW 6 G 11 75°F 74°F1013.7 hPa
SAXG1 - Sapelo Island Reserve, GA 30 mi96 min SSW 9.9 75°F 1013 hPa (-0.0)74°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi46 min SW 18 G 21 77°F 77°F3 ft1013 hPa (-0.0)76°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA13 mi1.7 hrsSSW 510.00 miOvercast75°F72°F93%1012.4 hPa
Savannah-Hilton Head International Airport, GA21 mi43 minSW 910.00 miOvercast76°F73°F94%1013.3 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi1.7 hrsSSW 510.00 miOvercast75°F73°F94%1012.4 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrE6E8E10E8E11E6E8E8E6E4SE3SE6E4E5E4SE3CalmW3CalmCalmS5S8SW5SW8
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W11W9W7CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3
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Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Tue -- 01:11 AM EDT     Moonrise
Tue -- 03:32 AM EDT     7.03 feet High Tide
Tue -- 07:33 AM EDT     Sunrise
Tue -- 10:03 AM EDT     0.88 feet Low Tide
Tue -- 03:25 PM EDT     Moonset
Tue -- 03:59 PM EDT     8.22 feet High Tide
Tue -- 06:44 PM EDT     Sunset
Tue -- 10:49 PM EDT     0.97 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.34.96.16.976.35.13.82.41.30.91.42.84.66.57.88.27.86.75.23.72.31.31

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Tue -- 12:49 AM EDT     1.44 knots Max Flood
Tue -- 01:09 AM EDT     Moonrise
Tue -- 04:32 AM EDT     -0.00 knots Slack
Tue -- 07:20 AM EDT     -1.50 knots Max Ebb
Tue -- 07:32 AM EDT     Sunrise
Tue -- 10:33 AM EDT     0.00 knots Slack
Tue -- 01:17 PM EDT     1.99 knots Max Flood
Tue -- 03:24 PM EDT     Moonset
Tue -- 05:02 PM EDT     -0.00 knots Slack
Tue -- 06:43 PM EDT     Sunset
Tue -- 08:10 PM EDT     -1.81 knots Max Ebb
Tue -- 11:23 PM EDT     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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1.31.41.20.90.4-0.4-1.2-1.5-1.5-1.2-0.60.51.521.91.40.90-1-1.6-1.8-1.7-1.3-0.4

Weather Map
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wmap_A
GEOS Local Image of Southeast    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 Charleston, SC (9,2,3,4)
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Ground Weather Radar Station Charleston, SC
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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.