Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
|Sunrise 7:04AM||Sunset 7:11PM||Saturday March 17, 2018 11:16 PM CDT (04:16 UTC)||Moonrise 7:22AM||Moonset 7:28PM||Illumination 2%|
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|GMZ538 Chandeleur Sound-breton Sound- 932 Pm Cdt Sat Mar 17 2018 |
Rest of tonight..South winds near 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Sunday..South winds 10 to 15 knots. Waves 2 feet. Dominant period 4 seconds. Slight chance of showers in the late morning and afternoon.
Sunday night..Southwest winds 10 to 15 knots. Waves 2 to 3 feet. Dominant period 4 seconds. Chance of showers through the night. Slight chance of Thunderstorms in the late evening and overnight.
Monday..Southwest winds 10 to 15 knots. Waves 2 to 3 feet. Dominant period 4 seconds. Chance of showers and slight chance of Thunderstorms in the morning.
Monday night..West winds 15 to 20 knots. Waves 3 to 4 feet. Dominant period 4 seconds.
Tuesday..Northwest winds 20 to 25 knots. Waves 3 to 5 feet with occasional waves to 6 feet. Dominant period 4 seconds.
Tuesday night..Northwest winds 20 to 25 knots. Waves 3 to 5 feet with occasional waves to 6 feet. Dominant period 4 seconds.
Wednesday..Northwest winds 10 to 15 knots. Waves 2 to 3 feet. Dominant period 4 seconds.
Wednesday night..North winds 15 to 20 knots. Waves 3 to 4 feet. Dominant period 4 seconds.
Thursday..Northeast winds 15 to 20 knots becoming southeast 5 to 10 knots late in the afternoon. Waves 2 to 4 feet.
Thursday night..East winds 10 to 15 knots. Waves 2 to 3 feet.
|GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 932 Pm Cdt Sat Mar 17 2018 |
Synopsis..Onshore flow pattern will persist through Monday. A cold front will move through the north central gulf Monday night. High pressure will settle over the northern gulf for the remainder of next week.
7 Day Forecast for Marine Location Near Port Sulphur, LAHourly EDIT Help
Area Discussion for - New Orleans/Baton Rouge, LA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus64 klix 180048|
area forecast discussion
national weather service new orleans la
748 pm cdt Sat mar 17 2018
Routine sounding terminated over the gulf of mexico east of ship
island at a height of 108,600 feet or 20.6 miles above the
Flight was launched a little over an hour after a thunderstorm
moved across the station. Airmass continues to moisten with a
precipitable water value of 1.51 inches. Airmass was certainly
primed for convection. Even after the storm passed, still had 1400
j kg available CAPE with a -4 lifted index. Lapse rates were
around 6.2c km. Freezing level at 11,300 feet, -20c at 23,400
feet and wet bulb zero around 10,200 feet.
Shear in the surface to 6km level was 40 knots. Southerly winds at
the surface quickly became southwest around 950 mb, and westerly
around 800 mb, remaining westerly through 70 mb. Peak wind of 101
knots was noted at 41,000 feet. 35
Prev discussion issued 350 pm cdt Sat mar 17 2018
short term... Ongoing diurnally forced convection will begin to
dissipate in the evening hours. As the convection dissipates and
winds turn calm in the low levels, another round of fog should
begin to form. Fairly widespread fog is expected by daybreak
tomorrow... Especially over inland areas. Temperatures will also
remain very mild overnight as lows only dip into the middle 60s.
Tomorrow, a couple of upper level features will affect the area.
A fast moving upper level vorticity MAX and the nose of a 120 knot
jet streak will move into the lower mississippi valley during the
morning hours. A sharp increase in omega values and resultant lift
across the area will cause scattered to numerous showers and
thunderstorms to begin developing around daybreak and persist
through the afternoon hours. Shear values will also turn more
favorable for some strong to possibly severe thunderstorms to
affect the northern third of the CWA tomorrow morning. The
increase in speed shear to over 50 knots in the lowest 6km can be
attributed to the jet streak moving in. Strong wind gusts and hail
should be the primary concern as directional shear values remain
During the evening hours tomorrow, a jet couplet should develop
over mississippi. Another round of convection should develop in
this very favorable region of forcing. However, it looks like the
strongest omega values will across central mississippi. Areas
north of the i-10 12 corridor will see the highest risk of
scattered showers and thunderstorms persist through the afternoon
and evening hours tomorrow. The severe threat should also persist
mainly due to continued elevated speed shear levels in excess of
50 knots through the evening hours. As a result, the threat of
hail and strong winds will persist into tomorrow evening with the
greatest threat over southwest mississippi.
A dry line should sweep through the area Monday morning as a
surface low deepens in the tennessee valley, and a shift in winds
to the west can be expected. This westerly flow will push some
drier air into the region, and expect to see any lingering
scattered convection in the early morning hours give way to
clearing skies by the afternoon. The combination of dry air
advection, some increased subsidence aloft, and increased solar
insolation should result in very warm temperatures on Monday.
Highs could easily rise into the middle 80s in the afternoon.
A secondary upper level trough and much stronger frontal boundary
will sweep through the area Monday night, and a region of
increased lift over the open gulf waters could produce some
offshore showers late Monday night or early Tuesday. Otherwise, a
wind shift and some passing clouds are all that is expected as
the trough axis sweeps through on Tuesday. Temperatures will cool
around 20 degrees behind the front with highs in the 60s on
a northwest flow pattern aloft and deep layer ridging in the low
to mid-levels will take hold on Wednesday and remain in place|
through Friday. Strong subsidence throughout the atmospheric
column and weak cold air advection will keep clear skies and
cooler than average temperatures in place for Wednesday and
Thursday. By Friday, some moderation in temperatures is expected
and highs should back to more typical levels seen in mid-march.
By Saturday, the ridge axis in the low to mid-levels will begin to
shift to the east, and some moisture and warm air advection will
develop across the area. However, an upper level ridge axis will
remain firmly in place. This upper level ridging should keep a
fairly strong cap in place aloft, but just enough forcing could
overcome the cap over southwest mississippi. As a result, have
decided to add in a slight chance of showers and thunderstorms for
southwest mississippi on Saturday. The cap will be significantly
stronger further to the south, and only expect to see a scattered
to broken cumulus field develop by Saturday afternoon. 32
discrete convective cells that were moving NE earlier today are now
moving almost due east around 12kt. Cells over the atchafalaya basin
have large cores supportive of hail aloft to about 1 inch diameters
that are likely melting to pea sized near the ground. Several radar
indications of microbursts in remote locations away from terminals
but gust potential in the 40-50kt range appear on track, based on
doppler samplings. Coverage should diminish with sunset then area
becoming increasingly favorable for widespread advective and
radiative fog formation overnight to lower conditions to lifr levels
most locations generally after 09z through about 1430z. More
destabilization with daytime heating after 17z forVFR cloud bases
that lower in scattered convection Sunday afternoon. 24 rr
steady state onshore flow underway to continue for much of Sunday
before becoming disrupted a bit with frontal zone settling across
the gulf states by Monday morning. Surge of high pressure pushes the
front into the north gulf late Monday night with high pressure
bringing strong northerly gradient winds and building seas to the
coastal waters heading into Tuesday and maintaining into Wednesday
before easing as advection neutralizes Wednesday afternoon. 24 rr
dss code: blue.
Activities: monitoring river flooding
decision support services (dss) code legend
green = no weather impacts that require action.
Blue = long-fused watch, warning, or advisory in effect or high
Yellow = heightened impacts with short-fused watch, warning or
advisory issuances; radar support.
Orange = high impacts; slight to moderate risk severe; nearby
tropical events; hazmat or other large episodes.
Red = full engagement for moderate risk of severe and or direct
tropical threats; events of national significance.
Preliminary point temps pops
Mcb 64 77 66 84 30 60 30 30
btr 64 80 66 84 30 50 20 30
asd 64 79 66 82 20 60 30 30
msy 65 80 67 82 20 50 20 30
gpt 64 74 66 78 20 40 40 30
pql 63 76 65 80 20 30 50 40
Lix watches warnings advisories
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|SHBL1 - 8761305 - Shell Beach, LA||19 mi||47 min||S 8 G 9.9||69°F||68°F||1014 hPa|
|GISL1 - 8761724 - Grand Isle, LA||29 mi||47 min||SSE 2.9 G 5.1||70°F||69°F||1014.3 hPa|
|KDLP||33 mi||22 min||SE 5.1 G 9.9||72°F||72°F|
|PILL1||35 mi||47 min||S 6 G 7||64°F||55°F||1014.3 hPa|
|CARL1||36 mi||47 min||55°F|
|NWCL1 - 8761927 - New Canal, LA||39 mi||47 min||S 5.1 G 8||71°F||65°F||1013.6 hPa|
|BYGL1 - 8762482 - Bayou Gauche, LA||44 mi||47 min||SSE 1.9 G 4.1||68°F||70°F||1014 hPa|
|KXPY||45 mi||22 min||SE 5.1||72°F||70°F|
|KMIS||46 mi||22 min||S 11||73°F||70°F|
|PSTL1 - 8760922 - Pilot's East, SW Pass, LA||48 mi||47 min||SSE 1.9 G 2.9||69°F||56°F||1015 hPa|
|BURL1 - Southwest Pass, LA||49 mi||77 min||SSE 5.1 G 5.1||70°F||1014.8 hPa (+0.4)||70°F|
Wind History for Shell Beach, LA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Boothville, LA||22 mi||26 min||S 4||2.00 mi||Fog/Mist||71°F||70°F||96%||1014.5 hPa|
Wind History from BVE (wind in knots)
|1 day ago||SE||E||Calm||SE||E||E||SE||SE||SE||S||S||S||S||S||S||S||S||S||S||S||S||S||SE||S|
|2 days ago||SW||SW||SW||W||W||NW||NW||NW||Calm||Calm||Calm||SW||S||S||S||S||S||S||SE||SE||SE||E||SE||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Bay Gardene |
Click for Map
Sun -- 02:57 AM CDT 0.75 feet High Tide
Sun -- 07:04 AM CDT Sunrise
Sun -- 07:57 AM CDT Moonrise
Sun -- 10:02 AM CDT 0.36 feet Low Tide
Sun -- 03:19 PM CDT 0.53 feet High Tide
Sun -- 07:08 PM CDT Sunset
Sun -- 08:25 PM CDT Moonset
Sun -- 09:22 PM CDT 0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Gardner Island |
Click for Map
Sun -- 01:06 AM CDT 0.78 feet High Tide
Sun -- 07:03 AM CDT Sunrise
Sun -- 07:56 AM CDT Moonrise
Sun -- 09:12 AM CDT 0.41 feet Low Tide
Sun -- 01:16 PM CDT 0.51 feet High Tide
Sun -- 07:07 PM CDT Sunset
Sun -- 08:01 PM CDT 0.32 feet Low Tide
Sun -- 08:24 PM CDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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.
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Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for New Orleans/Baton Rouge, LA (0,6,7,8)(on/off)  Help
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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 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.