Saturday, April29, 2017

Marine Weather and Tides
Long Beach, MS

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 6:12AMSunset 7:34PM Saturday April 29, 2017 6:13 AM CDT (11:13 UTC) Moonrise 9:11AMMoonset 11:16PM Illumination 12% Phase: Waxing Crescent; Moon at 3 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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GMZ532 Mississippi Sound- 336 Am Cdt Sat Apr 29 2017
.small craft advisory in effect through Sunday evening...
Today..Southeast winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms in the afternoon.
Tonight..Southeast winds 20 to 25 knots. Waves 3 to 6 feet. Dominant period 4 seconds.
Sunday..South winds 20 to 25 knots. Waves 3 to 6 feet. Dominant period 4 seconds. Chance of showers and Thunderstorms in the morning, then showers and Thunderstorms in the afternoon.
Sunday night..South winds 20 to 25 knots becoming west 15 to 20 knots with gusts to near 35 knots in the late evening and early morning, then becoming northwest 10 to 15 knots after midnight. Waves 3 to 5 feet with occasional waves to 6 feet. Dominant period 4 seconds. Waves or seas subsiding to 2 to 4 feet. Dominant period 4 seconds after midnight. Showers and Thunderstorms in the evening, then chance of showers and Thunderstorms after midnight.
Monday..Northwest winds 10 to 15 knots becoming west 5 to 10 knots in the afternoon. Waves 1 to 2 feet. Dominant period 4 seconds.
Monday night..Northwest winds 5 to 10 knots becoming northeast after midnight. Waves 1 foot or less. Dominant period 4 seconds.
Tuesday..Southeast winds 5 to 10 knots. Waves 1 to 2 feet. Dominant period 4 seconds.
Tuesday night..Southeast winds 10 to 15 knots. Waves 1 to 2 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
Wednesday..South winds 10 to 15 knots. Waves 2 to 4 feet. Chance of showers and Thunderstorms.
Wednesday night..Southwest winds 15 to 20 knots. Waves 3 to 5 feet. Showers and Thunderstorms likely.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 336 Am Cdt Sat Apr 29 2017
Synopsis..A strengthening low pressure system will affect the coastal waters through the weekend. The low will push away from the area by Monday allowing high pressure to settle in for Tuesday.

7 Day Forecast for Marine Location Near Long Beach, MS
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location: 30.32, -89.14     debug

Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 290923
area forecast discussion
national weather service new orleans la
423 am cdt Sat apr 29 2017

Short term
What a difference 12 hours makes. Deep moisture has once again
and rapidly moved through the area as it transits northward to
help maintain strong and severe thunderstorms throughout the
center of the country. This is also causing the pressure gradient
to tighten significantly which will be noticed today and Sunday.

Wind speeds today should be within the 20-25mph range gusting to
35mph. Sunday should see 25mph with gusts to 35mph and possibly as
high as 40mph at times. Wind advisories have been posted for
today and they will likely be posted again for Sunday by this

Severe weather variables are very high today into Sunday but they
are mostly stuck beneath a strong 4c subsident inversion. This
inversion will remain relatively in tact while weakening slowly
through Sunday morning as the cold front approaches. This
inversion should keep the majority of thunderstorm activity from
forming until the front approaches causing the inversion to lift
and weaken enough to allow sh/ts to erupt as the front moves
through. Advection of these severe wx variables will also move
beneath this inversion toward the volatile boundary well to the
north of the area until Sunday. Moisture loading within the
boundary layer will help cause cloud cover at the base of the
inversion as frictional convergence helps the moisture gently rise
as it moves out of the gulf. This could cause light showers to
develop again today.

A 50kt jet at about 870mb will also set up tonight. This will help
lift the boundary layer moisture as well and cause the low level
clouds to move very fast to the northwest tonight and Sunday.

This is what will provide one ingredient for any severe weather
Sunday. Any thunderstorm activity that can produce 20-30mph winds
by momentum transfer to the sfc coupled with the already gradient
wind speeds of 25mph could easily produce 50+mph wind speeds
along the boundary Sunday. This could cause damaging wind gusts,
and this should be the main hazard with any strong or severe
thunderstorms Sunday. The other severe weather parameters will
not be discounted but should not be as prevalent. Since wind
speeds are strong at the sfc and vertical wind direction becomes
more uniform as the boundary approaches, both the vertical and
speed shear variables are expected to be moderate at best once the
inversion gives way. This could cause some weak spin ups that
would be rain wrapped as the line of sh/ts moves through. Wet bulb
zero heights will be around 12k+ft as very warm air produces
temps around -3c at 500mb; so hail, if any, looks to be small.

Rainfall amounts are still expected to be from 2 to 4 inches total
through Sunday night. Most of this is expected with the boundary
as it moves through which would cause this to fall with a
relatively short period. Minor flooding of low lying and poor
drainage areas would also be possible Sunday.

Coastal flooding would be the next biggest item on the list. Areas
that normally receive salt water inundation during times of
abnormal high tide levels will receive water during this scenario
starting today. Tide levels are expected to be 1-2ft above normal
levels through Sunday. Highest levels will be during times of high
tides which will be from late morning through the early afternoon
hours each day. Some of the lowest beach and secondary routes may
observe as much as 3" of salt water over those surfaces today and
as much as 7" Sunday.

Long term
Another round of sh/ts are expected Wednesday into Thursday
morning ahead of another cold front that should move through the
area Thursday morning.

Expect MVFR to ifr conditions to prevail this morning as abundant
moisture is in place yielding low CIGS across the forecast area. Low
clouds should break up some and lift for some areas to get into the
vfr range but expect mostly MVFR conditions to prevail throughout
the forecast period. Winds will be elevated today as winds at most
terminals will be around 20 knots out of the south across the entire
area. A few gusts up to 30 knots cannot be ruled out... As well
as an isolated shower or thunderstorm this afternoon. 13/mh

Not much change in the forecast this morning. The pressure gradient
will remain tight across the coastal waters through the weekend. A
deepening low pressure system over the plains will yield southerly
winds of 20 to 30 knots through Sunday. Small craft advisories are
posted for the entire coastal waters through Sunday evening as the
waters will be hazardous all weekend. There is also an outside
chance that the small craft advisory may have to be upgraded to a
gale warning, especially east of the mississippi river this
afternoon through early Sunday morning. This will have to be watched
as this system evolves. Gulf waters due to these winds and seas of
up to 7 feet. The tightening pressure gradient will result in strong
onshore winds of 25 to 30 knots impacting the coastal waters this
afternoon through Sunday evening. Very rough seas of up to 12 feet
could also impact the open gulf waters during this period. Over the
sounds and lakes waves of up to 6 feet will be possible.

Winds will shift to the northwest late Sunday night and Monday in
the wake of the low pressure system and cold front. Winds should
remain elevated at around 20 knots through morning hours on Monday
and seas will remain rough. Conditions will begin to improve Monday
night and Tuesday as high pressure settles directly over the waters.

Winds will veer back to the east by Tuesday and decrease to between
10 and 15 knots. Seas should also fall back to 2 to 4 feet by
Tuesday morning. 13/mh

Decision support
Dss code... Blue.

Deployed... None.

Activation... None.

Activities... Monitoring severe potential for Sunday.

Decision support service (dss) code legend:
green = no weather impacts that require action
blue = long fused watch/warning/advisory in effect or high
visibility event
yellow = heightened impacts with short fused
watch/warning/advisory issuances; radar support
orange = high impacts - slight to moderate risk of severe weather;
nearby tropical events, hazmat or other large episodes
red = full engagement for moderate risk of severe weather; direct
tropical threats; events of national significance.

Preliminary point temps/pops
Mcb 88 73 78 52 / 30 20 100 50
btr 89 75 78 53 / 30 40 100 40
asd 86 75 80 60 / 20 10 100 70
msy 87 75 82 61 / 20 20 100 60
gpt 84 76 79 62 / 20 10 100 80
pql 84 74 81 63 / 20 10 100 90

Lix watches/warnings/advisories
La... Wind advisory from 6 am this morning to 10 pm cdt this evening
for laz034>037-039-040-046>050-056>072.

Coastal flood advisory until midnight cdt Sunday night for

Gm... Small craft advisory until midnight cdt Sunday night for gmz530-

Ms... Wind advisory from 6 am this morning to 10 pm cdt this evening
for msz068>071-077-080>082.

Coastal flood advisory until midnight cdt Sunday night for

Gm... Small craft advisory until midnight cdt Sunday night for gmz532-

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 10 mi55 min SE 12 G 13 77°F 77°F1013.5 hPa
DKCM6 - 8741501 - Dock C, Pascagoula, MS 30 mi55 min SE 14 G 19 76°F 1014.2 hPa
PNLM6 - 8741533 - Pascagoula NOAA Lab, MS 31 mi55 min 77°F
42067 - USM3M02 32 mi153 min SE 16 G 18 76°F 4 ft1014.2 hPa75°F
RARM6 - 8741094 - Range A rear, Pascagoula, MS 33 mi55 min ESE 12 G 17 76°F 1014.1 hPa
ULAM6 - 8741041 - Dock E. Port of Pascagoula, MS 34 mi55 min 78°F
PTBM6 - 8741003 - Petit Bois Island, MS 34 mi55 min ESE 13 G 17 75°F 1015 hPa
GDXM6 - Grand Bay Reserve, MS 38 mi88 min SE 18 76°F 1015 hPa74°F
SHBL1 - 8761305 - Shell Beach, LA 42 mi55 min SSE 12 G 18 76°F 78°F1013 hPa
KATA1 - Katrina Cut, AL 49 mi73 min SE 16 75°F 1014.6 hPa (-0.7)

Wind History for West Pier, Port of Gulfport, MS
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gulfport - Gulfport-Biloxi International Airport, MS7 mi20 minSE 126.00 miFog/Mist77°F75°F94%1013.7 hPa
Keesler Air Force Base / Biloxi, MS14 mi75 minSE 810.00 miOvercast77°F73°F90%1014.1 hPa

Wind History from GPT (wind in knots)
Last 24hrS13SE15S13SE16
1 day agoNW8NW10N9N8NW5Calm3SE7S8S9S7S6S4S3S4S7S7S11S13
2 days agoS11

Tide / Current Tables for Gulfport, Gulfport Harbor, Mississippi
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Click for Map
Sat -- 06:14 AM CDT     Sunrise
Sat -- 09:10 AM CDT     Moonrise
Sat -- 01:25 PM CDT     2.00 feet High Tide
Sat -- 07:33 PM CDT     Sunset
Sat -- 11:13 PM CDT     -0.09 feet Low Tide
Sat -- 11:15 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Cat Island (West Point), Mississippi
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Cat Island (West Point)
Click for Map
Sat -- 06:15 AM CDT     Sunrise
Sat -- 09:11 AM CDT     Moonrise
Sat -- 12:37 PM CDT     2.03 feet High Tide
Sat -- 07:33 PM CDT     Sunset
Sat -- 11:15 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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

GOES Local Image of Southeast    EDIT

Wind Forecast for New Orleans/Baton Rouge, LA (7,2,3,4)
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Ground Weather Radar Station Mobile, AL
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weather_mapweather_map weather_map

Gulf Stream Current

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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 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 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.