Saturday, April29, 2017

Marine Weather and Tides
Pass Christian, 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 12:33 AM CDT (05:33 UTC) Moonrise 9:11AMMoonset 11:15PM Illumination 11% 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- 1034 Pm Cdt Fri Apr 28 2017
.small craft advisory in effect through Sunday morning...
Rest of tonight..Southeast winds 15 to 20 knots with frequent higher gusts. Waves 2 to 4 feet. Dominant period 4 seconds.
Saturday..Southeast winds 20 to 25 knots. Waves 3 to 5 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms in the afternoon.
Saturday night..Southeast winds 20 to 25 knots. Waves 3 to 5 feet with occasional waves to 6 feet. Dominant period 4 seconds. Slight chance of showers and Thunderstorms.
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 likely in the afternoon.
Sunday night..South winds 20 to 25 knots becoming west 15 to 20 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 showers and Thunderstorms likely after midnight.
Monday..West winds 10 to 15 knots. Waves 2 to 4 feet. Dominant period 4 seconds.
Monday night..Southwest winds 5 to 10 knots becoming southeast after midnight. Waves 1 to 2 feet. 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 2 to 4 feet. Slight chance of showers and Thunderstorms.
Wednesday..South winds 15 to 20 knots. Waves 1 to 2 feet. Chance of showers and Thunderstorms.
Wednesday night..South winds 15 to 20 knots. Waves 2 to 4 feet. Showers and Thunderstorms likely.
GMZ500 Synopsis Pascagoula To Sw Pass Mississippi- Synopsis Sw Pass Mississippi River To Atchafalaya River- 1034 Pm Cdt Fri Apr 28 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 Pass Christian city, MS
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location: 30.22, -89.11     debug

Area Discussion for - New Orleans/Baton Rouge, LA
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Fxus64 klix 290126
area forecast discussion
national weather service new orleans la
826 pm cdt Fri apr 28 2017

Sounding discussion
There were no problems with the upper air release this evening.

The 00z sounding indicated an unstable sounding with moisture
largely confined beneath a strong inversion in the 870 to 765 mb
layer. Dry air prevailed in the mid levels. The precipitable
water value was 1.52 inches. Southeast winds were observed near
the surface with southerly flow then up to 400 mb. Southwest winds
prevailed above that level. 11

Prev discussion /issued 450 pm cdt Fri apr 28 2017/

latest surface analysis showed a 1022mb high off the carolinas
coast with the ridge axis west to northwest gulf of mexico. In
addition, 997mb low/trough was noted over the southern plains.

Both features creating a tight pressure gradient of 10mb from
houston to mobile. South winds of 15 to 25 mph with frequent gusts
up to 30 mph were common this afternoon. Surface dewpoint readings
were mainly in the 70s across louisiana and most of mississippi.

Upper air analysis showed a high over florida and deep cyclonic
low over the four corners region. Isotach analysis at 250mb showed
a 160 knot jet MAX on the back side of low and 120 knot jet MAX on
the front side from texas panhandle to great lakes region. Sub-
tropical jet of 70 knots was present from south texas to north
central gulf of mexico.

Short term...

this morning felt like july for areas. Winds did not decouple
over night and temperatures remain elevated especially around the
coast. Strong inversion from 4500 to 7000 feet will remain in play
through Saturday. However, surface heating in the mid to upper
80s may overcome this lid, the same as today but the system out
west will be closer Saturday afternoon. Maintained a chance of
convection across northwest zones. However, activity that do
develop will be isolated on Saturday.

Upper level low will press east over the southern plains tonight
through Saturday night. This system will create large wind field
across the lower mississippi valley. Boundary layer winds around
25 knots are expected across florida parishes and southwest
mississippi and 20 knots over mississippi coast by midday Saturday
but 25 to 30 knots south of tidal lakes. Higher values will be
present over northwest gulf and these values will shift over
coastal waters east of mississippi river Saturday night.

There remains a high potential for widespread strong thunderstorms
with several of these becoming severe. Strong damaging wind
speeds look to be the most efficient component. This is due to the
addition of momentum transfer from thunderstorm activity to the
surface where there will already be winds around 25 mph. Any
thunderstorm will not have to produce more than a 25mph wind to
cause some fairly strong cumulative wind speeds.

Other modes of severe weather will not be left out. Precipitable
water values are expected to pool along the trough axis with
values up to 2.1 inches moving across the forecast area Sunday
morning through early Sunday evening. Total amounts during the
weekend event look to be between 2 to 4 inches with isolated
higher amounts. GOES without saying that if the majority of this
amount falls within a short period flooding would be possible.

Tides are up this afternoon. While only a few areas were affected
this afternoon. Stronger winds Saturday and Sunday will increase
tide levels especially during the high tide cycle each day. Levels
are expected to be half to 1 and half above normal Saturday and 1
to 2 feet above normal Sunday. Will maintain coastal flood
advisory through Sunday evening and a few areas may be upgraded to
a warning if necessary.

Long term...

dry air will move in behind this front once it moves through the
area Sunday night into Monday. Tuesday night should find warm
front lifted northeast ahead of the next cold front. This feature
could be strongly forced depending on how deep the polar jet digs
over the gulf south, which would lead to a good bit of
thunderstorm activity once again from Wednesday through late
Thursday. The final push with cold air advection will occur next
Friday afternoon and likely dry for next weekend.


most terminals currently with MVFR toVFR ceilings, with a few
exceptions, kgpt currently has sct-bkn009. Little change in
conditions through sunset, then expect MVFR conditions to
predominate through much of Saturday. Winds could be an issue
through the period, especially on east/west oriented runways with
gusts to 25-30 knots likely at most terminals during daytime hours.

Cannot rule out some isolated to scattered convection Saturday
afternoon, but threat not high enough at an individual terminal to
carry almost 24 hours out. 35

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 morning 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 Saturday 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 from Saturday 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.

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 72 88 73 78 / 10 30 20 100
btr 74 89 75 78 / 10 30 20 100
asd 74 86 75 80 / 10 20 20 80
msy 76 87 75 82 / 10 20 10 90
gpt 75 84 76 79 / 10 20 20 70
pql 72 84 74 81 / 10 20 20 50

Lix watches/warnings/advisories
La... Wind advisory from 6 am to 10 pm cdt Saturday for laz034>037-039-

Coastal flood advisory until midnight cdt Sunday night for

Gm... Small craft advisory until 7 am cdt Sunday for gmz530-532-534-

Ms... Wind advisory from 6 am to 10 pm cdt Saturday for msz068>071-077-

Coastal flood advisory until midnight cdt Sunday night for

Gm... Small craft advisory until 7 am cdt Sunday for gmz532-534-536-

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WYCM6 - 8747437 - Bay Waveland Yacht Club, MS 14 mi45 min SE 13 G 16 77°F 77°F1014.8 hPa
42067 - USM3M02 27 mi173 min SE 18 G 21 77°F 4 ft1015.2 hPa75°F
DKCM6 - 8741501 - Dock C, Pascagoula, MS 30 mi45 min SE 14 G 19 77°F 1015.8 hPa
PNLM6 - 8741533 - Pascagoula NOAA Lab, MS 31 mi45 min 78°F
PTBM6 - 8741003 - Petit Bois Island, MS 32 mi45 min ESE 13 G 16 76°F 1016.7 hPa
ULAM6 - 8741041 - Dock E. Port of Pascagoula, MS 33 mi45 min 78°F
RARM6 - 8741094 - Range A rear, Pascagoula, MS 33 mi45 min ESE 9.9 G 16 77°F 1015.7 hPa
SHBL1 - 8761305 - Shell Beach, LA 38 mi45 min ESE 16 G 20 77°F 79°F1014.4 hPa
GDXM6 - Grand Bay Reserve, MS 38 mi108 min SE 17 77°F 1017 hPa74°F
KATA1 - Katrina Cut, AL 48 mi63 min SE 19 76°F 1015.9 hPa

Wind History for Gulfport Outer Range, MS
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Gulfport - Gulfport-Biloxi International Airport, MS13 mi40 minESE 166.00 miFog/Mist78°F75°F90%1015.1 hPa
Keesler Air Force Base / Biloxi, MS18 mi95 minSE 910.00 miOvercast77°F74°F91%1015.8 hPa
Bay St. Louis, Stennis International Airport, MS21 mi4.6 hrsSSE 8 G 157.00 miOvercast79°F71°F79%1013.5 hPa

Wind History from GPT (wind in knots)
Last 24hrS13
1 day agoS10S7S9
2 days agoS8S9S7S9

Tide / Current Tables for Cat Island, Mississippi
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Cat Island
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Sat -- 06:14 AM CDT     Sunrise
Sat -- 09:11 AM CDT     Moonrise
Sat -- 12:59 PM CDT     1.98 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.

Tide / Current Tables for Ship Island, Mississippi Sound, Mississippi
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Ship Island
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Sat -- 06:14 AM CDT     Sunrise
Sat -- 09:10 AM CDT     Moonrise
Sat -- 12:38 PM CDT     2.09 feet High Tide
Sat -- 07:32 PM CDT     Sunset
Sat -- 11:14 PM CDT     Moonset
Sat -- 11:32 PM CDT     -0.29 feet Low Tide
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 (1,6,7,8)
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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.