Saturday, January19, 2019 L-36.com


Marine Weather and Tides
Jamaica Beach, TX

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:12AMSunset 5:47PM Saturday January 19, 2019 9:06 PM CST (03:06 UTC) Moonrise 4:23PMMoonset 5:36AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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GMZ355 Coastal Waters From High Island To Freeport Tx Out 20 Nm- 345 Pm Cst Sat Jan 19 2019
.gale warning in effect until midnight cst tonight...
.small craft advisory in effect from midnight cst tonight through late tonight...
Tonight..Northwest winds 20 to 30 knots and gusty becoming north 20 to 25 knots after midnight. Seas 3 to 5 feet.
Sunday..North winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Seas 2 to 3 feet.
Sunday night..East winds around 5 knots becoming southeast after midnight. Seas 1 to 2 feet.
Monday..Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
Monday night..South winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 7 feet.
Tuesday..South winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 7 feet. A chance of showers.
Tuesday night..South winds around 10 knots becoming northwest 15 to 20 knots after midnight. Seas 3 to 5 feet. Showers likely.
Wednesday..North winds 20 to 25 knots. Seas 3 to 5 feet. Showers likely.
Wednesday night..North winds 15 to 20 knots. Seas 2 to 4 feet. A slight chance of showers.
Thursday..North winds 5 to 10 knots. Seas 2 to 3 feet.
Thursday night..North winds 5 to 10 knots. Seas 1 to 2 feet.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 345 Pm Cst Sat Jan 19 2019
Synopsis for high island to matagorda ship channel out 60 nm.. Strong northwest winds through this evening across the area as high pressure builds into the region. A gale warning is in effect now for all waters. The strong winds will also push water away from the coast and a low water advisory will be in effect for the bays and intercoastal waterway along with strong currents. Winds will subside later tonight and Sunday as high pressure builds toward the western great lakes. Winds quickly turn around to the southeast and strengthen Monday into Tuesday with another strong cold front pushing through early Wednesday.


7 Day Forecast for Marine Location Near Jamaica Beach, TX
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location: 29.2, -94.99     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 192354
afdhgx
area forecast discussion
national weather service houston galveston tx
554 pm cst Sat jan 19 2019

Aviation
Vfr throughout period. Western high pressure nudging eastward will
slacken the offshore pressure gradient and weaken the north flow
to under 10 knots through the early Sunday morning hours. Weak
north flow through the day tomorrow will turn variable to calm
by the late afternoon as high pressure moves overhead. 31

Prev discussion issued 350 pm cst Sat jan 19 2019
discussion...

gusty post-frontal winds have been the feature of today's weather
as skies have largely cleared in the wake of a cold front. Look
for these winds to diminish through the night and tomorrow, with
quiet weather continuing until Tuesday, ahead of another cold
front sweeping through the area Tuesday night. Another reinforcing
front may be possible late in the week.

Near term [through tonight]...

observations show gusty northwesterly northerly winds across the
area. Sustained winds this afternoon range from 15 to 30 mph, with
gusts as high as 40 mph on galveston island. While we are likely
near the peak winds this afternoon, it will take until this
evening for winds to diminish enough to let today's wind advisory
go for most, and strong winds are expected to continue well into
tonight at the coastline and on barrier islands.

On these winds, colder air is surging into the region. Freezing
temperatures are expected tonight for all but the coast, with lows
below 30 degrees forecast north of houston. Fortunately, it
appears that the coldest post-frontal air will have moved off to
the east before sunrise, which should largely prevent hard freezes
in our area, though that potential cannot be totally ruled out
north of huntsville.

Short term [Sunday through Monday night]...

despite the cold start, clear skies will allow for some fair
heating Sunday, with high temperatures around or a little bit
above 50 degrees for the large majority of the area. Of course,
the flip side to that as the lack of clouds carries into Sunday
night will make for another chilly night into Monday morning.

Fortunately, winds do look to be veering relatively quickly, which
will arrest the fall of temperatures. A brief bout of freezing
temps may be seen again north of houston, but as onshore flow
kicks in towards dawn, we may not see temperatures fall out of the
40s near the coast.

Long term [Tuesday through Saturday]...

of course, a quick shift from offshore flow to onshore flow
frequently signals the development of new low pressure to our west
and another cold front incoming, and this situation is no
different. Lee cyclogenesis looks to occur in SW colorado, dive
down to the panhandles, then begin to eject towards missouri on
Tuesday as an upper trough drops off the rockies. Most models at
least suggest some light streamer showers cropping up on Tuesday -
not sure we'll have enough moisture to pull this off, but between
that and uncertainty in frontal timing, have gone ahead with
chance pops near the coast. The best potential for rain will come
a little bit later as the front attached the aforementioned low
swoops in. The best upper forcing looks to be to our
north northeast, but with a strong low level jet bringing in some
solid gulf inflow into the frontal zone, that seems enough to
bring at least some light to moderate rainfall to the area Tuesday
night into Wednesday. The NAM doesn't really agree, but there's
pretty strong agreement among the globals, so we'll shade that
way.

Temperature-wise, this pattern of course means we'll see warming
Monday and Tuesday ahead of the front, with cooler temperatures
in the back half of the week. This may be bolstered as high
pressure and arctic air surge into the central eastern us behind a
reinforcing cold front. The euro in particular is really
aggressive, with nearly -30c 850mb temperatures at green bay on
Friday. The good news for us is that grb's longitude is already
east of us here in southeast texas, and it appears for now that
the coldest air will miss us to the east. So... While the late week
does look chilly again, i'm not really expecting us to see any
brutal cold... Or even a return of temperatures we're facing
tonight.

Aviation [18z TAF issuance]...

high pressure continues to build into the area with strong gusty
northwesterly winds beneath a sct-ovc MVFR deck near 2700-3500
feet. This deck of clouds should erode from the west and northwest
this afternoon and by 21z should probably only still clip uts.

Winds diminishing from the 18-25g24-34kt this afternoon down to a
more constant 9-15kt around sunset with skc. Stronger winds near
the coast should be the slowest to come down overnight early
Sunday. Sunday looks to beVFR with n-ne winds 5-15 knots
diminishing through the afternoon.

45
marine...

gale warning continues for the utcw bays and offshore through 6 pm
for the bays and midnight gulf waters. SCA kicks in after the gale
wanes. Gradient should support at least wind gusts of gale. Seas
still building and then should start coming down after midnight as
well. Low water advisory in effect and will likely see it most
pronounced between 10 pm and 5 am with a fast drop initially on the
outgoing tide.

After this high pressure slides by quickly which in turn brings back
easterly southeasterly flow and strengthens quickly likely back to
needing a SCA Tuesday prior to the next cold front. The next front
could arrive on the coast as early as midnight to 3 am Wednesday or
more likely 3 am to 6 am. SCA again in the wake of the front.

45

Preliminary point temps pops
College station (cll) 29 52 35 63 55 0 0 0 0 10
houston (iah) 30 52 36 63 57 0 0 0 0 10
galveston (gls) 36 50 46 61 59 0 0 0 0 10

Hgx watches warnings advisories
Tx... Wind advisory until 6 pm cst this evening for the following
zones: austin... Brazos... Burleson... Chambers... Coastal
brazoria... Coastal galveston... Coastal harris... Coastal
jackson... Coastal matagorda... Colorado... Fort bend...

grimes... Houston... Inland brazoria... Inland galveston...

inland harris... Inland jackson... Inland matagorda...

madison... Montgomery... Northern liberty... Polk... San
jacinto... Southern liberty... Trinity... Walker... Waller...

washington... Wharton.

Wind advisory until 10 pm cst this evening for the following
zones: brazoria islands... Galveston island and bolivar
peninsula... Matagorda islands.

Gm... Low water advisory from 11 pm this evening to 6 am cst Sunday
for the following zones: galveston bay... Matagorda bay.

Small craft advisory until 11 pm cst this evening for the
following zones: galveston bay... Matagorda bay.

Gale warning until 6 pm cst this evening for the following
zones: galveston bay... Matagorda bay.

Small craft advisory from midnight tonight to 6 am cst Sunday
for the following zones: coastal waters from freeport to
matagorda ship channel tx out 20 nm... Coastal waters from
high island to freeport tx out 20 nm... Waters from freeport
to matagorda ship channel tx from 20 to 60 nm... Waters from
high island to freeport tx from 20 to 60 nm.

Gale warning until midnight cst tonight for the following zones:
coastal waters from freeport to matagorda ship channel tx
out 20 nm... Coastal waters from high island to freeport tx
out 20 nm... Waters from freeport to matagorda ship channel
tx from 20 to 60 nm... Waters from high island to freeport
tx from 20 to 60 nm.

Discussion... 33
aviation marine... 31


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi36 min NNW 17 G 24 45°F 56°F1023 hPa
LUIT2 11 mi36 min NNW 23 G 28 47°F 56°F1023 hPa
GTOT2 13 mi36 min NNW 19 G 28 47°F 58°F1022.5 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi36 min NNW 24 G 33
EPTT2 - 8771013 - Eagle Point, TX 20 mi36 min NNW 14 G 22
FCGT2 - 8772447 - USCG Freeport, TX 24 mi36 min NNW 5.1 G 13 46°F 59°F1024.3 hPa
FPST2 24 mi36 min NW 15 G 20 46°F 59°F1023.4 hPa
KXIH 25 mi31 min
42035 - GALVESTON 22NM East of Galveston, TX 31 mi26 min NW 27 G 31 49°F 59°F1022.4 hPa39°F
MGPT2 - 8770613 - Morgans Point, TX 33 mi36 min NW 19 G 25 46°F 57°F1022.8 hPa
RLOT2 - 8770971 - Rollover Pass, TX 33 mi36 min NNW 26 G 33 46°F 55°F1021.8 hPa
NCHT2 - 8770777 - Manchester, TX 39 mi36 min NW 7 G 14 45°F 57°F1022.9 hPa
HIST2 42 mi36 min NW 19 G 22
SGNT2 45 mi36 min NW 17 G 24 47°F 55°F1023.5 hPa

Wind History for Galveston Pleasure Pier, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX8 mi14 minNW 19 G 2610.00 miFair and Breezy45°F30°F58%1023.5 hPa

Wind History from GLS (wind in knots)
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1 day agoS6SW9SW8S5SW8SW6SW3CalmCalmSE4SE6SE5E7SE7SE9SE13SE12S13S21
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2 days agoSE10SE8S10SE8S7S11S6S6SW5SW6SW7SW8SW10
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Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
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Sat -- 05:35 AM CST     Moonset
Sat -- 07:08 AM CST     -2.50 knots Max Ebb
Sat -- 07:13 AM CST     Sunrise
Sat -- 11:48 AM CST     0.00 knots Slack
Sat -- 03:22 PM CST     2.60 knots Max Flood
Sat -- 04:21 PM CST     Moonrise
Sat -- 05:46 PM CST     Sunset
Sat -- 10:44 PM CST     -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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-0.5-0.5-0.7-1-1.4-1.9-2.3-2.5-2.4-2.1-1.6-0.80.21.32.12.62.52.11.61.20.80.50.2-0.1

Weather Map and Satellite Images
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GOES Local Image of SouthCentralPlains    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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Wind Forecast for Houston/Galveston, TX (22,6,7,8)
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Ground Weather Radar Station Houston/Galveston, TX
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Gulf Stream Current


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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.