Wednesday, February21, 2018 L-36.com


Marine Weather and Tides
Surfside Beach, TX

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:52AMSunset 6:17PM Wednesday February 21, 2018 6:54 PM CST (00:54 UTC) Moonrise 10:36AMMoonset 11:54PM Illumination 42% Phase: First Quarter Moon; Moon at 7 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
    EDIT      (on/off)   Help
GMZ355 Coastal Waters From High Island To Freeport Out 20 Nm- 322 Pm Cst Wed Feb 21 2018
.dense fog advisory in effect until 6 am cst Thursday...
Tonight..South winds 10 to 15 knots becoming southeast 5 to 10 knots after midnight. Seas 3 to 4 feet. Patchy fog in the evening. Areas of fog after midnight. Showers likely and a chance of Thunderstorms.
Thursday..Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Seas 2 to 4 feet. A chance of showers and a slight chance of Thunderstorms.
Thursday night..Southeast winds 10 to 15 knots. Seas 3 to 4 feet. A chance of showers and isolated Thunderstorms.
Friday..Southeast winds 5 to 10 knots. Seas 2 to 4 feet. A slight chance of showers and Thunderstorms.
Friday night..Southeast winds 10 to 15 knots. Seas 2 to 4 feet. A slight chance of showers and Thunderstorms.
Saturday..South winds 10 to 15 knots. Seas 3 to 4 feet. A chance of showers and Thunderstorms.
Saturday night..Southwest winds 5 to 10 knots becoming north after midnight. Seas 2 to 4 feet. A chance of showers and Thunderstorms.
Sunday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet. A chance of showers and isolated Thunderstorms.
Sunday night..Northeast winds 10 to 15 knots. Seas 2 to 4 feet. Showers likely and isolated Thunderstorms.
Monday..Northeast winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers.
Monday night..East winds around 10 knots. Seas 2 to 3 feet. A slight chance of showers.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 322 Pm Cst Wed Feb 21 2018
Synopsis for high island to matagorda ship channel out 60 nm.. A weak cold front moving very slowly through the coastal counties will sag out into the nearshore waters and should stall this evening. Areas south of the front may have fog and southerly winds. The front should drift very slowly back north Thursday morning and the fog should spread back into the immediate coast and lower portions of galveston bay. East and southeast winds Thursday afternoon should maintain the possibility of fog. Seas should gradually subside tonight and Thursday with the lighter winds over the area. Onshore flow strengthens Friday followed by a cold front that moves offshore Sunday.

7 Day Forecast for Marine Location Near Surfside Beach, TX
   Hourly   EDIT   Help
location: 29.04, -95.18     debug


Area Discussion for - Houston/Galveston, TX
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus64 khgx 212340
afdhgx
area forecast discussion
national weather service houston galveston tx
540 pm cst Wed feb 21 2018

Aviation [00z TAF issuance]
Messy TAF period continues this evening through tomorrow with
showers, thunderstorms, low ceilings, and sea fog all in play. The
cold front is moving through lbx right now with associated
showers and handful of thunderstorms pushing across the southern
half of the TAF sites. Another round of showers and thunderstorms
is approaching cll from the west, and these may affect the
northern TAF sites over the next several hours. Ifr or lower
ceilings will continue across areas north of the front, with
widely varying ceilings to the south. The front will likely push
through gls and sit just offshore tonight before pushing back
inland tomorrow. The front could get north of iah by around 00z
tomorrow with ceilings improving somewhat with its passage.

Scattered showers are expected again tomorrow with the potential
for thunder looking fairly low for now. Sea fog will likely
continue to plague gls through much of the TAF period, possibly
improving briefly as the front moves through. Any relief will
likely be short-lived as the front pushes right back inland in the
morning. 11

Prev discussion issued 344 pm cst Wed feb 21 2018
discussion...

a rainy, dreary day across southeast texas, but fortunately the
heaviest rains have been isolated, sporadic, and ultimately
not enough to manifest in any flooding issues. Look for rain
chances to wax and wane through the week, but never truly go away
as an active weather pattern continues. The next more significant
shot for rain looks to come this weekend with another cold front,
but at this time the focus for the heaviest rain again looks to
be to our northeast.

Near term [through tonight]...

rain showers are copious across southeast texas this afternoon,
with isolated cells of heavier brief downpours embedded within
generally lighter rain. This pattern is readily apparent in
satellite, radar, and in the sound of rain falling on our roof.

This pattern of rain should generally continue tonight, though
gradually winding down even more in intensity. The heaviest
showers will continue to be in the vicinity of the front, which
should drift down towards the coast overnight. There is one
potential wrench in these plans. Farther west is another cluster
of showers and storms - the models are pretty unanimous in the
bulk of this cluster being yanked far to our north, while the
southern end withers. Given the direction of mid-level flow and
general lack of progged associated vorticity, this seems
reasonable. However, i'm a bit nervous looking at the water vapor
imagery showing pretty solid flow right into the back of a bit of
a leaf structure. Along with that, the hrrr surface wind field
does hint at an outside shot of an MCV feature developing. If this
occurs, all bets are off on that southern precip withering and
maybe even the hard northeast course of the main bulk.

Temp-wise, we should see cooler air continue to reign far inland,
which has already been in place most of the day. As the front
droops coastward, the warmer coastal areas should also start to
cool off. However, with the front ultimately stalling out as
onshore low level flow cuts it off from any baroclinic push... It
might not get quite as cold as you'd think given how much
temperature spread existed across the front at its peak.

Short term [Thursday through Friday night]...

shower and thunderstorm potential continues through the short
term as the front stays mostly around the coast Thursday, and
lifts back north Friday. Meanwhile, little vort maxes subtle
shortwaves are progged to stream through the upper flow, which
will likely modulate when and where the best chances for rain are.

These subtle features are likely to be very difficult to time,
even at this relatively short time range. Tried to highlight where
the best support for vertical motion would be by enhancing pops
a little where the model consensus seems to peg the best chances,
but generally keep broad swaths across the area so as not to
overstep the bounds of uncertainty with these features.

The location of the front will also play havoc with temperatures,
as the temperature gradient seen today continues (to a lesser
magnitude) even into tomorrow's high temperatures, before the
retreat northward results in a warmer day on Friday. Without any
real significant cold advection beyond the shallow surface layer
that will be displaced by the retreating front, Friday should get
pretty warm, particularly in that little band that is closer to
the coast, but far enough inland to escape from any marine
influence.

Long term [Saturday through Wednesday]...

if you're looking for any real change in the forecast for the long
term, well... Keep on looking, as the active pattern continues.

Indeed, with another upper trough and surface low rolling through
the central southern plains, it will mean the arrival of the next
cold front. The timing at this point looks to be a bit faster
Saturday night, and will bring a pretty decent shot at showers and
some thunderstorms. Not expecting quite as much moisture with this
front, as progged precipitable water values are clustered around
1.5 inches, but it's still fairly juicy. Like today's front, and
really, most of the recent fronts, the best potential for heavier
rainfall is likely to be northeast of our area - the upper trough
and its associated surface low get ripped off to the western great
lakes, and we don't see much push of cold air to sustain the cold
front this far south. This should also mean cooler air for the
first half of next week, but nothing particularly brutal, or even
all that winter-like for that matter.

One thing we will want to keep an eye on is if where the front
stalls out. The GFS leaves a very sharp surface trough over the
gulf where the front stalls. Now, as explicitly modeled, it's far
enough offshore that any rain generated there falls way out over
the gulf, and really winds become northeasterly enough that it may
give us a brief period of dryness. But... If the front stalls out
around the coast instead, it would likely make for a considerably
wetter period.

Marine...

winds have increased dramatically along the immediate coast and over
the bays just prior to the cold front. Have hoisted a scec for
galveston bay through 8 pm with the approach of the S W over the
hill country. This should help to nudge the front out into the
coastal waters where it stalls. Fog south of the boundary tonight so
will keep a marine dense fog advisory going in the nearshore waters.

The front lifts back north Thursday morning and could see dense fog
moving back into galveston bay area around 6 am and most likely by
around 10 am. Moist onshore flow strengthens Friday which should
maintain the threat of fog through Sunday morning until the passage
of a pacific cold front.

45
hydrology...

rain over the widespread area has been light enough that area
rivers and streams should react favorably. Crest streamflow via
flash indicates that there may be some small rises in parts of
harris county. A tour of channel status among the harris county
bayou gauges indicates that some have risen a bit, but all are
safely within their banks. We also are watching where heavier
rains are falling to our north northeast, but even there, rain is
not expected to result in sufficient rises downstream in our area
to warrant any worry. We are continuing to monitor rainfall and
gauge status in coordination with our neighbors, the west gulf
rfc, and wpc.

Preliminary point temps pops
College station (cll) 42 57 53 76 64 60 70 70 50 40
houston (iah) 55 71 62 80 67 70 50 50 30 30
galveston (gls) 62 71 64 74 65 70 50 30 20 30

Hgx watches warnings advisories
Tx... None.

Gm... Dense fog advisory until 6 am cst Thursday for the following
zones: coastal waters from freeport to the matagorda ship
channel out 20 nm... Coastal waters from high island to
freeport out 20 nm.

Small craft should exercise caution until 8 pm cst this evening
for the following zones: galveston bay... Waters from
freeport to the matagorda ship channel from 20 to 60 nm...

waters from high island to freeport from 20 to 60 nm.

Discussion... 43
aviation marine... 11


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LUIT2 4 mi55 min S 8 G 13 69°F 1018.2 hPa (+1.1)
FCGT2 - 8772447 - USCG Freeport, TX 9 mi55 min SE 8 G 11 68°F 66°F1018.8 hPa (+1.2)
42043 - GA-252 TABS B 15 mi115 min 9.7 G 12 64°F 60°F1017.9 hPa (+0.6)
GRRT2 24 mi55 min SSE 11 G 14 71°F 73°F1018.6 hPa (+1.4)
GTOT2 28 mi55 min S 6 G 14 71°F 65°F1018.5 hPa (+1.5)
SGNT2 30 mi55 min SSE 7 G 8.9 66°F 71°F1017.8 hPa (+1.2)
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 33 mi55 min SSE 12 G 19 65°F1018.4 hPa (+1.3)
EPTT2 - 8771013 - Eagle Point, TX 34 mi55 min S 15 G 20 73°F 71°F1018.5 hPa (+1.5)
KXIH 36 mi40 min S 17 70°F 70°F
42035 - GALVESTON 22NM East of Galveston, TX 43 mi65 min S 7.8 G 9.7 66°F 61°F4 ft1019.1 hPa (+1.6)66°F
EMAT2 45 mi55 min NNW 14 G 17 73°F1018.2 hPa (+1.9)
MGPT2 - 8770613 - Morgans Point, TX 46 mi55 min WNW 9.9 G 13 63°F 67°F1019.2 hPa (+2.4)
NCHT2 - 8770777 - Manchester, TX 48 mi55 min WNW 5.1 G 8 59°F 67°F1018.9 hPa (+2.4)
RLOT2 - 8770971 - Rollover Pass, TX 48 mi55 min S 8 G 11 68°F 70°F1019 hPa (+1.5)

Wind History for USCG Freeport, TX
(wind in knots)    EDIT      (on/off)   Help
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
Last
24hr
E7
E8
G11
E5
E5
E7
G10
E3
NE1
NE4
E5
E5
E6
E8
E10
G13
E7
G10
E7
G10
SE8
SE9
SE7
SE8
SE11
SE10
SE9
SE7
SE8
G11
1 day
ago
E9
G13
E10
G13
E9
G12
E10
G13
E11
G14
E10
G13
SE11
G16
SE10
G13
SE9
E9
G13
E8
G13
SE9
SE9
E7
G11
E8
E8
G12
E9
E8
G11
E11
G14
E9
G13
E9
G12
E9
G12
E9
G12
E8
G12
2 days
ago
E7
E8
G11
SE10
SE11
SE12
SE11
SE12
SE12
SE11
SE9
SE7
SE9
SE8
SE9
SE8
G13
SE12
SE11
SE10
SE10
G14
E8
E10
G13
E11
G14
E9
G12
E11
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Angleton / Lake Jackson, Brazoria County Airport, TX16 mi62 minNW 104.00 miHeavy Rain Fog/Mist61°F57°F90%1018.8 hPa
Galveston, Scholes Field, TX23 mi63 minSSE 142.00 miFog/Mist73°F71°F94%1018.6 hPa

Wind History from LBX (wind in knots)
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
Last 24hrSE12SE12SE12SE8SE11SE8SE4SE5S5S4S8--SE11S13
G21
S17
G22
S17
G26
S18
G28
S21
G25
S21
G26
S17
G28
S20
G28
S20
G28
S17NW10
1 day agoSE12SE18SE18
G25
SE17
G23
SE15
G23
SE15
G21
SE16SE15
G20
SE18
G25
S18
G23
SE14SE11
G19
SE18
G21
SE15SE17
G24
SE12SE15
G23
SE19
G28
SE20
G30
S22
G32
S21
G32
S21
G30
S16
G24
S15
G24
2 days agoSE6SE8SE9SE11
G17
S17
G26
S15
G23
S14
G21
S15
G22
S15S16S13
G23
S10S11S13S15
G22
S23
G28
S21
G28
S17
G30
S21
G27
SE14
G20
S14
G21
SE12
G19
SE14SE16
G21

Tide / Current Tables for Christmas Bay, Texas
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Christmas Bay
Click for Map
Wed -- 04:11 AM CST     0.01 feet Low Tide
Wed -- 06:53 AM CST     Sunrise
Wed -- 10:36 AM CST     Moonrise
Wed -- 01:44 PM CST     0.45 feet High Tide
Wed -- 04:03 PM CST     0.12 feet Low Tide
Wed -- 06:14 PM CST     Sunset
Wed -- 11:54 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.40.20.1000.10.10.20.20.30.40.40.40.40.30.10.10.20.20.30.40.40.5

Tide / Current Tables for Freeport Harbor, Texas
   EDIT      (on/off)   Help   One Week of Data
Freeport Harbor
Click for Map
Wed -- 12:33 AM CST     -0.21 feet Low Tide
Wed -- 06:54 AM CST     Sunrise
Wed -- 08:04 AM CST     0.73 feet High Tide
Wed -- 10:37 AM CST     Moonrise
Wed -- 12:29 PM CST     0.36 feet Low Tide
Wed -- 06:07 PM CST     0.79 feet High Tide
Wed -- 06:15 PM CST     Sunset
Wed -- 11:54 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.2-0.10.10.20.40.60.70.70.70.60.50.40.40.50.60.70.80.80.80.70.50.3-0

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Houston/Galveston, TX (19,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Houston/Galveston, TX
   (on/off)   Help
weather_mapweather_map weather_map

Gulf Stream Current


Ad by Google

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.