Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Richmond, TX

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:53AMSunset 7:59PM Wednesday August 21, 2019 7:19 AM CDT (12:19 UTC) Moonrise 10:42PMMoonset 11:07AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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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GMZ335 Galveston Bay- 313 Am Cdt Wed Aug 21 2019
Today..South winds 5 to 10 knots becoming southeast in the afternoon. Bay waters smooth. A chance of showers late in the morning. A slight chance of Thunderstorms in the late morning and early afternoon. A slight chance of showers early in the afternoon.
Tonight..Southeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms after midnight.
Thursday..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Thursday night..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers in the evening, then a chance of showers after midnight. A slight chance of Thunderstorms late.
Friday..South winds 5 to 10 knots. Bay waters smooth. A chance of showers in the morning. A chance of Thunderstorms. Showers likely in the afternoon.
Friday night..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Saturday..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and a slight chance of Thunderstorms.
Saturday night..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Sunday..South winds 5 to 10 knots. Bay waters smooth. A slight chance of Thunderstorms in the morning. A chance of showers. A chance of Thunderstorms in the afternoon.
Sunday night..South winds around 10 knots. Bay waters smooth to slightly choppy. A slight chance of showers in the evening, then a chance of showers after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 313 Am Cdt Wed Aug 21 2019
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore flow will persist tonight through the remainder of the week as high pressure continues to build into the the central gulf of mexico. Periods of scattered showers and Thunderstorms are expected over the coastal waters the next several days and may result in some brief gusty winds. Winds are forecast to increase towards the end of the week and into the weekend with an increase in shower and Thunderstorm activity.


7 Day Forecast for Marine Location Near Richmond, TX
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location: 29.58, -95.75     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 211115
afdhgx
area forecast discussion
national weather service houston galveston tx
615 am cdt Wed aug 21 2019

Aviation [12z TAF issuance]
Nighttime microphysics imagery not showing a lot in the way of
low clouds over the area this morning with a few showers
beginnning to develop just off the coast. The expectation will be
for a few showers and storms to form inland mainly affecting
klbx ksgr and khou so will keep vcts in tafs for those terminals.

Less certain there will be convection affecting kiah so decided to
go with a vcsh for now with kcxo kuts kcll staying dry.VFR
conditions are expected again overnight into Thursday am. There
looks like an increase in convection for Thursday as moisture
increases from the gulf.

Overpeck

Prev discussion issued 350 am cdt Wed aug 21 2019
Short term [today through Thursday morning]
Water vapor satellite imagery is picking up on a vorticity MAX along
a shearing out trough over the louisiana between 2 ridges. The
stronger ridge has become elongated over the southern plains so
there will be at least some easterly flow aloft over SE texas. There
is still some higher moisture with precipitable water values 1.8 to
2.0 inches over the area. This might be enough moisture to support
an isolated storm or two with day time heating. It will take some
convergence along the sea breeze and heating to get storms to
develop as the atmosphere is not quite as moist or unstable as
yesterday. Upper level ridge looks to be stronger as well with 595dm
to 593dm 500mb heights over the area.

Latest hrrr href WRF model runs seem on track with this kind of
evolution with showers and storms forming in the afternoon mainly
south of i-10 and east of i-69. Like the last couple of days the
main threats from any storms will be locally heavy rainfall causing
street flooding, lightning and gusty winds. Stronger storms could
produce a quick 1-2" of rain with 0.25" to 0.5" more common. With
there being less coverage in shower and thunderstorm activity
expected, high temperatures should be in the mid upper 90s most
areas. Lone exception may be along the coast with low 90s but hedged
towards the mid 90s since storm coverage should be less and
therefore less cloud cover.

Overpeck

Long term [Thursday morning through Tuesday]
The upper level ridge, centered NW of SE tx begins to weaken and
retreat more to the west Thursday. As a result, more widespread
shower and thunderstorm activity is anticipated Thursday, with
precipitable water values (pws) remaining just shy of 2.0 inches
across much of the region, with the better moisture values
concentrated along the coast. The pressure gradient also begins to
tighten slightly in response the the upper level trough that
moves closer to the upper tx coast. Therefore, onshore flow will
continue to advect in better moisture values through the day
Thursday and into Friday.

Friday looks to be the best day for coverage of showers and
thunderstorms. The upper level trough should shift northward into
the NW gulf of mexico before pivoting east on Saturday. As this
area of disturbed weather pushes north, very moist pws translate
with it, rising up to 2.2 to 2.4 inches by Friday afternoon.

Forecast soundings keep the atmosphere uncapped, with the
potential for some gusty winds beneath any stronger storms that
do develop. The best rainfall accumulation totals for the
Thursday through Saturday time frame still remains well to our
east over la and across the gulf waters. At this time still
thinking a possible one to two inches will be possible over the
coastal counties and essentially along and south of i-10. That
said, the main change made to the forecast in this period was to
nudge pops inland down a bit, given the agreement amongst the
global models in terms of coverage. Otherwise, high temperatures
through the rest of the week will still reach into the low to
upper 90s, with cloud cover over the coast maybe keeping temps a
touch cooler.

The nam12 is drying things out a touch faster than the GFS on
Saturday, shifting the upper level trough east quicker than the
ecmwf and GFS in the latest model runs. Regardless, we should
still have enough moisture in place for the typical summertime
like showers and thunderstorms to develop, focusing along the
sea bay breezes. By Monday, the upper level ridge attempts to
build back in from the west, helping to suppress widespread
convection for the start of the work week.

Marine
Light to moderate onshore flow continues across the bays and gulf
waters this morning and should prevail most of the day. Overall
expectation is for a typical summer time pattern with onshore winds
increasing at night and decreasing during the day. Seas should
remain low through the next couple of days. We are going to have to
monitor a tropical disturbance now located over the NW caribbean sea
that should move into the gulf for the end of the week and weekend.

The system at this point may cause a brief increase in winds and
seas Friday into Saturday but conditions may not even increase to
needing small craft exercise caution. We are not expecting any
tropical development.

Overpeck

Preliminary point temps pops
College station (cll) 99 76 98 76 97 10 10 10 0 30
houston (iah) 96 79 94 78 93 30 20 30 10 50
galveston (gls) 93 83 93 84 92 20 20 50 50 50

Hgx watches warnings advisories
Tx... None.

Gm... None.

Aviation... Overpeck


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 28 mi50 min SSW 2.9 G 5.1 81°F 87°F1015.1 hPa
MGPT2 - 8770613 - Morgans Point, TX 41 mi56 min S 2.9 G 5.1 84°F 88°F1015.5 hPa
EPTT2 - 8771013 - Eagle Point, TX 45 mi56 min SSW 6 G 7 84°F 86°F1014.9 hPa
LUIT2 48 mi50 min S 7 G 9.9 84°F 84°F1015.6 hPa
GRRT2 49 mi56 min SW 5.1 G 7 84°F 85°F1015.2 hPa
FCGT2 - 8772447 - USCG Freeport, TX 50 mi56 min S 7 G 8.9 85°F 85°F1016.2 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston, Sugar Land Municipal / Hull Field Airport, TX6 mi87 minN 010.00 miFair76°F75°F100%1015.7 hPa
Houston Southwest Airport, TX15 mi65 minN 02.50 miFog/Mist74°F74°F100%1016.3 hPa
Houston Executive Airport, TX17 mi65 minN 04.00 miFog/Mist75°F75°F100%1016.6 hPa
John Dunn Helistop, TX21 mi65 minN 08.00 miFair81°F75°F84%1015.9 hPa

Link to 5 minute data for KSGR

Wind History from SGR (wind in knots)
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Last 24hrCalmCalmSW5S4S6S10
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Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Wed -- 02:50 AM CDT     0.54 feet High Tide
Wed -- 06:51 AM CDT     Sunrise
Wed -- 07:44 AM CDT     0.36 feet Low Tide
Wed -- 12:04 PM CDT     Moonset
Wed -- 02:30 PM CDT     0.63 feet High Tide
Wed -- 07:54 PM CDT     Sunset
Wed -- 09:30 PM CDT     0.19 feet Low Tide
Wed -- 11:39 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.50.50.50.50.40.40.40.40.40.50.50.60.60.60.60.50.40.30.20.20.20.2

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas (2)
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Clear Lake
Click for Map
Wed -- 02:51 AM CDT     0.71 feet High Tide
Wed -- 06:51 AM CDT     Sunrise
Wed -- 08:15 AM CDT     0.52 feet Low Tide
Wed -- 12:04 PM CDT     Moonset
Wed -- 02:15 PM CDT     0.80 feet High Tide
Wed -- 07:54 PM CDT     Sunset
Wed -- 09:31 PM CDT     0.36 feet Low Tide
Wed -- 11:39 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.60.70.70.70.60.60.50.50.50.60.70.70.80.80.80.70.70.60.50.40.40.40.4

Weather Map and Satellite Images
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wmap_A
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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Wind Forecast for Houston/Galveston, TX (8,2,3,4)
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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.