Saturday, February24, 2018 L-36.com


Marine Weather and Tides
Richmond, 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 6:51AMSunset 6:20PM Saturday February 24, 2018 12:02 PM CST (18:02 UTC) Moonrise 12:59PMMoonset 2:02AM Illumination 70% Phase: Waxing Gibbous; Moon at 9 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 Matagorda Bay-galveston Bay- 943 Am Cst Sat Feb 24 2018
Rest of today..South winds near 15 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon. Areas of fog late in the morning. A slight chance of showers and isolated Thunderstorms.
Tonight..South winds 5 to 10 knots becoming west after midnight. Bay waters smooth. Patchy fog. A chance of showers in the evening. Isolated Thunderstorms. Showers after midnight.
Sunday..East winds 5 to 10 knots. Bay waters smooth. Patchy fog in the morning. Showers likely and isolated Thunderstorms.
Sunday night..North winds 5 to 10 knots. Bay waters smooth. A chance of showers in the evening. Isolated Thunderstorms. A slight chance of showers after midnight.
Monday..Northeast winds 5 to 10 knots becoming east in the afternoon. Bay waters smooth.
Monday night..East winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and isolated Thunderstorms.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and isolated Thunderstorms.
Tuesday night..South winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms.
Wednesday night..Southwest winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 943 Am Cst Sat Feb 24 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Elevated onshore winds and waves are expected today, with southerly winds limiting overall fog development this afternoon. Another window for fog development will exist this evening into tonight as a cold front approaches the coast by Sunday morning. The cold front may linger along the coast before finally moving off Monday morning. Periods of fog will remain possible until the cold front clears the coast on Monday.

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 241732
afdhgx
area forecast discussion
national weather service houston galveston tx
1132 am cst Sat feb 24 2018

Update
A wind advisory has been issued for colorado, austin, waller, fort
bend, and brazoria counties and southwestward. The wind advisory
is in effect until 4 pm this afternoon. Observations have shown
sustain winds speeds near 25 mph, with frequent wind gusts above
30 mph. Daytime heating will result in the mixing of these
stronger winds aloft down to the surface. Hazardous travel
conditions will be possible, especially along elevated roadways
and bridges. We will continue to monitor observations for
potential expansion in area of the wind advisory, as well as
monitor trends in observations if conditions look likely to
continue into the early evening hours.

Hathaway

Prev discussion issued 1025 am cst Sat feb 24 2018
update...

starting off your weekend with a muggy Saturday morning, as
southerly winds are helping to keep dew points in the mid 60s to low
70s. Mostly cloudy skies will hold tight throughout the day today,
and expecting high temperatures to reach into the upper 70s. Have
lowered our high temperatures today a tad, to account for this cloud
cover.

Low level winds will increase in speed this morning, helping to mix
out the patchy fog along the nearshore waters and both matagorda
and galveston bays. Additionally, breezy conditions will be felt
across southeast texas today as these low level winds mix down to
the surface. Low level winds speeds will decrease tonight,
allowing for the development of patchy fog to return to the
forecast shortly after sunset. The SREF and hrrr are both
indicating the potential for patchy fog returning to the coastal
waters between 00-06z Sunday.

Upper level water vapor imagery continues to show a long strand of
disturbances, embedded in southwesterly flow aloft helping to act
as a forcing mechanism this morning. Radar imagery is pick up on
some scattered showers producing light rain in the far northern
reaches of our forecast area around college station. Short term
guidance such as the hrrr and texas tech WRF are keeping most of
the shower and isolated thunderstorm activity north of a line
from washington to trinity county. This region will likely see
the best chance for precipitation as we move into the afternoon
hours as an area of low pressure shifts northeast of texas. Still
cannot completely rule out a few isolated strong cells in this
region, as low level instability increases this afternoon, with
surface to 3 km lapse rates approaching 6-6.5 deg c km. Moisture
will also be on tap with precipitable water values ranging between
1.6-1.8 inches. Gusty winds will likely be the main threat
possible beneath some of the stronger storms this afternoon.

Hathaway
discussion...

prev discussion... Issued 453 am cst Sat feb 24 2018
discussion...

onshore winds have brought warm & muggy conditions back to all of
southeast texas. Temperatures will start out above what are
typically normal high temperatures for this time of year.

Galveston should approach a record high (76 set in 2017 1937).

Satellite imagery shows the first in a long train of upper
impulses embedded in the SW flow moving into central texas this
morning. The tail of its associated precip should move into or
close to northern parts of the CWA this morning. A developing
low in the texas panhandle will trek northeastward toward the
midwest later today and drag a dryline front into northern parts
of the area late this afternoon and evening. Expect showers and
thunderstorms to accompany this boundary (more than likely a thin
band by the time it arrives this far south). Can't completely rule
out a few isolated strong cells generally north of a brenham-
livingston line, but best dynamics for severe wx should be
situated well N NE of the area. The front will likely slow stall
before reaching the coast tonight as it loses upper support for a
continued southward push.

Another round of upper disturbances are forecast to move overhead
and parallel to the front late tonight and Sunday. High pw's will
remain pooled along the boundary (1.6-1.9"). This, along with the
threat of some training convection we can't rule out some localized
heavy rainfall. It looks like an initial flare up will likely
occur between 3am-9am along and south of i-10 -- then as the day
wears on possibly expand inland along a zone of convergent flow at
850mb from roughly columbus-trinity. Precipitation should start
tapering off from NW to SE during the evening as the upper disturbances
depart and llvl ridging eventually gives the front a southward
push.

Monday is looking like we'll see some nice wx... Precip-free,
mostly sunny with morning temps in the 50s warming into the mid
70s. Rain chances quickly return on Tuesday and continue into
early thurs with a repeat scenario we've seen lately: warm front
moves in, moisture levels increase, messy SW flow aloft in place,
and approaching upper trof & surface cold front. The cold front
is penciled in for early Thursday with a few days of drier wx
expected in its wake. 47
marine...

per webcams obs, sea fog not quite as problematic this morning as it
was yesterday... Likely due to the stronger onshore low-level winds.

However, will keep current configuration of the marine dense fog ad-
visory in place through it's scheduled expiration time. And speaking
of these stronger winds, will also maintain the scec for the coastal
waters offshore... But will also be expecting winds over the bays and
nearshore waters to pick up through this morning afternoon. The scec
could be expanded to include these areas. At this time, will probab-
ly hold off on re-issuing the marine dense fog advisory for the bays
and nearshore waters tonight as other features come into play.

All of this is setting the stage for increased showers thunderstorms
tonight tomorrow as a cold front moves into the coastal waters. This
boundary is forecast to stall just off along the coast later tonight
with quite a bit of unsettled weather accompanying it for sun. A re-
inforcing surge of cooler drier air late Sun night early Mon morning
is then expected to push the front into the near offshore waters for
mon. This should extend the break from sea fog a bit more, but, alas
the pattern changes once again on Tue as the front returns as a warm
front. Onshore winds returning moisture should help set things up as
the lower visibilities return tues night weds. Will have to wait and
see if extended guidance of a strong cold front on thurs hold true.

41
aviation...

strong onshore winds at just above the surface (so far) this morning
are helping to keep CIGS around MVFR. Not expecting issues with vis
fog the rest of the morning, but have noticed an uptick with showers
developing across the central northern portions of the CWA (via this
strong waa). As such, will likely keep the mention of vcsh for sites
sgr hou northward through the rest of this morning early afternoon.

A mix of MVFRVFR for this afternoon early evening... With increasing
rain chances from the north (to south) as the cold front pre-frontal
trough approaches moves across the area. This boundary is then fore-
cast to reach the coast by 12z tomorrow and stall... With the mention
of shra tsra likely persisting in the lbx gls tafs. 41

Preliminary point temps pops
College station (cll) 77 54 67 48 73 70 20 60 20 0
houston (iah) 79 61 67 53 74 40 60 80 30 10
galveston (gls) 77 65 70 61 69 20 80 60 50 10

Hgx watches warnings advisories
Tx... Wind advisory until 4 pm cst this afternoon for the following
zones: austin... Brazoria... Colorado... Fort bend... Jackson...

matagorda... Waller... Wharton.

Gm... Small craft should exercise caution until 6 pm cst this evening
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... 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... 08


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 28 mi45 min S 11 G 21 76°F 69°F1013.3 hPa
MGPT2 - 8770613 - Morgans Point, TX 41 mi45 min S 8.9 G 16 74°F 67°F1014.8 hPa
EPTT2 - 8771013 - Eagle Point, TX 45 mi45 min S 20 G 25 74°F 72°F1015.1 hPa
LUIT2 48 mi45 min S 9.9 G 14 72°F 1014.9 hPa
GRRT2 49 mi45 min SSE 13 G 19 73°F 74°F1015.3 hPa
FCGT2 - 8772447 - USCG Freeport, TX 50 mi45 min SSE 11 G 13 72°F 69°F1015.3 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 mi70 minS 23 G 2910.00 miMostly Cloudy and Windy79°F68°F69%1013.9 hPa
Houston Southwest Airport, TX15 mi68 minS 11 G 1710.00 miMostly Cloudy76°F67°F74%1014.9 hPa
Houston Executive Airport, TX17 mi68 minS 20 G 289.00 miMostly Cloudy and Breezy79°F68°F70%1013.9 hPa
John Dunn Helistop, TX21 mi68 minSSE 15 G 239.00 miPartly Cloudy77°F68°F74%1013.9 hPa

Wind History from SGR (wind in knots)
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Last 24hrSE15SE14SE14
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1 day agoN4NW3N4NW5NW4N4NW3NW5NW6NW6N5N3NW3NW5NW4N4NE3NE3NE4CalmCalmSE6S8SE13
G18
2 days agoN5N7NW10N9N11
G18
N10N7NW5N8N8NW9N7N9N5N8N8N7NE10N6N7N5N4NW5NW4

Tide / Current Tables for Houston Ship Channel, Galveston Bay, Manchester, Texas
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Houston Ship Channel
Click for Map
Sat -- 12:48 AM CST     0.86 feet High Tide
Sat -- 01:59 AM CST     Moonset
Sat -- 06:51 AM CST     Sunrise
Sat -- 09:59 AM CST     -0.35 feet Low Tide
Sat -- 12:56 PM CST     Moonrise
Sat -- 06:16 PM CST     Sunset
Sat -- 07:06 PM CST     1.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.90.80.70.60.40.2-0-0.2-0.3-0.4-0.3-0.20.10.40.60.911.11.21.11.111

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Sat -- 12:21 AM CST     0.40 feet Low Tide
Sat -- 01:58 AM CST     Moonset
Sat -- 02:19 AM CST     0.41 feet High Tide
Sat -- 06:51 AM CST     Sunrise
Sat -- 11:23 AM CST     -0.45 feet Low Tide
Sat -- 12:56 PM CST     Moonrise
Sat -- 06:16 PM CST     Sunset
Sat -- 09:09 PM CST     0.51 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.40.40.40.30.1-0-0.2-0.3-0.4-0.4-0.4-0.4-0.2-0.10.10.30.40.50.50.50.50.5

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

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Houston/Galveston, TX (13,3,4,5)
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Ground Weather Radar Station Houston/Galveston, TX
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weather_mapweather_map weather_map

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.