Friday, April10, 2020
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Marine Weather and Tides
Clear Lake Shores, TX

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:57AMSunset 7:45PM Friday April 10, 2020 2:05 PM CDT (19:05 UTC) Moonrise 9:57PMMoonset 8:01AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 1034 Am Cdt Fri Apr 10 2020
.small craft should exercise caution...
Rest of today..Northeast winds 15 to 20 knots. Bay waters choppy. A slight chance of showers late in the morning.
Tonight..East winds 10 to 15 knots. Bay waters slightly choppy.
Saturday..East winds 10 to 15 knots becoming southeast 15 to 20 knots in the afternoon. Bay waters slightly choppy becoming choppy in the afternoon. A slight chance of showers in the morning. Isolated Thunderstorms. Showers likely in the afternoon.
Saturday night..Southeast winds 15 to 20 knots becoming south 10 to 15 knots after midnight. Bay waters choppy becoming slightly choppy after midnight. A chance of showers early in the evening. A slight chance of showers and Thunderstorms in the late evening and overnight.
Sunday..South winds 15 to 20 knots becoming west in the afternoon. Bay waters choppy. A chance of showers and Thunderstorms in the morning.
Sunday night..West winds 15 to 20 knots becoming northwest after midnight. Bay waters choppy.
Monday..North winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon.
Monday night..Northeast winds 10 to 15 knots increasing to 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight.
Tuesday..Northeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Northeast winds 10 to 15 knots. Bay waters slightly choppy.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1034 Am Cdt Fri Apr 10 2020
Synopsis for high island to matagorda ship channel out 60 nm.. Moderate to strong northeast winds have developed over the coastal waters after yesterdays cold front passage. As a result, caution flags are in effect for the bays and a small craft advisory is in effect for the coastal waters through this evening with winds of around 20 knots and seas up to 6 feet. Winds diminish on Friday evening but increased seas will continue through the night. Seas eventually decrease Saturday with the flow becoming southeasterly, but a second cold front moves through Sunday morning ushering in offshore flow. Winds behind this frontal passage could likely eclipse 20 knots likely leading to additional caution flags or advisories as we head into next week.


7 Day Forecast for Marine Location Near Clear Lake Shores, TX
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location: 29.55, -95     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 101753 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 1253 PM CDT Fri Apr 10 2020

AVIATION.

VFR conditions expected today and tonight. NE winds of 10-15 KTS with higher gusts on occasion today gradually decreasing and becoming E-SE tonight into Saturday morning. Winds over GLS will be in the 15-20 range for most of the TAF period. Another day of SHRA/TSRA expected Saturday morning through much of the day as a warm front moves through SE Texas. There is a potential for strong gusty winds and hail with the stronger storms. 24

PREV DISCUSSION. /ISSUED 1037 AM CDT Fri Apr 10 2020/

UPDATE .

Cloudy skies this morning will continue to lift and clear out some thanks to the drier and cooler air mass moving over in the wake of yesterdays cold front. Breezy, but dry, conditions expected today with high temperatures in the low to mid 70s this afternoon. Tonight, low temperatures will dip into the 50s over areas north of I-10 and into 60s over areas south of I-10.

Enjoy the day southeast Texas!

Forecast continues on track, only minor adjustments to the nearterm temperatures and PoPs have been made. 24

PREV DISCUSSION . /ISSUED 636 AM CDT Fri Apr 10 2020/

AVIATION [12Z TAF Issuance] .

Following the passage of the cold front, winds have shifted around to the northeast this morning and should increase to around 10-15 knots as the day progresses. MVFR to IFR decks still persisting at most terminals, but a lift to VFR conditions is expected by this afternoon as a cooler and drier airmass takes hold across the region. A further eastward shift in wind direction is anticipated as surface high pressure pushes off to the east, with wind speeds dropping off overnight. Showers and thunderstorms begin to once again impact the area by tomorrow afternoon as an upper trough approaches from the west, and a drop back into MVFR to IFR conditions is anticipated.

Cady

PREV DISCUSSION . /ISSUED 517 AM CDT Fri Apr 10 2020/

SHORT TERM [Today through Through Saturday Afternoon] . As the surface cold front has pushed offshore, showers and thunderstorms accompanying its passage have diminished. With northeast winds developing behind the departing boundary, drier and more stable air has started to filter into the region. This will pave the way for a fairly benign weather day today, which will largely feature broken to overcast skies and high temperatures in the low to mid 70s. Look for lows this evening to fall back within climatologically normal values, with areas north of the Houston metro dipping into the low to mid 50s and areas across the metro and along the coast in the 60s (a significant departure from the record or near-record high minimum temperatures seen earlier this week).

A return to more active weather conditions comes on Saturday as an upper trough approaches from the west and a shift back to an onshore flow pattern provides a renewed surge of low-level moisture into SE Texas (should see precipitable water values back around 1.75 inches, within the upper decile of previously observed values in early April). Should see showers and thunderstorms begin to impact the area once again by Saturday morning, with coverage filling in by the afternoon hours. Greatest chance for development looks to be across the northern portion of the CWA given the expected position of the upper trough/associated jet streak, and as a result have maintained higher PoPs within this area. Continued development of showers and storms, with some convection potentially becoming severe, continues on Saturday night (see Long Term section below).

Cady

LONG TERM [Saturday Night Through Friday] . Saturday starts off warm with a strong subtropical jetstream aimed at SETX with s/w moving through the area. By Saturday evening the system should be lifting out over the northern/northeastern counties but the next system is right on it's heels. A 160kt upper jetstreak sweeps in from the southwest and draws in near 70s dewpoints with LLJ strengthening over the Gulf into the coastal areas of SETX. Soundings paint a capped start to the day with a pronounced warm nose 750-850mb over much of the region. This should erode with strong dynamic lift aloft but it may be late morning before it does and we could get dry slotted or mesoscale features from previous round of storms could interfere. SPC has the area in Slight risk early Saturday morning increasing to Enhanced over the areas from Galveston to Houston to Groveton eastward after sunrise. Would anticipate the main severe threats to be damaging winds and hail . but as this system near the Sabine river/LA the tornado threat probably ramps up but that is well east of the CWA by that point. Will go ahead and mention severe storms possible over the north. Still some uncertainty so stay tuned. Will carry the highest POPs generally north of a Columbus to Conroe to Cleveland line on Saturday. Dry air with the Pacific cold front sweeps in during the afternoon and skies should start clearing out and may even get some full sun before the afternoon comes to a close. Sunday evening should be spectacular with the light westerly winds and dry air. By late Sunday evening a Canadian cold front is plunging south and should cross through CLL-CXO by around midnight and off the coast shortly thereafter. Large high builds into TX Monday with dry and cool weather on tap for SETX with some stratus cloud cover that should probably dissipate by noon or early afternoon only to be replaced by high clouds as zonal flow aloft streams in Pacific moisture by Monday evening. Temperatures remain a good deal cooler into Wednesday night before CAA wanes and strengthening LLJ develops Thursday across Central/North TX . warming up over SETX with an increase in cloudiness. Friday looks cooler but how it plays out is a mess given the model solutions . ECMWF has another Canadian cold front plunging through the area early Friday morning with some light rain over the south . GFS more of a mild reinforcing cold front backdooring in with some light rain Fri morning then drying out. ECMWF ensemble has some very cool temperatures in a few members which are almost 7-10 degrees cooler than the GFS. CAA looks to be the consensus . for now have undercut the NBM with falling temperatures Friday afternoon though it could start in the morning.

45

MARINE . As today's surface cold front departs, moderate to strong offshore winds will continue to develop over the coastal waters. As a result, have posted caution flags for the bays and a Small Craft Advisory for the nearshore and offshore waters beginning at 7 AM this morning. Expect winds of around 20 knots and seas in the 4 to 6 foot range to persist through Friday, with speeds decreasing to near- caution levels on Saturday as an onshore wind develops. This decrease is likely to be short-lived as a second cold front approaches the area on Sunday, which will likely once again require caution flags and/or advisories in its wake. Moderate to strong east to northeast winds behind the departing front look to persist at least into the middle of next week.

Cady

CLIMATE . Only one record yesterday . Hobby hit 91 degrees which surpassed the 2019 record high of 90 degrees. These last 3 days have been extremely warm for this point in April . as a matter of fact so warm that Hobby Airport's average temperature over the last 3 days Apr 7, 8, 9th was 80.2 degrees placing 2020 as the warmest 3 days for any 3 day stretch at HOU since records were kept there during the period April 1st through the 9th.

Dates . Average Temperature 2020 04/07-09 . 80.2 (2020 ranks 9th for Apr 01-09 warmest) 2015 04/07-09 . 78.2 1999 04/07-09 . 77.5 1965 04/07-09 . 77.3 (1965 holds the record Apr 01-09 warmest) 1965 04/03-05 . 77.2 1948 04/06-08 . 77.0

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 56 73 64 82 44 / 10 70 60 60 0 Houston (IAH) 57 75 69 84 51 / 0 70 50 60 0 Galveston (GLS) 69 76 72 82 59 / 10 50 30 40 0

HGX WATCHES/WARNINGS/ADVISORIES. TX . NONE. GM . SMALL CRAFT SHOULD EXERCISE CAUTION until 7 PM CDT this evening for the following zones: Galveston Bay . Matagorda Bay.

Small Craft Advisory until 7 PM CDT this evening 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.



Aviation . 24


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi47 min ENE 15 G 17 70°F 76°F1016.2 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi47 min NE 13 G 18 70°F 76°F1017 hPa
GRRT2 18 mi47 min E 16 G 21 70°F 76°F1016.2 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi53 min E 11 G 14 71°F 74°F1016.5 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi53 min ENE 17 G 22 69°F 73°F1015.7 hPa
GTOT2 20 mi47 min 74°F
RLOT2 - 8770971 - Rollover Pass, TX 26 mi47 min ENE 13 G 17 72°F 73°F1017 hPa
HIST2 32 mi53 min NE 7 G 14 70°F 76°F1016.8 hPa
LUIT2 33 mi47 min NE 17 G 21 70°F 74°F1017.7 hPa
42035 - GALVESTON 22NM East of Galveston, TX 38 mi25 min ENE 19 G 23 69°F 74°F1016.1 hPa63°F
FCGT2 - 8772447 - USCG Freeport, TX 45 mi47 min NE 18 G 23 71°F 73°F1016.2 hPa
FPST2 45 mi47 min NE 24 G 26 70°F 75°F1015.6 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi75 minNE 1410.00 miMostly Cloudy72°F55°F57%1016.9 hPa
Houston, Pearland Regional Airport, TX13 mi72 minENE 1110.00 miFair74°F55°F52%1017.4 hPa
Houston, Houston Hobby Airport, TX16 mi72 minNE 1310.00 miOvercast74°F54°F50%1017.3 hPa
Galveston, Scholes Field, TX21 mi73 minNE 13 G 2110.00 miFair73°F55°F55%1017 hPa

Link to 5 minute data for KEFD

Wind History from EFD (wind in knots)
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Last 24hrCalmE6E6E11E11N15
G25
NE4N5N9N4W5NE5NE7NE6CalmN5N8NE10NE10NE8NE10NE17NE10NE14
1 day agoSW7--SW5SW3S5SE10S10S8S6S6S6SW5S3--S5SW5SW5SW6SW8SW5SW7W6W3NW3
2 days agoSW7S9S7S7S10S9S7S6S7S6SE5S7S9S8S6S4S5S6SW7SW5S5S5SW5SW5

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Fri -- 06:35 AM CDT     -0.29 feet Low Tide
Fri -- 06:58 AM CDT     Sunrise
Fri -- 09:01 AM CDT     Moonset
Fri -- 02:05 PM CDT     0.84 feet High Tide
Fri -- 07:44 PM CDT     Sunset
Fri -- 08:04 PM CDT     0.50 feet Low Tide
Fri -- 10:57 PM CDT     Moonrise
Fri -- 11:52 PM CDT     0.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.40.2-0-0.2-0.3-0.3-0.2-00.20.40.60.80.80.80.70.70.60.50.50.50.60.6

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Fri -- 03:45 AM CDT     0.00 knots Slack
Fri -- 06:57 AM CDT     Sunrise
Fri -- 07:15 AM CDT     2.41 knots Max Flood
Fri -- 09:00 AM CDT     Moonset
Fri -- 12:30 PM CDT     -0.00 knots Slack
Fri -- 03:34 PM CDT     -0.72 knots Max Ebb
Fri -- 06:27 PM CDT     -0.38 knots Min Ebb
Fri -- 07:43 PM CDT     Sunset
Fri -- 10:56 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.9-1.7-1.3-0.70.21.222.42.31.91.30.70.2-0.2-0.5-0.7-0.7-0.6-0.4-0.4-0.7-1.1-1.6-2

Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Houston/Galveston, TX (15,3,4,5)
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Ground Weather Radar Station Houston/Galveston, TX
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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 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 numerous 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.