Tuesday, August4, 2020
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Marine Weather and Tides
Colonial Beach, VA

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 6:11AMSunset 8:16PM Tuesday August 4, 2020 9:49 AM EDT (13:49 UTC) Moonrise 8:17PMMoonset 5:56AM Illumination 100% Phase: Full Moon; Moon at 15 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 914 Am Edt Tue Aug 4 2020
.tropical storm warning in effect...
Rest of today..Tropical storm conditions. N winds 35 to 45 kt with gusts to 60 kt...becoming W 15 to 20 kt with gusts to 30 kt this afternoon. Waves 2 to 3 ft. Showers with a slight chance of tstms late this morning, then a chance of showers with a slight chance of tstms this afternoon.
Tonight..SW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds around 5 kt. Waves 1 ft. A chance of showers and tstms in the afternoon.
Wed night..N winds around 5 kt. Waves 1 ft or less. A chance of showers.
Thu..E winds around 5 kt. Waves 1 ft. A chance of showers.
Thu night..W winds around 5 kt. Waves 1 ft or less. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight.
Fri..E winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms.
Fri night..NW winds around 5 kt. Waves 1 ft. A chance of tstms. Showers likely, mainly in the evening.
Sat..NE winds around 5 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 914 Am Edt Tue Aug 4 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Tropical storm isaias will track across the waters today before moving northeast away from the waters tonight. A stationary boundary will linger southeast of the waters through the second half of the week. Refer to the national hurricane center for the latest regarding the track of isaias.


7 Day Forecast for Marine Location Near Colonial Beach, VA
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location: 38.25, -76.96     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 040807 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 407 AM EDT Tue Aug 4 2020

SYNOPSIS. Tropical Storm Isaias will pass northeastward over the Chesapeake Bay today. Refer to the National Hurricane Center for the latest regarding the track of Isaias. A weak frontal boundary will linger near the area for the middle and latter portion of the week.

NEAR TERM /THROUGH TONIGHT/. Main story is over the next 6-12 hours as Isaias passes northward up the East Coast. Right now the center looks to track near our southern Maryland zones later this morning as it moves up the Chesapeake Bay. Forecast was not significantly altered, with winds gusting to tropical storm force back to I-95 and sustained near the bay. Thus, tropical storm warnings were not changed. Winds will only start to increase near dawn from south to north, with strongest winds near and just after the center passes. With guidance now firmly keeping the heavy rain east of the Blue Ridge, the flash flood watch was cut back in the west, and may need more trimming. Still expect heaviest rain to fall near or just east of I-95 corridor, just west of the center track. Near and just east of the center track, a tornado threat remains, and a tornado watch is out until noon. By later this afternoon, 2 or 3 PM, the system looks likely to have cleared our region with partial clearing and a gusty northwest wind. Some stray instability showers may develop on the back side, but overall, a much nicer afternoon than morning with highs in the 80s. Quiet weather should ensue behind the system tonight, with stray storms dissipating. Lows in the 60s to low 70s.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. A frontal boundary will shift southeastward across the region on Wednesday before making its way back northwest on Thursday. This will keep temps closer to normal for a change. However, the front being nearby will result in spotty showers and t-storms. These will be most likely in our southern zones Wednesday, but may become more widespread further north on Thursday.

LONG TERM /FRIDAY THROUGH MONDAY/. Low pressure will track along a stalled frontal boundary to our southeast on Friday as an upper trough axis and associated shortwave energy lifts across our north. Showers and thunderstorms are expected as a result, with the potential for localized flooding given the antecedent wet conditions in place. Depending on the timing of the shortwave, rain chances may linger into the overnight hours. The trough looks to push through our region on Saturday, helping kick the boundary to our southeast off the coast. Will carry a low end chance of showers/storms Saturday should the aforementioned trough take its time exiting the area. Drier conditions look to take hold the second half of the weekend and into early next week as high pressure as the surface and aloft builds into the region. There may be some diurnally driven showers and storms over the higher terrain, so won't be advertising a POP free forecast, but most locations likely remain on the dry side. Temperatures will stay on the cooler side of climo through the weekend as we reside north of the stalled boundary, with highs in the 80s each day, slowly moderating into early next week, while overnight lows fall back into the 60s.

AVIATION /08Z TUESDAY THROUGH SATURDAY/. Isaias is the main story as IFR cigs/vsby with widespread showers and isolated thunderstorms this morning should lift northeast later this afternoon, with VFR returning. Winds increase with gusts potentially 30-40 knots as the center passes late this morning and midday. After that, an isolated storm could cause a brief reduction in conditions later this afternoon, and again at various times over the following couple of days, but VFR with much lighter winds should prevail.

Potential for episodes of sub VFR conditions will be possible on Friday as a stalled frontal boundary lingers southeast of the terminals and upper disturbance nears, sparking showers and thunderstorms. VFR on Saturday with lower rain chances and decreasing threat for sub VFR conditions. Winds will

MARINE. Tropical Storm Warnings remain in effect through today as Isaias passes northward across the region. Strongest winds will be over the middle bay and lower Potomac, but gusts above 40 knots possible all the way up the Potomac and to the north end of the bay. Much lighter winds with limited if any weather issues other tha isolated t-storms Wednesday and Thursday.

Light east northeast winds will prevail over the marine district Friday through Saturday as a stalled boundary resides to our southeast. Afternoon/evening showers and thunderstorms could yield a gusty wind threat on Friday, potentially requiring the need for Special Marine Warnings.

HYDROLOGY. Isaias will be the main story with widespread heavy rainfall this morning, ending this afternoon. With a better consensus of the heaviest rain staying east of the Blue Ridge, watch was dropped to the west. Heaviest rain still looks to be along I-95 or just east with 3-6 inches widespread. Caveat of note is that the rapid movement of the system could help limit the storm totals a bit, but still too uncertain on this. River flooding may persist for a day or two after this if enough rain gets into the mainstem basins.

TIDES/COASTAL FLOODING. Coastal flood warnings remain in effect for the western shore of the Chesapeake Bay and Washington Southwest Waterfront through tonight. Coastal flood advisories are in effect for the remaining tidal coastline. Latest guidance continues the reduced risk for a large prestorm surge, focusing more on the latter half of the event. It is important to note that shoreline facing the open bay will likely have higher water levels than more protected areas (such as the gauges at Solomons and Straits Point). Also, due to the nature of the surge, the highest water levels may not occur at the normal high tide times. Please reference the latest CFW product or AHPS for more details.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Tropical Storm Warning for DCZ001. Flash Flood Watch through this evening for DCZ001. Coastal Flood Warning from 3 PM this afternoon to 3 AM EDT Wednesday for DCZ001. MD . Tropical Storm Warning for MDZ005-006-011-013-014-016>018- 503>508. Flash Flood Watch through this evening for MDZ003>006-011-013- 014-016>018-503>508. Coastal Flood Advisory from 11 AM this morning to 3 AM EDT Wednesday for MDZ016. Coastal Flood Warning from 11 AM this morning to 3 AM EDT Wednesday for MDZ011-014-017-018. Coastal Flood Warning from 1 PM this afternoon to 3 AM EDT Wednesday for MDZ508. Coastal Flood Advisory from 3 PM this afternoon to 3 AM EDT Wednesday for MDZ013. VA . Flash Flood Watch through this evening for VAZ036>040-050-051- 056-507-508. Tropical Storm Warning for VAZ052>057. Flash Flood Watch through this evening for VAZ031-052>055-057- 501-502-505-506. Coastal Flood Advisory from 11 AM this morning to 3 AM EDT Wednesday for VAZ052-055-057. Coastal Flood Advisory from 3 PM this afternoon to 3 AM EDT Wednesday for VAZ053-054. WV . Flash Flood Watch through this evening for WVZ053. MARINE . Tropical Storm Warning for ANZ530>543.

SYNOPSIS . BKF/RCM NEAR TERM . RCM SHORT TERM . RCM LONG TERM . BKF AVIATION . BKF/RCM MARINE . BKF/RCM HYDROLOGY . RCM TIDES/COASTAL FLOODING . RCM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 6 mi50 min NW 16 G 22 70°F 83°F1002 hPa (-4.0)
PPTM2 - 8578240 - Piney Point, MD 24 mi50 min NNW 36 G 45
SLIM2 - 8577330 - Solomons Island, MD 27 mi50 min SSW 9.9 G 13 76°F 83°F997.4 hPa (-9.3)
COVM2 - 8577018 - Cove Point LNG Pier, MD 32 mi50 min S 18 G 26 997.6 hPa
LWTV2 - 8635750 - Lewisetta, VA 32 mi50 min NW 32 G 40 73°F 81°F998.7 hPa (-5.5)
44062 - Gooses Reef, MD 36 mi26 min Calm G 0 75°F 83°F
BSLM2 - Chesapeake Bay, MD 39 mi140 min N 7 1004 hPa
WASD2 - 8594900 - Washington, DC 43 mi50 min N 11 G 22 70°F 86°F1005.1 hPa (-5.0)
BISM2 - 8571421 - Bishops Head, MD 49 mi56 min S 32 G 39 75°F 81°F996.9 hPa

Wind History for Piney Point, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Marys County Airport, MD22 mi55 minWNW 74.00 miOvercast72°F71°F100%999 hPa

Link to 5 minute data for K2W6

Wind History from 2W6 (wind in knots)
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Last 24hrCalmCalmCalmSW5Calm--CalmCalmCalmCalmCalmCalmCalmW4NW3CalmCalmN3N3N4NE6
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S7SW7S5SW7SW6SW5SW3W3SW5S3SW9CalmW5CalmCalmCalmCalmCalmW4
2 days agoE5NE6E3CalmE4NE3E4E4SE5SE4CalmSE3SE3SE4SE3S3CalmCalmS3CalmS3S4S6SW5

Tide / Current Tables for Colonial Beach, Potomac River, Virginia (2)
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Colonial Beach
Click for Map
Tue -- 03:49 AM EDT     1.94 feet High Tide
Tue -- 06:13 AM EDT     Sunrise
Tue -- 06:56 AM EDT     Moonset
Tue -- 10:20 AM EDT     0.08 feet Low Tide
Tue -- 04:19 PM EDT     1.76 feet High Tide
Tue -- 08:13 PM EDT     Sunset
Tue -- 09:16 PM EDT     Moonrise
Tue -- 10:25 PM EDT     0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.31.61.91.91.71.410.70.40.10.10.40.91.31.61.71.71.410.70.40.20.2

Tide / Current Tables for Broomes Island, 0.4 mile south of, Maryland Current
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Broomes Island
Click for MapFlood direction 290 true
Ebb direction 110 true

Tue -- 12:58 AM EDT     0.55 knots Max Flood
Tue -- 04:33 AM EDT     -0.00 knots Slack
Tue -- 06:11 AM EDT     Sunrise
Tue -- 06:53 AM EDT     Moonset
Tue -- 07:51 AM EDT     -0.65 knots Max Ebb
Tue -- 11:25 AM EDT     0.00 knots Slack
Tue -- 01:50 PM EDT     0.33 knots Max Flood
Tue -- 04:56 PM EDT     -0.00 knots Slack
Tue -- 07:46 PM EDT     -0.40 knots Max Ebb
Tue -- 08:12 PM EDT     Sunset
Tue -- 09:15 PM EDT     Moonrise
Tue -- 10:29 PM EDT     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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0.50.60.50.40.1-0.1-0.4-0.6-0.6-0.6-0.4-0.10.10.30.30.30.2-0-0.2-0.4-0.4-0.3-0.10.1

Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (9,2,3,4)
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Ground Weather Radar Station Sterling, VA
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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.