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Marine Weather and Tides
Version 3.4 |
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 6:22AM | Sunset 7:56PM | Tuesday August 20, 2019 8:21 PM EDT (00:21 UTC) | Moonrise 9:45PM | Moonset 9:58AM | Illumination 72% |  |
ANZ538 Patapsco River Including Baltimore Harbor- 759 Pm Edt Tue Aug 20 2019
.severe Thunderstorm watch 605 in effect until 9 pm edt this evening...
.small craft advisory in effect from Wednesday afternoon through Wednesday evening...
Tonight..SE winds 5 kt. Waves less than 1 ft. Scattered showers and tstms, mainly this evening.
Wed..S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. Scattered showers and tstms.
Wed night..W winds 5 to 10 kt. Gusts up to 20 kt early in the evening. Waves 1 ft. Scattered showers and tstms.
Thu..W winds 5 kt. Waves flat. A chance of showers and tstms.
Thu night..NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Fri..N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Fri night..N winds 5 kt. Waves less than 1 ft. A chance of showers.
Sat..NE winds 5 kt. Waves less than 1 ft. A chance of showers in the morning.
Sun..E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
.severe Thunderstorm watch 605 in effect until 9 pm edt this evening...
.small craft advisory in effect from Wednesday afternoon through Wednesday evening...
Tonight..SE winds 5 kt. Waves less than 1 ft. Scattered showers and tstms, mainly this evening.
Wed..S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. Scattered showers and tstms.
Wed night..W winds 5 to 10 kt. Gusts up to 20 kt early in the evening. Waves 1 ft. Scattered showers and tstms.
Thu..W winds 5 kt. Waves flat. A chance of showers and tstms.
Thu night..NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Fri..N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Fri night..N winds 5 kt. Waves less than 1 ft. A chance of showers.
Sat..NE winds 5 kt. Waves less than 1 ft. A chance of showers in the morning.
Sun..E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 759 Pm Edt Tue Aug 20 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure in the atlantic will promote a light southerly flow over the region into Wednesday. A cold front will approach the waters late Wednesday night into Thursday and stall near or south of the area into Friday. High pressure will then settle over the area Saturday into Sunday.
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure in the atlantic will promote a light southerly flow over the region into Wednesday. A cold front will approach the waters late Wednesday night into Thursday and stall near or south of the area into Friday. High pressure will then settle over the area Saturday into Sunday.
7 Day Forecast for Marine Location Near Riviera Beach, MD
Hourly EDIT Helplocation: 39.16, -76.53 debug
Area Discussion for - Baltimore, MD/Washington
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 klwx 201904 afdlwx area forecast discussion national weather service baltimore md washington dc 304 pm edt Tue aug 20 2019 Synopsis An upper level disturbance will cross the region this afternoon and evening. A cold front will approach the ohio valley Wednesday, sinking into our area Wednesday night into Thursday, possibly stalling into Friday. Behind the front, high pressure will build over the region for the weekend. Near term through tonight Hot and humid conditions are in place across the region this afternoon with temperatures from the low to mid 90s and dew points in the upper 60s to low 70s. This has led to heat indices from the upper 90s to low 100s, remaining just below heat advisory criteria. This heat and humidity has led to the development of between 1000 and 2000 j kg of mlcape, with in excess of 1000 j kg of dcape. Scattered showers and thunderstorms have initiated mainly on the remnant MCS that is crossing the appalachians early this afternoon. Some additional isolated activity has also developed out ahead of it on sea-breeze or remnant outflow boundaries. A general eastward motion is expected at first as the vort associated with the remnant MCS moves eastward, and this is generally depicted well by the 12z cams. As outflow increases, additional activity will likely develop, and a southward trend in storm development coverage is likely this evening, with the threat shifting from west of the blue ridge at during the mid afternoon to much of central northern va, central northern md, and the metros during the late afternoon and early evening hours, to central va and southern md during the mid to late evening hours. The main severe threat will be locally damaging winds. An isolated incident of flooding due to heavy rain is also possible given slow storm motion and high moisture levels. A downward trend in convection will occur late this evening with partly cloudy skies and isolated showers overnight. Some patchy fog is also possible. Lows will range from the upper 60s to mid 70s. Short term Wednesday through Thursday night Upper vort trough will be on the doorstep by Wednesday morning and will cross the region during the day Wednesday. A surface trough is also expected to cross the region during this time. Instability will be a bit lower due to increased cloud cover and slightly lower temperatures, but additional scattered showers and thunderstorms are expected, with a few isolated thunderstorms possible. Highs will range from the upper 80s to lower 90s. Activity will wane again Wednesday night. Lows in the 70s. The front will shift southward into the region on Thursday, likely crossing much of the area through Thursday night, with continued chances for showers and thunderstorms. Highs will range from the upper 80s to lower 90s. Lows in the 60s to around 70f. Long term Friday through Tuesday The cold front will stall near, or just south of the area on Friday, resulting in yet another chance for scattered showers and thunderstorms throughout the day. One big change will be in the temperatures in humidity, as highs on Friday look to only be in the upper 70s to low 80s, with some guidance even a little cooler up north. Humidity will also drop significantly, with dew points dropping into the low 60s. Overnight lows will be noticeably cooler, ranging from the mid 50s over the higher elevations to the low mid 60s east of the blue ridge. Rain chances will increase the farther south you go, so areas in the central va piedmont and southern md stand the best chance. By Saturday, there still remains some discrepancies between the global guidance, with the GFS clearing the front from the area |
Friday night, resulting in dry weather on Saturday. The ecmwf however, clears the front Saturday morning or early afternoon, resulting in showers early in the day (primarily in the central va piedmont and perhaps southern md). Regardless, thinking that things clear out by noon everywhere on Saturday. Areas farther north likely stay dry all day. Another day with highs in the upper 70s to low 80s, accompanies by low humidity, thanks to cool canadian high pressure building in from the north. Overnight lows again will range from the mid 50s over the higher elevations to the low mid 60s east of the blue ridge. High pressure dominates on Sunday, with temperatures remaining consistent in the upper 70s to low 80s. Will carry slight chance for some showers across central va, but thinking the front should be far enough south by then to be out of our hair. By Monday, some indications of a return flow are shown among the guidance, meaning that the front would begin to lift back north as a warm front potentially. Very low confidence at this point, as the ecmwf keeps the front to the south, while the GFS wants to bring it back north across the region. For now, will keep chance slight chance pops in the forecast. Aviation 18z Tuesday through Sunday Scattered showers and thunderstorms are expected today. While showers and thunderstorms will be scattered in nature, brief reductions in visibility and ceilings are possible and some storms could be strong to severe, with damaging winds and large hail being the primary hazards. Patchy fog may then result in MVFR ifr visibilities overnight. Additional showers and storms can be expected both Wednesday and Thursday afternoon evening as a frontal boundary moves into the region. Again, brief episodes of subVFR conditions will be possible in passing showers storms. Vfr conditions are expected for much of the long term period at every terminal except for cho. Showers and a few thunderstorms are expected on Friday, which will lead to periods of sub-vfr conditions. This could continue into Saturday as well. Marine Gusty showers and storms likely this afternoon and evening over the waters, so if planning on being on the waters ensure you have multiple ways to receive special marine warnings if they are issued. A light southerly flow is expected today and tonight, and will begin to increase Wednesday as a cold front nears to the west. This will likely bring gusts to SCA threshold Wednesday and Wednesday evening, so SCA has been issued. The aforementioned front will slowly makes it way south across the waters late Wednesday night and during the day on Thursday, with continued chances for gusty showers storms. Sub-sca winds expected through the weekend. However, scattered showers and thunderstorms on Friday could lead to some brief gusty winds. Best chance for this activity will be in the central bay and lower tidal potomac. Lwx watches warnings advisories Dc... None. Md... None. Va... None. Wv... None. Marine... Small craft advisory from 1 pm to 7 pm edt Wednesday for anz530-531-535-536-538-539-542. Small craft advisory from 9 am Wednesday to midnight edt Wednesday night for anz532>534-537-540-541-543. Synopsis... Mm near term... Mm short term... Mm long term... Cjl aviation... Mm cjl marine... Mm cjl |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| FSNM2 | 4 mi | 58 min | SW 4.1 G 8 | 81°F | 1016.8 hPa | |||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 4 mi | 52 min | WSW 9.9 G 11 | 82°F | 1016.8 hPa | |||
| BLTM2 - 8574680 - Baltimore, MD | 8 mi | 52 min | SW 5.1 G 7 | 84°F | 1016.4 hPa | |||
| APAM2 - 8575512 - Annapolis, MD | 13 mi | 52 min | 82°F | 1016.5 hPa | ||||
| CPVM2 | 14 mi | 52 min | 83°F | 71°F | ||||
| TCBM2 - 8573364 - Tolchester Beach, MD | 16 mi | 52 min | SSE 1 G 2.9 | 86°F | 1017.1 hPa | |||
| TPLM2 - Thomas Point, MD | 19 mi | 82 min | SSW 8.9 G 9.9 | 82°F | 83°F | 1017.2 hPa (-1.1) | 71°F | |
| BSLM2 - Chesapeake Bay, MD | 28 mi | 112 min | WSW 1 | 77°F | 1016 hPa | 73°F | ||
| WASD2 - 8594900 - Washington, DC | 33 mi | 52 min | W 4.1 G 8 | 85°F | 1017.8 hPa | |||
| 44062 - Gooses Reef, MD | 42 mi | 28 min | W 18 G 19 | 81°F | 1018.7 hPa | |||
| CHCM2 - 8573927 - Chesapeake City, MD | 46 mi | 52 min | S 1.9 G 4.1 | 85°F | 1016.5 hPa | |||
| CA2 - 8571892 - Cambridge, MD | 47 mi | 52 min | S 1 G 6 | 85°F | 1017 hPa |
Wind History for Francis Scott Key Bridge NE Tower, MD
(wind in knots) EDIT (on/off) Help| 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 | 7 PM | 8 PM | |
| Last 24hr | S G10 | S G6 | W | W | W | N | NE | -- | N | N | NE | NE | NE | NE | SE | SE | SE | SE | SE | SE G12 | SE G21 | SW G10 | SW | SW G14 |
| 1 day ago | SE | S | NE | SE G7 | W | SW | SW | SW | S | S | S | W | W | SW | SW | E | E | SE G6 | NW G13 | SE G9 | W G13 | W | SW | |
| 2 days ago | S | S G7 | SW G5 | S | S | S G5 | S | SW G9 | S | S | SW G6 | S | -- | SE | E | SE | W G12 | S G4 | SE | S G8 | SE | S |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Baltimore, Baltimore-Washington International Airport, MD | 8 mi | 88 min | W 8 | 10.00 mi | Mostly Cloudy | 79°F | 72°F | 79% | 1016.4 hPa |
| Baltimore, Inner Harbor, MD | 9 mi | 88 min | no data | mi | 85°F | 70°F | 61% | 1016.7 hPa | |
| Annapolis, United States Naval Academy, MD | 13 mi | 88 min | Var 3 | 10.00 mi | Fair | 86°F | 68°F | 55% | 1016.3 hPa |
| Baltimore / Martin, MD | 14 mi | 97 min | SSE 3 | 10.00 mi | Mostly Cloudy | 84°F | 73°F | 70% | 1017.3 hPa |
| Fort Meade / Tipton, MD | 14 mi | 61 min | SE 6 | 10.00 mi | Partly Cloudy | 72°F | 69°F | 94% | 1017.6 hPa |
| Bay Bridge Field, MD | 17 mi | 62 min | WSW 3 | 10.00 mi | Fair | 82°F | 71°F | 70% | 1016.9 hPa |
| College Park Airport, MD | 24 mi | 59 min | WNW 3 | 10.00 mi | Fair | 73°F | 70°F | 94% | 1017.3 hPa |
Link to 5 minute data for KBWI
Wind History from BWI (wind in knots)
| 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 | 7 PM | 8 PM | |
| Last 24hr | SE | S | W | W | W | N | W | SW | W | Calm | Calm | NE | NE | E | E | E | E | E | E | SE | S G16 | W | SW | |
| 1 day ago | Calm | S | S | Calm | Calm | W | Calm | W | Calm | Calm | Calm | W | W | SW | W | W | W | W | NW G15 | NW | NW | NW | Calm | |
| 2 days ago | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | SE | Calm | SW | Calm | Calm | SW | SE | SE | NE G16 | NE | SE | S | S |
Tide / Current Tables for Fort Carroll, Maryland
EDIT Weekend mode (on/off) (on/off) Help One Week of DataFort Carroll
Click for Map
Tue -- 04:43 AM EDT 0.74 feet Low Tide
Tue -- 06:23 AM EDT Sunrise
Tue -- 10:22 AM EDT 1.60 feet High Tide
Tue -- 10:57 AM EDT Moonset
Tue -- 05:00 PM EDT 0.44 feet Low Tide
Tue -- 07:54 PM EDT Sunset
Tue -- 10:43 PM EDT Moonrise
Tue -- 11:11 PM EDT 1.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 04:43 AM EDT 0.74 feet Low Tide
Tue -- 06:23 AM EDT Sunrise
Tue -- 10:22 AM EDT 1.60 feet High Tide
Tue -- 10:57 AM EDT Moonset
Tue -- 05:00 PM EDT 0.44 feet Low Tide
Tue -- 07:54 PM EDT Sunset
Tue -- 10:43 PM EDT Moonrise
Tue -- 11:11 PM EDT 1.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 1.4 | 1.2 | 1 | 0.9 | 0.8 | 0.7 | 0.8 | 1 | 1.2 | 1.5 | 1.6 | 1.6 | 1.4 | 1.2 | 0.9 | 0.7 | 0.5 | 0.4 | 0.5 | 0.7 | 1 | 1.3 | 1.5 | 1.6 |
Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
EDIT (on/off) Help One Week of DataBaltimore Harbor Approach
Click for Map
Tue -- 12:28 AM EDT -0.00 knots Slack
Tue -- 03:21 AM EDT -0.62 knots Max Ebb
Tue -- 06:20 AM EDT 0.00 knots Slack
Tue -- 06:23 AM EDT Sunrise
Tue -- 09:17 AM EDT 0.61 knots Max Flood
Tue -- 10:57 AM EDT Moonset
Tue -- 12:11 PM EDT -0.00 knots Slack
Tue -- 03:27 PM EDT -0.75 knots Max Ebb
Tue -- 06:37 PM EDT 0.00 knots Slack
Tue -- 07:53 PM EDT Sunset
Tue -- 09:53 PM EDT 0.79 knots Max Flood
Tue -- 10:43 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:28 AM EDT -0.00 knots Slack
Tue -- 03:21 AM EDT -0.62 knots Max Ebb
Tue -- 06:20 AM EDT 0.00 knots Slack
Tue -- 06:23 AM EDT Sunrise
Tue -- 09:17 AM EDT 0.61 knots Max Flood
Tue -- 10:57 AM EDT Moonset
Tue -- 12:11 PM EDT -0.00 knots Slack
Tue -- 03:27 PM EDT -0.75 knots Max Ebb
Tue -- 06:37 PM EDT 0.00 knots Slack
Tue -- 07:53 PM EDT Sunset
Tue -- 09:53 PM EDT 0.79 knots Max Flood
Tue -- 10:43 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 0.2 | -0.2 | -0.5 | -0.6 | -0.6 | -0.4 | -0.1 | 0.2 | 0.5 | 0.6 | 0.6 | 0.4 | 0.1 | -0.3 | -0.6 | -0.7 | -0.7 | -0.5 | -0.2 | 0.1 | 0.5 | 0.7 | 0.8 | 0.7 |
Weather Map and Satellite Images
(on/off) HelpWeather Map
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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Baltimore, MD/Washington (20,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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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. |