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Marine Weather and Tides
Version 3.4 |
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name. |
| Sunrise 5:50AM | Sunset 8:21PM | Wednesday May 22, 2019 8:39 PM EDT (00:39 UTC) | Moonrise 11:03PM | Moonset 8:00AM | Illumination 84% |  |
ANZ536 Tidal Potomac From Indian Head To Cobb Island- 736 Pm Edt Wed May 22 2019
.small craft advisory in effect from Thursday afternoon through Thursday evening...
Tonight..S winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers and tstms.
Thu night..W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. A chance of showers and tstms.
Fri..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Fri night..NE winds 5 to 10 kt. Waves 1 ft.
Sat..SE winds 5 kt. Waves less than 1 ft.
Sat night..S winds 5 to 10 kt. Waves 1 ft.
Sun..NW winds 5 kt. Waves less than 1 ft. A chance of showers through the night.
Mon..NW winds 5 kt. Waves less than 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
.small craft advisory in effect from Thursday afternoon through Thursday evening...
Tonight..S winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers and tstms.
Thu night..W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. A chance of showers and tstms.
Fri..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Fri night..NE winds 5 to 10 kt. Waves 1 ft.
Sat..SE winds 5 kt. Waves less than 1 ft.
Sat night..S winds 5 to 10 kt. Waves 1 ft.
Sun..NW winds 5 kt. Waves less than 1 ft. A chance of showers through the night.
Mon..NW winds 5 kt. Waves less than 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 736 Pm Edt Wed May 22 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore through tonight. A warm front will approach the waters late tonight before passing through Thursday and a cold front will pass through the waters Thursday night. The cold front will stall out nearby for the rest of the weekend into early next week. A small craft advisory will be needed for the waters Friday, and possibly into Friday night.
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore through tonight. A warm front will approach the waters late tonight before passing through Thursday and a cold front will pass through the waters Thursday night. The cold front will stall out nearby for the rest of the weekend into early next week. A small craft advisory will be needed for the waters Friday, and possibly into Friday night.
7 Day Forecast for Marine Location Near Boswell's Corner, VA
Hourly EDIT Helplocation: 38.54, -77.48 debug
Area Discussion for - Baltimore, MD/Washington
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 klwx 221829 afdlwx area forecast discussion national weather service baltimore md washington dc 229 pm edt Wed may 22 2019 Synopsis High pressure will move offshore through this evening. A warm front will pass through the area late tonight into Thursday. A cold front will approach Thursday night before stalling out nearby for Friday and Saturday. The boundary will likely dissipate Sunday but another cold front will approach from the north and this boundary will likely stall out nearby for the early portion of next week. Unsettled conditions are possible during this time. Near term through tonight High clouds associated with the right entrance of a departing jetmax will gradually thin out this afternoon and evening, allowing for partly to mostly sunny skies. MAX temps will top off in the mid to upper 70s for most locations. A warm front will move into the region late tonight along with a weak upper-level disturbance. There may be just enough lift ahead of the boundary to trigger a few showers and perhaps even a thunderstorm. However, coverage should be isolated to scattered since the lifting mechanism will be weak and instability will be elevated and limited. No severe weather is expected. Min temps will hold in the upper 50s to the lower middle 60s for most areas due to the southerly winds. Short term Thursday through Friday night The warm front will pass through the area Thursday morning. A couple showers and perhaps even an isolated thunderstorm may accompany the frontal passage, but again coverage will be isolated to widely scattered. A west to southwest flow behind the boundary will usher in noticeably warmer and more humid conditions. MAX temps will top off well into the 80s for most areas, and a few locations may even approach 90 degrees. Dewpoints should rise into the 60s for most areas, making it feel more uncomfortable as well. Still keeping a close eye on the potential for severe thunderstorms Thursday afternoon and evening. The warmer and more humid conditions will lead to an unstable atmosphere. The 12z href forecasts mean SBCAPE to be about 1-2kj kg across most of the area with locally higher amounts east of the blue ridge mountains (where dewpoints will be a bit higher east of a pressure trough). Deep layer shear will most likely be around 40 to 50 knots, which is plenty to support the threat of severe thunderstorms. Latest guidance has come into better agreement that an MCS will track across the midwest tonight and then toward our area Thursday morning. The system will likely pass through our area Thursday afternoon and evening, and with the moderate instability and shear in place... The threat for severe thunderstorms is elevated with damaging winds being the primary threat along with large hail. Confidence is still low on exactly how this will play out because it will be highly dependent on the strength of the mcs, which has not developed yet. If the MCS holds together and tracks through our area, then the threat for severe thunderstorms will be enhanced. However, if the MCS dissipates before reaching our area, then popup thunderstorms will still pose a threat for severe weather but it will be more isolated. Latest thinking is that the best chance for more enhanced severe weather will be across our northern and perhaps even central areas... Where height falls are more noticeable and there will be less of an impact from downsloping low-level westerly flow. The actual cold front will drop into our area from the north Thursday night. Convection will dissipate overnight with the loss of daytime heating and a downslope west to northwest flow. The cold front will stall out over central virginia. There will not be much of a temperature gradient with MAX temps ranging from the lower to middle 80s for most areas, but upper 80s to near 90 in central virginia. Dewpoints will mix down into the 50s north of the boundary making it more comfortable compared to Thursday. High pressure will briefly build overhead Friday night, allowing for dry conditions. The boundary will likely push farther south and west likely getting hung up near appalachains. Long term Saturday through Wednesday Mid-upper level flow will be zonal across the eastern conus through the extended forecast period. Consequently, latitudinal variability in frontal positions will be |
constrained. Low pressure will be tracking across canada this weekend, which will drop a cold front across the great lakes toward new england. This front likely will stall; it remains to be seen whether that will be across the forecast area, to the north, or to the south. Regardless, we'll be close enough to the frontal zone for a chance of showers (and some thunderstorms) on most days. Sunday may become the most pronounced of those days, as that will be when frontal forcing collides with a warmer, more humid air mass. Ultimately, forecast temperatures will depend upon resolving fate of that boundary, and it appears that there may be an opportunity for it to be south of the area for at least one day. Aviation 17z Wednesday through Sunday Vfr conditions are expected most of the time through Friday night. An isolated shower or thunderstorm may impact the terminals late tonight into Thursday morning, but severe storms are not expected. There is a better chance for thunderstorms Thursday afternoon and evening. Subvfr conditions are possible along with the possibility for locally damaging winds and large hail. Drier conditions along with a west to northwest flow is expected behind a cold front later Thursday night through Friday. Winds will become light Friday night. Local flight restrictions possible this weekend within showers thunderstorms. Late Sunday appears to be the more likely day for storm development to occur. Marine A southerly flow will strengthen over the waters tonight ahead of a warm front. The warm front will pass through the waters Thursday and a deep mixing layer should allow for breezy conditions Thursday afternoon. A small craft advisory is in effect for the middle portion of the bay and lower tidal potomac river for southerly channeling winds overnight into Thursday morning and an SCA is in effect for the rest of the waters Thursday afternoon and evening. There is a chance for severe thunderstorms Thursday afternoon and evening, with the most likely time being between 4 pm and 8 pm. Confidence in coverage of severe storms is low, but locally damaging wind gusts and large hail are possible later Thursday afternoon and evening. A cold front will stall to the south and west of the waters Friday through Friday night, but an SCA will likely be needed for portions of the waters during this time. South winds will increase Saturday afternoon evening. If ingredients come together, the setup for southerly channeling will be there. It's unclear at this time whether SCA conditions would result. A cold front will drop towards the waters Sunday; however, at this time it does not seem as though the front will make it to the bay potomac. That would keep the preferred mixing on land. Tides coastal flooding A southerly flow will increase over the waters through tonight and this will cause anomalies to increase. Minor flooding is possible for sensitive areas with the high tide cycle late tonight into Thursday morning, but confidence is too low at this time for an advisory. The flow will turn toward the west Thursday night and northwest Friday, causing anomalies to decrease. Lwx watches warnings advisories Dc... None. Md... None. Va... None. Wv... None. Marine... Small craft advisory from midnight tonight to midnight edt Thursday night for anz531>534-537-539>541-543. Small craft advisory from noon Thursday to midnight edt Thursday night for anz530-535-536-538-542. Synopsis... Bjl near term... Bjl jmg short term... Bjl long term... Hts aviation... Bjl hts marine... Bjl hts tides coastal flooding... Bjl |
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 |
| NCDV2 | 28 mi | 45 min | ESE 13 G 15 | 69°F | 74°F | 1022.6 hPa | ||
| WASD2 - 8594900 - Washington, DC | 33 mi | 39 min | S 6 G 7 | 70°F | 71°F | 1023.8 hPa (-0.0) | ||
| 44062 - Gooses Reef, MD | 56 mi | 45 min | S 16 G 18 | 66°F | 1024.4 hPa |
Wind History for Washington, DC
(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 | N G10 | NW | N G8 | N | SW G5 | W | NE G5 | NE G6 | SE | NE | E | NW G4 | NE G5 | E G6 | SE G7 | S G7 | S | S G9 | SW | SW G9 | S | S G9 | S | S |
| 1 day ago | NW | NW | NW G18 | NW G18 | NW G14 | NW G14 | NW G11 | NW G15 | N G11 | NW G8 | NW G15 | NW G12 | NW G13 | NW | N G15 | NW G16 | NW G12 | W G12 | W G13 | NW G14 | NW G14 | NW G9 | NW | NW G11 |
| 2 days ago | S G9 | S G7 | S | S | S G9 | S | S G9 | S G11 | S | S | S | S G9 | SW G9 | S | S | S | W G17 | SW G13 | SW G17 | SW G17 | S G15 | W | NW G12 | NW G8 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Quantico Marine Corps Airfield - Turner Field, VA | 10 mi | 1.7 hrs | SSE 9 | 10.00 mi | Fair | 71°F | 53°F | 53% | 1023.5 hPa |
| Stafford, Stafford Regional Airport, VA | 10 mi | 44 min | E 4 | 10.00 mi | Fair | 67°F | 52°F | 59% | 1024.7 hPa |
| Manassas, Manassas Regional Airport/Harry P. Davis Field, VA | 13 mi | 43 min | SSE 5 | 10.00 mi | Fair | 65°F | 52°F | 63% | 1024.8 hPa |
| Warrenton-Fauquier Airport, VA | 13 mi | 44 min | N 0 | 10.00 mi | Fair | 67°F | 51°F | 56% | 1023.4 hPa |
| Fredericksburg, Shannon Airport, VA | 19 mi | 44 min | ESE 4 | 10.00 mi | Fair | 70°F | 54°F | 57% | 1023.4 hPa |
| Culpeper Regional Airport, VA | 20 mi | 64 min | N 0 | 10.00 mi | Fair | 71°F | 52°F | 52% | 1023.4 hPa |
| Fort Belvoir, VA | 21 mi | 43 min | SE 3 | 10.00 mi | Fair | 66°F | 51°F | 60% | 1024 hPa |
Wind History from NYG (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 | N | N | NW | NW | NW | NW | NW | NW | E | E | E | E | Calm | Calm | Calm | SW | SE | S | S | S | SE | S | ||
| 1 day ago | NW | NW | NW | NW | N | N | N | N | N | N | N G21 | N | N G21 | N G21 | N G19 | N G17 | N | NE | N G16 | N | N | N | N | |
| 2 days ago | SW | SW | S | SW | SW | SW | SW | SW | SW G15 | W | SW G16 | W G19 | SW | SW | SW | SW | W G18 | SW G18 | SW G21 | SW | S | SW G18 | SW G15 | SW |
Tide / Current Tables for Aquia Creek, Virginia
EDIT Weekend mode (on/off) (on/off) Help One Week of DataAquia Creek
Click for Map
Wed -- 03:09 AM EDT 0.03 feet Low Tide
Wed -- 05:52 AM EDT Sunrise
Wed -- 08:59 AM EDT Moonset
Wed -- 09:12 AM EDT 1.43 feet High Tide
Wed -- 03:58 PM EDT -0.07 feet Low Tide
Wed -- 08:19 PM EDT Sunset
Wed -- 09:45 PM EDT 0.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 03:09 AM EDT 0.03 feet Low Tide
Wed -- 05:52 AM EDT Sunrise
Wed -- 08:59 AM EDT Moonset
Wed -- 09:12 AM EDT 1.43 feet High Tide
Wed -- 03:58 PM EDT -0.07 feet Low Tide
Wed -- 08:19 PM EDT Sunset
Wed -- 09:45 PM EDT 0.94 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 |
| 0.5 | 0.4 | 0.2 | 0 | 0.1 | 0.4 | 0.8 | 1.1 | 1.3 | 1.4 | 1.4 | 1.1 | 0.9 | 0.6 | 0.4 | 0.1 | -0.1 | 0.1 | 0.3 | 0.6 | 0.7 | 0.9 | 0.9 | 0.8 |
Tide / Current Tables for Aquia Creek, Virginia (2)
EDIT (on/off) Help One Week of DataAquia Creek
Click for Map
Wed -- 03:28 AM EDT 0.18 feet Low Tide
Wed -- 05:52 AM EDT Sunrise
Wed -- 08:59 AM EDT Moonset
Wed -- 09:32 AM EDT 1.52 feet High Tide
Wed -- 04:19 PM EDT 0.11 feet Low Tide
Wed -- 08:19 PM EDT Sunset
Wed -- 10:15 PM EDT 1.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 03:28 AM EDT 0.18 feet Low Tide
Wed -- 05:52 AM EDT Sunrise
Wed -- 08:59 AM EDT Moonset
Wed -- 09:32 AM EDT 1.52 feet High Tide
Wed -- 04:19 PM EDT 0.11 feet Low Tide
Wed -- 08:19 PM EDT Sunset
Wed -- 10:15 PM EDT 1.33 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 |
| 0.8 | 0.5 | 0.3 | 0.2 | 0.2 | 0.4 | 0.7 | 1.1 | 1.4 | 1.5 | 1.5 | 1.3 | 1 | 0.7 | 0.5 | 0.3 | 0.1 | 0.2 | 0.4 | 0.7 | 1 | 1.2 | 1.3 | 1.3 |
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 Sterling, VA
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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. |