Marine Weather and Tides
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
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|Sunrise 5:48AM||Sunset 8:20PM||Monday May 22, 2017 1:38 PM EDT (17:38 UTC)||Moonrise 2:54AM||Moonset 3:39PM||Illumination 9%|
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|ANZ536 Tidal Potomac From Indian Head To Cobb Island- 1032 Am Edt Mon May 22 2017 |
Rest of today..S winds 5 kt. Waves less than 1 ft. Showers late this morning, then showers with a slight chance of tstms this afternoon.
Tonight..N winds around 5 kt. Waves 1 ft. A chance of showers. Patchy fog. Vsby 1 to 3 nm.
Tue..NE winds 5 to 10 kt. Waves 1 ft. Showers.
Tue night..N winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..SE winds around 5 kt. Waves 1 ft. A chance of showers.
Wed night..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Thu..W winds 5 kt. Waves less than 1 ft. Showers likely in the morning. A chance of showers.
Fri..W winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
|ANZ500 1032 Am Edt Mon May 22 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the area by this evening. High pressure may briefly build in tonight into early Tuesday before a low pressure system moves up near the delmarva coast Tuesday night. Small craft advisories may need to be extended into Tuesday night.
7 Day Forecast for Marine Location Near Colonial Beach, VAHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 221359|
area forecast discussion
national weather service baltimore md/washington dc
959 am edt Mon may 22 2017
A warm front will cross the region this morning. A cold front
will move through the area later today. High pressure will
briefly return Monday night before low pressure develops over
eastern carolina Tuesday and moves northeast off the delmarva
Tuesday night. Upper-level low pressure will linger over the
area Wednesday through Friday.
Near term /until 6 pm this evening/
Warm front remains difficult to pick out this morning, although
other surface features and observations indicate we are still
entrenched within the wedged airmass. A small surface low is
located over caswell county, nc, with the warm front likely
bending back and intersecting the cold front which is entering
the western appalachians. Moderate rainfall is beginning to pull
eastward. Rainfall amounts have been up to two-thirds of an
inch, with possibly a higher stripe near an inch in st. Marys
county... But well less than anything that would produce
Trends this afternoon are more optimistic. The break in the rain
seen over the shenandoah valley should work eastward. Slow
moving cold front will be inching eastward this afternoon,
though it may not reach the i-95 corridor until this evening.
Instability will be limited at best due early precip and clouds.
However, in daytime heating behind the first round of precip,
500-800 j/kg of CAPE will be possible along and east of i-81,
and have entertained a chance of thunder in this area, with any
scattered showers that form along the front. Think
shear/instability will be weak enough to preclude stronger
storms, but trends will need to be monitored. Will be ending
precip chances along with the dry air infiltrating behind the
Temperatures will still have the opportunity to rise into the
70s this afternoon, but how far will depend on the clouds.
Short term /6 pm this evening through Wednesday night/
High pressure will briefly build across the region tonight.
However, the frontal zone won't be all that far offshore, and
clearing unlikely for point east of the blue ridge.
Guidance has, for a couple of cycles now, been inducing
cyclogenesis across the southeastern united states late tonight
near a 500mb shortwave and the right rear quad of the upper
jet. The track of this low will bring rain back to central
virginia and southern maryland by late tonight. The focus will
remain across southern/eastern areas, with a good dose of
associated precipitation though Tuesday.
One difference this cycle though is the compact nature of the
low (tight precip gradient on the northwestern edge) and
progressive speed. That means that precip will be exiting by
Tuesday evening. Have backed off on Tuesday night precip
substantially. Am hesitant to drop pops entirely as current
guidance suggests, but am at a lower confidence "chance".
A closed upper low will be moving south into the mid-west Wednesday
while a sfc low and associated cold front moves eastward across the
ohio valley. A brief period of subsidence is expected across the mid-
atlantic Wednesday leading to mostly dry conditions for most of the
day however instability will increase across the allegheny front
and creep northward into central va Wed afternoon. This may
cause a few showers and thunderstorms to form however confidence is
low through the afternoon. Mostly dry conditions will come to an end
wed evening as rain progresses from south to north across the
mid-atlantic region into Thu morning. Elevated instability is
expected and thunderstorms are possible Wed night.
Long term /Thursday through Sunday/
A cold front will be in vicinity of the mid-atlantic region
Thursday. Showers and a few thunderstorms should be ongoing thu
morning as low pressure rides along the cold front. Depending on the
speed of the front showers and thunderstorms may continue through
the day Thursday. Shear profiles show weak shear and therefore
thunderstorms are expected to be sub-severe. The caveat is that|
heavy rain is possible in thunderstorms. Will need to monitor the
threat if training storms occur.
An upper level trough will move over head thu-thu night. The cold
front should be east of the mid-atlantic region by Fri morning and
northwest flow is expected. Disturbances may move across the region
under the influence of the upper level trough Friday and a chance
for showers exists.
High pressure will build into the mid-atlantic region Friday-
Saturday. Dry weather is expected through Saturday. Low
pressure will move into the ohio valley Sat night and Sun and
showers and thunderstorms are possible during this time.
Aviation /14z Monday through Friday/
Conditions have dropped to ifr in low clouds this morning, and
occasionally vsby in more moderate pockets of rain. This rain is
beginning to pull to the east.
After this initial round of showers, ceilings should gradually
lift. The afternoon will be at least above ifr. By evening,VFR
should prevail. The precise timing of category crossings still a
little bit nebulous. Also, there could be a few more showers in
the afternoon ahead of a cold front, and maybe even a
thunderstorm. Spatial and temporal uncertainties preclude a taf
Vfr for the rest of the TAF period. However, more rain, with
reduced flight categories will return for the morning push
Tuesday. Once again, ifr a good possibility for much of the day,
with improvement in the evening.
Shra/tsra possible Wed night-thu night as a cold front moves across
the terminals. Sub-vfr conditions possible during this time.
Winds have dropped to less than 10 kt. Mixing should be rather
poor today in vicinity of showers. Southerly flow will become
west/northwest this evening with a cold frontal passage. Will
have to monitor the potential of thunderstorms reaching the
waters this evening. At the moment wind fields look light and
storms weak, but localized stronger gusts can't be ruled out
should activity develop.
The pressure gradient will tighten Tuesday as low pressure
moves up the coast. Have raised a small craft advisory for the
mid bay and lower potomac, where the gradient will be the best.
As the situation unfolds, the advisory may need to be expanded
A cold front will cross the waters thu-thu night. Showers and a few
thunderstorms are possible Wed night through Thu night. Winds become
Anomalies have continued to fall to 3/4 foot or less. In
addition, the next tide cycle will be lower astronomically
across all waters. A cold front tonight will bring northwest
winds. Therefore there are no indications that any additional
flooding is imminent. However, a coastal low Tuesday provides
some uncertainty. Guidance ensembles then diverge substantially
Marine... Small craft advisory from 2 pm to 6 pm edt Tuesday for anz533-
near term... Ads/hts
short term... Hsk/hts
long term... Hsk
tides/coastal flooding... Ads/hts
Weather Reporting StationsEDIT (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||6 mi||62 min||SSE 1.9 G 2.9||64°F||69°F||1016.4 hPa|
|PPTM2 - 8578240 - Piney Point, MD||24 mi||62 min||Calm G 1|
|SLIM2 - 8577330 - Solomons Island, MD||27 mi||62 min||Calm G 0||63°F||67°F|
|LWTV2 - 8635750 - Lewisetta, VA||32 mi||62 min||NE 2.9 G 4.1||65°F||69°F||1016.5 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||32 mi||62 min||Calm G 1||62°F||1017.5 hPa|
|44062 - Gooses Reef, MD||36 mi||48 min||ESE 1.9 G 3.9||63°F||1017.5 hPa|
|44042 - Potomac, MD||36 mi||48 min||NNE 1.9 G 3.9||64°F||1015.9 hPa|
|BSLM2 - Chesapeake Bay, MD||39 mi||128 min||SE 2.9||61°F||1017 hPa||59°F|
|WASD2 - 8594900 - Washington, DC||43 mi||62 min||Calm G 1.9||64°F||70°F||1016.7 hPa|
|BISM2 - 8571421 - Bishops Head, MD||49 mi||62 min||Calm G 1||65°F||68°F||1017.1 hPa|
Wind History for Piney Point, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|St Marys County Airport, MD||22 mi||45 min||N 0||10.00 mi||Overcast||63°F||60°F||94%||1017.3 hPa|
Wind History from 2W6 (wind in knots)
|1 day ago||NE||E||NE||NE||NE||E||E||E||NE||E||E||Calm||NE||NE||Calm||NE||E||E||E||E||E||E||E||E|
|2 days ago||SW||SW||S||SW||Calm||SW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Colonial Beach |
Click for Map
Mon -- 12:00 AM EDT 1.95 feet High Tide
Mon -- 03:54 AM EDT Moonrise
Mon -- 05:51 AM EDT Sunrise
Mon -- 06:27 AM EDT 0.24 feet Low Tide
Mon -- 12:16 PM EDT 1.79 feet High Tide
Mon -- 04:38 PM EDT Moonset
Mon -- 06:38 PM EDT 0.05 feet Low Tide
Mon -- 08:18 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Broomes Island |
Click for MapFlood direction 290° true
Ebb direction 110° true
Mon -- 01:22 AM EDT -0.00 knots Slack
Mon -- 03:52 AM EDT Moonrise
Mon -- 04:28 AM EDT -0.49 knots Max Ebb
Mon -- 05:49 AM EDT Sunrise
Mon -- 07:48 AM EDT 0.00 knots Slack
Mon -- 10:11 AM EDT 0.27 knots Max Flood
Mon -- 01:03 PM EDT -0.00 knots Slack
Mon -- 04:14 PM EDT -0.45 knots Max Ebb
Mon -- 04:37 PM EDT Moonset
Mon -- 07:09 PM EDT 0.00 knots Slack
Mon -- 08:17 PM EDT Sunset
Mon -- 10:27 PM EDT 0.55 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Mid-Atlantic EDIT
Wind Forecast for Baltimore, MD/Washington (13,3,4,5)(on/off)  Help
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