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Marine Weather and Tide Forecast for Dahlgren, VA

February 19, 2025 7:01 AM EST (12:01 UTC) Change Location
Sunrise 6:52 AM   Sunset 5:52 PM
Moonrise 12:00 AM   Moonset 9:58 AM 
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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- 656 Am Est Wed Feb 19 2025

.small craft advisory in effect from Thursday morning through Thursday afternoon - .

.gale warning in effect from Thursday afternoon through late Thursday night - .

Today - N winds 5 to 10 kt. Waves 1 ft. Snow. Vsby 1 to 3 nm.

Tonight - N winds 5 to 10 kt. Waves 1 ft. Snow likely. Vsby 1 to 3 nm.

Thu - NW winds 15 to 20 kt with gusts to 35 kt. Waves 1 ft - . Building to 3 ft in the afternoon. Snow showers. Vsby 1 to 3 nm.

Thu night - NW winds 15 to 20 kt. Gusts up to 35 kt - .diminishing to 25 kt after midnight. Waves 2 to 3 ft.

Fri - NW winds 15 to 20 kt with gusts to 30 kt. Waves 2 ft.

Fri night - NW winds 10 to 15 kt - .diminishing to 5 kt after midnight. Waves 1 ft.

Sat - SW winds around 5 kt. Waves 1 ft.

Sun - W winds around 5 kt. Waves 1 ft.
ANZ500 656 Am Est Wed Feb 19 2025

Synopsis for the tidal potomac and md portion of the chesapeake bay -
an area of low pressure will track to the carolinas and off the east coast through Thursday. High pressure will take over late in the week. A frontal system may approach the area late in the weekend. Small craft advisories may be needed through Friday night.

7 Day Forecast for Marine Location Near Dahlgren CDP, VA
   
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Tide / Current for Dahlgren, Upper Machodoc Creek, Virginia
  
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Dahlgren
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Wed -- 01:07 AM EST     -0.03 feet Low Tide
Wed -- 06:53 AM EST     Sunrise
Wed -- 07:20 AM EST     1.46 feet High Tide
Wed -- 09:57 AM EST     Moonset
Wed -- 01:52 PM EST     0.02 feet Low Tide
Wed -- 05:51 PM EST     Sunset
Wed -- 07:39 PM EST     1.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
        
Sorry tide depth graphs only, please select another station.

Dahlgren, Upper Machodoc Creek, Virginia, Tide feet
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Tide / Current for Upper Cedar Point Light, Potomac River, Maryland
  
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Tide / Current data from XTide NOT FOR NAVIGATION        
Sorry tide depth graphs only, please select another station.

Upper Cedar Point Light, Potomac River, Maryland, Tide feet

Area Discussion for Baltimore, MD/Washington
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FXUS61 KLWX 190901 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 401 AM EST Wed Feb 19 2025

SYNOPSIS
An area of low pressure will track to the Carolinas and off the East Coast through Thursday. High pressure will take over late in the week. A frontal system may approach the area by early next week.

NEAR TERM /THROUGH THURSDAY/
Radar/satellite composite shows low pressure taking shape over the northern Gulf Coast. Main surface low pressure is being drive by a southern stream wave, which will move swiftly to and then offshore of the Carolinas through Thursday.

Low-level fgen was resulting in snow (at least aloft) along and south of the I-64 corridor early this morning. Snow should begin reaching the ground from west to east rather readily through daybreak (a bit earlier in the Alleghenies).

Overnight guidance has come into much better agreement, and also appears to line up with upstream obs at this point. This bolsters confidence in the overall forecast, though there will be a tight gradient on the north end of the snow which leads to somewhat lower confidence across north-central VA into interior southern MD including the southern DC suburbs.

Snow associated with the southern stream low should pivot along the I-64 corridor to southern MD from this morning through this evening before shifting offshore. A pronounced lull is likely in between, before snow showers associated with a trailing northern stream upper low move into the Appalachians late overnight.

Snow showers are expected to press east with the upper low Thursday morning through early afternoon. Light accumulations are likely across the area, even with the higher late February sun angle and time of day given the cold antecedent temps. There is an outside chance this light snow could impinge on the western DC/Batlimore suburbs during the second half of the Thursday AM commute, which will need to be monitored closely.

As the upper low departs Thursday afternoon, winds will increase substantially. Gusts of 30 to as high as 50 mph are possible, especially over the higher elevations.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/
Temperatures will plummet on a blustery northwest wind Thursday night. This likely results in wind chills well below zero over the Appalachians.

Blustery and cold but dry conditions will continue Friday, though upslope snow showers may very well persist Thursday night through Friday. Overall, accumulations look to be somewhat on the lighter side and drawn over a longer period (24 to 36 hours), however will need to monitor any steadier periods of upslope, particularly with and immediately in the wake of the upper low.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
A fairly progressive split flow regime is expected to finish the week, and continuing into the weekend and early next week. On Friday morning, the trailing vorticity from a powerful longwave trough offshore is expected to push off the Delmarva Peninsula. In the wake, the guidance shows a brief period of shortwave ridging dipping down from the Great Lakes. Heading into the upcoming weekend, an upstream southern stream feature generally becomes absorbed while progressing toward the Ohio Valley. This overall lends itself to more northern stream dominance as a series of weak perturbations track through the area. By early next week, the next system of interest begins to take shape over the Upper Midwest. Eventually the associated height falls reach the local area by late Monday into Tuesday morning.

Friday's surface pattern maintains residual tight gradients given a deep low center across the Canadian Maritimes and sprawling high pressure over the Missouri Valley. A brisk northwesterly wind persists before gradients weaken into the weekend. The mentioned ridge of high pressure gradually advances eastward in time before weakening and settling off toward the Mid-South by Sunday. Gradual northern stream amplification draws the next frontal system through the Mid-Atlantic region by early next week. It appears somewhat moisture-starved at this point. Otherwise, the main precipitation threats during this period would be the first half of Friday along the Allegheny Front. This is where continued upslope snow showers are expected before tapering off as heights begin to rise.

The temperature forecast features a chilly start to the work week before numbers creep back up during subsequent days. The northwesterly flow regime largely abates by Saturday with return flow ensuing. Looking into Monday, forecast highs rise back into the low 50s while mid/upper 50s are possible on Tuesday. Given ensemble box-and-whisker plots show relatively low spread, there is reasonable confidence on this expected warm up.

AVIATION /09Z WEDNESDAY THROUGH SUNDAY/
Sub-VFR is likely at CHO, and possible at DCA and IAD generally mid morning through late afternoon as snow pivots by across the southern half or so of the area. VFR will likely return overnight. Winds will be northerly but generally light.

Thursday may actually be the best chance for snow at the metro terminals. During heavier snow showers, could briefly see VSBYs reduced to IFR.

VFR conditions are expected from Friday and into the weekend. Dry weather is anticipated during this period at all terminals. A gusty northwesterly wind does persist on Friday with gusts up to 20 to 30 knots possible. Gradients weaken into the weekend with winds shifting to mainly southerly on Saturday afternoon before turning more west-northwesterly by Sunday.

MARINE
Light northerly flow is expected later today into this evening.
Winds increase late tonight into Thursday and remain elevated through Friday. Gales have been issued for the highest period of winds late Thursday through early Friday. Meanwhile, snow is expected in the vicinity of southern Maryland later today, reducing visibility at times.

Gale conditions may persist into Friday morning, especially over the more southern waters. Although northwesterly winds diminish in strength through the day, Small Craft Advisories will likely be needed through early Friday evening. Sub-advisory caliber winds are anticipated into the weekend as high pressure approaches from the southwest.

TIDES/COASTAL FLOODING
Persistent northwesterly flow has kept water levels lower than normal across the tidal Potomac and western shores of the Chesapeake Bay. As of this morning's low tide, a number of locations are reporting water levels around 1 to 1.5 feet below mean lower low water. Some rebound is expected into the afternoon as locations push toward high tide. Owing to another round of blustery northwesterly winds, tidal anomalies remain rather low the next couple of days.
However, at this point, the forecast does keep water levels just above those requiring another Marine Weather Statement for blowout tides.

LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...Winter Weather Advisory from 1 PM this afternoon to 10 PM EST this evening for MDZ016-018.
Winter Weather Advisory from 1 PM this afternoon to 1 AM EST Thursday for MDZ017.
VA...Winter Weather Advisory from 1 PM this afternoon to 10 PM EST this evening for VAZ055.
Winter Weather Advisory from 1 PM this afternoon to 1 AM EST Thursday for VAZ057.
Winter Weather Advisory from 7 AM this morning to 7 PM EST this evening for VAZ025-036-037-504-508.
Winter Weather Advisory from 10 AM this morning to 10 PM EST this evening for VAZ038-050-056-507.
Winter Weather Advisory until 6 PM EST this evening for VAZ503.
WV...Winter Weather Advisory until 6 PM EST this evening for WVZ505.
MARINE...Small Craft Advisory until 7 AM EST this morning for ANZ530>543.
Small Craft Advisory from 10 PM this evening to 1 PM EST Thursday for ANZ530>534-537-539>541-543.
Gale Warning from 1 PM Thursday to 10 AM EST Friday for ANZ530>534-537-539>541-543.
Small Craft Advisory from 7 AM to 1 PM EST Thursday for ANZ535- 536-538-542.
Gale Warning from 1 PM Thursday to 1 AM EST Friday for ANZ535- 536-538-542.


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
NCDV2 1 mi44 min 21°F 37°F
SLIM2 - 8577330 - Solomons Island, MD 32 mi44 min 22°F 38°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 36 mi44 min 22°F
44062 - Gooses Reef, MD 38 mi38 minN 18G23 21°F 37°F1 ft
BSLM2 - Chesapeake Bay, MD 38 mi92 minNNW 5.1 20°F 30.422°F
LWTV2 - 8635750 - Lewisetta, VA 38 mi44 min 23°F 39°F
WASD2 - 8594900 - Washington, DC 39 mi44 min 21°F 39°F
44042 - Potomac, MD 43 mi38 minNNW 14G19 22°F


Wind History for Piney Point, MD
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Airport Reports
   
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KNYG QUANTICO MCAF /TURNER FIELD,VA 19 sm5 minNNW 0710 smOvercast21°F1°F42%30.47
KEZF SHANNON,VA 21 sm6 minN 08Overcast21°F-0°F38%30.44
KRMN STAFFORD RGNL,VA 22 sm6 minN 0710 smOvercast21°F-0°F38%30.43

Weather Map
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GEOS Local Image of Mid-Atlantic  
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Sterling, VA,





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