Tuesday, October19, 2021
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Marine Weather and Tides
Indian Head, MD

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:21AMSunset 6:26PM Tuesday October 19, 2021 5:11 PM EDT (21:11 UTC) Moonrise 5:17PMMoonset 5:13AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 437 Pm Edt Tue Oct 19 2021
Rest of this afternoon..W winds 10 kt. Waves 1 ft.
Tonight..W winds 5 kt. Waves less than 1 ft.
Wed..W winds 5 to 10 kt. Waves 1 ft.
Wed night..SW winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Thu night..SW winds 5 to 10 kt. Waves 1 ft.
Fri..NW winds around 5 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 437 Pm Edt Tue Oct 19 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead through Wednesday then slowly shift off shore by early Thursday morning. Multiple cold fronts move through our region late Thursday through Saturday morning. Small craft advisories may be necessary Thursday and Thursday night.


7 Day Forecast for Marine Location Near Indian Head, MD
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location: 38.62, -77.2     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 191907 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 307 PM EDT Tue Oct 19 2021

SYNOPSIS. High pressure over the southeastern states will gradually translate eastward through Thursday. Multiple fronts will cross the area Thursday night through early Saturday. High pressure may return for a time thereafter.

NEAR TERM /THROUGH TONIGHT/. Surface high pressure is centered over the southeastern states this afternoon. Mid/upper level ridging lags over the Mississippi Valley, so northwest flow continues. However, the airmass is quickly modifying, and a dry column is promoting a lack of cloud cover.

Tonight, radiational cooling will once again be a factor, so undercut guidance in outlying areas. Dew points will be edging upward, and some cirrus will cross the area associated with a shortwave trough. Therefore, am not expecting it to be quite as chilly as last night, but still wouldn't rule out a patch or two of frost in the coldest bottoms. Wind just above the nocturnal inversion will remain elevated, so widely varying temperatures across short distances will be possible again.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. The surface high will be sliding off the southeast coast Wednesday and Thursday while upper level ridging crests overhead. This will support a warming trend, with temperatures once again around 10 degrees above normal (mid to even upper 70s are expected for highs). Lows Wednesday night will remain closer to normal as radiational cooling will still have an effect. Very few clouds are expected until a gradual increase in clouds on Thursday ahead of the next system.

The main surface low and shortwave trough will remain well north of the area, tracking through the Great Lakes and St. Lawrence Valley. The trailing cold front will reach the Appalachians during the late afternoon or evening. Thunderstorms are expected over the Ohio Valley, and while it's possible some convection will approach our forecast area, instability will be very meager and storms should be in a weakening state. The highest chance for precipitation with the front will be along the Appalachians. With minimal moisture and convergence, along with a diurnal minimum of any instability, most of the showers should fall apart as they cross the mountains. Carried slight chance PoPs for most areas east of I-81 in case some light showers survive. Otherwise, there will just be an increase in clouds, which will keep temperatures milder.

LONG TERM /FRIDAY THROUGH TUESDAY/. A secondary cold front will push across the region Friday and Friday night. There is a slight chance of showers ahead of and along it Friday afternoon and evening with any showers possibly linger into Saturday morning. High temperatures could occur around midday with near 70 to lower 70s readings east of the Blue Ridge and middle to upper 60s to the west. Temperatures will fall through the 50s Friday night.

High pressure building in from the northwest will bring cooler and drier air Saturday afternoon through Sunday night. Highs each day in the middle 60s and lows in the lower to middle 40s.

A weak disturbance Sunday night and into Monday could bring some increasing clouds and a few showers to parts of the area. Highs on Monday, even cooler, reaching upper 50s to near 60. Temperatures colder in the west and at higher elevations.

AVIATION /19Z TUESDAY THROUGH SUNDAY/. High pressure and a dry air mass will continue to bring VFR conditions through Thursday. Westerly winds 5-10 knots will become southwesterly by Thursday. A cold front will cross the area Thursday night, although impacts will be minimal. MRB could see a brief rain shower or ceiling reduction to MVFR.

VFR conditions Friday through Saturday night. A stray shower or two may not be enough to reduce conditions to MVFR Friday afternoon and evening. Winds southwest around 5 knots Friday becoming light and variable Friday night and Saturday morning. Winds northwest around 10 knots Saturday afternoon and evening.

MARINE. Westerly winds are very marginal in relation to advisory criteria this afternoon, but with occasional gusts to 20 knots nearshore, a combination of advisories and marine statements remain in effect. By this evening, believe that given the forecast wind fields around 1000 ft AGL and cool air over warm waters, any wider expanse of water or those subject to westerly trajectories will see SCA conditions continue (or even increase in some cases). Therefore the advisory remains in effect for some zones. By mid Wednesday morning, sub-SCA conditions should prevail as high pressure slowly moves off the southeast coast.

Southwesterly winds will take hold by Thursday, and a low pressure system will move through the Great Lakes. A cold front will reach the waters late Thursday night or possibly Friday. A Small Craft Advisory may be needed during this time for portions of the waters as winds increase ahead of the front.

No marine hazards expected Friday and Saturday. Winds southwest 5 to 10 knots Friday and evening. Winds light becoming northwest 10 knots Saturday and Saturday night.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 9 AM EDT Wednesday for ANZ531-532- 539. Small Craft Advisory until 6 PM EDT this evening for ANZ538. Small Craft Advisory until 5 AM EDT Wednesday for ANZ530-533- 534-537-540-541-543.

SYNOPSIS . ADS NEAR TERM . ADS SHORT TERM . ADS LONG TERM . KLW AVIATION . ADS/KLW MARINE . ADS/KLW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 20 mi72 min W 7G9.9 74°F 68°F1017.7 hPa (-2.3)
NCDV2 22 mi72 min WSW 6G7 71°F 67°F1018.3 hPa (-2.0)
44062 - Gooses Reef, MD 42 mi48 min W 14G19 67°F 69°F1 ft1019.9 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi72 min W 8.9G11 71°F 70°F1018.5 hPa (-2.0)
TPLM2 - Thomas Point, MD 45 mi72 min W 14G17 70°F 68°F1018.6 hPa (-2.4)
44063 - Annapolis 46 mi48 min WNW 16G18 69°F 68°F1 ft1018.9 hPa
APAM2 - 8575512 - Annapolis, MD 46 mi72 min WSW 5.1G9.9 71°F 69°F1017.3 hPa (-2.2)
COVM2 - 8577018 - Cove Point LNG Pier, MD 46 mi72 min SW 8.9G13 69°F 1018.6 hPa (-2.1)
PPTM2 - 8578240 - Piney Point, MD 49 mi72 min NW 8.9G11

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi16 minSW 510.00 miFair73°F43°F34%1018.6 hPa
Quantico Marine Corps Airfield - Turner Field, VA9 mi16 minWSW 610.00 miFair73°F42°F33%1018.9 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA18 mi16 minSW 510.00 miFair72°F46°F40%1019 hPa
Washington/Reagan National Airport, DC, VA19 mi20 minWNW 910.00 miFair74°F41°F31%1018.2 hPa
Stafford, Stafford Regional Airport, VA20 mi17 minWSW 510.00 miFair74°F36°F25%1020 hPa
Camp Springs / Andrews Air Force Base, MD23 mi16 minSW 810.00 miFair71°F43°F37%1018.2 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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Last 24hrNW8
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NW9000000000000000W3SW4S4W7W6W5SW5
1 day agoW6W10W7W3000000000000W7W9W10NW14
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2 days agoN4NW16
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Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
Click for Map
Tue -- 01:05 AM EDT     0.06 feet Low Tide
Tue -- 06:12 AM EDT     Moonset
Tue -- 06:54 AM EDT     1.75 feet High Tide
Tue -- 07:22 AM EDT     Sunrise
Tue -- 01:22 PM EDT     0.07 feet Low Tide
Tue -- 06:16 PM EDT     Moonrise
Tue -- 06:24 PM EDT     Sunset
Tue -- 07:15 PM EDT     1.84 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Marshall Hall, Maryland
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Marshall Hall
Click for Map
Tue -- 01:42 AM EDT     0.09 feet Low Tide
Tue -- 06:12 AM EDT     Moonset
Tue -- 07:22 AM EDT     Sunrise
Tue -- 07:54 AM EDT     2.55 feet High Tide
Tue -- 02:00 PM EDT     0.09 feet Low Tide
Tue -- 06:16 PM EDT     Moonrise
Tue -- 06:24 PM EDT     Sunset
Tue -- 08:15 PM EDT     2.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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