Saturday, March6, 2021
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Marine Weather and Tides
George Mason, VA

Version 3.4
NOTICE
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 6:32AMSunset 6:08PM Saturday March 6, 2021 12:30 AM EST (05:30 UTC) Moonrise 1:45AMMoonset 11:20AM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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- 939 Pm Est Fri Mar 5 2021
.small craft advisory in effect from 8 am est Saturday through Saturday afternoon...
Rest of tonight..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat night..NW winds 5 kt. Waves less than 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Sun night..N winds 5 kt. Waves less than 1 ft.
Mon..W winds around 5 kt. Waves 1 ft.
Mon night..SW winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
Wed..S winds 5 to 10 kt. Waves 1 ft.
ANZ500 939 Pm Est Fri Mar 5 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will slowly build over the waters through Sunday before moving offshore during the early and middle portions of next week. A small craft advisory may be needed for portions of the waters Saturday night into early Sunday.


7 Day Forecast for Marine Location Near George Mason, VA
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location: 38.84, -77.3     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 060159 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 859 PM EST Fri Mar 5 2021

SYNOPSIS. Strong Canadian high pressure over the Great Lakes will slowly migrate over the region through the weekend before becoming more concentrated over the Mid Atlantic by early next week. Dry and near seasonable temperatures are expected through the weekend before a warming trend ensues by the middle of next week as the high shifts offshore.

NEAR TERM /THROUGH SATURDAY/.

The gusty northwesterly winds have tapered off this evening with a steady 7 to 10 knot wind out of the northwest expected to continue through the overnight periods.

.Previous Discussion.

Mostly clear skies and gusty northwest winds persist this afternoon with wind gusts ranging between 20 to 30 mph across the region. Albeit dry, cooler temperatures today compared to yesterday with highs in the low 40s across the metros, upper 30s over northern MD/ central VA, and upper 20s across the higher terrain. Winds will diminish some early this evening into the overnight hours.

SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/. A large upper level low continues to retrograde over the Canadian Maritimes through Saturday which will keep the surface high over the Great Lakes in place throughout most of the weekend. A cold and gusty NW flow continues through Saturday as a result of the tight gradient. The low will slowly begin to exit off into the North Atlantic Sunday which will allow the high to begin migrating southward over the CWA through early next week. Temperatures will remain just below normal for this time of year through the weekend with cold overnight lows in the 20s and daytime highs in the 40s for most with low 30s across the mountains. A warming trend is expected as we head into the middle of next week.

LONG TERM /MONDAY THROUGH FRIDAY/. The broad trough will move offshore Monday afternoon as a region of surface high pressure builds behind the trough. Staying dry Tuesday into Wednesday as upper-level quasi-zonal flow becomes more southwesterly and the surface high pressure moves off the coast of the Carolina's. High temperatures climb into the low 60s Tuesday and mid-upper 60s Wednesday. By Thursday, H5 heights could approach 575 dm and 850 temps close to 10 C. At the surface, this translates to high temperatures near 70 degrees on Thursday.

Embedded disturbances in the upper-level flow likely stay north of the FA through Wednesday. The opportunity for rain showers returns Wednesday night into Thursday, though some guidance keeps us dry into Thursday night.

AVIATION /02Z SATURDAY THROUGH WEDNESDAY/. VFR conditions are expected to continue through the weekend with high pressure in control. Gusty NW winds around 20-30 kts will continue this afternoon but are expected to diminish some this evening into the overnight hours. Similar conditions are expected Saturday with lesser wind gusts expected Sunday into Monday. VFR conditions and light winds are likely Monday into Tuesday as high pressure builds nearby.

MARINE. Low pressure over eastern Canada and high pressure over the Great Lakes will allow for gusty northwest winds over the waters through Saturday. An SCA is in effect for all of the waters through this evening. The SCA remains in effect overnight for the lower Tidal Potomac River and middle portion of the Bay, before picking back up for all of the waters Saturday. As winds subside going into Sunday chances for additional SCA diminish but may be required at least for portions of the waters late this weekend. Winds likely remain sub-SCA criteria Monday into Tuesday.

FIRE WEATHER. Dry weather will persist through Saturday and the RH values will be low each day (teens and 20s today, and teens/20s over central VA Saturday with 20s and 30s across the rest of the area Saturday). Gusty northwest winds are expected during this time as well, with frequent gusts around 20 to 30 mph for most areas today and 15 to 25 mph for Saturday. As fuels continue to dry out over the next few days, the meteorological conditions may enhance the threat for the spread of wildfires.

Confidence is too low at this time for any headlines since the soils are likely holding onto some moisture due to recent rain and snowmelt, and it will remain chilly as well.

Dry conditions with low humidity will likely continue for Sunday and Monday, but winds should be less due to high pressure building overhead.

Warmer conditions are expected for the middle portion of next week, but there will likely be more atmospheric moisture.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 PM EST Saturday for ANZ531>534- 537-539>541-543. Small Craft Advisory until midnight EST tonight for ANZ530-535- 536-538-542. Small Craft Advisory from 8 AM to 6 PM EST Saturday for ANZ530- 535-536-538-542.

SYNOPSIS . MSS NEAR TERM . MSS/JMG SHORT TERM . MSS LONG TERM . CPB AVIATION . MSS/CPB MARINE . MSS/CPB FIRE WEATHER .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 15 mi43 min NW 6 G 11 38°F 43°F1020.2 hPa
BSLM2 - Chesapeake Bay, MD 32 mi61 min N 4.1 34°F 1019 hPa16°F
NCDV2 39 mi43 min NW 5.1 G 11 37°F 42°F1019.3 hPa
APAM2 - 8575512 - Annapolis, MD 45 mi43 min W 7 G 13 35°F 41°F1018.9 hPa
TPLM2 - Thomas Point, MD 46 mi31 min WNW 11 G 12 35°F 39°F1020.4 hPa (+1.8)14°F
BLTM2 - 8574680 - Baltimore, MD 48 mi43 min N 12 G 23 36°F 40°F1019 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 49 mi43 min NW 18 G 20 36°F 1019.2 hPa
FSNM2 49 mi43 min NW 29 G 33 35°F 1018.4 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA10 mi35 minWNW 14 G 2210.00 miFair37°F9°F30%1020.3 hPa
Washington/Dulles International Airport, DC, VA11 mi39 minNW 1610.00 miFair35°F12°F38%1020.3 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA14 mi35 minN 610.00 miFair35°F12°F38%1021.7 hPa
Washington/Reagan National Airport, DC, VA14 mi39 minNW 13 G 1910.00 miFair37°F13°F37%1020.2 hPa
Leesburg / Godfrey, VA22 mi36 minNNW 14 G 2510.00 miFair34°F14°F44%1020.7 hPa
College Park Airport, MD22 mi36 minNW 10 G 1910.00 miFair35°F8°F32%1020 hPa
Camp Springs / Andrews Air Force Base, MD23 mi35 minNNW 12 G 1710.00 miFair35°F12°F38%1020.2 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi35 minNW 1010.00 miFair37°F13°F37%1021.1 hPa
Gaithersburg - Montgomery County Airport, MD24 mi35 minNW 9 G 1510.00 miFair32°F13°F45%1021.7 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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Last 24hrN6NW4NW8
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W6CalmCalmW6W10
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1 day agoCalmCalmNW3CalmNW3NW3NW5NW6NW8NW9
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW13W7W7W6W6SW3SW6S3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Sat -- 01:44 AM EST     Moonrise
Sat -- 01:54 AM EST     2.69 feet High Tide
Sat -- 06:33 AM EST     Sunrise
Sat -- 08:18 AM EST     0.14 feet Low Tide
Sat -- 11:19 AM EST     Moonset
Sat -- 02:08 PM EST     3.13 feet High Tide
Sat -- 06:06 PM EST     Sunset
Sat -- 09:29 PM EST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.62.72.51.91.30.70.30.20.20.71.52.32.93.132.51.91.40.90.50.20.20.6

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sat -- 01:44 AM EST     Moonrise
Sat -- 01:59 AM EST     2.69 feet High Tide
Sat -- 06:33 AM EST     Sunrise
Sat -- 08:23 AM EST     0.14 feet Low Tide
Sat -- 11:19 AM EST     Moonset
Sat -- 02:13 PM EST     3.13 feet High Tide
Sat -- 06:06 PM EST     Sunset
Sat -- 09:34 PM EST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.12.52.72.521.40.80.40.20.20.61.42.32.93.132.621.40.90.50.20.20.6

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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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