Tuesday, March2, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Frederick, MD

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 6:38AMSunset 6:04PM Tuesday March 2, 2021 6:33 PM EST (23:33 UTC) Moonrise 10:09PMMoonset 8:47AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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
    EDIT      (on/off)   Help
ANZ538 Patapsco River Including Baltimore Harbor- 342 Pm Est Tue Mar 2 2021
Rest of this afternoon..NW winds 10 kt. Waves 1 ft.
Tonight..SW winds 5 to 10 kt. Waves 1 ft.
Wed..W winds 5 to 10 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Thu night..NW winds 10 to 15 kt. Waves 1 ft.
Fri..NW winds 10 to 15 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft or less.
ANZ500 342 Pm Est Tue Mar 2 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will continue to build overhead through tonight. Low pressure will pass well to the south Wednesday. A reinforcing cold front will cross the area Wednesday night. Canadian high pressure will build toward the region Thursday through Saturday. Small craft advisories may be required at times for portions of the waters Thursday and Friday.


7 Day Forecast for Marine Location Near Frederick, MD
   Hourly   EDIT   Help
location: 39.43, -77.41     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 021939 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 239 PM EST Tue Mar 2 2021

SYNOPSIS.

High pressure remains in control through this weekend with a brief wave of precipitation possible along the Allegheny front early on Thursday. Mostly Dry conditions expected through early next week.

NEAR TERM /THROUGH TONIGHT/.

Winds are slowly tapering off this afternoon as high pressure slowly builds overhead. Clear skies along with cool conditions are expected to continue through this evening. Although there will be increased mixing today due to mostly sunny conditions, cold air advection aloft will lead to afternoon temps in the low to mid 40s. Light winds along with areas of decent radiational cooling will lead to overnight lows in the 20s to lower 30s but some elevated winds will prevent overnight lows from falling further this evening.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/.

A split flow aloft will shift eastward on Wednesday with high pressure remaining situated over our region. A shortwave will move south of our region on Wednesday with a surface low impacting parts of southern Virginia and down into the Carolinas. Precipitation from this system will stay well south of our region with temperatures expected to trend upward into the 50s on Wednesday.

A shortwave over the upper plains will drop southeastward into the northwest portions of our region late Wednesday into early Thursday. A combination of a west to northwesterly flow along with the lift from the shortwave will lead to some potential wintry mix showers along the Allegheny front. Some freezing rain and snow showers can't be ruled out with this wave during the early morning periods on Thursday with minimal accumulations expected along the mountains. After the shortwave drops south of our region Thursday morning, high pressure builds back into our region with dry and below average temperatures expected for the rest of the day and evening.

LONG TERM /FRIDAY THROUGH MONDAY/.

Dry and seasonably chilly conditions will persist Friday as a region of Canadian high pressure builds overhead. This likely suppresses an area of low pressure to the south on Saturday before heading out to sea.

Behind this system, attention then turns to a piece of northern stream energy that will move over the region Saturday night. Current guidance has minimal QPF associated with this feature, but should the piece of energy become stronger, a few rain/snow showers could be possible Saturday night mainly across the western highlands. Confidence in this occurring is low.

A broad area of high pressure will keep temperatures closer to seasonal levels Sunday into Monday before moderating Tuesday as southwest flow returns.

AVIATION /20Z TUESDAY THROUGH SUNDAY/.

Clear skies along with VFR conditions expected through Thursday. Only aviation considerations will be shifting winds from west today to light out of the south on Wednesday and back to west / northwesterly on Thursday.

VFR conditions under northwest winds into Saturday afternoon. Winds could gust to 25 knots Friday into Saturday.

MARINE.

SCA conditions will taper off this afternoon with SubSCA conditions this evening. Marginal 18 to 20 knot winds on Wednesday. Small Craft Advisories are likely for Thursday.

Northwest winds gusting to 20 knots could result in a SCA Friday into Saturday morning.

HYDROLOGY.

The excess runoff from previous rainfall has entered the Potomac River Basin. Flooding is expected across portions of the Potomac River Basin through this evening before water levels subside by Wednesday. An extended period of dry weather is likely to persist for the rest of this week into early next week.

TIDES/COASTAL FLOODING.

Runoff of rain and snowmelt from a couple days ago is heading down the Potomac River, and minor flooding appears likely this evening and again Wednesday morning.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 3 PM EST this afternoon for ANZ530>543. Small Craft Advisory from 10 PM this evening to 6 AM EST Wednesday for ANZ531>533-537-539>541. Small Craft Advisory from 10 PM this evening to noon EST Wednesday for ANZ534-543.

SYNOPSIS . JMG NEAR TERM . JMG SHORT TERM . JMG LONG TERM . CPB AVIATION . JMG/CPB MARINE . JMG/CPB HYDROLOGY . TIDES/COASTAL FLOODING .


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 44 mi165 min WNW 2.9 G 8.9 46°F 43°F1024.4 hPa
BLTM2 - 8574680 - Baltimore, MD 45 mi165 min NNW 6 G 8.9 41°F 41°F1023.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 49 mi165 min NW 8 G 9.9 40°F 1023.7 hPa
FSNM2 49 mi165 min WNW 12 G 14 39°F 1022.9 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
6
PM
7
PM
8
PM
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
Last
24hr
NW8
G13
NW15
G19
NW12
G17
NW8
G14
NW7
G15
NW10
G16
NW9
G20
NW6
G13
NW6
G13
NW11
G16
N7
G12
NW10
G15
N8
G13
N5
G8
NW7
G13
NW8
G17
NW7
G15
NW9
G13
NW7
G13
NW5
G16
W6
G9
NW4
G13
N4
NW3
1 day
ago
NE2
NE2
E1
NE2
NE2
SE1
SE1
NW2
S3
S2
NW1
NW2
W1
SE2
SW1
S4
G8
SE4
N3
G13
NW10
G16
NW8
G13
NW11
G16
NW9
G17
NW12
G23
NW13
G20
2 days
ago
S2
SE1
--
--
--
SW1
--
--
S1
E1
--
S1
--
N1
SE3
E3
G7
E1
G5
SE2
E3
E3
G7
E2
G5
E3
E3
NE2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Frederick Municipal Airport, MD2 mi46 minWNW 410.00 miFair43°F5°F21%1021.7 hPa
Gaithersburg - Montgomery County Airport, MD22 mi37 minW 410.00 miFair39°F8°F28%1023.8 hPa

Link to 5 minute data for KFDK

Wind History from FDK (wind in knots)
7
PM
8
PM
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
Last 24hrNW15
G22
NW15
G22
NW12
G26
NW17
G26
W13
G21
NW11
G16
NW8
G18
NW19
G24
NW11
G22
NW10
G21
NW14
G19
NW11
G20
N8N9NW12
G18
NW8
G18
W12
G19
W6
G15
NW5W9
G14
NW4W4W5W4
1 day agoCalmN4E4CalmN4N3CalmCalmCalmCalmCalmCalmS3CalmCalmW6CalmN15
G25
NW10
G16
NW14
G22
NW13
G22
NW21
G29
NW22
G29
NW26
G34
2 days agoCalmN5CalmNE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm--E4E6SE4E4E7E3E3

Tide / Current Tables for Chain Bridge, D.C.
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Tue -- 05:03 AM EST     -0.17 feet Low Tide
Tue -- 06:39 AM EST     Sunrise
Tue -- 08:45 AM EST     Moonset
Tue -- 10:37 AM EST     3.31 feet High Tide
Tue -- 05:40 PM EST     -0.16 feet Low Tide
Tue -- 06:02 PM EST     Sunset
Tue -- 10:07 PM EST     Moonrise
Tue -- 11:08 PM EST     3.04 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
2.51.81.10.50-0.200.71.82.73.23.32.92.21.50.80.3-0.1-0.10.21.12.12.83

Tide / Current Tables for Chain Bridge, one mile below, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Tue -- 04:58 AM EST     -0.17 feet Low Tide
Tue -- 06:38 AM EST     Sunrise
Tue -- 08:45 AM EST     Moonset
Tue -- 10:32 AM EST     3.31 feet High Tide
Tue -- 05:35 PM EST     -0.16 feet Low Tide
Tue -- 06:02 PM EST     Sunset
Tue -- 10:07 PM EST     Moonrise
Tue -- 11:03 PM EST     3.04 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
2.51.710.4-0-0.20.10.81.82.83.23.32.82.11.40.80.2-0.1-0.10.31.22.22.83

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
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.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.