Tuesday, July27, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Kemps Mill, 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 6:04AMSunset 8:30PM Tuesday July 27, 2021 1:36 AM EDT (05:36 UTC) Moonrise 10:02PMMoonset 8:46AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1038 Pm Edt Mon Jul 26 2021
Rest of tonight..SW winds around 5 kt. |* insufficient grids for waveheight during (jul 27 21 02:00:00 gmt, jul 27 21 10:00:00 gmt)*|. Numerous showers and tstms late this evening.
Tue..W winds around 5 kt. |* insufficient grids for waveheight during (jul 27 21 10:00:00 gmt, jul 27 21 22:00:00 gmt)*|.
Tue night..SW winds around 5 kt. |* insufficient grids for waveheight during (jul 27 21 22:00:00 gmt, jul 28 21 10:00:00 gmt)*|.
Wed..NW winds around 5 kt. |* insufficient grids for waveheight during (jul 28 21 10:00:00 gmt, jul 28 21 22:00:00 gmt)*|.
Wed night..SE winds around 5 kt. |* insufficient grids for waveheight during (jul 28 21 22:00:00 gmt, jul 29 21 10:00:00 gmt)*|.
Thu..SW winds around 5 kt. |* insufficient grids for waveheight during (jul 29 21 10:00:00 gmt, jul 29 21 22:00:00 gmt)*|. A chance of showers.
Thu night..W winds 5 kt. |* insufficient grids for waveheight during (jul 29 21 22:00:00 gmt, jul 30 21 10:00:00 gmt)*|. A chance of showers.
Fri..N winds 5 to 10 kt. |* insufficient grids for waveheight during (jul 30 21 10:00:00 gmt, jul 31 21 10:00:00 gmt)*|. A chance of showers in the morning.
Sat..NW winds 5 to 10 kt...becoming s. |* insufficient grids for waveheight during (jul 31 21 10:00:00 gmt, aug 01 21 10:00:00 gmt)*|. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1038 Pm Edt Mon Jul 26 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will stall out over the carolinas through Tuesday night as weak high pressure builds back into the region. A weak front will drop across the waters Wednesday before a more potent cold front sweeps through the area Thursday into Friday. Small craft advisories may be required for portions of the waters Thursday through Friday.


7 Day Forecast for Marine Location Near Kemps Mill, MD
   Hourly   EDIT   Help
location: 39.63, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 270134 AAA AFDLWX

Area Forecast Discussion . UPDATED National Weather Service Baltimore MD/Washington DC 934 PM EDT Mon Jul 26 2021

SYNOPSIS. A weak cold front will stall out over central Virginia into southern Maryland through Tuesday. Another weak cold front will approach from the north Wednesday while an upper-level disturbance passes through. A stronger cold front will pass through late Thursday into early Friday and high pressure will build overhead for Saturday before moving offshore Sunday.

NEAR TERM /THROUGH TUESDAY/.

Two colliding outflow boundaries earlier this evening over central Maryland and northern Virginia resulted in a new line of thunderstorms that caused havoc in around the National Capital Region. These storms continue to move south and should exit the Fredericksburg area by 11 PM if not sooner. Radar trends indicate these storms are finally weakening. Once these storms exit the area in another hour or so, dry and tranquil conditions are epxected overnight. Some patchy fog is possible in areas that got the heaviest rains.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. High pressure will briefly build into our region on Tuesday with light winds continuing out of the north. An upper trough north of the Great Lakes is expected to drop south into PA. Shortwave energy along the southern parts of the trough may produce some isolated showers on Tuesday. I believe the threat remains relatively for showers on Tuesday especially with a continued northwesterly flow aloft advecting in drier air into the region. The combination of mostly clear skies along with a light flow will allow temps to rise up into the low to mid 90s on Tuesday. Typically as we get temps up into the mid 90s, the heat indices will become an issue but the lack of moisture advection will limit heat indexes to the 90s.

An upper level ridge will build over the central US Tuesday through Wednesday with a trough axis over the NE US. The positioning of the upper ridge will place our region in favorable location to allow for shortwaves to move over the ridge and drop down into our region. These shortwaves combined with a front approaching from the north may allow for showers and thunderstorms to form over the northern half of our CWA especially considering that temps will be hovering in the 90s. The main limiting factor for storm development will be the lack of good moisture in place on Wednesday. Afternoon temps be warm once again in the low to mid 90s. A marginal risk for SVR weather has been issued by SPC for areas along the MD/PA border for Wednesday due to the combination of shortwaves and a front slowly approaching from the north.

LONG TERM /THURSDAY THROUGH MONDAY/. An upper-level trough will strengthen over New England Thursday and Friday while the trough axis extends down through the Mid-Atlantic. A potent upper-level disturbance and jetmax associated with the trough will dig into New England during this time, and this will allow for a stronger cold front to approach Thursday before passing through Thursday night into Friday.

There will be some return flow ahead of the frontal passage which will allow for instability to develop. At the same time, moderate shear profiles are expected due to stronger northwest winds aloft associated with the upper-level trough and lower heights. Steep low- level lapse rates, increasing instability, stronger shear and forcing from the cold front suggests that thunderstorms are possible, and some storms may be severe. The best chance for severe appears to be Thursday afternoon and evening, but timing could shift depending on exactly when the cold front passes through.

The cold front will continue to push to the south for Friday into Friday night. However, the boundary could get hung up across our extreme southern zones for a period Friday, so a shower or thunderstorm is possible across those areas, but for most areas it will turn out less humid and dry.

High pressure will build overhead Friday night and Saturday, bringing dry and cooler conditions along with lower humidity. The high will move offshore for Sunday and warmer air will return.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. Dry conditions are expected through Tue. A slight risk of thunderstorms Wednesday.

A cold front will pass through late Thursday into early Friday. A few thunderstorms are possible ahead of the boundary, especially Thursday afternoon and evening. Some storms may become severe, with damaging winds being the primary threat.

The boundary will push to the south for Friday, but it may get hung up close to KCHO. An isolated storm near KCHO is possible, but other areas should be dry with northwest winds.

MARINE.

A cold front will approach the waters Thursday before passing through Thursday night into Friday. Winds may approach SCA criteria ahead of the front late Thursday into Thursday night (from southerly winds), and again behind the front late Thursday night and Friday (from northwest winds).

A few thunderstorms are possible Thursday afternoon and evening, and some may produce gusty winds. An isolated t-storm near the extreme southern portion of the waters around Tangier Island cannot be completely ruled out Friday afternoon, but most places will be dry.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

SYNOPSIS . LFR NEAR TERM . LFR SHORT TERM . JMG LONG TERM . BJL AVIATION . LFR MARINE . LFR


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 66 mi127 min WNW 2.9 G 4.1 75°F 83°F1014.9 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi127 min NW 1 G 1.9 81°F 83°F1013.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 73 mi127 min WNW 5.1 G 6 79°F 1014.2 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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
12
AM
1
AM
Last
24hr
SW3
G6
SW3
SW2
SW3
--
S1
S3
W3
G6
W4
W5
W3
G6
W4
W4
W5
G11
SW4
G7
E5
G9
SE6
G13
SE5
G10
NW2
G6
E2
--
NW3
G6
--
--
1 day
ago
S11
G15
S9
S10
G15
S11
G14
S6
G9
S6
G9
SW5
G9
S7
S9
G12
S8
S9
S9
S6
S9
G12
S10
S9
G12
S9
S9
S7
S6
G9
S6
S5
SW5
G10
SW4
2 days
ago
E1
--
SE2
S3
S4
S6
S6
S8
G12
S7
S9
S7
G10
S7
G11
SE8
G15
SE8
G13
SE6
SE4
G8
SE5
G8
SE8
G12
S9
S7
G10
S9
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD6 mi44 minN 09.00 miA Few Clouds76°F70°F82%1016.1 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi44 minN 010.00 miFair71°F68°F90%1014.7 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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
12
AM
1
AM
Last 24hrCalmCalmCalmS3CalmSE5CalmCalmW5NW544W5E7NE7NE5NE5E4SE3SE4CalmS7SW4Calm
1 day agoS10S8S6S7S5S7S7S9SW5SW10W10W55W85S6SW8SW7W4CalmCalmCalmCalmCalm
2 days agoE3E4E5NE4E4CalmCalmSE4S7S7SE8S10S11S11S115S8SE8SE9SE9S12S10S9S9

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 -- 06:05 AM EDT     Sunrise
Tue -- 06:11 AM EDT     0.20 feet Low Tide
Tue -- 09:44 AM EDT     Moonset
Tue -- 11:50 AM EDT     3.39 feet High Tide
Tue -- 06:43 PM EDT     0.10 feet Low Tide
Tue -- 08:24 PM EDT     Sunset
Tue -- 10:58 PM EDT     Moonrise
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
3.22.82.21.50.90.50.20.4122.83.33.43.12.51.81.20.70.20.10.51.42.22.9

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 -- 06:05 AM EDT     Sunrise
Tue -- 06:06 AM EDT     0.20 feet Low Tide
Tue -- 09:44 AM EDT     Moonset
Tue -- 11:45 AM EDT     3.39 feet High Tide
Tue -- 06:38 PM EDT     0.10 feet Low Tide
Tue -- 08:24 PM EDT     Sunset
Tue -- 10:58 PM EDT     Moonrise
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
3.22.72.11.50.90.50.20.41.122.83.33.43.12.51.81.20.60.20.10.61.42.32.9

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.