Thursday, August13, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
Broadlands, VA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:20AMSunset 8:08PM Thursday August 13, 2020 9:41 PM EDT (01:41 UTC) Moonrise 12:00AMMoonset 2:50PM Illumination 24% Phase: Waning Crescent; Moon at 25 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- 738 Pm Edt Thu Aug 13 2020
Tonight..NE winds 5 kt. Waves less than 1 ft. A chance of showers. A chance of tstms, mainly this evening.
Fri..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Fri night..NE winds 5 kt. Waves less than 1 ft. A chance of showers.
Sat..E winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Sat night..E winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Sun..E winds 5 kt. Waves less than 1 ft. Showers likely with a chance of tstms.
Sun night..NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Mon..NW winds around 5 kt. Waves 1 ft.
Tue..NW winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 738 Pm Edt Thu Aug 13 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A stationary front will remain near the mid atlantic through Saturday before gradually moving to the south late in the weekend. A cold front will approach early next week.


7 Day Forecast for Marine Location Near Broadlands, VA
   Hourly   EDIT   Help
location: 39.02, -77.52     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 140055 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 855 PM EDT Thu Aug 13 2020

SYNOPSIS. A stalled front will plague the area with multiple rounds of showers and thunderstorms through the weekend. High pressure will nose into the region briefly early next week before an unsettled pattern likely returns by the middle of next week

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/.

Skies had cleared this afternoon and allowed for some scattered showers and thunderstorms to form. These storms are starting to weakened this evening and I expect them to taper off over the next couple of hours. Clouds should slowly overspread our region as the environment remains relatively saturated. Light winds coupled moist conditions could lead to some patchy fog Friday morning.


..Previous discussion

Conditions have quieted down across the area after rain and thunderstorms this morning that led to multiple instances of flooding across the area. The remnant mid-level cloud deck from this earlier convection has kept skies mostly cloudy along the I-95 corridor, and this lack of daytime heating will limit the potential for widespread redevelopment of showers and storms. Locations to the west of the Blue Ridge have seen more sunshine this afternoon, and as a result will stand the greatest chance for the development of showers and storms. Even there, coverage is only expected to be scattered in nature. Our southern Chesapeake Bay zones as well as St. Mary's county have also destabilized, and are currently seeing storms develop. A Flash Flood Watch remains in effect until midnight for the entire area. The need for this watch will need to be examined through the remainder of the afternoon. Consideration was given to canceling it across portions of the area, given the low expected coverage of storms. However, we ultimately decided to hang onto it for now, since many locations are so flood prone in the wake of rain both yesterday and earlier today. If anything else at all fires up in the metro areas, it will pose a threat for flooding.

Showers and storms are expected to weaken and eventually dissipate overnight. There are some signs that showers or storms may form late tonight to the north of an area of low pressure situated off to our south and move across Southern Maryland around daybreak. Elsewhere, mostly cloudy skies are expected through most of the night. Some fog may try to form across southwestern portions of the area toward daybreak, but think that the cloud cover should limit that somewhat.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/. Front will make some southward progress Friday night through Saturday night as upper trough to the west strengthens. This will result in better afternoon storm coverage Friday, and then better rain/storm coverage overall Saturday. Saturday could be an active day, as synoptic scale forcing for ascent in advance of the trough overspreads the area. Widespread rain, with embedded heavier elements are expected. Given the amount of rainfall that has fallen recently, this will lead to flooding concerns. Rainfall could locally be enhanced both along the Blue Ridge and across the Potomac Highlands with low-level southeasterly flow running up against the higher terrain. Rainfall amounts could also be locally be enhanced from central Virginia to southern Maryland, where they'll stand the best chance of destabilizing and developing some convective elements. With the continued clouds and storms, highs will continue to be in the 80s, with Saturday being the cooler day as the front drops further south. Lows will be in the 60s to 70s, not much change.

LONG TERM /SUNDAY THROUGH THURSDAY/. An unsettled pattern will likely linger into the second half of the weekend as a wave of low pressure traverses a stalled front. Additional heavy rainfall and flooding is possible.

Conditions should dry out early next week as high pressure briefly builds into the region. The mid/upper flow buckles a bit toward the middle of next week, resulting in a renewed chance of showers and thunderstorms as unsettled weather returns.

AVIATION /01Z FRIDAY THROUGH TUESDAY/.

Clouds are starting to build back over the region this evening after brief clearing this past afternoon. MVFR conditions are expected to overspread all terminals overnight with IFR conditions possible at all terminals. I put in IFR for the MTN, CHO and MRB terminals for now but I can't rule out IFR for the big three. The threat for showers and thunderstorms should continue to wane through the overnight periods for all terminals.

.Previous Discussion.

Patchy low clouds and fog will be an issue each of the next three late night/early morning periods as plentiful low level moisture will make its formation easy, if we have clearing. That said, higher clouds may limit this threat at the terminals. For now have introduced low-end MVFR ceilings at most of the terminals tonight (with IFR at CHO). Although some of the guidance does have conditions dropping to IFR, didn't yet have the confidence to include it in the TAFs at most of the terminals. Otherwise, main concern will be for heavy downpours with lightning to produce sub-VFR conditions and gusty winds.

Sub-VFR conditions are possible in low clouds/rain on Sunday.

MARINE. Generally sub-SCA conditions expected on the waters through Saturday. Main concern each day will be thunderstorms, primarily during the afternoon hours, though some may develop during the mornings. Gusty winds and even a few waterspouts will be possible with stronger storms.

Onshore flow is expected to persist Sunday, and may be near Small Craft Advisory (SCA) levels.

HYDROLOGY.

TIDES/COASTAL FLOODING. Persistent onshore flow and increasing astronomical tides (approaching new moon) will likely result in tidal flooding, some of which may be close to moderate as evidenced by the last several runs of the SFAS ensemble.

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

SYNOPSIS . DHOF NEAR TERM . KJP SHORT TERM . RCM/KJP LONG TERM . DHOF AVIATION . RCM/DHOF/KJP MARINE . RCM/DHOF/KJP 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 28 mi53 min 80°F 85°F
BSLM2 - Chesapeake Bay, MD 46 mi131 min ENE 1 1016 hPa
BLTM2 - 8574680 - Baltimore, MD 53 mi53 min 79°F 85°F

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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
7
PM
8
PM
9
PM
Last
24hr
E2
NE2
SE3
--
E1
SE1
G5
E1
G4
NE1
E2
N3
NE3
E1
G6
SE4
G8
E1
G4
N4
--
N1
G6
NE2
G5
E4
SE5
G8
SE3
G9
E2
G6
SE2
G5
NE1
G7
1 day
ago
S6
S6
SE4
S5
S6
SW5
SW4
W3
G6
W4
G8
NW4
--
NE3
SW4
S5
SW2
W3
S5
S4
SW5
G8
SE3
G6
NE3
G13
NE4
G11
N2
W1
2 days
ago
S7
SW3
S5
S3
S3
S5
S4
S3
G7
S5
SE3
S6
S5
S3
S7
S5
G11
S7
G10
S9
S8
G11
S11
S7
G11
S10
S8
S5
G8
S4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Leesburg / Godfrey, VA5 mi46 minENE 310.00 miPartly Cloudy73°F69°F89%1017.6 hPa
Washington/Dulles International Airport, DC, VA6 mi49 minENE 510.00 miMostly Cloudy78°F71°F79%1016.8 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA21 mi45 minN 010.00 miA Few Clouds75°F72°F90%1017.3 hPa
Gaithersburg - Montgomery County Airport, MD21 mi45 minN 010.00 miFair73°F71°F94%1018.8 hPa

Link to 5 minute data for KJYO

Wind History from JYO (wind in knots)
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
7
PM
8
PM
9
PM
10
PM
Last 24hrCalmCalmN3CalmN3CalmN3CalmN3NE4CalmNE3CalmNE4E3NE5E5NE5E7E4E7NE8E3NE5
1 day agoSW3SW3SW4CalmSW4CalmS9SW9S9W4N4CalmN4NE5CalmCalmSW7SW5CalmW4SE12
G15
E13
G19
CalmW3
2 days agoCalmCalmSE4CalmCalmCalmCalmCalmCalmS3W3CalmSW3S7S5S5S7S7SW5SW4SW4SW3SW3SW3

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
Thu -- 12:57 AM EDT     Moonrise
Thu -- 04:10 AM EDT     3.11 feet High Tide
Thu -- 06:20 AM EDT     Sunrise
Thu -- 11:14 AM EDT     0.72 feet Low Tide
Thu -- 03:48 PM EDT     Moonset
Thu -- 04:58 PM EDT     2.65 feet High Tide
Thu -- 08:05 PM EDT     Sunset
Thu -- 10:42 PM EDT     0.57 feet Low 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
1.11.82.533.132.72.21.61.20.90.70.81.21.82.32.62.72.521.50.90.60.6

Tide / Current Tables for Chain Bridge, one mile below, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Thu -- 12:57 AM EDT     Moonrise
Thu -- 04:05 AM EDT     3.11 feet High Tide
Thu -- 06:20 AM EDT     Sunrise
Thu -- 11:09 AM EDT     0.72 feet Low Tide
Thu -- 03:48 PM EDT     Moonset
Thu -- 04:53 PM EDT     2.65 feet High Tide
Thu -- 08:05 PM EDT     Sunset
Thu -- 10:37 PM EDT     0.57 feet Low 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
1.21.92.633.132.62.11.61.10.90.70.81.21.82.32.62.72.521.40.90.60.6

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (21,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.