Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Upper Marlboro, MD

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:24AMSunset 7:57PM Tuesday August 20, 2019 11:13 PM EDT (03:13 UTC) Moonrise 9:46PMMoonset 9:58AM Illumination 70% Phase: Waning Gibbous; Moon at 20 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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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 1035 Pm Edt Tue Aug 20 2019
.small craft advisory in effect from 9 am edt Wednesday through Wednesday evening...
Rest of tonight..S winds 5 kt. Waves less than 1 ft. A slight chance of tstms with isolated showers.
Wed..S winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft. Scattered showers and tstms.
Wed night..SW winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft... Subsiding to 1 ft after midnight. Scattered showers and tstms.
Thu..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Thu night..SW winds 5 kt...becoming nw after midnight. Waves 1 ft. A chance of showers.
Fri..N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Fri night..N winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
Sun..E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1035 Pm Edt Tue Aug 20 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure in the atlantic will promote a light southerly flow over the region into Wednesday. A cold front will approach the waters late Wednesday night into Thursday and stall near or south of the area into Friday. High pressure will then settle over the area Saturday into Sunday.


7 Day Forecast for Marine Location Near Upper Marlboro, MD
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location: 38.8, -76.72     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 210142
afdlwx
area forecast discussion
national weather service baltimore md washington dc
942 pm edt Tue aug 20 2019

Synopsis
An upper level disturbance will cross the region this afternoon
and evening. A cold front will approach the ohio valley
Wednesday, sinking into our area Wednesday night into Thursday,
possibly stalling into Friday. Behind the front, high pressure
will build over the region for the weekend.

Near term through tonight
Shower and thunderstorm activity has diminished in the last
hours and some activity is still left over southern md into the
fredericksburg area. Isolated showers are also moving in from
the west and this may continue overnight, but not expecting much
from these. Some patchy fog is also possible. Lows will range
from the upper 60s to mid 70s.

Short term Wednesday through Thursday night upper
vort trough will be on the doorstep by Wednesday morning and
will cross the region during the day Wednesday. A surface trough
is also expected to cross the region during this time.

Instability will be a bit lower due to increased cloud cover and
slightly lower temperatures, but additional scattered showers
and thunderstorms are expected, with a few isolated
thunderstorms possible. Highs will range from the upper 80s to
lower 90s. Activity will wane again Wednesday night. Lows in the
70s.

The front will shift southward into the region on Thursday,
likely crossing much of the area through Thursday night, with
continued chances for showers and thunderstorms. Highs will
range from the upper 80s to lower 90s. Lows in the 60s to around
70f.

Long term Friday through Tuesday
The cold front will stall near, or just south of the area on Friday,
resulting in yet another chance for scattered showers and
thunderstorms throughout the day. One big change will be in the
temperatures in humidity, as highs on Friday look to only be in the
upper 70s to low 80s, with some guidance even a little cooler up
north. Humidity will also drop significantly, with dew points
dropping into the low 60s. Overnight lows will be noticeably cooler,
ranging from the mid 50s over the higher elevations to the low mid
60s east of the blue ridge. Rain chances will increase the farther
south you go, so areas in the central va piedmont and southern md
stand the best chance.

By Saturday, there still remains some discrepancies between the
global guidance, with the GFS clearing the front from the area
Friday night, resulting in dry weather on Saturday. The ecmwf
however, clears the front Saturday morning or early afternoon,
resulting in showers early in the day (primarily in the central va
piedmont and perhaps southern md). Regardless, thinking that things
clear out by noon everywhere on Saturday. Areas farther north likely
stay dry all day. Another day with highs in the upper 70s to low
80s, accompanies by low humidity, thanks to cool canadian high
pressure building in from the north. Overnight lows again will range
from the mid 50s over the higher elevations to the low mid 60s east
of the blue ridge.

High pressure dominates on Sunday, with temperatures remaining
consistent in the upper 70s to low 80s. Will carry slight chance for
some showers across central va, but thinking the front should be far
enough south by then to be out of our hair.

By Monday, some indications of a return flow are shown among the
guidance, meaning that the front would begin to lift back north as a
warm front potentially. Very low confidence at this point, as the
ecmwf keeps the front to the south, while the GFS wants to bring it
back north across the region. For now, will keep chance slight
chance pops in the forecast.

Aviation 02z Wednesday through Sunday
A few isolated showers are still possible overnight, but
overall dry. Patchy fog may result in MVFR ifr visibilities
overnight. Additional showers and storms can be expected both
Wednesday and Thursday afternoon evening as a frontal boundary
moves into the region. Again, brief episodes of subVFR
conditions will be possible in passing showers storms.

Vfr conditions are expected for much of the long term period at
every terminal except for cho. Showers and a few thunderstorms are
expected on Friday, which will lead to periods of sub-vfr
conditions. This could continue into Saturday as well.

Marine
A few showers and storms are still lingering over the waters at
this time, some areas with special marine warnings, but
activity should diminish in the next hours. A light southerly
flow is expected tonight, and will begin to increase Wednesday
as a cold front nears to the west. This will likely bring gusts
to SCA threshold Wednesday and Wednesday evening, so SCA has
been issued. The aforementioned front will slowly makes it way
south across the waters late Wednesday night and during the day
on Thursday, with continued chances for gusty showers storms.

Sub-sca winds expected through the weekend. However, scattered
showers and thunderstorms on Friday could lead to some brief gusty
winds. Best chance for this activity will be in the central bay and
lower tidal potomac.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 1 pm to 7 pm edt Wednesday for
anz530-531-535-536-538-539-542.

Small craft advisory from 9 am Wednesday to midnight edt
Wednesday night for anz532>534-537-540-541-543.

Synopsis... Mm
near term... Mm imr
short term... Mm
long term... Cjl
aviation... Mm imr cjl
marine... Mm imr cjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BSLM2 - Chesapeake Bay, MD 1 mi163 min E 1.9 76°F 1018 hPa73°F
TPLM2 - Thomas Point, MD 17 mi73 min SW 4.1 G 5.1 78°F 83°F1017.6 hPa (+0.4)71°F
WASD2 - 8594900 - Washington, DC 17 mi79 min SSE 2.9 G 5.1 76°F 84°F1016.7 hPa
APAM2 - 8575512 - Annapolis, MD 18 mi73 min 78°F 1015.8 hPa (+0.0)
CPVM2 22 mi73 min 79°F 73°F
44062 - Gooses Reef, MD 23 mi79 min ESE 3.9 G 5.8 76°F 1017.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 31 mi73 min S 4.1 G 5.1 78°F 1016.5 hPa (+0.0)
FSNM2 31 mi79 min SSW 1.9 G 6 78°F 1016.2 hPa
BLTM2 - 8574680 - Baltimore, MD 33 mi79 min WSW 1.9 G 4.1 79°F 84°F1016.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 33 mi73 min ESE 7 G 9.9 76°F 1017 hPa (+0.3)
SLIM2 - 8577330 - Solomons Island, MD 36 mi73 min SE 2.9 G 4.1 76°F 84°F1016.4 hPa (+0.6)
NCDV2 37 mi79 min SW 8.9 G 9.9 73°F 89°F1016.4 hPa
CA2 - 8571892 - Cambridge, MD 38 mi79 min WNW 5.1 G 7 79°F 85°F1016.9 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 38 mi79 min SW 8.9 G 11 80°F 85°F1017 hPa
PPTM2 - 8578240 - Piney Point, MD 47 mi73 min WSW 16 G 22

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Camp Springs / Andrews Air Force Base, MD8 mi17 minSSW 810.00 miMostly Cloudy72°F67°F85%1017.7 hPa
College Park Airport, MD16 mi30 minN 07.00 miPartly Cloudy0°F0°F%1016.6 hPa
Washington/Reagan National Airport, DC, VA17 mi21 minS 710.00 miMostly Cloudy75°F69°F82%1016.8 hPa
Annapolis, United States Naval Academy, MD18 mi19 minS 310.00 miFair79°F69°F72%1016.8 hPa
Fort Meade / Tipton, MD20 mi31 minN 010.00 miFair70°F68°F94%1017.3 hPa
Bay Bridge Field, MD24 mi73 minNE 310.00 miFair79°F69°F74%1016.6 hPa

Link to 5 minute data for KADW

Wind History from ADW (wind in knots)
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Last 24hrNW4CalmW3--W3CalmN4N4N3NE7E7E6NE7E4E8E4E6SE17
G35
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1 day agoS3S6CalmCalmCalmS4S3S4SW5W4W5W5CalmCalmSW4SW5W4SW10E3CalmCalmSE3CalmCalm
2 days agoCalmS5S6CalmS4CalmCalmS4S3CalmCalmCalmCalmE4S10CalmSE6SE5SE6--CalmCalmCalmNE7

Tide / Current Tables for Hills Bridge (Route 4), Maryland
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Hills Bridge (Route 4)
Click for Map
Tue -- 03:54 AM EDT     1.61 feet Low Tide
Tue -- 06:24 AM EDT     Sunrise
Tue -- 09:12 AM EDT     3.46 feet High Tide
Tue -- 10:58 AM EDT     Moonset
Tue -- 04:11 PM EDT     0.95 feet Low Tide
Tue -- 07:54 PM EDT     Sunset
Tue -- 10:01 PM EDT     3.53 feet High Tide
Tue -- 10:45 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.72.31.91.71.61.82.22.73.23.53.432.521.51.111.11.52.12.83.33.53.4

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Tue -- 12:28 AM EDT     -0.00 knots Slack
Tue -- 03:21 AM EDT     -0.62 knots Max Ebb
Tue -- 06:20 AM EDT     0.00 knots Slack
Tue -- 06:23 AM EDT     Sunrise
Tue -- 09:17 AM EDT     0.61 knots Max Flood
Tue -- 10:57 AM EDT     Moonset
Tue -- 12:11 PM EDT     -0.00 knots Slack
Tue -- 03:27 PM EDT     -0.75 knots Max Ebb
Tue -- 06:37 PM EDT     0.00 knots Slack
Tue -- 07:53 PM EDT     Sunset
Tue -- 09:53 PM EDT     0.79 knots Max Flood
Tue -- 10:43 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.2-0.5-0.6-0.6-0.4-0.10.20.50.60.60.40.1-0.3-0.6-0.7-0.7-0.5-0.20.10.50.70.80.7

Weather Map and Satellite Images
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wmap_A
GOES 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 (23,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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 numerious 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.