Thursday, July27, 2017 L-36.com


Marine Weather and Tides
Prince Frederick, MD

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:04AMSunset 8:23PM Thursday July 27, 2017 8:52 PM EDT (00:52 UTC) Moonrise 9:38AMMoonset 10:12PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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
ANZ533 Chesapeake Bay From North Beach To Drum Point- 732 Pm Edt Thu Jul 27 2017
Tonight..SW winds 10 to 15 kt. Waves 1 to 2 ft. Isolated tstms. Scattered showers.
Fri..S winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. Vsby 1 nm or less.
Fri night..S winds 5 to 10 kt...becoming nw after midnight. Waves 1 ft. Showers with a chance of tstms. Vsby 1 nm or less.
Sat..N winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. Showers.
Sat night..N winds 10 to 15 kt with gusts to 25 kt. Waves 3 ft. A chance of showers.
Sun..N winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. A chance of showers.
Sun night..NE winds 10 kt with gusts to 20 kt. Waves 2 ft. A chance of showers.
Mon..NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers.
Tue..SW winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 732 Pm Edt Thu Jul 27 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will approach the waters Friday before intensifying as it moves over the mid atlantic Friday night. The low is expected to stall out over the delmarva peninsula on Saturday into Sunday before moving out to sea Monday. A small craft advisory will likely be needed for the waters Friday night through Sunday. A gale warning may be needed for portions of the waters Saturday afternoon through Saturday night.

7 Day Forecast for Marine Location Near Prince Frederick, MD
   Hourly   EDIT   Help
location: 38.59, -76.49     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 271852
afdlwx
area forecast discussion
national weather service baltimore md washington dc
252 pm edt Thu jul 27 2017

Synopsis
An upper-level disturbance will pass through the area this
evening. Upper level low pressure system will intensify as it
moves into the area Friday. This will slowly pass through the
area Friday night into Saturday before stalling near the mid-
atlantic coast through Monday. High pressure is expected to
build overhead during the middle portion of next week.

Near term until 6 am Friday morning
Surface analysis shows high pressure off the southeast coast
with a cold front extending from quebec to illinois.

Isolated to scattered showers and thunderstorms are possible.

Shear profiles will strengthen a bit in response to the
shortwave energy moving through and this may cause a few
thunderstorms to become severe. However... Widespread severe
weather is not expected since the forcing will be weak and shear
profiles will be marginal. Locally damaging wind gusts are the
primary threat.

The shortwave energy and surface trough will move to the east
tonight while a stronger upper-level low digs through the great
lakes. Our area will remain in between these systems... So any
showers will likely remain isolated to scattered. Min temps will
range from the 60s in most areas west of the blue ridge
mountains to the lower and mid 70s near washington and
baltimore.

Short term 6 am Friday morning through Saturday night
Upper-level low will track from near lake winnepeg into the
ohio valley Friday, and into our area Friday night. This system
will interact with a cold front to our north, causing surface
low pressure to develop along the boundary. The upper-level low
and surface low will strengthen as it moves into our area Friday
night. Coastal low pressure is expected to develop near the
delmarva peninsula Friday night. This system is expected to
remain nearly stationary around this area through Saturday
night.

As the low approaches the area Friday... Showers will become more
widespread along with some thunderstorms. Deep moisture in place
suggests that showers and thunderstorms will be locally heavy.

The widespread showers and thunderstorms are expected to
continue through Friday night as the low pressure strengthens
overhead. A flash flood watch has been issued for the northern
2 3 of the forecast area. The heaviest rain is likely to be
just north of the surface low and near the 850mb warm
front... Where the most frontogenetical forcing is expected.

Latest guidance seems to paint this area across northern and
central maryland... Northern virginia... Eastern west virginia and
toward the washington and baltimore metropolitan areas.

Most likely rainfall amounts for Friday through Friday night
are around 1 to 3 inches... Again with the best chances of the
highest amounts being across the areas mentioned.

However... Locally higher amounts are possible due to the
convective nature of the precipitation.

The low is expected to stall near the DELMARVA peninsula
Saturday through Saturday night. A gusty north to northeast flow
is likely along with more rain. Unusually cool conditions are
expected due to the cloud cover and rain. The trend over the
past couple days has been slower and farther south west with
this system for Saturday through Saturday night.

Long term Sunday through Wednesday
The cut-off low will likely be moving off the east coast Sunday
while coastal low pressure will be near delmarva. Showers will
be tapering off from west to east across the mid- atlantic
region and northerly flow will keep temperatures on the cool
side for late july. The cut-off low oscillates along the mid-
atlantic coastline through Monday resulting in cool and cloudy
conditions across portions of the mid-atlantic region. This
system finally moves out to sea Tuesday and high pressure moves
into the region.

Temperatures will slowly climb back to near normal by next wed-thu.

Aviation 19z Thursday through Tuesday
Although plenty of clouds around celings areVFR. Isolated to
scattered thunderstorms are expected this afternoon and evening.

A couple storms may be severe... With damaging winds the primary
threat.

Low pressure will approach the terminals Friday before moving
overhead and intensifying Friday night. Widespread showers and
thunderstorms are expected to develop and rain may be locally
heavy. A few storms may also be severe. More rain is likely
Saturday and Saturday night along with subvfr CIGS and vsbys as
the low stalls out near the DELMARVA peninsula. Gusty north to
northeast winds are also possible during this time.

Rainfall may linger Sunday (and perhaps into Monday) as low
pressure meanders near the area. Improving conditions expected
once low moves further out to sea by the middle of the week.

Marine
High pressure will remain offshore through tonight and an
onshore flow is expected. Marginal SCA is effect.

Low pressure will approach the waters Friday before
strengthening overhead Friday night. The low will likely stall
out near the DELMARVA peninsula Saturday through Saturday night.

Gusty winds are possible with the low nearby... Especially Friday
night through Saturday night.

Northerly winds continue on the waters Sunday-Monday. Sca
may be needed.

Hydrology
A flash flood watch has been issued for Friday afternoon through
Saturday afternoon for the northern 2 3 of the forecast area.

Most likely rainfall amounts during this time will be around 3
to 5 inches. This may cause minor flooding... Particularly across
the potomac river basin.

Tides coastal flooding
Persistent southerly flow has allowed tidal anomalies to
increase to over a foot. Coastal flood advisories this evening
at straits point.

Low pressure is expected to impact the area Friday into the
weekend, bringing the potential for elevated tidal anamolies
with a risk of coastal flooding.

Lwx watches warnings advisories
Dc... Flash flood watch from Friday afternoon through Saturday
afternoon for dcz001.

Md... Flash flood watch from Friday afternoon through Saturday
afternoon for mdz003>006-011-013-014-016>018-501>508.

Coastal flood advisory until 9 pm edt this evening for mdz017.

Va... Flash flood watch from Friday afternoon through Saturday
afternoon for vaz027>031-040-051>055-057-501-502-505>507.

Wv... Flash flood watch from Friday afternoon through Saturday
afternoon for wvz050>053-055-501>504.

Marine... Small craft advisory until 2 am edt Friday for anz532>534-537-
540-541-543.

Products... Woody! Hsk


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
44062 - Gooses Reef, MD 5 mi42 min SSW 12 G 14 83°F 1012.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 14 mi52 min S 9.9 G 12 82°F 1012.1 hPa (-0.5)
BSLM2 - Chesapeake Bay, MD 18 mi142 min SE 2.9 82°F 1011 hPa74°F
SLIM2 - 8577330 - Solomons Island, MD 19 mi52 min S 5.1 G 6 82°F 83°F
TPLM2 - Thomas Point, MD 22 mi52 min S 8.9 G 8.9 82°F 81°F
CA2 - 8571892 - Cambridge, MD 22 mi52 min 81°F 84°F1012.7 hPa (-0.4)
44063 - Annapolis 26 mi42 min SSE 9.7 G 12 82°F 1011.4 hPa
APAM2 - 8575512 - Annapolis, MD 27 mi52 min 82°F 1011 hPa (-0.4)
CPVM2 29 mi52 min 81°F 77°F
PPTM2 - 8578240 - Piney Point, MD 32 mi52 min S 6 G 6
44061 - Upper Potomac, MD 32 mi64 min WNW 5.8 G 5.8 80°F 1011.5 hPa
WASD2 - 8594900 - Washington, DC 34 mi52 min S 7 G 8 83°F 85°F1010.6 hPa (-0.5)
NCDV2 34 mi52 min SW 4.1 G 4.1 82°F 84°F1010.2 hPa (-0.7)
BISM2 - 8571421 - Bishops Head, MD 35 mi52 min SE 12 G 14 81°F 81°F1011.8 hPa (-0.6)
44043 - Patapsco, MD 39 mi42 min S 12 G 14 81°F 1012 hPa
LWTV2 - 8635750 - Lewisetta, VA 41 mi52 min S 2.9 G 2.9 82°F 83°F1011.3 hPa (-0.6)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 44 mi52 min S 8 G 9.9 81°F 1011.1 hPa (-0.3)
TCBM2 - 8573364 - Tolchester Beach, MD 45 mi52 min SE 4.1 G 5.1 80°F 82°F1011.8 hPa (-0.4)
BLTM2 - 8574680 - Baltimore, MD 47 mi52 min SW 4.1 G 7 81°F 83°F1010.9 hPa (-0.3)

Wind History for Cove Point LNG Pier, MD
(wind in knots)    EDIT      (on/off)   Help
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
7
PM
8
PM
Last
24hr
S19
G23
SE16
G22
S18
S17
S16
G20
SW12
G16
SW13
S15
S16
S9
G12
SW10
S10
SW13
G16
SW12
G15
SW8
S10
S11
S9
S8
G11
SW8
SW7
S4
S12
S10
1 day
ago
N9
NE6
G9
E9
G12
E10
G13
SE7
G10
SE7
SE6
G9
SE8
G11
SE10
SE7
SE6
G9
E7
E7
SE5
SE3
SE3
S6
S7
G11
S7
S8
S7
S8
SE13
G18
S16
2 days
ago
S15
S13
G16
SW16
NW11
G14
N19
N22
G27
NE19
G23
N14
G22
N15
G21
N19
N20
N22
G27
N19
G23
N17
N12
G15
N7
G15
N9
N6
G9
N5
G9
N10
G13
N9
G12
N8
G12
N9
G13
NE9
G12

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Marys County Airport, MD19 mi55 minN 010.00 miPartly Cloudy79°F71°F79%1012.2 hPa
Patuxent River, Naval Air Station, MD21 mi60 minSSE 410.00 miMostly Cloudy80°F75°F85%1011.5 hPa

Wind History from 2W6 (wind in knots)
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 24hrSE5SE5CalmS3S3S3S4S4S3CalmS3SW3SW8S6
G9
SW7S7S4S5CalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3E6CalmE4SE3SE3SE7SE5SE5E3SE5
2 days agoSE3CalmS3W3NW3N4NW3NW3CalmN3W3NW5NW5NW10
G14
W5NW6N5NE3W5NW3NW5CalmCalmCalm

Tide / Current Tables for Plum Point, Maryland
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Plum Point
Click for Map
Thu -- 12:49 AM EDT     0.40 feet Low Tide
Thu -- 06:03 AM EDT     Sunrise
Thu -- 06:52 AM EDT     1.46 feet High Tide
Thu -- 10:38 AM EDT     Moonrise
Thu -- 01:42 PM EDT     0.31 feet Low Tide
Thu -- 07:32 PM EDT     1.32 feet High Tide
Thu -- 08:21 PM EDT     Sunset
Thu -- 11:12 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.50.70.91.21.41.51.41.20.90.70.50.30.30.40.60.91.21.31.31.210.8

Tide / Current Tables for Broomes Island, 0.4 mile south of, Maryland Current
   EDIT      (on/off)   Help   One Week of Data
Broomes Island
Click for MapFlood direction 290 true
Ebb direction 110 true

Thu -- 12:31 AM EDT     0.00 knots Slack
Thu -- 03:28 AM EDT     0.46 knots Max Flood
Thu -- 06:04 AM EDT     Sunrise
Thu -- 06:47 AM EDT     -0.00 knots Slack
Thu -- 10:06 AM EDT     -0.62 knots Max Ebb
Thu -- 10:38 AM EDT     Moonrise
Thu -- 01:26 PM EDT     0.00 knots Slack
Thu -- 04:16 PM EDT     0.45 knots Max Flood
Thu -- 07:45 PM EDT     -0.00 knots Slack
Thu -- 08:20 PM EDT     Sunset
Thu -- 10:37 PM EDT     -0.43 knots Max Ebb
Thu -- 11:12 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.10.10.30.40.40.30.2-0.1-0.3-0.5-0.6-0.6-0.4-0.10.10.30.40.40.30.1-0.1-0.3-0.4-0.4

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (20,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Dover AFB, DE
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.