Monday, May22, 2017 L-36.com


Marine Weather and Tides
Glasgow, DE

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:40AMSunset 8:18PM Monday May 22, 2017 1:36 PM EDT (17:36 UTC) Moonrise 2:49AMMoonset 3:35PM Illumination 9% Phase: Waning Crescent; Moon at 27 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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ANZ530 Chesapeake Bay North Of Pooles Island- 1032 Am Edt Mon May 22 2017
Rest of today..S winds 5 kt. Waves less than 1 ft. Showers late this morning, then showers with a slight chance of tstms this afternoon.
Tonight..NW winds 5 kt. Waves flat. A chance of showers. Patchy fog. Vsby 1 to 3 nm.
Tue..NE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Tue night..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..SE winds around 5 kt. Waves flat.
Wed night..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Thu..W winds 5 to 10 kt. Waves 1 ft. Showers likely .
Fri..NW winds 10 to 15 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Am Edt Mon May 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the area by this evening. High pressure may briefly build in tonight into early Tuesday before a low pressure system moves up near the delmarva coast Tuesday night. Small craft advisories may need to be extended into Tuesday night.

7 Day Forecast for Marine Location Near Glasgow, DE
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location: 39.55, -75.73     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 221607
afdphi
area forecast discussion
national weather service mount holly nj
1207 pm edt Mon may 22 2017

Synopsis
Weak low pressure is developing on a warm front from the
delmarva peninsula into southern new jersey today. A cold front
approaching from the west will merge with the warm front just
off the mid atlantic coast tonight. Low pressure in north
carolina Tuesday will pass east of the mid atlantic coast
Tuesday night. Weak high pressure is left behind over our area
Wednesday. Stronger low pressure organizes in the ohio valley
Wednesday night sending its associated fronts through the mid
atlantic states late Thursday or early Friday as the low moves
into new england. High pressure should follow for the weekend.

Near term /until 6 pm this evening/
High pressure offshore of CAPE cod will slowly drift eastward
through today, which will keep a steady onshore flow through the
afternoon. A warm front to our south will slowly drift
northward through the day as a cold front approaches from the
west. Meanwhile, southwest flow aloft will continue to keep
moisture over running the warm front. Periods of showers will
continue to move across the area through the day as a couple of
short wave/vorticity impulses traverse the area. Instability
still remains forecast as little to none, but we will maintain
the isolated chance of thunderstorms as there is some very weak
instability aloft, and it is possible for a few isolated
lightning strikes.

The main threat today will continue to be the possibility for
periods of moderate to heavy rainfall across the area. Pw values
are forecast around 1.5-1.75 inches across the southwestern
two-thirds of the area, especially DELMARVA and southern new
jersey. So there is the potential for localized flooding,
especially in poor drainage areas and especially if any
thunderstorms develop. It still looks like there will be a sharp
drop off in rain totals north and west of i95.

Expect rain to taper off rather quickly late this afternoon as
the cold front approaches the region.

Short term /6 pm this evening through 6 am Tuesday/
Low clouds are expected to persist through at least the first
half of the night until dry air advection dominates in the wake
of the cold front. Depending on how much rain areas see this
morning, some fog may develop as well, but the low clouds should
inhibit widespread fog development.

Models have trended slightly later with the arrival of the cold
front, as a result expect low clouds to linger a bit longer, and
thus there will be a shorter opportunity for efficient
radiational cooling, especially for the coastal plains.

Therefore, temperatures from the i95 corridor to the east may
not drop off that much overnight.

Long term /Tuesday through Sunday/
Draft draft draft for the 330 pm discussion:
**flood potential may exist where its rained more than 2 inches
today in snj and the delmarva**
12z NAM not applied for this discussion. Its not off to a good
start for today.

500mb: 500mb: a sharpening and unusually strong high amplitude
trough in the nations midsection will closed off and weaken as
it moves to new england Friday, with ridging to follow this
weekend. The next trough will be organizing in the great lakes
region early next week.

Temperatures: calendar day averages Wednesday-Saturday near
normal warming Sunday and Monday to nearly 5 above normal,
ahead of the next trough.

Forecast basis: a 50 50 blend of the 12z/22 gfs/nam MOS for
Tuesday night through Wednesday night, then the 12z/22 gfs
mex MOS for Thursday with the 15z wpc guidance for Thursday
night-next Monday. Any substantial deviations from the basis
above, will be noted:
the dailies...

forecaster confidence is below average on details through Friday
morning.

Tuesday night through Wednesday... Depending on the path of
the next coastal... A risk of rain south and probably dry north.

Thursday... Looks wet in warm air advection.

Friday... After any early morning showery rains depart with the cold
frontal passage... A breezy west wind should develop with
afternoon warming.

Memorial day weekend... Warming will continue in the lower levels
with a strengthening west to southwest flow as high pressure
starts to build in from the southwest. Showers may approach from
the west late Monday but for now... We'll consider that possibility
as a low probability of occurrence prior to sundown Monday
evening the 29th.

Aviation /16z Monday through Friday/
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.

Ifr conditions will continue across the area through the day
today. Kabe and krdg remain MVFR, but they are also expected drop
to ifr during the next couple of hours. The heaviest showers
are expected through 18z, but chances for rain exist through
00z. There is a slight chance for thunderstorms but it is too
uncertain at this time to include in the tafs.

Even as the precipitation begins to taper off after 18z, expect
the low clouds to linger through the rest of the day time hours.

If there are breaks in the clouds late this afternoon into the
evening hours, patchy fog may develop.

Conditions should begin to improve after 06z behind a cold front
which will bring in drier air.

Outlook...

draft for the 330 pm issuance.

Forecaster confidence on details is below average Tuesday night
through Friday morning.

Tuesday night...VFR conditions north and possibly the entire area
but a risk of MVFR/ifr in rain vicinity kmiv/kacy. Light
northeast wind.

Wednesday...VFR except possible MVFR/ifr conditions during the
morning kmiv and kacy. East to northeast wind gusts to 15 mph.

Thursday...VFR CIGS with periods of MVFR/ifr in showers and isolated
thunderstorms. Easterly winds probably becoming southeast to
south at night.

Friday... Improving conditions after any early morning showers end
with mainlyVFR expected. Westerly wind gusts to 20 kt possible
in the afternoon.

Saturday...VFR. Westerly wind gusts to 20 kt.

Marine
Although some gusts above 20 kt are possible this evening, we
are expecting conditions to remain below SCA criteria today and
tonight. By this evening, fog may develop on both the delaware
bay and the coastal waters. However, it is uncertain at this
time how widespread or dense any fog will be. Any fog that does
develop is expected to dissipate in the pre-dawn hours as
northerly winds increase.

Outlook...

draft for the 330 pm issuance.

Forecaster confidence on this outlook section is below average
Tuesday night through Friday morning.

Tuesday night and Wednesday... Leftover SCA for hazardous seas
possible... Mainly the de atlantic coastal waters. Otherwise
northeast to east wind with gusts generally under 20 kt.

Thursday... SCA probable for the well organized ohio valley low.

East to southeast winds build the seas to b between 5 and 8
feet on the atlantic waters.

Friday... SCA may continue for leftover hazardous seas on the
atlantic portion of our coastal waters. Westerly wind develops
with gusts to 20 kt.

Saturday... Small chance an SCA for westerly nearshore gusts of
20 to 25 kt.

Hydrology
1137am: dox and dix sta (dp)/stp (legacy) are underestimating
rainfall. Ditto mrms. We are using ffmp hpe. Pns for 1.75 inch
or greater amts will post soon as we are seeing numerous reports
of 1.5 to 2.5 inch rainfall since 230 this morning. At this
time... Dix stp (legacy is performing best vs its dp). Dox
stp/sta are almost identical and far too low.

The flood advisory updated statement (fls) will post soon. At
1pm we will consider extending the nj portion and cancel the md
de portion.

The flood advisory for generally nuisance potentially travel
slowing/altering poor drainage street flooding continues. This
advisory is because of overrunning along and just north of the
warm front that shows light southerly flow in the warm sector
and light northeast flow just north of the boundary. Pwat is
near 1.75 inches. 12z NAM is off to a poor start.

Tides/coastal flooding
Draft for 330 pm discussion:
astronomical tides are at some of their highest of the year this
Wednesday and Thursday evenings. Some onshore flow will contribute
positive departures and its probable that a few locations along
the atlantic coasts of de and nj will exceed the minor coastal
flood advisory threshold. It only takes about .6 to .7 feet
above high tide to reach the threshold. It's all in the details,
which are yet to be confidently determined. This mornings
12z/22 NAM does not loom to be off to a good start. We will
eight its guidance less than other traditionally used models.

For now the sit and etss modeling forecasts minor with a small
chance of a moderate episode if prior to high tide onshore is
strong enough for enough duration.

Climate
Record daily rainfall at acy has a good chance of exceedance.

1.19 inches is the daily record set in 1909. As of 1205 pm 1.13
inches... Appears well on its way to a record for this date.

Phi watches/warnings/advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... None.

Synopsis... Meola
near term... Johnson/robertson
short term... Johnson
long term... Drag/meola
aviation... Drag/johnson/meola
marine... Drag/johnson/meola
hydrology...

tides/coastal flooding...

climate... 1207p


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 5 mi60 min ENE 4.1 G 5.1 61°F 67°F1017.2 hPa
RDYD1 - 8551910 - Reedy Point, DE 8 mi60 min 60°F 66°F1016.7 hPa
DELD1 - 8551762 - Delaware City, DE 8 mi60 min ENE 1.9 G 2.9 60°F 65°F1017.2 hPa
44057 - Susquehanna, MD 18 mi46 min NNE 3.9 G 3.9 61°F 1016.7 hPa
MRCP1 - 8540433 - Marcus Hook, PA 24 mi60 min 60°F 1017.2 hPa
SJSN4 - 8537121 - Ship John Shoal, NJ 25 mi60 min E 2.9 G 5.1 61°F 65°F1016.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 36 mi60 min ESE 1.9 G 4.1 61°F 66°F1017.2 hPa
PHBP1 - 8545240 - Philadelphia, PA 41 mi60 min 61°F 64°F1016.9 hPa
44043 - Patapsco, MD 45 mi46 min S 3.9 G 3.9 61°F 1017.7 hPa
BDSP1 46 mi60 min 60°F 1017.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 48 mi60 min ESE 1.9 G 1.9 61°F 1017.2 hPa
FSNM2 48 mi66 min SE 1.9 G 2.9 60°F 1017 hPa
BLTM2 - 8574680 - Baltimore, MD 49 mi60 min SSE 1.9 G 2.9 62°F 69°F1016.9 hPa

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wilmington, New Castle County Airport, DE11 mi45 minNE 39.00 miLight Rain61°F60°F97%1017.2 hPa
Phillips Army Air Field / Aberdeen, MD24 mi98 minE 43.00 miLight Rain Fog/Mist60°F59°F97%1017.9 hPa

Wind History from ILG (wind in knots)
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Last 24hrS11S16
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S15S15S15S13S13SE11SE10SE7SE9SE6E7E7E6NE5E6E4E7E6CalmE4SE4NE3
1 day agoNE11NE9NE12
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E11NE11NE10E8SE8SE5SE6SE4SE4E5E5E3CalmN3E8E9NE7SE8E10S9
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2 days agoW11W11SW10W10W10SW10W10W5W9W3W5S3NE4NE10NE15NE12NE9NE11E13NE13NE18NE15NE14E11
G17

Tide / Current Tables for Summit Bridge, Chesapeake and Delaware Canal, Delaware
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Summit Bridge
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Mon -- 02:24 AM EDT     0.35 feet Low Tide
Mon -- 03:49 AM EDT     Moonrise
Mon -- 05:42 AM EDT     Sunrise
Mon -- 08:17 AM EDT     3.83 feet High Tide
Mon -- 02:43 PM EDT     0.18 feet Low Tide
Mon -- 04:34 PM EDT     Moonset
Mon -- 08:16 PM EDT     Sunset
Mon -- 08:47 PM EDT     4.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.70.40.41.12.12.93.53.83.732.11.30.70.30.20.61.62.73.544.23.72.9

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
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Mon -- 01:32 AM EDT     0.08 knots Slack
Mon -- 03:49 AM EDT     Moonrise
Mon -- 04:48 AM EDT     2.09 knots Max Flood
Mon -- 05:43 AM EDT     Sunrise
Mon -- 07:36 AM EDT     -0.08 knots Slack
Mon -- 10:30 AM EDT     -1.79 knots Max Ebb
Mon -- 01:19 PM EDT     0.07 knots Slack
Mon -- 04:34 PM EDT     Moonset
Mon -- 05:00 PM EDT     2.05 knots Max Flood
Mon -- 07:28 PM EDT     -0.01 knots Slack
Mon -- 08:17 PM EDT     Sunset
Mon -- 10:56 PM EDT     -2.26 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.5-0.90.81.522.11.81.1-0.8-1.5-1.7-1.7-1.4-0.70.91.41.92.11.81.1-1.1-1.8-2.1-2.3

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Philadelphia/Mount Holly, PA (13,3,4,5)
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Ground Weather Radar Station Dover AFB, DE
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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.