Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Rehoboth Beach, DE

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:02AMSunset 7:16PM Thursday March 21, 2019 6:15 PM EDT (22:15 UTC) Moonrise 7:07PMMoonset 6:42AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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ANZ454 Coastal Waters From Cape May Nj To Cape Henlopen De Out 20 Nm- Coastal Waters From Cape Henlopen To Fenwick Island De Out 20 Nm- 357 Pm Edt Thu Mar 21 2019
.gale warning in effect through Saturday afternoon...
Tonight..E winds 20 to 25 kt with gusts up to 40 kt, becoming se 15 to 20 kt with gusts up to 30 kt late this evening, then becoming sw 10 to 15 kt with gusts up to 25 kt after midnight, becoming W 20 to 25 kt with gusts up to 30 kt late. Seas 7 to 10 ft, subsiding to 5 to 8 ft late. SWell mainly from the se with a dominant period of 9 seconds. Rain early this evening, then a chance of rain late this evening and overnight. Areas of fog. Vsby 1 to 3 nm.
Fri..W winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Gusts up to 40 kt. Seas 4 to 7 ft, subsiding to 3 to 5 ft early in the afternoon. SWell mainly from the se with a dominant period of 8 seconds. A chance of showers early in the morning. A chance of showers in the afternoon.
Fri night..W winds 20 to 25 kt with gusts up to 35 kt, increasing to 25 to 30 kt with gusts up to 45 kt in the late evening and overnight. Seas 4 to 6 ft. SWell mainly from the W with a dominant period of 9 seconds. A chance of showers early in the evening.
Sat..NW winds 25 to 30 kt with gusts up to 45 kt, diminishing to 20 to 25 kt with gusts up to 40 kt in the afternoon. Seas 4 to 6 ft, subsiding to 3 to 4 ft early in the afternoon. SWell mainly from the nw with a dominant period of 9 seconds.
Sat night..NW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 4 ft.
Sun..W winds 10 to 15 kt with gusts up to 20 kt, becoming sw in the afternoon. Seas 2 ft or less.
Sun night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less, then around 3 ft after midnight.
Mon..SW winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft.
Mon night..W winds 10 to 15 kt with gusts up to 20 kt, becoming ne 15 to 20 kt with gusts up to 30 kt after midnight. Seas 3 to 5 ft. A chance of showers in the evening, then a chance of rain and snow showers after midnight.
Tue..NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of rain and snow showers in the morning. Vsby 1 to 3 nm.
Tue night..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
ANZ400 357 Pm Edt Thu Mar 21 2019
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. Low pressure will strengthen as it moves northeast through the mid- atlantic region tonight and into new england on Friday. Behind the low, a cold front will cross our region on Friday. Over the weekend, the low will move farther away into the canadian maritimes, while high pressure will build in from the great lakes on Saturday and then shift to our south on Sunday. A cold front is forecast to cross the area on Monday, followed by high pressure for much of the remainder of next week.


7 Day Forecast for Marine Location Near Rehoboth Beach, DE
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location: 38.72, -75.08     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 212113
afdphi
area forecast discussion
national weather service mount holly nj
513 pm edt Thu mar 21 2019

Synopsis
Low pressure will strengthen as it moves northeast through the
mid- atlantic region tonight and into new england on Friday.

Behind the low, a cold front will cross our region on Friday.

Over the weekend, the low will move farther away into the
canadian maritimes, while high pressure will build in from the
great lakes on Saturday and then shift to our south on Sunday. A
cold front is forecast to cross the area on Monday, followed by
high pressure for much of the remainder of next week.

Near term until 6 am Friday morning
Low pressure continues to strengthen as it is currently near the
virginia coast and moving northward. Bands of moderate to heavy rain
continue to move into the area from the S SE with the heaviest so
far having been over the DELMARVA and portions of SE pa through
chester county where around an inch has already fallen in spots. In
addition, ese winds have been strengthening.

As we head through the latter part of this afternoon into this
evening, the rain will continue to fall moderate to heavy at times
with the heaviest continuing to be over eastern pa as well as
portions of the delmarva. Some indication on radar of a dry slot
working north but high res models such as the hrrr show this tending
to fill in. Also, rain amounts so far have overperformed so even if
further amounts are a bit lighter than expected thinking still is
this will add up to a storm total of 2 to 2.5 inches of rain over
much of eastern pa. Thus, flooding remains a concern and this is
detailed further in the hydro section below. The flood watch remains
in effect through tonight and covers the i-95 corridor N W through
most of our eastern pa zones except carbon and monroe counties.

Also, coastal flooding remains a concern and this is detailed in the
tides section below.

By the overnight period, the heaviest of the rain will begin to wind
down as the center of low pressure cuts right across the area then
onward towards long island. Still expecting though that some lighter
rain and wrap around showers continue overnight especially for
northern and eastern zones. Also, as cooler air wraps in on the
backside of the low we actually expect rain to change over to snow
over the southern poconos where a couple inches could accumulate.

By morning, temperatures will generally be in the low 40s
except 30s over the southern poconos and NW nj.

Short term 6 am Friday morning through Sunday
The low will continue to deepen through Friday as it moves ne
through new england. Main concern for Friday and beyond will be
strong winds on the backside of the system due to the strong
pressure gradient, deep mixing, and cold advection pattern.

Friday morning may end up mainly dry before a strong shortwave
associated with the main upper level low drops S E into the area.

This will result in scattered showers redeveloping that could
continue to be mixed with some snow across higher elevations in the
southern poconos. Otherwise main focus will be on the winds. Winds
will ramp up through the day and expect by mid to late afternoon
w NW winds will be 15 to 25 with gusts of at least 30 to 40 mph.

Winds will likely be even stronger for a time Friday night. Highs
Friday will range from the upper 30s to mid 40s over the southern
poconos and NW nj to the upper 40s to low 50s elsewhere.

Friday night... Secondary cold front crosses the area early in the
evening potentially resulting in a surge of stronger wind gusts.

Profiles indicate 40 to 50 knot winds in the boundary layer but
limiting factor for full mixing will be loss of heating with the
diurnal cycle. Nevertheless, still think there will be a good
potential for wind gusts at least 35 to 45 mph to be realized across
much of the area so wind advisory may end up be needed. Otherwise,
except for some scattered snow showers continuing in the southern
poconos conditions should become mainly dry. Lows by Saturday
morning will range from the 20s across the southern poconos and nw
nj to the low to mid 30s elsewhere.

For Saturday, the low pulls away into the canadian maritimes with
strong NW winds continuing in its wake as high pressure moves into
the ohio valley keeping a tight gradient over the area. Otherwise it
will be dry but seasonably cool under mainly sunny skies.

High pressure moves in for Saturday night and Sunday resulting in
winds finally diminishing with temperatures returning to
seasonable by Sunday afternoon under continuing mainly clear
skies.

Long term Sunday night through Thursday
This extended forecast period will start out with a fairly strong
cold front passage on Monday, followed by canadian high pressure for
Tuesday through Thursday. On Monday a shortwv trof is forecast to
move east into the ohio valley with moisture spreading ahead of it
across the mid-atlantic region. Both the latest GFS and ecmwf
are showing precip spreading across the area on Monday and
continuing into Monday night in association with this feature
and with the frontal passage.

Temperatures ahead of the front on Monday should be warm enough for
rain everywhere, but fairly strong cold advection behind the front
may result in precip changing to snow from north to south Monday
night. No significant snow accumulation is expected at this time.

Temperatures on Tuesday and Wednesday look to be a bit below normal,
but may moderate to near normal again by Thursday.

Aviation 21z Thursday through Tuesday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.

Through tonight... Low pressure will intensify as it moves
northeast through coastal de and nj this evening and tonight.

This will result in relatively poor flying conditions through
most of tonight. CIGS will generally range between low MVFR and
ifr. Vsbys will beVFR at times but will be lower in areas of
heavier rainfall. Precip should end from south to north during
this evening, but CIGS will remain mostly ifr overnight. Winds
will veer from ene to NW with the passage of the low
Friday... Conditions should improve toVFR by mid-morning but nw
winds will likely gust 25 to 30 kt during day. Brief local MVFR
conditions are possible in scattered showers.

Outlook...

Friday night and Saturday...VFR conditions expected but NW winds
will continue to gust 30 to 35 kt.

Saturday night through Sunday night...VFR conditions with winds
generally 10 kt or less.

Monday and Monday night... MVFR countdowns possible in areas of
rain or snow showers. Winds around 10 kt shifting from SW to n
on Monday.

Tuesday...VFR conditions with NE winds around 10 kt.

Marine
Easterly and southeasterly gale force gusts are expected to continue
through the evening hours. A gale warning is now effect for the
delaware bay and the delaware and nj coastal waters. There may be a
lull in the gale conditions late tonight as the wind direction
shifts to northwesterly. However, by Friday morning, wind speeds are
expected to be above gale force once again. Northwesterly gales will
then continue through the day on Friday.

Outlook...

Friday night and Saturday... Northwesterly gales continue for much of
this period, but wind speeds should gradually drop off late
Saturday into Saturday night.

Sunday into Monday... Winds and seas are expected to be below small
craft advisory conditions.

Monday night and Tuesday... Northeasterly winds are likely to
increase starting Monday night and continuing into Tuesday. Seas
should subsequently increase as well.

Hydrology
During the last 24 hours, forecast models have been trending upward
with their qpf, especially across SE pa. The 72 hour precip
forecast, out of the marfc, now has a large swath of 1.50 to 3.00
inches of rainfall across the southern poconos, berks county,
the lehigh valley, the philly suburbs, and NW nj.

As a result, our river stream forecast points are responding. We now
have about a dozen gages in at least caution action stage. While we
will see a significant response across nj, SE pa has a greater
chance to see water over banks. Across the intricate passaic basin
in northern nj, there are about 5 gages now forecast to climb above
caution stage. If the heaviest rainfall expands east into this area,
minor flooding would then be expected. The millstone river in the
raritan basin could also see some minor flooding.

With the heaviest rainfall expected across SE pa, this is where we
are seeing the most significant rises. Portions of the schuylkill
and brandywine are now expected to flood. The smaller creeks and
streams across SE pa and across northern delaware will also see
levels approach or exceed bankfull. Additionally, the perkiomen
creek, the neshaminy creek and portions of the lehigh system,
especially the headwaters of the little lehigh need to be monitored.

In terms of timing, the heaviest rains will fall between 18z today
and 06z tonight. Poor drainage and low-lying flooding, like it
always does, will initiate first. That will start to develop this
afternoon. This rain runoff will move into fast responding creeks
this evening. That water will then bleed into the larger rivers and
streams overnight.

If the rainfall and the flooding comes to fruition, I would expected
river flooding to persist across SE pa through at least the day
tomorrow. The passaic basin in nj responds more slowly. Any flooding
that might develop there will be slower to do so and most likely
last into the weekend.

Tides coastal flooding
No changes to the coastal flood warnings advisories have been
made this afternoon, with the general expectation that
widespread minor coastal flooding will occur with this evening's
high tide. Local moderate flooding may be observed in coastal
locations of middlesex and monmouth counties, though stevens
institute ensemble guidance is indicating the more likely
outcome is for levels just under moderate flood stage in most
locations.

In the advisory area of coastal new jersey and delaware, concern
is increasing for somewhat higher levels than guidance is
currently suggesting. Winds have been stronger than expected
this afternoon, with gale-force gusts occurring on delaware bay
and the atlantic waters for the past couple of hours. Models
have trended a little higher with projected gauge levels this
evening, and this makes sense owing to recent conditions. Though
widespread minor flooding is the more likely outcome in these
areas, some spotty instances of moderate flooding cannot be
ruled out. Minor flooding is also expected on the tidal
delaware river overnight.

Additionally, the slowing trend of the associated coastal low
with today's model runs leads to somewhat increased potential of
another round of minor flooding for Friday morning's high tide,
especially on the new jersey coast. If current trends continue,
additional advisories for this high tide will be required.

Strong offshore flow will commence on Friday, which will end
the coastal flooding threat for subsequent high tides.

No flooding is expected on the upper eastern shore of
chesapeake bay.

Phi watches warnings advisories
Pa... Flood watch through late tonight for paz060>062-070-071-
101>106.

Coastal flood advisory from 1 am to 6 am edt Friday for paz070-
071-106.

Nj... Flood watch through late tonight for njz007>010-012-015>019.

Coastal flood advisory until 1 am edt Friday for njz020>027.

Coastal flood advisory from 10 pm this evening to 2 am edt
Friday for njz016.

Coastal flood advisory from 1 am to 6 am edt Friday for njz015-
017>019.

Coastal flood warning until 2 am edt Friday for njz012>014.

De... Flood watch through late tonight for dez001.

Coastal flood advisory until 1 am edt Friday for dez002>004.

Coastal flood advisory from 10 pm this evening to 2 am edt
Friday for dez001.

Md... Flood watch through late tonight for mdz008-012.

Marine... Gale warning until 6 pm edt Saturday for anz430-431-450>455.

Synopsis... Amc
near term... Fitzsimmons
short term... Fitzsimmons
long term... Amc
aviation... Amc
marine... Amc johnson
hydrology... Fitzsimmons kruzdlo
tides coastal flooding... Cms


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LWSD1 - 8557380 - Lewes, DE 5 mi33 min ESE 18 G 25 49°F 46°F1002.7 hPa
CMAN4 - 8536110 - Cape May, NJ 18 mi27 min E 19 G 31 49°F 45°F1002.6 hPa
BRND1 - 8555889 - Brandywine Shoal Light, DE 19 mi27 min 1003.2 hPa
44009 - DELAWARE BAY 26 NM Southeast of Cape May, NJ 27 mi25 min 44°F8 ft1002.4 hPa (-4.1)
OCIM2 - 8570283 - Ocean City Inlet, MD 27 mi33 min ESE 12 G 19 50°F 45°F1002.6 hPa
DRSD1 - Delaware Reserve, DE 32 mi105 min E 6 50°F 1006 hPa50°F
SJSN4 - 8537121 - Ship John Shoal, NJ 43 mi27 min E 15 G 20 51°F 45°F1003.1 hPa

Wind History for Lewes, DE
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown - Delaware Coastal Airport, DE15 mi81 minE 144.00 miLight Rain55°F50°F83%1003.8 hPa
Wildwood, Cape May County Airport, NJ22 mi80 minE 17 G 278.00 miLight Rain50°F48°F93%1005.4 hPa

Wind History from GED (wind in knots)
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1 day agoSE7SE3SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3E7E13
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2 days agoSE3SE5CalmCalmCalmCalmCalmNW3CalmCalmCalmCalmNW3N4N6N10NE11
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Tide / Current Tables for Rehoboth Beach, Delaware
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Rehoboth Beach
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Thu -- 02:31 AM EDT     -0.86 feet Low Tide
Thu -- 07:02 AM EDT     Sunrise
Thu -- 07:41 AM EDT     Moonset
Thu -- 08:42 AM EDT     5.00 feet High Tide
Thu -- 02:59 PM EDT     -0.93 feet Low Tide
Thu -- 07:13 PM EDT     Sunset
Thu -- 08:07 PM EDT     Moonrise
Thu -- 09:12 PM EDT     5.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20-0.7-0.801.42.844.854.33.21.80.5-0.5-0.9-0.50.62.13.54.554.83.8

Tide / Current Tables for Delaware Bay Entrance, Delaware Current
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Delaware Bay Entrance
Click for Map
Thu -- 02:04 AM EDT     -1.87 knots Max Ebb
Thu -- 04:51 AM EDT     0.00 knots Slack
Thu -- 07:02 AM EDT     Sunrise
Thu -- 07:41 AM EDT     Moonset
Thu -- 07:47 AM EDT     2.06 knots Max Flood
Thu -- 11:04 AM EDT     -0.00 knots Slack
Thu -- 02:34 PM EDT     -1.96 knots Max Ebb
Thu -- 05:27 PM EDT     0.00 knots Slack
Thu -- 07:12 PM EDT     Sunset
Thu -- 08:07 PM EDT     Moonrise
Thu -- 08:17 PM EDT     1.98 knots Max Flood
Thu -- 11:27 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-1.6-1.9-1.6-0.90.11.11.92.11.710.1-0.8-1.4-1.9-1.9-1.4-0.50.61.521.81.30.4

Weather Map and Satellite Images
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GOES Local Image of Mid-Atlantic    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.
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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.