Saturday, January18, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
Dewey Beach, DE

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 7:15AMSunset 5:09PM Saturday January 18, 2020 9:49 AM EST (14:49 UTC) Moonrise 1:07AMMoonset 12:19PM Illumination 41% Phase: Third Quarter Moon; Moon at 23 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
ANZ455 Coastal Waters From Cape Henlopen To Fenwick Island De Out 20 Nm- 931 Am Est Sat Jan 18 2020
.small craft advisory in effect from 4 pm est this afternoon through late Sunday night...
Today..N winds around 5 kt, becoming S late this morning, then increasing to 10 to 15 kt with gusts up to 20 kt early this afternoon, increasing to 20 to 25 kt with gusts up to 30 kt late. Seas 3 to 5 ft. SWell mainly from the E with a dominant period of 10 seconds. A chance of snow late this morning. A chance of rain late this morning and early afternoon, then rain late. Vsby 1 to 3 nm late this morning and early afternoon.
Tonight..SW winds 20 to 25 kt. Gusts up to 30 kt. Seas 4 to 6 ft. SWell mainly from the se with a dominant period of 6 seconds. Rain, mainly in the evening.
Sun..W winds 15 to 20 kt, becoming nw 20 to 25 kt in the late morning and afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. SWell mainly from the S with a dominant period of 8 seconds.
Sun night..NW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. SWell mainly from the nw with a dominant period of 5 seconds.
Mon..NW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft.
Mon night..NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Tue..N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Tue night..N winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Wed..N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft.
Wed night..N winds 5 to 10 kt. Seas around 3 ft in the evening, then 2 ft or less.
ANZ400 931 Am Est Sat Jan 18 2020
Synopsis for the coastal waters from sandy hook nj to fenwick island de and for delaware bay.. Strong high pressure extended from quebec to the middle atlantic coast early this morning. The air mass will continue to move to the east. Low pressure was located in the upper mississippi river valley. The low will progress eastward, through the great lakes today and tonight, then across northern new england and nova scotia on Sunday. The low is forecast to pull a cold front through our region late tonight, followed by a secondary cold front on Sunday night. High pressure is expected to build from the north central states on Monday to the middle atlantic coast on Wednesday. The high should drift out to sea late in the week.


7 Day Forecast for Marine Location Near Dewey Beach, DE
   Hourly   EDIT   Help
location: 38.67, -75.08     debug


Area Discussion for - Philadelphia/Mount Holly, PA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KPHI 181440 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 940 AM EST Sat Jan 18 2020

SYNOPSIS. Strong high pressure extended from Quebec to the Middle Atlantic coast early this morning. The air mass will continue to move to the east. Low pressure was located in the upper Mississippi River Valley. The low will progress eastward, through the Great Lakes today and tonight, then across northern New England and Nova Scotia on Sunday. The low is forecast to pull a cold front through our region late tonight, followed by a secondary cold front on Sunday night. High pressure is expected to build from the north central states on Monday to the Middle Atlantic coast on Wednesday. The high should drift out to sea late in the week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 9:30 am update: Snow has begun to move into the region with the initial swath of higher reflectivity values moving across the CWA slightly faster than guidance had initially shown. It will have to work against the very dry air that still remains across much of the region with dew points still in the teens to single digits, leading to dew point depressions up to 20 degrees in some locations. This will continue to enhance wetbulbing effects early on as precipitation continues to work its way over the region. Adjusted temps and dew points to reflect current observations, otherwise, forecast is on par and current headlines look A-OK.

630 am update: 06z model suite not showing much change from the 00z runs. Did note that the NAM/NAM Nest continue to show a considerable amount of sleet late this afternoon northwest of I-95 and mainly west of the Delaware River. This would cut down on snow totals across the southern portions of the advisory area, but an extended period of sleet would likely lead to some tricky travel regardless. A period of sleet may occur in the Philly metro area as well, but expecting amounts to be sub- advisory. Nevertheless, will need to watch this potential closely, as sleet can accumulate quickly enough to generate some hazardous travel.

Notably, the NAM is also trending toward a farther east progression of freezing rain, nosing into at least Berks/Chester Counties. With the strength of warm advection in play (plus the likely too warm near-surface temperatures in general), did feel compelled to add a chance of freezing rain for a time late this afternoon and early this evening generally in the Reading/Pottstown/Coatesville areas. Icing would be minimal (and would be short-lived given the general warming trend through the evening).

Previous discussion .

A surface low in the central Plains will be lifting northeastward today toward the Great Lakes region, attendant to a fairly progressive midlevel trough moving through the central U.S. Strong warm advection will be occurring downstream of the surface low, with widespread precipitation to our west moving in by late this morning. Antecedent conditions are cold, with very dry low levels. As expected, models are a little too high with surface dew points this morning, and I continue to suspect that models are a little too aggressive saturating the low-level environment as the first wave of precipitation enters the region late this morning. Nevertheless, anticipating at least a period of snow with this first wave late this morning into early this afternoon, followed possibly by a bit of a lull (especially in the southern half to two-thirds of the CWA).

The stronger ascent associated with the approaching midlevel vort max arrives this afternoon, with precipitation rapidly increasing in this regime. With very strong 850-mb flow entering the region in advance of the trough, expect rapidly warming low-level profiles. However, initial wet-bulbing effects as well as stubborn lingering effects of the surface high affecting the region early this morning may keep low levels a little colder than general model consensus. As a result, think precipitation type will be predominantly snow north of the I-78 corridor and predominantly rain in central/southern Delmarva and far southern New Jersey. In between, a wintry mix of snow and sleet may occur, with precipitation types augmented by variations in intensity. The most intense precipitation rates should be from mid-to-late afternoon, which is the period where sleet is most probable. The larger overall trend, however, will be a transition to rain from south to north from mid-afternoon to early evening.

The increasingly marginal surface temperatures and potential variations in precipitation type lower confidence in snow totals. However, at least models have been reasonably consistent with the surface low track, precipitation timing, and QPF. With the inhibiting effects of antecedent dry near-surface air, potential periods of sleet, and general low-level warming, my inclination was to stay a little below model consensus with snow totals. The result is a forecast close to continuity, with totals near or below 1 inch along the I-95/I-195/I-295 corridors, 1-3 inches near the Fall Line, and 2-5 inches generally northwest of a Reading to Morristown line. One important note, however, is that if sleet is much more prevalent (a distinct possibility, as per the NAM/NAM Nest/WRF-NMM), lower overall snow totals may not translate to fewer impacts. Additionally, should sleet be less prevalent and temperatures remain a little colder than forecast, totals may be slightly higher across the board.

SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SUNDAY/. 630 am update: No changes to the forecast at this time. However, I continue to be worried about the post-precipitation environment, generally in the 02z to 07z time frame, where the low levels may remain saturated enough to generate some drizzle. Temperatures will be near freezing north of I-78, so some light ice accretion may occur. Confidence remains too low to add mention in the forecast, with primary impacts still expected to be associated with the afternoon/evening snow. Will pass along to the next shift, however.

Previous discussion .

As warming continues into the evening hours via continued warm/moist advection, precipitation will continue to trend toward rain toward the I-78 corridor. However, precipitation will likely shut off fairly quickly once the midlevel vort max moves through during the evening and advection becomes neutral. Most models shut off precipitation after 03z Sunday. As such, have moved up the expiration time of the winter weather advisory to 10 pm. Lingering rain/snow showers may occur the rest of the night (predominantly north of I-76), but most measurable precipitation should be over after midnight.

Will need to watch for some fog/drizzle potential after the precipitation shuts down. This will be dependent to some degree on winds (which may remain elevated as the surface low remains well north of the area). Some guidance, however, is suggesting a period of lighter winds. Model soundings keep the lowest levels near saturation, which may allow for some patchy fog and/or drizzle. Should this occur in the Poconos, the drizzle would likely freeze on contact. For now, not confident enough to mention (especially since there remain at least slight chances of snow showers anyway). However, will continue to monitor for this potential.

Temperatures will be fairly steady overnight after a slow rise during the evening hours.

LONG TERM /SUNDAY THROUGH FRIDAY/. Strong low pressure departing to our northeast, and high pressure approaching from the northwest and west will keep our region in a cold advection pattern from Sunday into Tuesday.

A gusty west wind is anticipated for Sunday. The wind direction is forecast to shift to the northwest on Sunday night with the arrival of a secondary cold front. We could see a few snow showers and scattered flurries from late Sunday into Monday, especially in eastern Pennsylvania, and in northern and central New Jersey.

The center of the high is forecast to settle in the vicinity of the Middle Atlantic coast for Wednesday and Thursday, bringing a mostly clear sky and dry weather conditions to our region.

Near normal temperatures are expected for Sunday, with readings falling below normal for Monday, Tuesday and Wednesday. Temperatures should rebound slightly above normal for Thursday, as the air mass continues to modify.

The high should begin to move out to sea on Thursday night and Friday. The surface flow is expected to become southerly and temperatures will likely remain above normal. There may be an increase in cloud cover as low pressure begins to approach from the west on Friday.

AVIATION /15Z SATURDAY THROUGH WEDNESDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Today . VFR conditions to start, but clouds will be lowering this morning. A period of snow may occur from late morning into early afternoon, but confidence is rather low on resultant CIGs/VSBYs given residual dry air near the surface. Precipitation will increase during the afternoon, with rapid deterioration to IFR conditions expected after 18z. Precip type will mainly be rain at MIV/ACY, though a period of sleet/snow may occur initially. At the Philly terminals, a transition from snow to sleet to rain is forecast (though types may vary frequently between 19z and 00z). At RDG/ABE, snow is expected initially, though transition to sleet and freezing rain is possible with time. Surface winds are expected to become southerly around 10 kt by afternoon. Southwest LLWS is forecast to develop late in the day.

Confidence is high with winds, moderate with low-level wind shear, moderate with precipitation timing, and low with onset of sub-VFR conditions and timing precipitation type transitions.

Tonight . Prolonged sub-VFR expected, as precipitation gradually winds down between 02z and 06z. CIGs/VSBYs may remain MVFR/IFR for much of the night, with improvement to VFR possible toward daybreak. Winds becoming southwest around 10 kt. Southwest LLWS in the evening. Moderate overall confidence.

OUTLOOK . Sunday . Mainly VFR. West wind 15 to 20 knots with gusts of 25 to 30 knots. High confidence.

Sunday night . Mainly VFR. West to northwest wind 10 to 15 knots with gusts of 20 to 25 knots. High confidence.

Monday . Mainly VFR. Northwest wind 10 to 15 knots with gusts of 20 to 25 knots. High confidence.

Monday night and Tuesday . VFR. Northwest wind around 10 knots. High confidence.

Tuesday night and Wednesday . VFR. Northwest wind 5 to 10 knots. High confidence.

MARINE. Conditions are currently below small craft advisory criteria. North or northeast winds early this morning will quickly become southerly by this afternoon and increase to near advisory thresholds late in the day. Seas will build quickly in this regime as well. Expecting advisory conditions to become established near or just after 21z (4 pm) on the Atlantic waters. Though somewhat marginal, a few gusts to advisory criteria may occur on the mouth of Delaware Bay as well. As a result, have hoisted a small craft advisory for these areas from late this afternoon onward.

Seas are expected to build to 5 to 7 feet tonight, with 20-25 kt south to southwest winds with occasional gusts to 30 kt. Sub- advisory conditions are expected on upper portions of Delaware Bay through tonight.

Precipitation should move in this afternoon on the waters, possibly as a mix of rain and snow to start with (before transitioning to all rain). Visibility restrictions can be expected. Rain should begin tapering off by midnight or shortly after.

OUTLOOK . Sunday and Sunday night . A Small Craft Advisory is in effect for a west to northwest wind gusting around 25 to 30 knots.

Monday . Northwest wind gusts around 25 to 30 knots are expected.

Monday night . Northwest wind gusts around 25 knots are possible.

Tuesday through Wednesday . No marine headlines are anticipated.

PHI WATCHES/WARNINGS/ADVISORIES. PA . Winter Weather Advisory until 10 PM EST this evening for PAZ054-055-060>062-101-103-105-106. NJ . Winter Weather Advisory until 10 PM EST this evening for NJZ001-007>010-012-015. DE . None. MD . None. MARINE . Small Craft Advisory from 4 PM this afternoon to 6 AM EST Monday for ANZ431-450>455. Small Craft Advisory from 6 AM Sunday to 6 AM EST Monday for ANZ430.

Synopsis . Iovino Near Term . CMS/Davis Short Term . CMS Long Term . Iovino Aviation . CMS/Iovino Marine . CMS/Iovino


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
LWSD1 - 8557380 - Lewes, DE 8 mi49 min 31°F 42°F1035 hPa (-2.1)
BRND1 - 8555889 - Brandywine Shoal Light, DE 22 mi55 min 33°F 1035.4 hPa
CMAN4 - 8536110 - Cape May, NJ 22 mi49 min 27°F 43°F1034.7 hPa (-2.4)
OCSM2 23 mi169 min 3 ft
OCIM2 - 8570283 - Ocean City Inlet, MD 24 mi55 min 35°F 44°F1035.9 hPa
44009 - DELAWARE BAY 26 NM Southeast of Cape May, NJ 25 mi59 min SSE 5.8 G 9.7 34°F 49°F3 ft1031.5 hPa (-2.5)
SJSN4 - 8537121 - Ship John Shoal, NJ 47 mi49 min 28°F 43°F1035.1 hPa (-1.8)

Wind History for Lewes, DE
(wind in knots)    EDIT      (on/off)   Help
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
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
Last
24hr
N28
G34
N26
N23
G29
N23
G29
N21
N18
N17
G23
NW7
G22
N17
G21
N15
G19
N18
NW17
G21
NW14
G17
NW14
G19
N13
G16
N14
NE12
G15
N8
G14
NE6
G9
NE5
SE4
E3
SE2
SE4
1 day
ago
NW21
NW25
NW26
G33
NW24
G29
NW20
G26
NW29
G35
NW19
G28
NW27
G35
NW24
G31
NW20
NW28
G34
NW28
G36
NW24
G29
NW27
NW29
NW26
NW28
G36
NW23
G32
NW26
G34
NW26
G33
NW32
G39
NW27
G34
NW24
G31
NW27
G34
2 days
ago
NW11
G14
N8
N6
G9
NE3
NE6
NE4
E4
E2
SE3
SE4
S5
G9
S6
G10
S7
G11
S5
G8
S4
G7
S6
S8
G13
S7
G11
SW9
G15
SW9
G16
SW9
G12
W10
G13
W17
G22
W18

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown - Delaware Coastal Airport, DE15 mi55 minSSW 410.00 miOvercast29°F16°F58%1034.9 hPa

Link to 5 minute data for KGED

Wind History from GED (wind in knots)
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
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last 24hrNW12
G19
N11
G19
N9
G18
N14
G19
N9
G19
N9N9N4N3NW3NW4CalmNE3CalmCalmN4N3CalmCalmCalmNE3CalmSE4S4
1 day agoNW11
G23
NW12
G23
NW10
G22
NW19
G28
NW10
G23
NW16
G32
NW16
G27
NW13
G20
NW9
G16
NW8
G20
NW12
G26
NW9
G21
NW12
G21
NW9
G17
NW6NW8
G19
5--NW7N5N10
G16
N7
G16
N6N10
G21
2 days ago33W4CalmCalmCalmSE5SE7SE4S7S7S9S7S7S7S7S9SW8SW6SW6SW9W7NW11
G18
NW16
G27

Tide / Current Tables for Rehoboth Beach, Delaware
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Rehoboth Beach
Click for Map
Sat -- 01:07 AM EST     Moonrise
Sat -- 01:46 AM EST     4.09 feet High Tide
Sat -- 07:15 AM EST     Sunrise
Sat -- 08:05 AM EST     0.12 feet Low Tide
Sat -- 12:19 PM EST     Moonset
Sat -- 02:02 PM EST     3.56 feet High Tide
Sat -- 05:05 PM EST     Sunset
Sat -- 08:24 PM EST     -0.12 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
3.33.94.13.62.81.81.10.40.10.311.92.73.33.63.32.61.710.3-0.1-00.61.5

Tide / Current Tables for Delaware Bay Entrance, Delaware Current
   EDIT      (on/off)   Help   One Week of Data
Delaware Bay Entrance
Click for Map
Sat -- 12:46 AM EST     1.63 knots Max Flood
Sat -- 01:07 AM EST     Moonrise
Sat -- 04:08 AM EST     -0.00 knots Slack
Sat -- 07:15 AM EST     Sunrise
Sat -- 07:37 AM EST     -1.41 knots Max Ebb
Sat -- 10:34 AM EST     0.00 knots Slack
Sat -- 12:19 PM EST     Moonset
Sat -- 01:16 PM EST     1.34 knots Max Flood
Sat -- 04:23 PM EST     -0.00 knots Slack
Sat -- 05:05 PM EST     Sunset
Sat -- 07:57 PM EST     -1.36 knots Max Ebb
Sat -- 10:44 PM EST     0.00 knots Slack
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
1.51.61.30.80.1-0.5-1-1.3-1.4-1-0.40.311.31.20.80.2-0.4-0.9-1.2-1.4-1.1-0.50.2

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 Philadelphia/Mount Holly, PA (9,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Dover AFB, DE
   (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.