Monday, December9, 2019
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Marine Weather and Tides
Dover, NH

Version 3.4
NOTICE
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.
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 7:01AMSunset 4:09PM Monday December 9, 2019 4:57 AM EST (09:57 UTC) Moonrise 3:49PMMoonset 5:05AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 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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ANZ154 Coastal Waters From Cape Elizabeth, Me To Merrimack River, Ma Out 25 Nm- 335 Am Est Mon Dec 9 2019
.gale warning in effect from this evening through late tonight...
Today..S winds 10 to 20 kt with gusts up to 25 kt, increasing to 15 to 25 kt with gusts up to 35 kt this afternoon. Seas 4 to 6 ft, building to 5 to 8 ft this afternoon. A chance of rain this morning, then rain this afternoon. Vsby 1 to 3 nm.
Tonight..S winds 20 to 30 kt with gusts up to 45 kt. Seas 8 to 11 ft. Rain. Vsby 1 to 3 nm.
Tue..SW winds 15 to 20 kt, becoming 10 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 7 to 10 ft, subsiding to 5 to 8 ft in the afternoon. A chance of rain in the afternoon.
Tue night..NW winds 10 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. Rain likely in the evening, then rain or snow likely after midnight with vsby 1 to 3 nm.
Wed..N winds 5 to 10 kt. Seas 3 to 5 ft. Snow or rain likely, mainly in the morning. Vsby 1 to 3 nm.
Wed night..W winds 10 to 20 kt, becoming 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Thu night..NW winds 5 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Fri..SW winds 5 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Fri night..S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of rain. Vsby 1 to 3 nm.
ANZ100 335 Am Est Mon Dec 9 2019
Synopsis for stonington me to merrimack river ma out to 25 nm.. Low pressure approaches from the southwest today bringing increasingly strong winds, rain, and some fog through Tuesday. Weak low pressure will move well to the southeast of the waters Tuesday night and Wednesday allowing for some light snow Wednesday. Thereafter, the potentially potent low pressure system will approach Friday and may affect the waters over the weekend. &&


7 Day Forecast for Marine Location Near Dover, NH
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location: 43.2, -70.87     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 090935 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 435 AM EST Mon Dec 9 2019

SYNOPSIS. A milder and increasingly moist southerly flow this morning precedes a low pressure system approaching from the Great Lakes today. This system will bring mainly rain to the area Monday and Tuesday along with unseasonably mild air. The mild weather and snow melt combined with the rain could push a few rivers to near bankfull by late Tuesday. Much colder air follows this system Tuesday night and Wednesday perhaps allowing for a light accumulating snow for the coastal plain as well as southern New Hampshire. An active weather pattern looks to continue for late week into the weekend.

NEAR TERM /THROUGH TONIGHT/. Today, the pattern amplifies in response to a long wave trough axis driving south from the Plains of Canada into the upper Mississippi Valley and eventually into the Great Lakes. The long wave aloft picks up a closed mid-level low and transports it ENEward across the Great Lakes today and tonight, which drives sensible weather locally.

Light snow this morning over the mountains lifts northward as southerly flow strengthens ahead of the approaching trough. Dry air in place has prevented much of the precipitation from reaching the ground, except for across the mountains and areas north where moisture depth is more favorable. Further south, an area of precipitation presently over the Mid- Atlantic will expand as it travels NNEward toward New England. Expect precipitation, mainly rain, to enter southern New Hampshire mid to late morning, spreading northeastward into western Maine through mid- day. Chose to err on the slower side of guidance with 00Z sounding suggesting a stout mid-level dry layer to erode before precipitation reaches the ground. At the same time, increasing surface dew points and WAA over snowpack will lead to the development of patchy fog this morning, lasting through much of the day.

Mid-level warm advection is well on its way by this point with h850 temperatures reaching above freezing areawide about 12Z- 17Z. Meanwhile at the surface, some degree of a CAD is expected to stunt warming initially, and preserve some cooler pockets, but in general temperatures rise above freezing across lower elevations by noon. A brief period of mixed precipitation may impact interior NH and western ME upon onset as h850 warming outpaces surface warming, but without significant impacts.

The core of strong mid-level winds driving rounds of rain today strengthens later today into tonight as a short wave trough axis rotates around the larger mid-level low. This ramps up forcing and moisture transport, yielding moderate rain and increasing winds. Better mixing with the crossing jet will allow temperatures to warm through tonight as WAA continues aloft. Mixing isn't however strong enough to transport a strong portion of h850 winds in excess of 70kts to the surface. The southerly clip to winds near the surface does however allow strong winds to develop over the waters and to an extent over the MidCoast of Maine including the Penobscot Bay area. BUFKIT soundings generally paint sustained winds 20-25 kts along the coast and higher terrain of the MidCoast region with occasional gusts 35-45kts. A wind advisory has been posted for this evening into tonight as a result.

For rain, expecting widespread amounts exceeding an inch across southern NH and coastal Maine along with in the south-facing upslopes of the Whites where rainfall totals may approach two inches. More details on this in the hydrology section below. Expect a substantial erosion of snowpack as a result tonight thanks to breezy conditions, high dew points, and rainfall. The broad area of stratiform rain exits to the northeast late tonight.

SHORT TERM /TUESDAY/. For the better part of Tuesday, a lull in precipitation is expected behind the departing shortwave trough axis with dry air intruding in the upper levels, coinciding with a strengthening jet aloft. New England is placed in the right/exit region of this screaming jet in excess of 170kts at h300, leading to with synoptic descent. The exception would be light rain in southwest facing upslopes. Later in the afternoon into the evening, a lagging cold front crosses, with some uptick in precipitation activity but likely without much in the way of significant QPF. Cold advection does however spill in aloft behind the cold front and begins an airmass change for the region. Expect remaining light rain to switch to snow Tuesday evening.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. The long term periods starts Tuesday evening with a cold front just offshore and cold air bleeding into all of our zones from the northwest. At the same time a short wave trough will approach from the west, with some influence from the southern stream. The various members of the 00z model suite are in good agreement with some light overrunning precipitation moving northeastward in the wake the SFC cold front Tuesday night into Wednesday. With the column becoming colder with time, any light rain will turn to light snow from west to east as Tuesday night progresses. An ensemble approach was employed with the QPF and temperature forecast, allowing for 1-3" of snow on the coastal plain as well as the southern portion of NH. There will be a tight moisture/precipitation gradient with northwestern sections of the forecast are not seeing anything except cirrus come Wednesday morning.

Thereafter fair weather follows for a few days, but the pattern continues busy with a few more potential fairly high amplitude weather systems on tap, one for the weekend and another for early next week. Some mixed precipitation may be involved for both, but at this time modeled amplification of the mid and upper level pattern suggest a couple of chances for heavy rain. Will continue to monitor.

AVIATION /08Z MONDAY THROUGH FRIDAY/. Short Term /Through Tuesday/ . A transition to MVFR ceilings from south to north is well underway this morning amid strengthening southerly to southwesterly flow. IFR in -ra and fg arrives across the south and coastal terminals by noon today, early afternoon further north. Additionally patchy fog may impact sites at times today with warm air over snowpack.

This afternoon, rainfall intensifies with increasingly gusty southerly winds and widespread IFR or worse ceilings and visibility. These conditions persist into tonight, with rain and associated VIS restrictions pulling out early Tuesday morning with winds turning southwesterly, although patchy may allow VIS restrictions to linger through the morning. CIG improvements are possible Tuesday in a lull between rounds of precipitation.

Of note, LLWS is a concern throughout the short term, primarily this evening with southerly to southwesterly LLWS on the order of 45-55 kts developing.

Long Term . Rain will change to light snow across the forecast area Tuesday night and last through a good portion of Wednesday. This will allow for IFR conditions, especially on the coastal plain of Maine and southern New Hampshire where 1-3" of snow will be possible later Tuesday night into Wednesday. VFR conditions are then expected Wednesday night through Friday night.

MARINE. Short Term /Through Tuesday/ . Southerly flow strengthens through today, ahead of an approaching frontal system. This evening and tonight, southerly gale force winds develop area wide with storm force winds impacting the eastern two-thirds of the waters including western Penobscot Bay. Winds decrease gradually Tuesday with SCAs persisting under gusty southwest flow, turning northwest Tuesday night behind a cold front.

Long Term . SCA conditions will linger through Tuesday night and Wednesday morning before diminishing. However, winds will quickly ramp up again to SCA levels Wednesday night and Thursday, with gales not out of the question.

HYDROLOGY. Mild temperatures, high dew points, and periods of rain will impact the area Monday and Tuesday and erode snow cover across the region, particularly over southern New Hampshire and coastal western Maine. While the fresh snow will initially absorb rainfall, the snow will likely ripen and begin melting. This will lead to an influx of water into local waterways. At this time, southern New Hampshire has over a foot of snow in places with liquid equivalent likely exceeding 1", with some areas possibly closer to 2". Moderate rainfall in excess of an inch is expected over this area and may lead to instances of localized flooding in poorly drained areas. River forecasts also suggests a flood threat for waterways, particularly across flashy tributaries in the Whites and southern New Hampshire. Although no flooding is forecast, action stage is expected to be reached on the Swift (Roxbury), Pemi (Woodstock), Suncook (N. Chichester), and on the Saco (Conway).

GYX WATCHES/WARNINGS/ADVISORIES. ME . Wind Advisory from 6 PM this evening to 4 AM EST Tuesday for MEZ022-027-028. NH . None. MARINE . Gale Warning from 6 PM this evening to 4 AM EST Tuesday for ANZ153-154. Storm Warning from 9 PM this evening to 4 AM EST Tuesday for ANZ150>152.



NEAR TERM . Casey SHORT TERM . Casey LONG TERM . Ekster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 10 mi193 min SW 2.9 35°F 1025 hPa29°F
CMLN3 13 mi174 min 1 42°F
WELM1 - 8419317 - Wells, ME 18 mi70 min SW 7 G 8.9
WEXM1 - Wells Reserve, ME 19 mi178 min SSW 5.1 34°F 28°F
IOSN3 - Isle of Shoals, NH 21 mi58 min SW 15 G 17 43°F 1023.9 hPa (-1.0)40°F
44030 - Buoy B0102 - Western Maine Shelf 24 mi114 min WSW 12 G 14 39°F 5 ft1024.6 hPa
44007 - PORTLAND 12 NM Southeast of Portland,ME 45 mi68 min SW 16 G 19 41°F 44°F6 ft1023.7 hPa (-0.8)35°F
44098 - Jeffrey's Ledge, NH (160) 46 mi50 min 48°F7 ft
CASM1 - 8418150 - Portland, ME 46 mi76 min 36°F 42°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 49 mi114 min SW 19 G 25 45°F 46°F5 ft1022.9 hPa

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rochester - Skyhaven Airport, NH6 mi67 minS 310.00 miOvercast32°F26°F79%1023.3 hPa
Pease Air Force Base / Portsmouth, NH8 mi62 minSW 510.00 miOvercast37°F30°F79%1024.1 hPa
Sanford, Sanford Regional Airport, ME16 mi62 minSW 310.00 miOvercast32°F27°F82%1024.6 hPa

Link to 5 minute data for KDAW

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Last 24hrCalmNW6NW4CalmCalm44S63S3S55S7S4S43S54Calm3CalmCalmS3Calm
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2 days ago34333Calm--34CalmCalmSE3CalmN3N5NW6NW6NW5W4W9NW113W5SW4

Tide / Current Tables for Salmon Falls River entrance, Piscataqua River, New Hampshire
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Salmon Falls River entrance
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Mon -- 04:04 AM EST     Moonset
Mon -- 04:23 AM EST     0.81 feet Low Tide
Mon -- 07:03 AM EST     Sunrise
Mon -- 10:21 AM EST     7.00 feet High Tide
Mon -- 02:48 PM EST     Moonrise
Mon -- 04:07 PM EST     Sunset
Mon -- 04:58 PM EST     0.37 feet Low Tide
Mon -- 10:50 PM EST     6.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.23.92.51.40.911.83.356.376.96.14.73.11.60.70.40.823.75.26.26.4

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Mon -- 12:44 AM EST     -1.60 knots Max Ebb
Mon -- 04:03 AM EST     Moonset
Mon -- 04:38 AM EST     0.00 knots Slack
Mon -- 06:36 AM EST     1.14 knots Max Flood
Mon -- 07:02 AM EST     Sunrise
Mon -- 10:34 AM EST     -0.00 knots Slack
Mon -- 01:19 PM EST     -1.77 knots Max Ebb
Mon -- 02:48 PM EST     Moonrise
Mon -- 04:07 PM EST     Sunset
Mon -- 05:20 PM EST     0.00 knots Slack
Mon -- 07:03 PM EST     0.89 knots Max Flood
Mon -- 10:50 PM EST     -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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-1.5-1.6-1.4-1.1-0.60.311.10.90.70.4-0.4-1.3-1.7-1.7-1.5-1.1-0.30.50.90.70.60.4-0.1

Weather Map
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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.
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Wind Forecast for Gray/Portland, ME (4,6,7,8)
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Ground Weather Radar Station Portland, ME
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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.