Thursday, January21, 2021
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Marine Weather and Tides
Hampton, NH

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:06AMSunset 4:42PM Thursday January 21, 2021 10:23 PM EST (03:23 UTC) Moonrise 12:30PMMoonset 1:33AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 649 Pm Est Thu Jan 21 2021
Tonight..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt late this evening and overnight. Seas around 2 ft. A slight chance of snow after midnight. A chance of snow and rain late. Vsby 1 to 3 nm after midnight.
Fri..W winds 5 to 10 kt. Seas 1 foot or less.
Fri night..NW winds 5 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 3 ft.
Sat..NW winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Seas 2 to 4 ft.
Sat night..NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft.
Sun..NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft.
Sun night..NW winds 15 to 20 kt, becoming 10 to 20 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft.
Mon..NW winds 10 to 15 kt. Seas around 2 ft.
Mon night..N winds 10 to 15 kt. Seas around 2 ft.
Tue..N winds 10 to 15 kt. Seas around 2 ft.
Tue night..NW winds 15 to 20 kt. Seas 2 to 3 ft.
ANZ100 649 Pm Est Thu Jan 21 2021
Synopsis for stonington me to merrimack river ma out to 25 nm.. SEveral rounds of snow showers and squalls will be possible over the coastal waters through Friday. The strongest cold air advection and Thus higher winds and seas are expected over the weekend.


7 Day Forecast for Marine Location Near Hampton, NH
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location: 42.97, -70.73     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 212356 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 656 PM EST Thu Jan 21 2021

SYNOPSIS. Pockets of snow showers will be the rule later through Saturday with enhancement in the mountains and the Mid-Coast as a weak are of low pressure drops out of southern Canada. The weekend will be noticeably colder and blustery with breezy NW winds Saturday into Sunday. Winds will relax with moderating temperatures Monday. A southern stream system will approach Tuesday although this system looks to pass to our south with southern areas having the best chance to see some light snow.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. Have made minor adjustments to the forecast this evening based on latest observational trends as well as trends in mesoscale model output. mainly dry out there now except for some light snow continuing in the mountains. Eventually another short wave trough approaches and aids in an area of light snow developing across a good portion of the forecast area, except far south. An inch or two of snow may fall overnight in a couple of spots, but in general, an inch or less is expected.

Previously .

Impacts: Brief reductions in visibility possible in any snow showers through this evening. Cloud also lead to slick roads.

There is some light snow ongoing for many locations this afternoon, but unlike yesterday afternoon, it's been less showery and more stratiform in nature. Regardless, snowfall amounts through tomorrow morning will remain on the lighter side, generally less than an inch for most with locally higher amounts possible in the Whites.

As this shortwave rotates through the region this evening, any remaining snowfall will quickly come to an end outside the mountains. However, another system will approach the region tonight and bring another round of light snow to much of the region, primarily in the early morning hours. Again, amounts will be very light, ranging from a dusting to a few tenths outside of the mountains to closer to an inch in the mountains. Temperatures will be a bit warmer than last night, ranging from the lower to mid teens north to the mid 20s south.

SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/. Impacts: Brief reductions in visibility will be possible in any snow showers. Could also lead to slick roads.

A cold front associated with a weak area of low pressure will sweep through the region tomorrow, allowing snow showers to continue through the day. The best chances will remain in the mountains where some orographic enhancement will help things along. Snow showers will linger through Friday night in the wake of the cold front. Do want to mention the potential for heavier amounts on the Midcoast due to the development of an inverted trough; forecast snowfall amounts are higher there already than the rest of western ME but will continue to monitor the potential for more.

LONG TERM /SATURDAY THROUGH THURSDAY/. The weekend will begin with a fairly zonal flow in place across eastern North America with a strong negative NAO and AO in place as a blocking high pressure remains over Greenland.

Through the weekend we move from a zonal flow across to amplification of a trough over the western portion of the continent by early next week, with an amplification in the east coast not evident until early next week. This corresponds to a increase in NAO and AO as the blocking high weakens and retrogrades allowing the circumpolar flow to once again move through our region.

For the weekend we start out with high pressure to our west and departing low to our east providing a steady pressure gradient for NWly flow. This flow will continue overnight Saturday, which will keep the temperatures from dropping as low as they otherwise might have. Still in January with colder air moving in temperatures near zero across the north is expected.

For Sunday the winds decrease somewhat, and could see a few of the deeper valleys going calm Sunday night. Have trended slightly colder for temperatures in these locations, but will be highly variable with the potential for winds.

At the start of the week, ensemble guidance continues to show fairly high confidence for low pressure to develop over the Ohio river valley early next week. This low will then slide eastwards into the Atlantic. The consensus continues to be for this disturbance to remain south of our area, and thus have kept the highest pop of the time period through the southern border for Tuesday into Thursday.

AVIATION /00Z FRIDAY THROUGH TUESDAY/. Short Term . Light snow showers should be coming to an end at all terminals except for HIE this evening. Another wave moves through tonight into tomorrow with additional chances for light snow at AUG and possibly at RKD and PWM. Continued light snow showers at times Friday into Friday night.

Long Term . VFR with northwesterly flow will rule the pattern through the weekend. Next chance for flurries will be early next week as low pressure moves south of the region.

MARINE. Short Term . No concerns in the short term as winds and seas remain below SCA criteria.

Long Term . NWly flow will bring SCA conditions to the waters on the weekend, a low passes south of the waters early next week.

GYX WATCHES/WARNINGS/ADVISORIES. ME . None. NH . None. MARINE . None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
IOSN3 - Isle of Shoals, NH 6 mi84 min WSW 7 G 8 31°F 1002.5 hPa (-0.9)21°F
CMLN3 7 mi200 min 43°F
BGXN3 - Great Bay Reserve, NH 8 mi99 min Calm 26°F 1003 hPa22°F
44073 11 mi200 min WSW 7.8 G 9.7 32°F 41°F
44030 - Buoy B0102 - Western Maine Shelf 22 mi140 min WSW 7.8 G 9.7 31°F 2 ft1002 hPa
WELM1 - 8419317 - Wells, ME 26 mi84 min NNW 1 G 1 28°F 41°F1003.1 hPa (-0.8)
WEXM1 - Wells Reserve, ME 27 mi84 min Calm 26°F 19°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 32 mi140 min W 14 G 16 36°F 2 ft1001.8 hPa
44098 - Jeffrey's Ledge, NH (160) 32 mi88 min 44°F2 ft
44013 - BOSTON 16 NM East of Boston, MA 43 mi64 min WSW 12 G 14 36°F 43°F1003.8 hPa24°F
BHBM3 - 8443970 - Boston, MA 46 mi84 min 39°F1002.1 hPa (-0.5)
44007 - PORTLAND 12 NM Southeast of Portland,ME 49 mi64 min WSW 7.8 G 9.7 30°F 40°F1002.7 hPa21°F

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rochester - Skyhaven Airport, NH24 mi33 minN 010.00 miOvercast25°F20°F81%1002.1 hPa

Link to 5 minute data for KPSM

Wind History from PSM (wind in knots)
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Last 24hrW5NW4W3CalmSW4SW3CalmSW7SW3SW4CalmSW3SW3SW5SW3SW3W3CalmNW3W7NW7NW7NW12N10
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Tide / Current Tables for Gosport Harbor, Isles of Shoals, New Hampshire
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Gosport Harbor
Click for Map
Thu -- 12:32 AM EST     Moonset
Thu -- 05:05 AM EST     7.80 feet High Tide
Thu -- 07:07 AM EST     Sunrise
Thu -- 11:21 AM EST     1.35 feet Low Tide
Thu -- 11:29 AM EST     Moonrise
Thu -- 04:41 PM EST     Sunset
Thu -- 05:34 PM EST     7.18 feet High Tide
Thu -- 11:33 PM EST     1.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.83.14.76.37.47.87.56.54.93.221.41.52.33.65.26.47.17.16.55.23.62.31.6

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Thu -- 12:33 AM EST     Moonset
Thu -- 12:55 AM EST     0.00 knots Slack
Thu -- 02:47 AM EST     0.94 knots Max Flood
Thu -- 06:49 AM EST     -0.00 knots Slack
Thu -- 07:07 AM EST     Sunrise
Thu -- 09:27 AM EST     -1.43 knots Max Ebb
Thu -- 11:29 AM EST     Moonrise
Thu -- 01:36 PM EST     0.00 knots Slack
Thu -- 03:09 PM EST     0.66 knots Max Flood
Thu -- 04:41 PM EST     Sunset
Thu -- 06:54 PM EST     -0.00 knots Slack
Thu -- 09:43 PM EST     -1.44 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.70.10.80.90.70.60.4-0.1-0.9-1.4-1.4-1.2-1-0.40.30.70.50.30.2-0-0.7-1.3-1.4-1.2

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station




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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 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.