Friday, July10, 2020
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Marine Weather and Tides
Portsmouth, NH

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 5:12AMSunset 8:24PM Friday July 10, 2020 2:30 PM EDT (18:30 UTC) Moonrise 11:51PMMoonset 10:39AM Illumination 72% Phase: Waning Gibbous; Moon at 20 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- 857 Am Edt Fri Jul 10 2020
Rest of today..SE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby variable to less than one quarter nm, increasing to 1 to 3 nm this afternoon.
Tonight..SE winds 10 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers in the evening, then showers after midnight.
Sat..S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft. Showers in the morning, then showers likely with a chance of tstms in the afternoon.
Sat night..S winds 10 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft. A chance of showers and tstms in the evening.
Sun..S winds 10 to 15 kt. Seas 3 to 5 ft.
Sun night..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 4 to 6 ft.
Mon..SW winds 5 to 10 kt. Seas 3 to 5 ft.
Mon night..SW winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
Tue..SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
Tue night..W winds 5 to 10 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms.
ANZ100 857 Am Edt Fri Jul 10 2020
Synopsis for stonington me to merrimack river ma out to 25 nm.. Remnants of tropical system fay will move to the west tonight and Saturday, bringing seas above 5 ft for the outer waters with gusts to 25 kts likely through the weekend. &&


7 Day Forecast for Marine Location Near Portsmouth, NH
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location: 43.08, -70.77     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 101251 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 851 AM EDT Fri Jul 10 2020

SYNOPSIS. Hot and humid today with a chance of isolated showers or thunderstorms. More widespread showers and thunderstorms will move in tonight through Saturday as the remains of tropical storm move well to our west. An upper level trough will keep the chance of showers and thunderstorms in the forecast into early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 9am . Have dropped the dense fog advisory for the southern coastline where visibilities have started to lift, however have opted to extend it a few hours through the midcoast where satellite trends show very slow progress on the eroding. Do expect the area to finally break into the sun by mid-day.

705 AM . Fog and stratus cover much of the ME coastal plain, as well as parts of SW and central NH. The fog should gradually thin thru the first part of the morning , but will likely take until mid morning for the stratus to break. Any sun will likely be brief in srn NH, with cirrus moving and thickening midday to early afternoon. Max temps were tweaked down a degree or two in srn zones, just to cover the lingering early clouds, and their impact on heating.

Previously . As TS Fay tracks N along the mid Atlantic coast today, weak sfc ridging will hold on in nrn New England thru much of the day. Current fog.stratus in coastal and central ME will likely take until mid morning to dissipate, given the weaker flow, here. Also watching some stratus creep N across MA toward srn NH, which may work its way into srn NH this morning as well. All this affects max temps today, and how quickly, if at all, the stratus clears out. In srn NH, regardless of what happens with stratus, will see cirrus thicken thru the morning, which will limit maxes here, but still will see temps climb into the mid to upper 80s, and heat Apparent T approach 90 given Tds around 70. The warmest spots will likely the CT vly in central NH and up toward KHIE, where highs could make it to 90. Otherwise, highs should reach into the mid 80s inland areas and upper 70s to low 80s along the coast, although cooler right at the shore, which may flirt with low clouds and fog thru much of the day.

Cannot rule out an isolated SHRA/TSRA in the mtns this afternoon, and will probably see a few SHRA/TSRA in srn NH late today as well in advance of Fay.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/. Models continue to push waht's left of Fay further west, with the center moving up the Hudson vly of NY. This will keep the heaviest rain to our west. Still will see several bands of SHRA/TSRA move thru overnight, especially across NH, and there is potential for some torrential downpours. These will become more prevalent across wrn and central ME closer to daybreak. It will be generally mild and muggy night with lows in the mid 60s to low 70s.

Saturday will see the center of Fay moving from around KALB to Montreal. Should see bands of precip associated with it lift N thru the morning. However, 500 mb trough to the west will pulled east as Fay is consumed by it, and will see 500 mb height falls and lowering temps. Depending on how much clearing can occur to help enhance destabilization further, could see some strong to svr storms Sat afternoon, especially over central and srn NH. Highs on Sat range from the low to mid 80s in NH and interior SW Me to low-mid 70s on the mid coast.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/. Quite warm and humid weather expected in the long term. The remains of tropical storm Fay will move into southern Canada Saturday night. A trough will remain to our west keeping us in a very warm and humid airmass scattered showers and thunderstorms are expected through the weekend. A shortwave will move through the area Monday afternoon spreading another round of showers and thunderstorms into the region. Some thunderstorms will have very heavy rain. Both the Euro and GFS indicating that upper level low pressure will remain over the region through Wednesday and possibility into Thursday will will keep the chance of showers and thunderstorms in the area. By Friday the flow aloft becomes zonal.

AVIATION /13Z FRIDAY THROUGH TUESDAY/. Short Term . Any fog/stratus this morning should improve to VFR by mid-morning, with the exception KRKD. Will likely see coastal stratus and fog move back in late today, and most terms will drop to MVFR or IFR tonight in showers associated with remnants of TS Fay. Improvement to VFR is possible Sat afternoon.

Long Term . Saturday night likely MVFR/IFR in showers and thunderstorms and patchy fog. MVFR/IFR possible in showers and thunderstorms each afternoon through Tuesday.

MARINE. Short Term . May need SCA late tonight and Sat.

Long Term . SCA for winds and seas possible Saturday night and Sunday.

HYDROLOGY. With the track of Fay moving west the chance of flash flooding is diminished but not completely ruled out. We will be in a very tropical airmass and with high PW we will have to continue to monitor the situation.

GYX WATCHES/WARNINGS/ADVISORIES. ME . Dense Fog Advisory until 11 AM EDT this morning for MEZ021-022- 025>028. NH . None. MARINE . None.

SYNOPSIS . NEAR TERM . Curtis SHORT TERM . Cempa LONG TERM . Hawley AVIATION . MARINE . HYDROLOGY .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 3 mi45 min SE 4.1 81°F 1017 hPa76°F
CMLN3 4 mi146 min 5.1 76°F
IOSN3 - Isle of Shoals, NH 11 mi30 min ESE 12 G 13 67°F 1016.5 hPa67°F
44073 13 mi86 min E 5.8 G 7.8 71°F 69°F
44030 - Buoy B0102 - Western Maine Shelf 19 mi86 min E 5.8 G 5.8 2 ft1023.1 hPa
WELM1 - 8419317 - Wells, ME 20 mi42 min ESE 4.1 G 6 68°F 66°F1017.6 hPa
WEXM1 - Wells Reserve, ME 21 mi30 min E 5.1 71°F 69°F
44098 - Jeffrey's Ledge, NH (160) 37 mi25 min 67°F2 ft
44029 - Buoy A0102 - Mass. Bay/Stellwagen 40 mi86 min SE 9.7 G 9.7 67°F 2 ft1014.9 hPa
CASM1 - 8418150 - Portland, ME 49 mi42 min 67°F 63°F

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pease Air Force Base / Portsmouth, NH3 mi34 minESE 1010.00 miMostly Cloudy79°F70°F76%1016.8 hPa
Rochester - Skyhaven Airport, NH16 mi39 minSE 810.00 miFair84°F66°F57%1016.1 hPa
Sanford, Sanford Regional Airport, ME22 mi34 minVar 410.00 miFair82°F71°F69%1017.2 hPa

Link to 5 minute data for KPSM

Wind History from PSM (wind in knots)
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Last 24hrE9SE9SE8SE8E5E5E5E3CalmCalmCalmCalmE3CalmSE4SW2CalmCalmSE3E5SE6SE8SE10SE10
1 day agoSW10SW6NW3SE7SW12
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NW4--NE8E6S4CalmCalmCalmCalmCalmCalmCalmCalmNW6CalmE8E7E8E7
2 days agoSE12S12SE14SE14SE10SE12S11S8S5S5S8S8S6S4S3S5S3SW5SW5SW6S7SW9S8SW10

Tide / Current Tables for Atlantic Heights, Piscataqua River, New Hampshire
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Atlantic Heights
Click for Map
Fri -- 03:56 AM EDT     7.83 feet High Tide
Fri -- 05:13 AM EDT     Sunrise
Fri -- 10:10 AM EDT     0.34 feet Low Tide
Fri -- 10:39 AM EDT     Moonset
Fri -- 04:36 PM EDT     7.24 feet High Tide
Fri -- 08:23 PM EDT     Sunset
Fri -- 10:25 PM EDT     1.12 feet Low Tide
Fri -- 11:50 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.14.86.47.57.87.46.14.22.30.90.40.61.63.24.96.37.17.26.553.31.91.21.2

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Fri -- 01:13 AM EDT     1.06 knots Max Flood
Fri -- 04:56 AM EDT     -0.00 knots Slack
Fri -- 05:13 AM EDT     Sunrise
Fri -- 07:51 AM EDT     -1.89 knots Max Ebb
Fri -- 10:39 AM EDT     Moonset
Fri -- 11:54 AM EDT     0.00 knots Slack
Fri -- 01:46 PM EDT     1.03 knots Max Flood
Fri -- 05:44 PM EDT     -0.00 knots Slack
Fri -- 08:16 PM EDT     -1.50 knots Max Ebb
Fri -- 08:22 PM EDT     Sunset
Fri -- 11:50 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.610.90.60.4-0-0.9-1.7-1.9-1.7-1.4-0.80.10.910.80.70.4-0.2-1-1.5-1.4-1.2-0.8

Weather Map
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wmap_A
GEOS Local Image of Northeast    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 Gray/Portland, ME (14,3,4,5)
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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 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.