Wednesday, August12, 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 5:44AMSunset 7:51PM Wednesday August 12, 2020 8:10 PM EDT (00:10 UTC) Moonrise 12:00AMMoonset 2:32PM Illumination 34% Phase: Waning Crescent; Moon at 24 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- 642 Pm Edt Wed Aug 12 2020
Tonight..S winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft.
Thu..N winds around 5 kt, becoming se in the afternoon. Seas around 2 ft.
Thu night..S winds around 5 kt, becoming nw after midnight. Seas around 2 ft.
Fri..NE winds 5 to 10 kt. Seas around 2 ft.
Fri night..NE winds 5 to 10 kt. Seas around 2 ft.
Sat..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Sat night..E winds 5 to 10 kt, becoming N after midnight. Seas 3 to 5 ft.
Sun..NE winds 5 to 10 kt, becoming E in the afternoon. Seas 4 to 5 ft.
Sun night..S winds 5 to 10 kt. Seas 4 to 6 ft, building to 5 to 8 ft after midnight.
Mon..S winds 5 to 10 kt. Seas 6 to 9 ft, building to 8 to 9 ft in the afternoon.
Mon night..S winds 5 to 10 kt. Seas 5 to 8 ft. Scattered showers.
ANZ100 642 Pm Edt Wed Aug 12 2020
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure is expected to build over the waters through the rest of the week. Weak pressure gradients will mean light winds but sea breezes forming during the afternoons. &&


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 122250 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 650 PM EDT Wed Aug 12 2020

SYNOPSIS. Slightly cooler and drier air follows in the wake of a cold front for the remainder of the work week. High pressure in the Canadian Maritimes will allow for relatively dry and seasonable temperatures over the weekend. A slow moving frontal system could bring widespread precipitation early next week.

NEAR TERM /UNTIL 6 AM THURSDAY MORNING/. 645 PM . Did manage to squeeze out a sprinkle or two near Portland late this afternoon on sea breeze boundary, but should be dry from this point onward as daytime heating wanes, and drier air continues to move in. Some thin cirrus will cross the srn zones overnight, but otherwise should be clear with light winds. The remnant front tour S will prevent the direst air from making it to the coast, but it will be more comfortable than night, while rad cooling in the mtns should allow for mid- upper 50s as lows, while the south will be mostly in the low-mid 60s.


Previously . Strongest convergence locally is occurring along the sea breeze front . which is tight to the coast in NWly flow. Still carrying some isolated showers in the forecast along this convergence zone . but otherwise dry this evening and overnight.

Drier air is starting to mix down . with lots of low 60s and some upper 50s dewpoints starting to show up. Coolest temps are expected across the Nrn valleys tonight . with the coastal zones the last to see temps get more comfortable overnight.

SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/. Really quiet wx Thu and Thu night. One more day of very warm temps . with readings approaching 90 degrees in the usual hot spots. Weak pressure gradient will lead to stronger sea breezes . and some relief for coastal locations. Overnight will feature good conditions for radiational cooling . and some valley fog may result on night two of the drier air being in place.

LONG TERM /FRIDAY THROUGH WEDNESDAY/. Overview: The long term continues to look rather quiet, at least as far as impactful weather is concerned. Above normal temperatures on Friday will give way to near normal temperatures for the weekend and early next week. The only significant precipitation in the forecast is for Monday and Tuesday as a slow moving frontal system is expected to push through New England.

Impacts: No impactful weather expected.

Forecast Details: Friday begins with an upper level trough stretching south into New England and with our region on the southern edge of high pressure centered over Quebec. These two features will keep things mostly quiet here through Saturday with the exception of some isolated showers in southern NH on Friday and in the northern mountains of NH and western ME on Saturday.

An upper level ridge moves in late Saturday into Sunday but is quickly pushed east as an upper level trough pushes south from Canada. Could see some isolated showers Sunday afternoon over western areas of the region, but the most significant precipitation chances look to come early next week as a slow moving frontal system associated with the upper trough pushes east through New England and scattered showers and thunderstorms will be possible Monday and Tuesday as it does so.

As far as temperatures, Friday looks like the only day with above normal temperatures as the combination of the nearby high pressure and then the upper trough work to keep temperatures near normal through the rest of the period.

AVIATION /00Z THURSDAY THROUGH MONDAY/. Short Term . Widespread VFR conditions expected thru Thu night. Some valley fog possible in the CT River Valley Thu night. Local LIFR conditions possible at LEB and HIE.

Long Term . Generally VFR conditions expected in the long term. Brief restrictions to MVFR/IFR possible in SHRA/TSRA at LEB/CON/MHT on Friday, but the best chances for widespread restrictions will be at all terminals on Monday and Tuesday as a slow moving frontal system affects the region. Winds will generally remain below 10 kt.

MARINE. Short Term . Winds and seas are expected to be below SCA thresholds with high pressure building over the waters. Onshore winds are expected in sea breezes during the afternoon.

Long Term . Winds may become gusty to 20 kt at times from the northeast over the outer waters Saturday and Sunday. May also briefly see seas rise to 5 ft over the outer waters Saturday morning before diminishing and building above 5 ft over the outer waters and parts of Casco Bay Sunday through Tuesday.

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

SYNOPSIS . NEAR TERM . Cempa/Legro SHORT TERM . Legro LONG TERM . Watson AVIATION . Legro/Watson MARINE . Legro/Watson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 3 mi85 min W 1 88°F 1015 hPa72°F
CMLN3 4 mi186 min S 6 79°F
IOSN3 - Isle of Shoals, NH 11 mi70 min S 13 G 14 74°F 1015 hPa (+0.7)74°F
44073 13 mi126 min S 9.7 G 9.7 73°F 66°F
44030 - Buoy B0102 - Western Maine Shelf 19 mi126 min SE 5.8 G 5.8 2 ft
WELM1 - 8419317 - Wells, ME 20 mi52 min ENE 4.1 G 6 72°F 64°F1016.2 hPa
WEXM1 - Wells Reserve, ME 21 mi70 min E 1.9 73°F 69°F
44098 - Jeffrey's Ledge, NH (160) 37 mi65 min 68°F1 ft
44029 - Buoy A0102 - Mass. Bay/Stellwagen 40 mi126 min S 7.8 G 9.7 73°F 1 ft1013.1 hPa
44007 - PORTLAND 12 NM Southeast of Portland,ME 45 mi80 min SSW 7.8 G 7.8 71°F 67°F1 ft1015.3 hPa (+0.7)
CASM1 - 8418150 - Portland, ME 49 mi52 min 78°F 62°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 mi74 minWNW 410.00 miPartly Cloudy88°F57°F36%1015.1 hPa
Rochester - Skyhaven Airport, NH16 mi19 minWNW 410.00 miFair83°F62°F49%1015.8 hPa
Sanford, Sanford Regional Airport, ME22 mi14 minN 010.00 miFair76°F69°F79%1016.7 hPa

Link to 5 minute data for KPSM

Wind History from PSM (wind in knots)
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Last 24hrSE6S6SW8SW9SW6S5S7SW8SW6SW6SW4SW5W6W7W7SW8SW7SW5W6W7W5NW6W3W4
1 day agoSE3CalmSE4CalmCalmW4W5W5CalmW4W4W6W6W5SW4S6SW5E7E8N4S11SE12S10SE7
2 days agoS5SE5SW6CalmSW4SW5W3SW4SW4SW5W6W5W6W6SW8W5SW4W4W7SE7SE10SE9SE4E4

Tide / Current Tables for Atlantic Heights, Piscataqua River, New Hampshire
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Atlantic Heights
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Wed -- 12:12 AM EDT     1.27 feet Low Tide
Wed -- 05:46 AM EDT     Sunrise
Wed -- 06:32 AM EDT     6.47 feet High Tide
Wed -- 12:22 PM EDT     1.51 feet Low Tide
Wed -- 02:31 PM EDT     Moonset
Wed -- 06:50 PM EDT     7.09 feet High Tide
Wed -- 07:49 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.52.23.34.75.86.46.45.84.73.32.21.61.62.33.44.86.16.97.16.75.74.22.7

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Wed -- 02:16 AM EDT     0.00 knots Slack
Wed -- 03:54 AM EDT     0.74 knots Max Flood
Wed -- 05:45 AM EDT     Sunrise
Wed -- 07:17 AM EDT     -0.00 knots Slack
Wed -- 10:24 AM EDT     -1.44 knots Max Ebb
Wed -- 02:23 PM EDT     0.00 knots Slack
Wed -- 02:31 PM EDT     Moonset
Wed -- 04:19 PM EDT     0.98 knots Max Flood
Wed -- 07:48 PM EDT     Sunset
Wed -- 08:09 PM EDT     -0.00 knots Slack
Wed -- 10:59 PM EDT     -1.50 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-0.8-0.20.50.70.50.20.1-0.3-0.9-1.4-1.4-1.1-0.7-0.30.50.90.90.50.30.1-0.5-1.2-1.5

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
Wind Forecast for Gray/Portland, ME (20,4,5,8)
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Ground Weather Radar Station Portland, ME
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weather_mapweather_map weather_map

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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.