Wednesday, December11, 2019
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Marine Weather and Tides
Portsmouth, 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 7:02AMSunset 4:09PM Wednesday December 11, 2019 5:43 AM EST (10:43 UTC) Moonrise 4:58PMMoonset 7:15AM Illumination 100% Phase: Full Moon; Moon at 14 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- 309 Am Est Wed Dec 11 2019
.gale warning in effect from this evening through Thursday morning...
Today..NW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt this afternoon. Seas 4 to 6 ft. Snow, mainly this morning with vsby 1 to 3 nm.
Tonight..W winds 15 to 25 kt, becoming 20 to 25 kt after midnight. Gusts up to 35 kt. Seas 4 to 7 ft.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt, becoming W 5 to 15 kt with gusts up to 20 kt in the afternoon. Seas 4 to 6 ft.
Thu night..SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft.
Fri..S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Fri night..S winds 10 to 15 kt, becoming se 15 to 20 kt after midnight. Seas 2 to 4 ft, building to 4 to 5 ft after midnight. Rain.
Sat..SE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Rain.
Sat night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 6 to 9 ft. Rain.
Sun..W winds 15 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft.
Sun night..W winds 20 to 30 kt with gusts up to 40 kt. Seas 4 to 7 ft.
ANZ100 309 Am Est Wed Dec 11 2019
Synopsis for stonington me to merrimack river ma out to 25 nm.. A cold front will cross the waters early this evening resulting in gales on the ocean waters. Thereafter, a potentially potent low pressure system will approach Friday and will likely affect the waters Saturday. &&


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 110845 AAA AFDGYX

Area Forecast Discussion . UPDATED National Weather Service Gray ME 345 AM EST Wed Dec 11 2019

SYNOPSIS. Today will feature clearing skies but cold temperatures, with highs right around the freezing mark in many areas. An active weather pattern looks to continue this weekend with low pressure moving up the coast delivering a chance of heavy rainfall perhaps with a brief period of mixed precipitation at the start. Windy and cold conditions will likely follow in the wake of the low for Sunday into Monday. Another low pressure system will approach from Monday night and Tuesday and that one may contain more wintry precipitation.

NEAR TERM /UNTIL 6 PM THIS EVENING/. A weak wave of low pressure moving south of the forecast area this morning will continue to spread light snow across southeastern zones through about 14z with around an inch of accumulation expected. Slippery conditions are possible across the forecast area this morning owing to the light snow in southeastern zones or the freezing of the earlier rainfall elsewhere. Otherwise, clearing skies are expected to occur today with cold temperatures, topping out in the mid 20s to lower 30s across the forecast area.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/. A short wave trough approaching late this afternoon in association with a SFC cold front will likely produce enough forcing for snow showers and squalls this evening across northwestern zones this evening, with the best chances being in Grafton and Coos Counties. However, one or two squalls may work east of the mountains by late evening. A period of gusty winds are possible later this evening into the overnight hours in the wake of the cold front.

High pressure will center overhead later Wednesday night and Thursday providing for fair and cold weather.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/. A ribbon of vorticity will lift out of the forecast area Thursday morning, replaced by zonal and eventually SW flow by the weekend. The next system of consequence will begin to move up the eastern seaboard and into the forecast area Saturday morning. This cutter system is progged to stay to our west as it lifts north, bringing predominantly rain to the area as we stay in the warm sector for much of the time.

In the dailies, Thursday night into Friday morning has been trending warmer with each run, and accounting for the forecasted sky cover and not ideal radiational cooling conditions, have raised temps considerably for this time frame. Friday high pressure will be moving east with disturbances to our north and south. Southerly flow will be on the increase with anomalously high PWATS increasing from the south. Friday should be mostly precipitation-free with highs in the lower 30s north to the mid 30s to lower 40s south. Skies will be cloudy as low pressure approaches from the SW.

Saturday temperatures will be on the increase as warmer air moves up ahead of the storm system. At this time it looks like precipitation should break out Friday night in the SW and gradually work its way northeastward. Precipitation will be a brief mix initially. During the day Saturday rain will be most common with snow at just the highest peaks. Some upslope showers will persist Sunday as well. QPF looks to be in the 1-1.5" range, which may cause some problems on area rivers as far as antecedent warmer temperatures combined with runoff.

The storm moves north-northeast Sunday with residual showers in the higher terrain. We have a break briefly as high pressure moves in on Monday, but then the next system arrives from the southwest by Tuesday morning.

AVIATION /09Z WEDNESDAY THROUGH SUNDAY/. Short Term /Through Thursday/ . After some early morning IFR in snow across southernmost NH and coastal ME through 13z this morning, VFR conditions will prevail across the forecast area today. A few snow squalls will be possible in the mountains tonight with gusty W winds there and elsewhere through 08z or so. VFR conditions are expected through Thursday.

Long Term . Another low will track up the eastern seaboard bringing widespread rain to the area Friday into Saturday. MVFR conditions are likely at all terminals, with -SN likely for KLEB and KHIE, and -RA for all other NH and ME terminals.

MARINE. Short Term /Through Thursday/ . A cold front will push across the waters early this evening and likely result in gale force gusts on the ocean waters this evening through tonight. A gale warning has been posted as a result. Winds will be weaker on the bays, so a SCA is in effect there. Diminishing winds and seas are expected Thursday.

Long Term . Another low will move up the eastern seaboard with gales possible in the Gulf of Maine Saturday morning into Monday.

GYX WATCHES/WARNINGS/ADVISORIES. ME . None. NH . None. MARINE . Small Craft Advisory from 10 PM this evening to 7 AM EST Thursday for ANZ151-153. Gale Warning from 10 PM this evening to 7 AM EST Thursday for ANZ150-152-154.



NEAR TERM . Ekster SHORT TERM . Ekster LONG TERM . Hanes


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 3 mi118 min W 6 32°F 1020 hPa32°F
IOSN3 - Isle of Shoals, NH 11 mi43 min WNW 13 G 14 32°F 1019.7 hPa (+2.5)30°F
44030 - Buoy B0102 - Western Maine Shelf 19 mi99 min NW 14 G 18 34°F 5 ft1019.6 hPa
WELM1 - 8419317 - Wells, ME 20 mi73 min W 2.9 G 6 32°F 44°F1019.6 hPa
WEXM1 - Wells Reserve, ME 21 mi103 min S 2.9 33°F 32°F
44098 - Jeffrey's Ledge, NH (160) 37 mi65 min 47°F7 ft
44029 - Buoy A0102 - Mass. Bay/Stellwagen 40 mi99 min NNW 21 G 25 34°F 46°F3 ft1018.7 hPa
44007 - PORTLAND 12 NM Southeast of Portland,ME 45 mi53 min NW 3.9 G 7.8 33°F 46°F5 ft1019.5 hPa (+2.8)31°F
CASM1 - 8418150 - Portland, ME 49 mi73 min 33°F 42°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 mi1.8 hrsWSW 72.00 miLight Snow Fog/Mist32°F30°F95%1019.6 hPa
Rochester - Skyhaven Airport, NH16 mi52 minS 310.00 miOvercast31°F28°F92%1019.1 hPa
Sanford, Sanford Regional Airport, ME22 mi47 minS 39.00 miLight Snow32°F30°F96%1020.3 hPa

Link to 5 minute data for KPSM

Wind History from PSM (wind in knots)
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1 day agoSW4CalmCalmE3CalmCalm--E8SE12S12S12S10S10S10S9S8S7S10S8SW8SW10SW10
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2 days agoW6W3W4CalmSW5S4CalmSW8S7S6S3S6S8S7S9SW6S5SW6SW5S5SW5SW5SW5Calm

Tide / Current Tables for Atlantic Heights, Piscataqua River, New Hampshire
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Atlantic Heights
Click for Map
Wed -- 04:16 AM EST     0.64 feet Low Tide
Wed -- 06:15 AM EST     Moonset
Wed -- 07:04 AM EST     Sunrise
Wed -- 10:38 AM EST     8.17 feet High Tide
Wed -- 03:57 PM EST     Moonrise
Wed -- 04:08 PM EST     Sunset
Wed -- 04:52 PM EST     -0.16 feet Low Tide
Wed -- 11:13 PM EST     7.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.34.72.91.40.70.91.93.55.4788.17.35.73.61.50.2-0.20.41.73.55.36.77.3

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Wed -- 02:16 AM EST     -1.72 knots Max Ebb
Wed -- 06:01 AM EST     0.00 knots Slack
Wed -- 06:14 AM EST     Moonset
Wed -- 07:04 AM EST     Sunrise
Wed -- 08:08 AM EST     1.37 knots Max Flood
Wed -- 11:53 AM EST     -0.00 knots Slack
Wed -- 02:46 PM EST     -2.04 knots Max Ebb
Wed -- 03:57 PM EST     Moonrise
Wed -- 04:07 PM EST     Sunset
Wed -- 06:46 PM EST     0.00 knots Slack
Wed -- 08:37 PM EST     1.11 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-1.2-1.7-1.6-1.3-0.8-00.91.41.20.80.5-0.1-1-1.8-2-1.8-1.4-0.70.211.10.80.5

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 (5,6,7,8)
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Ground Weather Radar Station Portland, ME
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