Saturday, September19, 2020
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Marine Weather and Tides
Rochester, 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 6:27AMSunset 6:47PM Saturday September 19, 2020 3:14 PM EDT (19:14 UTC) Moonrise 8:57AMMoonset 8:22PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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- 258 Pm Edt Sat Sep 19 2020
.small craft advisory in effect from 2 am edt Sunday through late Sunday night...
Tonight..N winds 5 to 10 kt, increasing to 10 to 15 kt late this evening and overnight. Gusts up to 25 kt. Seas 3 to 5 ft.
Sun..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft.
Sun night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 7 ft.
Mon..NE winds 10 to 15 kt, becoming 5 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 5 to 7 ft.
Mon night..NE winds 5 to 10 kt, becoming N 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 5 to 7 ft.
Tue..N winds 15 to 20 kt with gusts up to 30 kt. Seas 6 to 9 ft, building to 8 to 11 ft in the afternoon.
Tue night..NW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 9 to 12 ft.
Wed..NW winds 10 to 15 kt. Seas 5 to 8 ft, subsiding to 4 to 6 ft in the afternoon.
Wed night..NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
Thu..W winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to 3 ft.
Thu night..SW winds around 10 kt. Seas 2 to 3 ft.
ANZ100 258 Pm Edt Sat Sep 19 2020
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure slowly builds in from the west through tonight and will crest over the waters on Sunday. Tropical system teddy will move north toward nova scotia and bring large swells and gusty winds to the waters by early next week. Seas will be most rough on Tuesday before gradually improving mid to late week as the system exits.


7 Day Forecast for Marine Location Near Rochester, NH
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location: 43.24, -71.1     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 191646 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 1246 PM EDT Sat Sep 19 2020

SYNOPSIS. Seasonably cool and tranquil weather through Monday under high pressure. Hurricane Teddy will remain well offshore Monday before passing east of our region and reaching Nova Scotia on Tuesday. High pressure will follow for Wednesday and Thursday.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 1132 AM Update . Have updated the forecast based on latest conditions and mesoscale model information. Northerly winds continue to gradually increase, gusting to 20 kts at times in some areas.

Full sunshine this afternoon, however temperatures will only top out in the 50s in the north with lower 60s in the south.

Minor adjustment made to winds and temperatures as well as dew points for this afternoon.

655 AM . With the sun for a half hour more, expecting the frost to begin dissipating, and temps to start rising, so have dropped the headlines. Otherwise, no changes to the forecast, with a sunny but cool day in store for the entire CWA.

Previously . Based on 06-07Z obs, only the sheltered areas have decoupled, and most of the places that are currently below or close to freezing are limited to these areas or in zones that have already seen freezing temps yesterday or earlier this week. Will not change headlines, as there are some areas that will see frost this morning, but frost will be more common tonight, and may need advisories everywhere but the immediate coast.

For the rest of today look for sunny skies, with a persistent but lighter N wind than Friday. I went with max temps a little abv guidance given that they were several degrees abv guidance yesterday, even in the face of decent CAA. The downslope helped and winds will be lighter today, so highs expected in the mid 50s N to the low to mid 60s in the S.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/. As mentioned earlier, tonight will be the clear and calmest night, with very dry air in place, rad cooling should be in full force and lows will range from 25-30 in the mtns to the low-mid 30s in the foothills and the inland coastal plain, with upper 30s to around 40 on the coast. So, again freeze or frost products will likely be needed in all but coastal zones, and perhaps the more urban areas of srn NH.

Sunday will be quite similar to Saturday, although with lighter winds. Highs will once again run from the mid 50s N to the low to mid 60s S.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/. Another cold night is expected Sunday night with high pressure centered overhead. High pressure remains in control Monday and then elongates shifting westward Tuesday as Hurricane Teddy moves toward Nova Scotia. Chances remain low from seeing much if any rainfall from Teddy as the system is projected to be too far to the east with breezy northerly winds expected as well as high surf. High pressure builds back into the area midweek followed by potential unsettled weather towards weeks end.

High pressure will crest over the region Sunday night allowing for good radiational cooling with clear skies and light winds. Have gone with MOS guidance which brings low temperatures into the low to mid 30s for most and frost potential expanding to areas near the coast. Temperatures will rebound into the 60s Monday under clear skies. Clouds will increase Monday night from the northwest fringe of Teddy as the system tracks well offshore towards Nova Scotia.

The 00Z deterministic and ensemble guidance remain in good agreement with the track of Teddy remaining too far to our east to bring much in the way of rain to the area. Expect increasing clouds from east to west Tuesday with north to northwesterly winds increasing to 15 to 25 mph. With the ongoing dry conditions the increasing winds will bring elevated fire concerns to areas not receiving any rain. At this point the best chances for rain remain over far eastern zones, although chances here are only near 30 percent. High surf remains to be the primary impact with this system as well as some possible beach erosion and splash-over as we exit a period of high astronomical tides.

High pressure builds in Wednesday and Thursday with temperatures warming back into the 70s for most. Models diverge at the end of next week with some pointing to increasing chances of precipitation with an upper trough approaching Friday.

AVIATION /18Z SATURDAY THROUGH THURSDAY/. Short Term . Mainly VFR, although some vly fog is possible at KHIE/KLEB early this AM and again tonight.

Long Term . Mainly VFR conditions, however there will may localized IFR conditions in patchy ground fog late Sunday night. Gusty winds may develop Tuesday and Tuesday night around the periphery of departing Hurricane Teddy.

MARINE. Short Term . Will see a brief break from SCA conds this afternoon into early evening, but will likely need to hoist another SCA later tonight, which may be needed into early next week due to swell from Teddy.

Long Term . Elevated seas will continue to build as Sunday night as Teddy tracks well offshore towards Nova Scotia. Northeasterly winds will gust to 20-25 kts at times Sunday night into Monday and will shift northerly Monday night into Tuesday with gusts to 30 kts. Seas will peak Tuesday night and will subside Wednesday as well as wind gusts relaxing by Wednesday morning.

FIRE WEATHER. RH values will be in the 20 to 25 percent range today in some spots with a north wind at 10 mph with gusts nearing 20 mph in some locations at times. Have issued a Special Weather Statement for elevated fire weather conditions for today.

TIDES/COASTAL FLOODING. High astronomical tides will continue through early next week. Today's high tide at 100 pm is forecast to be within 0.4 ft of flood stage, which may result in some minor splash-over. High astronomical tides will trend downwards through the weekend while seas will build Sunday night into Tuesday night in response to Teddy tracking offshore towards Nova Scotia. Increasing long period swell from Teddy will bring the potential for some beach erosion and splash-over with the peak in wave action expected Tuesday night.

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

JC


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 19 mi89 min NW 2.9 63°F 1026 hPa30°F
CMLN3 24 mi190 min NW 14 57°F
WELM1 - 8419317 - Wells, ME 29 mi56 min 58°F 56°F1025.7 hPa
IOSN3 - Isle of Shoals, NH 32 mi74 min ENE 7 G 8.9 55°F 1025.5 hPa (-0.7)29°F
44073 33 mi130 min NE 7.8 G 9.7 56°F 60°F
44030 - Buoy B0102 - Western Maine Shelf 36 mi130 min NNE 3.9 G 7.8 55°F 62°F4 ft

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rochester - Skyhaven Airport, NH10 mi23 minNW 610.00 miFair62°F24°F23%1025.1 hPa
Pease Air Force Base / Portsmouth, NH18 mi18 minENE 510.00 miFair62°F19°F19%1025.3 hPa
Concord Municipal Airport, NH21 mi23 minNNW 1110.00 miFair62°F24°F23%1026 hPa
Sanford, Sanford Regional Airport, ME24 mi18 minNW 810.00 miFair61°F27°F27%1025.8 hPa

Link to 5 minute data for KDAW

Wind History from DAW (wind in knots)
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Last 24hrN56CalmCalmN5NW8N10N8N10N7N9NW8NW7NW6NW3NW7NW7N66NE7
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1 day agoN6NW10N7N5N4N4N6N3N8N6N6N6N6N8NE6N6N6N7N7N8N7N7N7NW6
2 days ago5S854433S43S3S3CalmCalmCalmCalmCalmCalmCalm36NW53CalmNW8

Tide / Current Tables for Salmon Falls River entrance, Piscataqua River, New Hampshire
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Salmon Falls River entrance
Click for Map
Sat -- 02:14 AM EDT     8.42 feet High Tide
Sat -- 06:27 AM EDT     Sunrise
Sat -- 08:41 AM EDT     -0.98 feet Low Tide
Sat -- 08:57 AM EDT     Moonrise
Sat -- 02:38 PM EDT     8.43 feet High Tide
Sat -- 06:45 PM EDT     Sunset
Sat -- 08:21 PM EDT     Moonset
Sat -- 09:08 PM EDT     -1.10 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.67.58.48.16.94.92.60.5-0.7-0.90.12.14.66.88.28.47.55.83.61.3-0.4-1.1-0.61

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
Click for Map
Sat -- 02:22 AM EDT     -0.00 knots Slack
Sat -- 05:20 AM EDT     -2.50 knots Max Ebb
Sat -- 06:27 AM EDT     Sunrise
Sat -- 08:56 AM EDT     Moonrise
Sat -- 09:01 AM EDT     0.00 knots Slack
Sat -- 11:18 AM EDT     1.86 knots Max Flood
Sat -- 02:52 PM EDT     -0.00 knots Slack
Sat -- 05:46 PM EDT     -2.46 knots Max Ebb
Sat -- 06:44 PM EDT     Sunset
Sat -- 08:20 PM EDT     Moonset
Sat -- 09:28 PM EDT     0.00 knots Slack
Sat -- 11:41 PM EDT     1.77 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.90.3-0.7-1.8-2.5-2.4-1.8-1.1-01.21.81.71.20.7-0.1-1.3-2.2-2.4-2.1-1.4-0.50.61.6

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 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.