Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Portsmouth, NH

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:09AMSunset 8:09PM Wednesday May 23, 2018 8:27 PM EDT (00:27 UTC) Moonrise 1:55PMMoonset 2:24AM Illumination 67% 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- 641 Pm Edt Wed May 23 2018
Tonight..N winds 10 to 15 kt with gusts up to 20 kt, becoming ne 5 to 10 kt after midnight. Seas around 2 ft.
Thu..E winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft.
Thu night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Fri..SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Fri night..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers after midnight.
Sat..SW winds 5 to 15 kt, becoming se 5 to 10 kt in the afternoon. Seas 2 to 4 ft. A chance of showers.
Sat night..E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers.
Sun..E winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Sun night..E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. A chance of showers.
Mon..E winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
Mon night..S winds around 5 kt. Seas 3 to 4 ft. A chance of showers.
ANZ100 641 Pm Edt Wed May 23 2018
Synopsis for stonington me to merrimack river ma out to 25 nm.. A cold front will exit the region this evening. A warm front will cross the region late Thursday and Thursday night. A backdoor cold front will move southward across the waters over the weekend. A weak disturbance will cross the region early next week.

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 232232
afdgyx
area forecast discussion
national weather service gray me
632 pm edt Wed may 23 2018

Synopsis
A cold front will exit the region this evening, allowing showers
and thunderstorms across portions of maine to move offshore.

A warm front will approach the region Thursday before crossing
the region Thursday night. This will lead to very warm
conditions on Friday. A backdoor cold front drops into the
region this weekend and will likely provide for some unsettled
weather.

Near term until 6 am Thursday morning
---630pm update---
showers and thunderstorms have now completely fallen apart across
the area. Will update the forecast to remove mention of
precipitation tonight. Also, the winds have now shifted to the
north across the forecast area and much drier air is streaming
in. This should make for a more comfortable airmass over the
next few hours.

Previous discussion
Hrrr continues to have a very good handle on the ongoing
convection. The precipitation will slip off the coast over
the next hour or two and diminish. A northwest breeze will
follow drying conditions out across the region. There is still
the possibility of light patchy fog however in the penobscot
river valley where the heaviest precipitation fell today.

Cold air advection will continue overnight. This will allow for
readings to fall through the 40s with upper 30s likely in the
mountains.

Short term 3 am Thursday morning through Thursday night
On Thursday a warm front will approach the region from the west.

This will cross the region Thursday night with an increasing
gradient and strong warm air advection above the surface during
the overnight hours. The front will be relatively moisture
starved. This system will be the leading edge of much warmer
air to follow for late in the work week.

Long term Friday through Wednesday
A warm westerly flow will send temperatures soaring on Friday as
high pressure remains south of the region. Expect most of the
region to range through the 80s and will even approach 90 in far
southern new hampshire. A back door cold front will bring
increasing clouds and a chance of late day showers into far
northeast zones but the remainder of the forecast area will see
a dry day.

Cold front will sag south into northern zones Friday night and
will be the focus for continued shower activity in central and
northern sections of maine and new hampshire. Lows overnight
will range from the mid 50s north to the mid 60s south.

Cold front will continue to push south through the region on
Saturday and will end up stalled over southern new england by
late in the day. Looking for occasional showers and perhaps an
afternoon thunderstorm in southern zones. Highs will range from
the upper 60s to mid 70s north and will range through the 80s in
the south.

High pressure building in from the northeast Saturday night
will set up an increasing onshore flow bringing ocean stratus
into southern new hampshire and southwest maine. Looking for
occasional showers with lows in the mid 40s to mid 50s.

Although the Sun angle is reaching its highest point
considerable high and mid level clouds may prevent this low
level moisture from burning off in inland locations on Sunday.

Occasional showers will again dampen the holiday weekend. Highs
will generally remain in the 50s across western maine and lower
to mid 60s in new hampshire.

Low level moisture will invade most of the forecast area Sunday
night and Monday along will a continuing chance of showers. Weak
shortwave moving in from the west on Monday will enhance shower
activity across the region. Highs on Monday will range from the
upper 50s to upper 60s. A weak cold front behind the departing
shortwave will push south into northern zones Monday night and
will continue south and offshore by early afternoon on Tuesday
bringing sunshine and warmer temps back into the region.

Aviation 00z Thursday through Monday
Short term...VFR conditions expected tonight through Thursday
night. However, there will be some patchy inland valley fog over
eastern areas tonight with localized MVFR or ifr conditions
along and near the penobscot river valley.

Long term...

vfr Friday and Saturday. Areas of ifr lifr ceilings developing
in southern zones Saturday night and Sunday. Widespread ifr lifr
ceilings developing Sunday night and persisting through Monday
night.

Marine
Short term... Winds will be relatively light tonight and
Thursday. However, the gradient will increase with the passage
of a warm front Thursday night. Winds will likely exceed sca
thresholds at that time.

Long term...

sca's likely on Friday.

Fire weather
On Thursday, rh values will fall into the 20 to 25% range across
most of the area away from the coast. Occasionally gusty winds
will create an elevated fire danger.

Friday will see gusty west to northwesterly flow around 25 kt.

These winds will help to mix down dry air from aloft with rh
dropping to around 30 to 40% across southern new hampshire and
possibly portions of southwestern maine. This will put southern
nh near red flag criteria and will need to be watched for
possible fire wx headlines.

Gyx watches warnings advisories
Me... None.

Nh... None.

Marine... None.

Pohl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BGXN3 - Great Bay Reserve, NH 3 mi103 min NW 4.1 78°F 47°F
IOSN3 - Isle of Shoals, NH 11 mi28 min NNE 14 G 16 69°F 1011.5 hPa (+2.6)50°F
44030 - Buoy B0102 - Western Maine Shelf 19 mi84 min SE 1.9 G 1.9 60°F 55°F2 ft1009.3 hPa
WELM1 - 8419317 - Wells, ME 20 mi40 min NE 8 G 11 71°F 49°F1012.5 hPa
WEXM1 - Wells Reserve, ME 21 mi88 min N 6 75°F 49°F
44098 - Jeffrey's Ledge, NH (160) 37 mi82 min 54°F2 ft
44029 - Buoy A0102 - Mass. Bay/Stellwagen 40 mi84 min 58°F 54°F2 ft1008.8 hPa
44007 - PORTLAND 12 NM Southeast of Portland,ME 45 mi38 min NE 14 G 16 56°F 52°F2 ft1012.5 hPa (+3.3)53°F
CASM1 - 8418150 - Portland, ME 49 mi40 min 59°F 49°F1013.2 hPa

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pease Air Force Base / Portsmouth, NH3 mi92 minNNW 13 G 2310.00 miMostly Cloudy78°F42°F28%1010.3 hPa
Rochester - Skyhaven Airport, NH16 mi37 minNW 1010.00 miPartly Cloudy73°F46°F38%1011.9 hPa
Sanford, Sanford Regional Airport, ME22 mi32 minN 810.00 miA Few Clouds73°F46°F40%1012.9 hPa

Wind History from PSM (wind in knots)
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Last 24hrS6S5S6S6S6S3CalmSW3CalmSW5SW5W5NW6N6W5SW4W6NW6NW9W13NW14
G19
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G23
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1 day agoW3W3W5W3W4CalmW4CalmW3W3CalmN3S4SE5SE6S5CalmCalmCalmE3E3SE5SE8S3
2 days agoW6W7NW4W5CalmW3CalmW4CalmW3W3W4NW6S5SW5SW7W9W7
G15
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W10W6W6W4

Tide / Current Tables for Atlantic Heights, Piscataqua River, New Hampshire
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Atlantic Heights
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Wed -- 12:48 AM EDT     0.60 feet Low Tide
Wed -- 02:24 AM EDT     Moonset
Wed -- 05:12 AM EDT     Sunrise
Wed -- 07:12 AM EDT     7.98 feet High Tide
Wed -- 01:24 PM EDT     0.02 feet Low Tide
Wed -- 01:54 PM EDT     Moonrise
Wed -- 07:57 PM EDT     7.90 feet High Tide
Wed -- 08:07 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.61.22.64.46.27.487.76.54.62.60.90.10.21.12.84.76.47.57.97.464

Tide / Current Tables for Portsmouth Harbor Entrance, New Hampshire Current
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Portsmouth Harbor Entrance
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Wed -- 02:24 AM EDT     Moonset
Wed -- 02:27 AM EDT     0.00 knots Slack
Wed -- 04:21 AM EDT     1.11 knots Max Flood
Wed -- 05:12 AM EDT     Sunrise
Wed -- 08:11 AM EDT     -0.00 knots Slack
Wed -- 11:02 AM EDT     -1.98 knots Max Ebb
Wed -- 01:54 PM EDT     Moonrise
Wed -- 02:59 PM EDT     0.00 knots Slack
Wed -- 04:59 PM EDT     1.19 knots Max Flood
Wed -- 08:07 PM EDT     Sunset
Wed -- 08:59 PM EDT     -0.00 knots Slack
Wed -- 11:42 PM EDT     -1.74 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.5-1.2-0.40.51.110.80.60.1-0.8-1.7-2-1.8-1.6-100.91.21.110.8-0-1-1.6

Weather Map and Satellite Images
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wmap_A
GOES 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.
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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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Disclaimer:
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 numerious 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.