Wednesday, March20, 2019 L-36.com


Marine Weather and Tides
South Portland, ME

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:42AMSunset 6:54PM Wednesday March 20, 2019 1:37 AM EDT (05:37 UTC) Moonrise 6:31PMMoonset 6:52AM Illumination 99% Phase: Waxing Gibbous; 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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ANZ153 Casco Bay- 1238 Am Edt Wed Mar 20 2019
Tonight..SW winds 5 to 10 kt. Seas 2 to 3 ft.
Thu..S winds 5 to 15 kt, becoming 10 to 15 kt in the afternoon. Seas 2 to 4 ft. A chance of showers in the afternoon.
Thu night..S winds 5 to 10 kt, becoming se after midnight. Seas 2 to 4 ft. Rain.
Fri..NW winds 5 to 10 kt. Seas 4 to 6 ft. Rain.
Fri night..NW winds 10 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft, subsiding to 3 to 5 ft after midnight. A chance of snow showers. Rain in the evening, then a chance of showers after midnight. Vsby 1 to 3 nm.
Sat..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of snow or rain showers in the morning. Vsby 1 to 3 nm.
Sat night..NW winds 10 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Sun..W winds 10 to 15 kt with gusts up to 20 kt. Seas 1 foot or less.
Sun night..W winds 5 to 10 kt. Seas 2 to 3 ft.
Mon..NW winds around 10 kt. Seas 2 to 3 ft.
Mon night..NW winds around 10 kt with gusts up to 20 kt. Seas 1 to 2 ft.
ANZ100 1238 Am Edt Wed Mar 20 2019
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure axis crests over the gulf of maine tonight. A southwest flow begins as the high moves east Wednesday. A cold front approaches from the west on Thursday before stalling. Low pressure will track north along the front near new england on Friday. &&


7 Day Forecast for Marine Location Near South Portland, ME
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location: 43.65, -70.3     debug


Area Discussion for - Gray/Portland, ME
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Fxus61 kgyx 200440
afdgyx
area forecast discussion
national weather service gray me
1240 am edt Wed mar 20 2019

Synopsis
High pressure overhead tonight will provide for fair weather and
cold overnight lows. As it moves offshore tomorrow a southwest
wind will bring warmer air back into the area for Wednesday and
Thursday. A cold front approaches from the west Thursday into
Friday, but it will stall as it arrives into northern new
england. Low pressure developing over the carolinas will track
north along this front and bring precipitation to new england
mainly on Friday. Rain is expected for most locations, but
accumulating snow is possible in the mountains.

Near term until 6 am this morning
Update...

have adjusted temperatures and dew points for current trends.

Rest of the package will remain relatively unchanged.

Prev disc...

920pm update... Not much to change with the
forecast. Temperatures are on track to drop into the teens and
single digits above zero. Winds have shutdown to light and
variable and there is very little if any cloud cover. Will
update to make only very minor tweaks to line up with mesonet
observations.

620pm update... Another clear and calm night in store for us.

With dewpoints relatively low and an absence of cloud cover,
expect most locations to radiate well tonight with temperatures
falling rapidly over the next few hours.

Previous discussion...

high pressure overhead tonight will provide mostly clear
conditions and lead to another good radiational cooling night.

Have once again undercut guidance mins. Otherwise, boundary
layer cumulus across southern zones should dissipate early this
evening.

Short term 6 am this morning through 6 pm Thursday
Southwest flow develops on Wednesday as high pressure moves
offshore. Should see a fine day, even though there could be some
mid clouds from time to time. Highs will be a good 7-12 degrees
higher than today's readings. Mostly clear skies are expected
for a good portion of Wednesday night before clouds increase
from the west late. While low temperatures will not get down to
the levels we will see tonight, there will be ample opportunity
to radiate as the low levels decouple.

Long term Thursday night through Tuesday
Ensemble and deterministic model solutions remain in decent
agreement on the long wave pattern through day ten. Pacific
energy will temporarily break down the upper ridge centered over
the western CONUS early in the period. The ridge will weaken and
gradually translate east into the great lakes and mid atlantic
region by this weekend. The downstream trough initially here in
the east will see phasing of northern and southern stream energy
with developing coastal system paralleling the coast late Thursday
and Friday. Behind this system... The upper trough closed low will
lift out by the second half of the weekend with rising heights
and a more westerly flow proving a brief warm up for Sunday and
Monday. By Tuesday and Wednesday the western CONUS ridge has
reestablished itself with a downstream trough once again here in
the east. In the dailies... A cold front approaches from the great
lakes Thursday while low pressure develops along the carolina
coast. Rain and snow showers should transition to a steadier rain
and snow by Thursday night with the approaching coastal low.

At this point... Thermal profiles suggest largely a rain event for
the coastal plain with a stripe of wet snow further north and west
across the mountains and over the higher terrain. However... P-type
is highly sensitive to slight change in storm track and resultant
thermal profiles... So relatively low confidence in both precipitation
type and potential snow accumulation at this time. In the wake
of this system... Cold cyclonic flow will produce clouds and scattered
snow and rain showers later Friday into Saturday. High pressure
builds by to our south for Sunday and Monday. A backdoor cold
front will likely settle south across the area on Monday. High
pressure and much cooler weather follows for Tuesday and Wednesday.

Aviation 06z Wednesday through Sunday
Short term...VFR conditions with relatively light winds tonight
through Wednesday night.

Long term...

thu... MVFR in -shra -shsn. Southerly wind gusting to 25 kt.

Thu night - fri... Widespread ifr in sn and ra.

Fri night - sat... Sct MVFR in mtn -shsn.

Westerly wind gusting to 25 kt.

Marine
Short term... High pressure crossing the gulf of maine will bring
light winds and seas tonight. A southwest flow develops behind
the high on Wednesday and Wednesday night but conditions should
remain below small craft thresholds.

Long term...

thu - sat... Sca's likely... With gales psb outside the bays.

Sun... Sca's are psb outside the bays.

Tides coastal flooding
Astronomical tides will be quite high Thursday and Friday (over
11 ft mllw at portland) while low pressure affects the region.

Depending on the eventual low track, duration of onshore flow,
and wave heights we may have some coastal flooding on the
southern me coast and the nh seacoast. Likely minor in nature
but will continue to monitor trends.

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
CASM1 - 8418150 - Portland, ME 3 mi55 min 30°F 37°F
44007 - PORTLAND 12 NM Southeast of Portland,ME 12 mi47 min NNE 5.8 G 7.8 34°F 37°F1 ft1029.2 hPa (+0.7)8°F
WEXM1 - Wells Reserve, ME 25 mi97 min NNE 1.9 25°F 9°F
WELM1 - 8419317 - Wells, ME 27 mi49 min WNW 1.9 G 1.9 25°F 38°F1029.7 hPa
44030 - Buoy B0102 - Western Maine Shelf 33 mi93 min NNE 5.8 G 5.8 35°F 38°F1 ft1029 hPa

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Jetport, ME1 mi46 minN 010.00 miFair26°F10°F51%1029.6 hPa

Wind History from PWM (wind in knots)
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Last 24hrW4W3CalmCalmW3W5NW3CalmCalmE5NE4E7S7S9S9SE8SE6E4NW6NW4CalmW4CalmCalm
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Tide / Current Tables for Fore River, Maine
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Fore River
Click for Map
Wed -- 04:58 AM EDT     -1.02 feet Low Tide
Wed -- 06:44 AM EDT     Sunrise
Wed -- 06:51 AM EDT     Moonset
Wed -- 11:14 AM EDT     11.26 feet High Tide
Wed -- 05:30 PM EDT     -1.58 feet Low Tide
Wed -- 06:31 PM EDT     Moonrise
Wed -- 06:53 PM EDT     Sunset
Wed -- 09:43 PM EDT     Full Moon
Wed -- 11:45 PM EDT     10.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.57.44.61.7-0.3-1-0.21.94.97.910.211.210.89.16.22.90.1-1.4-1.40.12.868.710.4

Tide / Current Tables for Cow Island, Maine
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Cow Island
Click for Map
Wed -- 04:56 AM EDT     -1.02 feet Low Tide
Wed -- 06:44 AM EDT     Sunrise
Wed -- 06:50 AM EDT     Moonset
Wed -- 11:11 AM EDT     11.26 feet High Tide
Wed -- 05:28 PM EDT     -1.58 feet Low Tide
Wed -- 06:30 PM EDT     Moonrise
Wed -- 06:52 PM EDT     Sunset
Wed -- 09:43 PM EDT     Full Moon
Wed -- 11:42 PM EDT     10.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.47.34.41.6-0.4-1-0.2258.110.311.210.88.962.70.1-1.4-1.40.22.96.18.810.5

Weather Map and Satellite Images
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wmap_A
GOES 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.
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Wind Forecast for Gray/Portland, ME (1,6,7,8)
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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.