Thursday, November21, 2019 L-36.com


Marine Weather and Tides
Groton, CT

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 6:42AMSunset 4:26PM Thursday November 21, 2019 4:28 PM EST (21:28 UTC) Moonrise 1:32AMMoonset 2:57PM Illumination 28% 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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ANZ330 Long Island Sound East Of New Haven Ct/port Jefferson Ny- 351 Pm Est Thu Nov 21 2019
.gale watch in effect from late tonight through Friday evening...
Tonight..SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt after midnight. Seas 1 ft or less, then around 2 ft after midnight.
Fri..SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 20 to 25 kt with gusts up to 35 kt in the afternoon. Seas 2 to 4 ft. Chance of showers in the afternoon.
Fri night..NW winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 35 kt. Seas 2 to 4 ft.
Sat..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Sat night..SW winds 5 to 10 kt, becoming se after midnight. Seas 1 ft or less. Chance of rain in the evening, then rain after midnight.
Sun..NE winds 10 to 15 kt, becoming nw in the afternoon. Gusts up to 25 kt. Seas 1 ft or less, then 2 to 3 ft in the afternoon. Rain likely.
Sun night..NW winds around 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon..W winds 10 to 15 kt. Seas 2 to 3 ft.
Mon night..W winds 5 to 10 kt. Seas 1 ft or less.
Tue..SW winds 5 to 10 kt. Seas 1 ft or less.
Tue night..S winds 5 to 10 kt. Seas 1 ft or less.
ANZ300 351 Pm Est Thu Nov 21 2019
Synopsis for the long island waters and new york harbor.. High pressure shifts offshore tonight ahead of a cold front that will cross the area on Friday. Brief high pressure then returns for Saturday. Low pressure impacts the region late Saturday night through Sunday. Weak high pressure then builds in for Monday through the middle of next week.


7 Day Forecast for Marine Location Near Groton city, CT
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location: 41.3, -72.08     debug


Area Discussion for - New York City/Upton, NY
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FXUS61 KOKX 212044 AFDOKX

Area Forecast Discussion National Weather Service New York NY 344 PM EST Thu Nov 21 2019

SYNOPSIS. High pressure shifts offshore tonight ahead of a cold front that will cross the area on Friday. Brief high pressure then returns for Saturday. Low pressure impacts the region late Saturday night through Sunday. Weak high pressure then builds in for Monday through the middle of next week. A cold front will move through late Wednesday into Wednesday night.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. Expect the early portion of the night to be influenced by deep layer ridging that will begin to move offshore. Initially, favorable radiational cooling conditions will exist in light winds and mostly clear skies. A non-diurnal trend will then occur as the high moves offshore and a low pressure system approaches from the west, giving way to increasing cloud cover and warm advection as flow becomes more south-southwesterly. Low temperatures will occur early in the night and be close to climatological normals in the upper 30s to mid 40s, before rising a few degrees by daybreak.

SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/. Warm advection will continue into the morning ahead of an approaching low pressure system, but the antecedent dry air mass will initially be slow to saturate. As such, any precipitation will likely be light at onset. Deep layer moisture then quickly increases into the afternoon, coincident with the arrival of the strong short wave aloft. At this time, there appears to be more phasing between the northern and southern stream jets, which should increase upward motion and chances for rain across the area, especially closer to the coast. Expect highs on the mild side, generally in the 50s.

Rain then quickly ends by evening as confluent flow aloft allows a surface high to build into the region. The tightened pressure gradient between the departing system and incoming high pressure will lead to strong and gusty winds across the area, which combined with strong cold advection will yield wind chill values in the 20s overnight. Low temperatures will be well below normal, in the mid 20s to mid 30s.

LONG TERM /SATURDAY THROUGH THURSDAY/. Weak high pressure will move over the region Saturday. Backing profiles during the day will mean cold air advection into the region, with much cooler highs as compared to Friday. Highs will be in the 40s region-wide.

High pressure then shifts offshore Saturday night, with ridging aloft as well as veering profiles. This will mean a nearly steady or slightly warming trend overnight.

A trough over the mid-West will allow a surface low over the Ohio valley to quickly intensify as it approaches the area Saturday night. The track of this low is still very uncertain, but should push offshore or move over the area late Saturday night into Sunday morning, then track into the Gulf of Maine Sunday night. Right now, the NAM is an outlier, with a well offshore track. Also, depending on the track, a period of moderate precipitation is possible. Finally, depending on the track and how much cold air remains at the surface, frozen/freezing precipitation is possible for areas well inland, mainly across the Lower Hudson Valley. Again, there exists large uncertainty at this time.

Weak surface ridging then builds in from high pressure over the Gulf of Mexico Monday, then pushes offshore on Tuesday.

A frontal system approaches for the middle of the week, lifting a warm front north of the area Tuesday night into early Wednesday morning. The associated cold front quickly moves through Wednesday into Wednesday night as the associated low passes well north and east of the area, tracking over the eastern Great Lakes region then into southeastern Canada. Temperatures will be warm enough at this point for all rain everywhere.

AVIATION /20Z THURSDAY THROUGH TUESDAY/. High pressure remains south of the region through tonight. A cold front approaches from the west on Friday, crossing the area Friday afternoon.

Primarily VFR through the TAF period. A brief period of MVFR ceilings in rain is possible on Friday with the frontal passage, but the probability remains too low to include in the TAFs at this time.

Winds will continue to back to the W and then SW into the evening at speeds of 10 kt or less. Light S-SW flow this tonight increases early Friday morning. Sustained winds 10-15 kt with gusts around 20-25 kt become likely at coastal terminals around day break. Winds shift to the NW during the afternoon, with continued gusts to 20-25 kt.

NY Metro Enhanced Aviation Weather Support .

Detailed information, including hourly TAF wind component forecasts, can be found at: http:/www.weather.gov/zny/n90

KJFK TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

KLGA TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

KEWR TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

KTEB TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

KHPN TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

KISP TAF Comments: Timing of wind shifts through this evening may be off by 1-2 hours.

OUTLOOK FOR 18Z FRIDAY THROUGH TUESDAY. Friday. Low chance of MVFR in rain showers, otherwise VFR. SW winds around 15 kt shift to the NW with gusts 20-25 kt in the afternoon and evening. Saturday. VFR. Saturday night. Becoming MVFR to IFR in rain. Wintry mix possible at KSWF. Sunday. Rain with MVFR/IFR, ending during the afternoon. NW winds gusting to around 20 kt in the afternoon. Sunday Night-Tuesday. VFR.

MARINE. Initially light winds and sub-SCA will both gradually increase through the night with the approach of a low pressure system, reaching advisory levels by the morning to early afternoon. As the cold front passes east of the waters on Friday, winds will increase significantly in its wake, allowing for the potential for gale force winds on the eastern waters, with SCA levels elsewhere. Winds then gradually decrease into Friday night as high pressure builds from the west, with seas slowly beginning to subside.

Winds will remain below SCA criteria from Saturday through Sunday morning. Strengthening low pressure will impact the coastal waters on Sunday, with 25 to 30 kt gusts in the afternoon and overnight over the ocean waters. Winds should remain below 25 kt from Monday through Tuesday night.

Waves will continue to diminish Saturday falling below 5 ft by late Saturday morning into the early afternoon. Waves then remain below 5 ft through Sunday morning as high pressure will be in control. Thereafter, waves increase to 5 to 7 ft on the ocean waters through Monday night, diminishing thereafter, as the storm pulls away. Waves of less than 5 ft are expected Monday afternoon, and remain below 5 ft through Tuesday night.

HYDROLOGY. No hydrological concerns are expected through Thursday. Liquid equivalent amounts of 0.50"-075" are forecast from late Saturday into late Sunday as an area of low pressure impacts the region. There is some uncertainty with the amounts depending on the track and intensity of the low.

EQUIPMENT. NYC NOAA Weather Radio Station KWO35 (162.55 MHz) is operating at reduced power until further notice.

OKX WATCHES/WARNINGS/ADVISORIES. CT . None. NY . None. NJ . None. MARINE . Small Craft Advisory from 5 AM Friday to 5 AM EST Saturday for ANZ335-338-345-355. Gale Watch from late tonight through Friday evening for ANZ330- 340-350-353.

SYNOPSIS . MD/JP NEAR TERM . MD SHORT TERM . MD LONG TERM . JP AVIATION . FEB MARINE . MD/JP HYDROLOGY . MD/JP EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 0 mi43 min WSW 7 G 8 49°F 1016.9 hPa32°F
NLNC3 - 8461490 - New London, CT 4 mi58 min W 2.9 G 6 51°F 53°F1018.7 hPa
MTKN6 - 8510560 - Montauk, NY 19 mi58 min 46°F 49°F1019.4 hPa
QPTR1 - 8454049 - Quonset Point, RI 41 mi64 min ESE 1.9 G 2.9 47°F 46°F1018.8 hPa
NWPR1 - 8452660 - Newport, RI 42 mi64 min Calm G 0 51°F 46°F1018.5 hPa
NWHC3 - 8465705 - New Haven, CT 44 mi58 min WNW 7 G 8.9 51°F 47°F1018.2 hPa
NAXR1 - Narragansett Bay Reserve, RI 46 mi103 min E 2.9 47°F 1019 hPa33°F
PRUR1 46 mi58 min 49°F 32°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi58 min ESE 1 G 2.9 47°F 1019.1 hPa
CPTR1 - 8452944 - Conimicut Light, RI 48 mi58 min S 2.9 G 2.9 47°F 48°F1018.7 hPa

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Groton / New London, Groton / New London Airport, CT3 mi32 minSW 510.00 miFair47°F33°F59%1018.8 hPa
Westerly, Westerly State Airport, RI15 mi35 minSW 410.00 miFair50°F30°F48%1019.2 hPa
Montauk, Montauk Airport, NY17 mi94 minW 5 mi49°F33°F55%1019.4 hPa
Chester, Chester Airport, CT23 mi33 minN 010.00 miFair48°F26°F43%1018.6 hPa

Link to 5 minute data for KGON

Wind History from GON (wind in knots)
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Tide / Current Tables for Silver Eel Pond, Fishers Island, N.Y.
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Silver Eel Pond
Click for Map
Thu -- 12:31 AM EST     Moonrise
Thu -- 04:04 AM EST     2.47 feet High Tide
Thu -- 06:43 AM EST     Sunrise
Thu -- 10:47 AM EST     0.29 feet Low Tide
Thu -- 01:56 PM EST     Moonset
Thu -- 04:24 PM EST     Sunset
Thu -- 04:25 PM EST     2.41 feet High Tide
Thu -- 11:09 PM EST     0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.41.92.32.52.321.61.20.80.40.30.61.21.72.12.42.42.11.71.20.80.40.1

Tide / Current Tables for The Race, Long Island Sound, New York Current
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The Race
Click for Map
Thu -- 12:07 AM EST     0.00 knots Slack
Thu -- 12:31 AM EST     Moonrise
Thu -- 03:01 AM EST     2.74 knots Max Flood
Thu -- 06:24 AM EST     -0.00 knots Slack
Thu -- 06:43 AM EST     Sunrise
Thu -- 09:27 AM EST     -3.01 knots Max Ebb
Thu -- 12:44 PM EST     0.00 knots Slack
Thu -- 01:56 PM EST     Moonset
Thu -- 03:32 PM EST     2.63 knots Max Flood
Thu -- 04:24 PM EST     Sunset
Thu -- 06:50 PM EST     -0.00 knots Slack
Thu -- 09:54 PM EST     -3.10 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.21.22.32.72.41.70.6-0.8-2.1-2.9-2.9-2.2-10.41.72.52.621.1-0.2-1.7-2.8-3.1-2.6

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.
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Wind Forecast for New York City/Upton, NY (16,3,4,5)
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Ground Weather Radar Station Boston, MA
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