Marine Weather and Tide Forecast for Portsmouth, NH
May 2, 2024 4:54 AM EDT (08:54 UTC) Change Location
 | Sunrise 5:32 AM Sunset 7:47 PM Moonrise 2:58 AM Moonset 1:08 PM |
ANZ154 Coastal Waters From Cape Elizabeth, Me To Merrimack River, Ma Out 25 Nm- 317 Am Edt Thu May 2 2024
Today - S winds 10 to 15 kt with gusts up to 20 kt, becoming se with gusts up to 20 kt late. Seas 2 to 3 ft. Wave detail: se 2 ft at 4 seconds. Showers, mainly this morning. Vsby 1 nm or less early this morning.
Tonight - NE winds around 10 kt. Seas 2 to 3 ft. Wave detail: se 2 ft at 4 seconds. Scattered showers in the evening with vsby 1 nm or less.
Fri - NE winds 5 to 10 kt, becoming se in the afternoon. Seas around 2 ft. Wave detail: E 2 ft at 4 seconds.
Fri night - S winds around 5 kt, becoming ne after midnight. Seas around 2 ft. Wave detail: E 2 ft at 5 seconds.
Sat - E winds 5 to 10 kt. Seas around 2 ft. Wave detail: E 2 ft at 5 seconds.
Sat night - SE winds 5 to 10 kt. Seas around 2 ft. Wave detail: E 2 ft at 5 seconds.
Sun - S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. A chance of showers in the afternoon.
Sun night - S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers.
Mon - SW winds around 10 kt. Seas 3 to 4 ft. A chance of showers in the morning.
Mon night - SW winds around 10 kt, becoming W after midnight. Seas around 3 ft.
ANZ100 317 Am Edt Thu May 2 2024
Synopsis for stonington me to merrimack river ma out to 25 nm weak low pressure dives southwest of the gulf of maine today with rain showers as a strong area of high pressure builds over northeastern canada this high pressure circulation gradually builds south through the maritimes and into the gulf of maine this weekend, resulting in ne flow late in the week turning se late Saturday into Sunday. This flow regime may introduce fog on Sunday, while an approaching cold front will bring increasing chances for rain showers. The front crosses the waters Sunday night into Monday with fresh sw to W flow developing.
Area Discussion for - Gray/Portland, ME
(hide/show) HelpNOTE: mouseover dotted underlined text for definition
FXUS61 KGYX 020742 AFDGYX
Area Forecast Discussion National Weather Service Gray ME 342 AM EDT Thu May 2 2024
SYNOPSIS
Warm conditions in southwest New Hampshire will sharply contrast cool, low overcast conditions elsewhere today. Rain showers are possible anywhere, but will generally be most likely and most frequent over central
northern
and eastern areas.
Drier weather returns Friday into Saturday, however the pattern remains unsettled and humid with increasing clouds and more showers late in the weekend. The upcoming work week starts on a drying, clearing, and warming trend.
NEAR TERM /TODAY/
Impacts: *No significant weather impacts expected
Some convection is rolling over the ridge early this morning and is just about at the Vermont-New Hampshire border at the time of this writing. RAP13 analysis shows it is out running the shortwave that providing the forcing, however even though its weakening, cloud tops are still cool so some isolated thunder is still possible predawn in New Hampshire. At the very least this will serve as the first round of showers today.
Otherwise a band of clouds associated with the warm front aloft persists across the area with more forming upstream. These will hamper warming today for Maine and Eastern New Hampshire with highs expected to cap out in the low to mid 50s. The exception will be in western and southern New Hampshire where, when the surface warm front arrives, skies likely clear enough to allow temperatures into the upper 60s and low 70s. How far into the state this penetrates will be a question, but it looks like it could make it to at least Concord before temperatures sharply drop off. Positive theta-E along the warm front will also provide some instability for thunderstorms to develop. SPC mesoanalysis suggests 700-500mb lapse rates across central New Hampshire this afternoon will be in the 6-7C/km range. Rain showers will cross central Maine as well, but with the much cooler temperatures these will not have a threat of lightning.
SHORT TERM /TONIGHT THROUGH FRIDAY/
Impacts: * No significant weather impacts expected
All showers will taper off quickly heading into the night as a 500 mb ridge begins to build into the area. This subsidence following the rain will likely result in patchy fog in the usual valley locations. Skies will start to clear from north to south, but only partly, so would expect most of the area to see lows in the 40s with some upper 30s north of the mountains where the most clearing will be realized the most.
Skies will remain partly cloudy through the day Friday, but with surface high pressure and a 500mb ridge continuing to build in we will remain dry with highs in the upper 50s to mid 60s.
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/
Anomalously high heights will persist over the Northeast through the duration of the extended forecast period... which will allow an anomalously warm airmass to build into the mid- levels. In spite of this, it is still very much Spring in New England, and surface flow relative to the Gulf of Maine will ultimately call the shots regarding the sensible weather conditions. High pressure initially sits offshore this weekend, which keeps conditions humid and cooler than average. A cold front crosses late in the weekend with rain showers, with offshore flow in its wake bringing fresh flow out of the west or northwest into New England with warmer, drier air and sunnier skies. The weather pattern remains active however with another chance for rain around the the middle or latter part of next week.
Starting Friday night... surface high pressure centered over Labrador builds south along the Eastern Seaboard, re-centering to near Nova Scotia by Sunday. At the same time, low pressure near Hudson Bay slowly drifts east... bringing a slow-moving cold front into the Northeast. Resultant northeasterly-turning- southeasterly flow over our forecast area brings a steadily moistening column over the weekend, leading to increasing clouds and eventually rain showers late Saturday through Sunday.
Temperatures on Saturday will vary depending on proximity to the coastline, with 60s over the interior of New Hampshire but 50s more likely in Maine and toward the Seacoast... and the immediate coastline sticking closer to SSTs in the 40s.
Thickening cloud decks and continued onshore flow produces a fairly dreary Sunday with temperatures in the 40s and 50s and rain showers. Forcing doesn't look great, with the parent circulation well north of the region; ensembles bring on average 0.25-0.4" of rain however would expect higher and lower amounts, with an inch or so on the high end given decent moisture depth and some areas possibly staying dry. Instability doesn't appear to be a major factor at this time.
The cold front crosses late Sunday into Monday, with showers ending by the end of the day Monday... though cyclonic flow and slowed frontal movement may delay improvement. Drier flow out of the west will allow for stronger mixing with minimal maritime influence, in turn allowing temperatures to warm strongly into the 70s... except the 60s along the coast where a weak onshore component persists, and across the north where clouds and some showers likely hang around. Tuesday sees a similar fate with highs again in the 60s and 70s and a sunnier mix of clouds and sun.
The next wave moving through the upper level pattern approaches New England by the middle of the week with flow again turning southerly to onshore
Thus, can expect cloudier
more humid...
and likely cooler and showery weather to make a return sometime in the middle or end of next week.
AVIATION /07Z THURSDAY THROUGH MONDAY/
Short Term...A mix of IFR and MVFR ceilings are whats out there this morning with some light rain and fog. The fog will dissipate later this morning but low ceilings in light rain showers will persist through today. Thunderstorms may form and move through central New Hampshire this afternoon briefly impacting KCON and KMHT. Patchy fog may continue localized IFR at the valley terminals Thursday night into early Friday morning, otherwise Friday will see mostly VFR conditions.
Long Term...VFR prevails Sat with flow generally out of the E AOB 15 kts. Lowered CIGs become more likely especially along the coast Sat night thru Sunday, with IFR/ LIFR CIG/VSBY potential as flow turns out of the S/SE. Restrictions would likely be more periodic the more inland you are. Restrictions lift Mon into Tue with W flow and daily sea breezes through early week.
MARINE
Short Term...Conditions hazardous to small craft are not expected. Winds will primarily be southeasterly today before shifting northeasterly tonight as low pressure crosses the waters. Winds will stay northeasterly through Friday morning, before shifting back to southerly Friday afternoon.
Long Term...Northeast flow early Saturday turns southeasterly through the day and into Sunday... then southerly with the approach of a cold front Sunday night, remaining AOB 20 kts and waves AOB 3 ft for the duration. Westerly flow returns for the start of next week with daily seabreezes pulling flow southwesterly over the coastal waters... to easterly along the immediate shoreline.
GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None.
Area Forecast Discussion National Weather Service Gray ME 342 AM EDT Thu May 2 2024
SYNOPSIS
Warm conditions in southwest New Hampshire will sharply contrast cool, low overcast conditions elsewhere today. Rain showers are possible anywhere, but will generally be most likely and most frequent over central
northern
and eastern areas.
Drier weather returns Friday into Saturday, however the pattern remains unsettled and humid with increasing clouds and more showers late in the weekend. The upcoming work week starts on a drying, clearing, and warming trend.
NEAR TERM /TODAY/
Impacts: *No significant weather impacts expected
Some convection is rolling over the ridge early this morning and is just about at the Vermont-New Hampshire border at the time of this writing. RAP13 analysis shows it is out running the shortwave that providing the forcing, however even though its weakening, cloud tops are still cool so some isolated thunder is still possible predawn in New Hampshire. At the very least this will serve as the first round of showers today.
Otherwise a band of clouds associated with the warm front aloft persists across the area with more forming upstream. These will hamper warming today for Maine and Eastern New Hampshire with highs expected to cap out in the low to mid 50s. The exception will be in western and southern New Hampshire where, when the surface warm front arrives, skies likely clear enough to allow temperatures into the upper 60s and low 70s. How far into the state this penetrates will be a question, but it looks like it could make it to at least Concord before temperatures sharply drop off. Positive theta-E along the warm front will also provide some instability for thunderstorms to develop. SPC mesoanalysis suggests 700-500mb lapse rates across central New Hampshire this afternoon will be in the 6-7C/km range. Rain showers will cross central Maine as well, but with the much cooler temperatures these will not have a threat of lightning.
SHORT TERM /TONIGHT THROUGH FRIDAY/
Impacts: * No significant weather impacts expected
All showers will taper off quickly heading into the night as a 500 mb ridge begins to build into the area. This subsidence following the rain will likely result in patchy fog in the usual valley locations. Skies will start to clear from north to south, but only partly, so would expect most of the area to see lows in the 40s with some upper 30s north of the mountains where the most clearing will be realized the most.
Skies will remain partly cloudy through the day Friday, but with surface high pressure and a 500mb ridge continuing to build in we will remain dry with highs in the upper 50s to mid 60s.
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/
Anomalously high heights will persist over the Northeast through the duration of the extended forecast period... which will allow an anomalously warm airmass to build into the mid- levels. In spite of this, it is still very much Spring in New England, and surface flow relative to the Gulf of Maine will ultimately call the shots regarding the sensible weather conditions. High pressure initially sits offshore this weekend, which keeps conditions humid and cooler than average. A cold front crosses late in the weekend with rain showers, with offshore flow in its wake bringing fresh flow out of the west or northwest into New England with warmer, drier air and sunnier skies. The weather pattern remains active however with another chance for rain around the the middle or latter part of next week.
Starting Friday night... surface high pressure centered over Labrador builds south along the Eastern Seaboard, re-centering to near Nova Scotia by Sunday. At the same time, low pressure near Hudson Bay slowly drifts east... bringing a slow-moving cold front into the Northeast. Resultant northeasterly-turning- southeasterly flow over our forecast area brings a steadily moistening column over the weekend, leading to increasing clouds and eventually rain showers late Saturday through Sunday.
Temperatures on Saturday will vary depending on proximity to the coastline, with 60s over the interior of New Hampshire but 50s more likely in Maine and toward the Seacoast... and the immediate coastline sticking closer to SSTs in the 40s.
Thickening cloud decks and continued onshore flow produces a fairly dreary Sunday with temperatures in the 40s and 50s and rain showers. Forcing doesn't look great, with the parent circulation well north of the region; ensembles bring on average 0.25-0.4" of rain however would expect higher and lower amounts, with an inch or so on the high end given decent moisture depth and some areas possibly staying dry. Instability doesn't appear to be a major factor at this time.
The cold front crosses late Sunday into Monday, with showers ending by the end of the day Monday... though cyclonic flow and slowed frontal movement may delay improvement. Drier flow out of the west will allow for stronger mixing with minimal maritime influence, in turn allowing temperatures to warm strongly into the 70s... except the 60s along the coast where a weak onshore component persists, and across the north where clouds and some showers likely hang around. Tuesday sees a similar fate with highs again in the 60s and 70s and a sunnier mix of clouds and sun.
The next wave moving through the upper level pattern approaches New England by the middle of the week with flow again turning southerly to onshore
Thus, can expect cloudier
more humid...
and likely cooler and showery weather to make a return sometime in the middle or end of next week.
AVIATION /07Z THURSDAY THROUGH MONDAY/
Short Term...A mix of IFR and MVFR ceilings are whats out there this morning with some light rain and fog. The fog will dissipate later this morning but low ceilings in light rain showers will persist through today. Thunderstorms may form and move through central New Hampshire this afternoon briefly impacting KCON and KMHT. Patchy fog may continue localized IFR at the valley terminals Thursday night into early Friday morning, otherwise Friday will see mostly VFR conditions.
Long Term...VFR prevails Sat with flow generally out of the E AOB 15 kts. Lowered CIGs become more likely especially along the coast Sat night thru Sunday, with IFR/ LIFR CIG/VSBY potential as flow turns out of the S/SE. Restrictions would likely be more periodic the more inland you are. Restrictions lift Mon into Tue with W flow and daily sea breezes through early week.
MARINE
Short Term...Conditions hazardous to small craft are not expected. Winds will primarily be southeasterly today before shifting northeasterly tonight as low pressure crosses the waters. Winds will stay northeasterly through Friday morning, before shifting back to southerly Friday afternoon.
Long Term...Northeast flow early Saturday turns southeasterly through the day and into Sunday... then southerly with the approach of a cold front Sunday night, remaining AOB 20 kts and waves AOB 3 ft for the duration. Westerly flow returns for the start of next week with daily seabreezes pulling flow southwesterly over the coastal waters... to easterly along the immediate shoreline.
GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| SEIM1 | 1 mi | 55 min | 48°F | 47°F | 30.01 | 48°F | ||
| BGXN3 - Great Bay Reserve, NH | 3 mi | 70 min | SSW 1.9 | 46°F | 30.01 | 44°F | ||
| IOSN3 - Isle of Shoals, NH | 11 mi | 55 min | SW 12G | 47°F | 29.98 | 43°F | ||
| 44073 | 13 mi | 140 min | SSW 5.8G | 48°F | 47°F | |||
| 44030 - Buoy B0102 - Western Maine Shelf | 19 mi | 111 min | SSW 5.8G | 47°F | 47°F | 1 ft | 29.98 | |
| WEXM1 - Wells Reserve, ME | 21 mi | 55 min | S 2.9 | 47°F | 46°F | |||
| 44098 - Jeffrey's Ledge, NH (160) | 37 mi | 59 min | 47°F | 2 ft | ||||
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 40 mi | 111 min | S 7.8G | 47°F | 47°F | 2 ft | 30.01 | |
| 44007 - PORTLAND 12 NM Southeast of Portland,ME | 45 mi | 35 min | S 7.8G | 47°F | 46°F | 1 ft | 29.97 | 46°F |
| CASM1 - 8418150 - Portland, ME | 49 mi | 55 min | S 5.1G | 47°F | 45°F | 29.96 |
toggle option: (graph/table)
No data
Airport Reports
EDIT (hide/show) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| KPSM PORTSMOUTH INTL AT PEASE,NH | 3 sm | 48 min | SSW 04 | 10 sm | Overcast | 48°F | 45°F | 87% | 29.98 | |
| KDAW SKYHAVEN,NH | 16 sm | 51 min | S 03 | 10 sm | Overcast | 48°F | 45°F | 87% | 29.97 | |
| KSFM SANFORD SEACOAST RGNL,ME | 22 sm | 58 min | SSW 05 | 10 sm | Overcast | Lt Rain | 46°F | 45°F | 93% | 29.99 |
Tide / Current for Atlantic Heights, Piscataqua River, New Hampshire
EDIT Weekend mode (on/off) (hide/show) Help
Atlantic Heights
Click for Map
Thu -- 12:13 AM EDT 1.21 feet Low Tide
Thu -- 02:57 AM EDT Moonrise
Thu -- 05:34 AM EDT Sunrise
Thu -- 06:37 AM EDT 7.72 feet High Tide
Thu -- 12:57 PM EDT 0.35 feet Low Tide
Thu -- 01:07 PM EDT Moonset
Thu -- 07:28 PM EDT 7.19 feet High Tide
Thu -- 07:46 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 12:13 AM EDT 1.21 feet Low Tide
Thu -- 02:57 AM EDT Moonrise
Thu -- 05:34 AM EDT Sunrise
Thu -- 06:37 AM EDT 7.72 feet High Tide
Thu -- 12:57 PM EDT 0.35 feet Low Tide
Thu -- 01:07 PM EDT Moonset
Thu -- 07:28 PM EDT 7.19 feet High Tide
Thu -- 07:46 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Atlantic Heights, Piscataqua River, New Hampshire, Tide feet
| 12 am |
| 1.2 |
| 1 am |
| 1.4 |
| 2 am |
| 2.3 |
| 3 am |
| 3.7 |
| 4 am |
| 5.3 |
| 5 am |
| 6.7 |
| 6 am |
| 7.6 |
| 7 am |
| 7.7 |
| 8 am |
| 7 |
| 9 am |
| 5.6 |
| 10 am |
| 3.8 |
| 11 am |
| 2 |
| 12 pm |
| 0.8 |
| 1 pm |
| 0.4 |
| 2 pm |
| 0.8 |
| 3 pm |
| 1.8 |
| 4 pm |
| 3.4 |
| 5 pm |
| 5.1 |
| 6 pm |
| 6.4 |
| 7 pm |
| 7.1 |
| 8 pm |
| 7.1 |
| 9 pm |
| 6.3 |
| 10 pm |
| 4.9 |
| 11 pm |
| 3.2 |
Portsmouth Harbor Entrance
Click for Map
Thu -- 02:17 AM EDT 0.00 knots Slack
Thu -- 02:57 AM EDT Moonrise
Thu -- 04:19 AM EDT 1.06 knots Max Flood
Thu -- 05:34 AM EDT Sunrise
Thu -- 07:36 AM EDT -0.00 knots Slack
Thu -- 10:57 AM EDT -1.84 knots Max Ebb
Thu -- 01:07 PM EDT Moonset
Thu -- 02:56 PM EDT 0.00 knots Slack
Thu -- 04:56 PM EDT 1.11 knots Max Flood
Thu -- 07:45 PM EDT Sunset
Thu -- 08:42 PM EDT -0.00 knots Slack
Thu -- 11:29 PM EDT -1.62 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 02:17 AM EDT 0.00 knots Slack
Thu -- 02:57 AM EDT Moonrise
Thu -- 04:19 AM EDT 1.06 knots Max Flood
Thu -- 05:34 AM EDT Sunrise
Thu -- 07:36 AM EDT -0.00 knots Slack
Thu -- 10:57 AM EDT -1.84 knots Max Ebb
Thu -- 01:07 PM EDT Moonset
Thu -- 02:56 PM EDT 0.00 knots Slack
Thu -- 04:56 PM EDT 1.11 knots Max Flood
Thu -- 07:45 PM EDT Sunset
Thu -- 08:42 PM EDT -0.00 knots Slack
Thu -- 11:29 PM EDT -1.62 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Portsmouth Harbor Entrance, New Hampshire Current, knots
| 12 am |
| -1.1 |
| 1 am |
| -0.7 |
| 2 am |
| -0.2 |
| 3 am |
| 0.5 |
| 4 am |
| 1 |
| 5 am |
| 0.9 |
| 6 am |
| 0.5 |
| 7 am |
| 0.2 |
| 8 am |
| -0.2 |
| 9 am |
| -0.8 |
| 10 am |
| -1.6 |
| 11 am |
| -1.8 |
| 12 pm |
| -1.6 |
| 1 pm |
| -1.2 |
| 2 pm |
| -0.7 |
| 3 pm |
| 0 |
| 4 pm |
| 0.8 |
| 5 pm |
| 1.1 |
| 6 pm |
| 0.9 |
| 7 pm |
| 0.6 |
| 8 pm |
| 0.3 |
| 9 pm |
| -0.2 |
| 10 pm |
| -1 |
| 11 pm |
| -1.6 |
Portland, ME,
NOTICE: Some pages have affiliate links to Amazon. As an Amazon Associate, I earn from qualifying purchases. Please read website Cookie, Privacy, and Disclamers by clicking HERE. To contact me click HERE. For my YouTube page click HERE