Marine Weather and Tide Forecast for Arnold, MD
April 18, 2025 6:18 PM EDT (22:18 UTC) Change Location
![]() | Sunrise 6:22 AM Sunset 7:47 PM Moonrise 12:00 AM Moonset 8:31 AM |
ANZ538 Patapsco River Including Baltimore Harbor- 536 Pm Edt Fri Apr 18 2025
.small craft advisory in effect through Saturday evening - .
Tonight - S winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
Sat - SW winds 10 kt with gusts to 25 kt. Waves 1 ft.
Sat night - W winds 5 to 10 kt - .becoming nw late. Gusts up to 20 kt. Waves 1 ft.
Sun - N winds 5 kt. Waves less than 1 ft.
Sun night - E winds 5 kt. Waves flat.
Mon - SE winds 5 to 10 kt. Waves 1 ft.
Mon night - S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Tue - W winds 5 to 10 kt. Waves 1 ft or less. A chance of showers in the morning.
Wed - SE winds around 5 kt. Waves flat.
ANZ500 536 Pm Edt Fri Apr 18 2025
Synopsis for the tidal potomac and md portion of the chesapeake bay -
a warm front will pass through the waters tonight before the next cold front approaches Saturday into Saturday night. The boundary will pass through the area Sunday before settling to our south early next week. Boaters should be aware of the threats of boating in cold water, even when air temperatures are warm. Visit weather.gov/safety/coldwater for more information.
a warm front will pass through the waters tonight before the next cold front approaches Saturday into Saturday night. The boundary will pass through the area Sunday before settling to our south early next week. Boaters should be aware of the threats of boating in cold water, even when air temperatures are warm. Visit weather.gov/safety/coldwater for more information.
7 Day Forecast for Marine Location Near Arnold, MD

NEW! Add second zone forecast
Brewer Point Click for Map Fri -- 12:43 AM EDT Moonrise Fri -- 03:06 AM EDT 0.23 feet Low Tide Fri -- 06:24 AM EDT Sunrise Fri -- 09:31 AM EDT Moonset Fri -- 09:51 AM EDT 1.13 feet High Tide Fri -- 05:26 PM EDT 0.31 feet Low Tide Fri -- 07:46 PM EDT Sunset Fri -- 10:30 PM EDT 0.70 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |   |
Brewer Point, Maryland, Tide feet
12 am |
0.5 |
1 am |
0.4 |
2 am |
0.3 |
3 am |
0.2 |
4 am |
0.3 |
5 am |
0.4 |
6 am |
0.6 |
7 am |
0.8 |
8 am |
1 |
9 am |
1.1 |
10 am |
1.1 |
11 am |
1.1 |
12 pm |
0.9 |
1 pm |
0.8 |
2 pm |
0.6 |
3 pm |
0.5 |
4 pm |
0.4 |
5 pm |
0.3 |
6 pm |
0.3 |
7 pm |
0.4 |
8 pm |
0.5 |
9 pm |
0.6 |
10 pm |
0.7 |
11 pm |
0.7 |
Baltimore Harbor Approach Click for Map Fri -- 12:24 AM EDT -0.00 knots Slack Fri -- 12:42 AM EDT Moonrise Fri -- 03:10 AM EDT -0.37 knots Max Ebb Fri -- 05:36 AM EDT 0.00 knots Slack Fri -- 06:24 AM EDT Sunrise Fri -- 09:30 AM EDT Moonset Fri -- 09:36 AM EDT 0.88 knots Max Flood Fri -- 01:12 PM EDT -0.00 knots Slack Fri -- 04:40 PM EDT -0.81 knots Max Ebb Fri -- 07:45 PM EDT Sunset Fri -- 08:44 PM EDT 0.00 knots Slack Fri -- 10:55 PM EDT 0.28 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION |   |
Baltimore Harbor Approach, Maryland Current, knots
12 am |
0.1 |
1 am |
-0.1 |
2 am |
-0.3 |
3 am |
-0.4 |
4 am |
-0.3 |
5 am |
-0.2 |
6 am |
0.1 |
7 am |
0.4 |
8 am |
0.7 |
9 am |
0.9 |
10 am |
0.9 |
11 am |
0.7 |
12 pm |
0.4 |
1 pm |
0.1 |
2 pm |
-0.3 |
3 pm |
-0.6 |
4 pm |
-0.8 |
5 pm |
-0.8 |
6 pm |
-0.7 |
7 pm |
-0.5 |
8 pm |
-0.2 |
9 pm |
0.1 |
10 pm |
0.2 |
11 pm |
0.3 |
Area Discussion for Baltimore, MD/Washington
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FXUS61 KLWX 181735 AFDLWX
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 135 PM EDT Fri Apr 18 2025
SYNOPSIS
A warm front lifts through the area tonight, bringing milder conditions. High pressure to the south dominate the weather pattern for Saturday with much warmer temperatures. A cold front passes through Sunday morning, then high pressure builds in from the north. Another front moves through on Tuesday.
NEAR TERM /THROUGH TONIGHT/
Temperatures are steadily increasing early this afternoon, now in the 70s across the area. Expect upper 70s to low 80s for mid to late afternoon. A warm front that lifts through the area will keep conditions mild tonight, with lows in the 60s.
Breezy conditions are expected this afternoon and early evening, with gusts around 25-30 mph. In the VA/MD Piedmont and some of the mountains locally higher gusts around 35-40 mph are likely for a few hours. Winds decrease after sunset, though breezy conditions continue through the night (gusts around 15-25 mph).
SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/
A sharpening mid-level ridge over the Southeast U.S. nudges its way toward the Mid-Atlantic on Saturday. This is going to produce the warmest day of the year so far, with highs reaching the mid to upper 80s. A cold front approaches from the OH Valley, though the ridge is likely to keep this system well north/west of our area. Isolated to scattered showers reach the Alleghenies Saturday night, otherwise we remain dry east of the mountains. Still mild Saturday night with lows in the upper 50s to mid 60s.
The front moves into the area Saturday night into Sunday. The main impact from this is expected to be less warmer temperatures and cloudy skies for Eastern Sunday. Highs are forecast to be in the 70s, though a few spots in Central VA could reach 80F and those in Northeast MD struggling to reach 70F. Easterly flow returns Sunday night with lows in the 50s.
LONG TERM /MONDAY THROUGH FRIDAY/
A surface low pressure system will track NE across the Great Lakes on Monday with the associated cold front pushing through the forecast area Monday night. As the cold front moves through the area, precipitation chances increase with rain showers possible. The more favorable conditions for convection will remain to our west, although isolated thunderstorms are possible.
In the wake of the frontal passage, high pressure builds over the Mid-Atlantic through midweek. Conditions dry out Tuesday as cloud cover decreases. As high pressure shifts offshore, southerly flow ushers in moist air aloft with cloud cover expected to increase.
Additionally, a cold front approaches from the northwest with low end PoPs forecast throughout the day on Thursday.
High temperatures will be in the 70s to low 80s each day with overnight low temperatures in the 50s (40s in the mtns) for most.
AVIATION /18Z FRIDAY THROUGH WEDNESDAY/
VFR conditions are expected through the weekend. Gusty southerly winds around 25-30 knots this afternoon, diminish to around 20 knots tonight, then increase again to 20-25 knots Saturday afternoon. Winds diminish Saturday night into Sunday.
VFR conditions are expected across all terminals Monday and Tuesday.
As precipitation chances increase overnight Monday into Tuesday, sub- VFR conditions are possible. Southerly winds on Monday shift to westerly on Tuesday.
MARINE
Winds are slowly increasing across the waters early this afternoon. A prolonged period of Small Craft Advisory conditions has begun and will continue through Saturday night.
South winds gust around 25 knots late afternoon, then diminish slightly to 20-25 knots tonight, and will be around 20 knots through Saturday afternoon. Winds slowly shift from south today to southwest on Saturday. Winds diminish Saturday night as a cold front moves south into the area, causing winds to become northerly, then easterly by Sunday evening.
SCA criteria winds are possible on Monday with southerly flow. Winds diminish on Tuesday, with sub-SCA criteria winds expected.
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 8 PM EDT Saturday for ANZ530>543.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 135 PM EDT Fri Apr 18 2025
SYNOPSIS
A warm front lifts through the area tonight, bringing milder conditions. High pressure to the south dominate the weather pattern for Saturday with much warmer temperatures. A cold front passes through Sunday morning, then high pressure builds in from the north. Another front moves through on Tuesday.
NEAR TERM /THROUGH TONIGHT/
Temperatures are steadily increasing early this afternoon, now in the 70s across the area. Expect upper 70s to low 80s for mid to late afternoon. A warm front that lifts through the area will keep conditions mild tonight, with lows in the 60s.
Breezy conditions are expected this afternoon and early evening, with gusts around 25-30 mph. In the VA/MD Piedmont and some of the mountains locally higher gusts around 35-40 mph are likely for a few hours. Winds decrease after sunset, though breezy conditions continue through the night (gusts around 15-25 mph).
SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/
A sharpening mid-level ridge over the Southeast U.S. nudges its way toward the Mid-Atlantic on Saturday. This is going to produce the warmest day of the year so far, with highs reaching the mid to upper 80s. A cold front approaches from the OH Valley, though the ridge is likely to keep this system well north/west of our area. Isolated to scattered showers reach the Alleghenies Saturday night, otherwise we remain dry east of the mountains. Still mild Saturday night with lows in the upper 50s to mid 60s.
The front moves into the area Saturday night into Sunday. The main impact from this is expected to be less warmer temperatures and cloudy skies for Eastern Sunday. Highs are forecast to be in the 70s, though a few spots in Central VA could reach 80F and those in Northeast MD struggling to reach 70F. Easterly flow returns Sunday night with lows in the 50s.
LONG TERM /MONDAY THROUGH FRIDAY/
A surface low pressure system will track NE across the Great Lakes on Monday with the associated cold front pushing through the forecast area Monday night. As the cold front moves through the area, precipitation chances increase with rain showers possible. The more favorable conditions for convection will remain to our west, although isolated thunderstorms are possible.
In the wake of the frontal passage, high pressure builds over the Mid-Atlantic through midweek. Conditions dry out Tuesday as cloud cover decreases. As high pressure shifts offshore, southerly flow ushers in moist air aloft with cloud cover expected to increase.
Additionally, a cold front approaches from the northwest with low end PoPs forecast throughout the day on Thursday.
High temperatures will be in the 70s to low 80s each day with overnight low temperatures in the 50s (40s in the mtns) for most.
AVIATION /18Z FRIDAY THROUGH WEDNESDAY/
VFR conditions are expected through the weekend. Gusty southerly winds around 25-30 knots this afternoon, diminish to around 20 knots tonight, then increase again to 20-25 knots Saturday afternoon. Winds diminish Saturday night into Sunday.
VFR conditions are expected across all terminals Monday and Tuesday.
As precipitation chances increase overnight Monday into Tuesday, sub- VFR conditions are possible. Southerly winds on Monday shift to westerly on Tuesday.
MARINE
Winds are slowly increasing across the waters early this afternoon. A prolonged period of Small Craft Advisory conditions has begun and will continue through Saturday night.
South winds gust around 25 knots late afternoon, then diminish slightly to 20-25 knots tonight, and will be around 20 knots through Saturday afternoon. Winds slowly shift from south today to southwest on Saturday. Winds diminish Saturday night as a cold front moves south into the area, causing winds to become northerly, then easterly by Sunday evening.
SCA criteria winds are possible on Monday with southerly flow. Winds diminish on Tuesday, with sub-SCA criteria winds expected.
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 8 PM EDT Saturday for ANZ530>543.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
APAM2 - 8575512 - Annapolis, MD | 4 mi | 49 min | SSE 8.9G | 68°F | 30.08 | |||
44063 - Annapolis | 6 mi | 31 min | S 18G | 59°F | 55°F | 1 ft | ||
CPVM2 | 8 mi | 49 min | 65°F | 54°F | ||||
TPLM2 - Thomas Point, MD | 10 mi | 19 min | SE 22G | 63°F | 30.10 | |||
FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 13 mi | 49 min | S 16G | 66°F | 30.08 | |||
BLTM2 - 8574680 - Baltimore, MD | 17 mi | 49 min | SSE 4.1G | 66°F | 53°F | |||
BSLM2 - Chesapeake Bay, MD | 20 mi | 49 min | S 9.9 | 79°F | 30.06 | 47°F | ||
TCBM2 - 8573364 - Tolchester Beach, MD | 20 mi | 49 min | SSE 6G | 72°F | 30.09 | |||
WASD2 - 8594900 - Washington, DC | 28 mi | 49 min | SSW 12G | 78°F | 58°F | 30.06 | ||
CXLM2 | 31 mi | 49 min | SSE 9.9G | |||||
44062 - Gooses Reef, MD | 33 mi | 31 min | SSE 18G | 58°F | 54°F | 3 ft | ||
CA2 - 8571892 - Cambridge, MD | 40 mi | 49 min | S 15G | 71°F | 56°F | 30.13 | ||
COVM2 - 8577018 - Cove Point LNG Pier, MD | 44 mi | 49 min | S 16G | 59°F | 30.12 | |||
SLIM2 - 8577330 - Solomons Island, MD | 49 mi | 49 min | SE 15G | 64°F | 57°F | 30.09 |
Wind History for Francis Scott Key Bridge NE Tower, MD
toggle option: (graph/table)
No data
Airport Reports
Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
KBWI BALTIMORE/WASHINGTON INTL THURGOOD MARSHALL,MD | 13 sm | 24 min | ESE 13G19 | 10 sm | Mostly Cloudy | 73°F | 52°F | 47% | 30.05 | |
KFME TIPTON,MD | 13 sm | 9 min | SE 08G17 | 10 sm | Clear | 77°F | 46°F | 34% | 30.07 | |
KCGS COLLEGE PARK,MD | 21 sm | 13 min | S 08G19 | 10 sm | Clear | 81°F | 45°F | 28% | 30.05 | |
KMTN MARTIN STATE,MD | 22 sm | 27 min | SE 12 | 10 sm | Clear | 68°F | 54°F | 60% | 30.10 | |
KADW JOINT BASE ANDREWS,MD | 24 sm | 23 min | SSW 14G21 | 10 sm | Clear | 79°F | 45°F | 30% | 30.04 |
Link to 1 hour of 5 minute data for KNAK
Terminal Aerodrome Forecast (TAF) for KNAK
Wind History Graph: NAK
(wind in knots)GEOS Local Image of Mid-Atlantic
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