Marine Weather and Tide Forecast for Grasonville, MD
 | Sunrise 6:19 AM Sunset 7:46 PM Moonrise 8:14 AM Moonset 12:00 AM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ540 Eastern Bay- 457 Am Edt Tue Apr 21 2026
.small craft advisory in effect from this evening through Wednesday morning - .
Rest of the overnight - NE winds 10 kt. Waves 1 ft.
Today - NE winds 5 to 10 kt - .becoming S in the afternoon. Waves 1 ft.
Tonight - S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Wed - SW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves 1 to 2 ft. Showers likely.
Wed night - NW winds around 5 kt. Waves 1 ft or less.
Thu - NW winds around 5 kt. Waves flat.
Thu night - S winds around 5 kt. Waves flat.
Fri - E winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night.
Sat - E winds 10 to 15 kt. Waves 1 ft. A chance of showers in the morning, then showers likely.
ANZ500 457 Am Edt Tue Apr 21 2026
Synopsis for the tidal potomac and md portion of the chesapeake bay -
high pressure will build in today. A weak cold front looks to drop in from the north Wednesday, then cross the mid-atlantic by Thursday. Small craft advisories may be needed Wednesday in a south to southwest flow. Additional small craft advisories are possible later this week and weekend as multiple fronts and waves of low pressure traverse the region.
high pressure will build in today. A weak cold front looks to drop in from the north Wednesday, then cross the mid-atlantic by Thursday. Small craft advisories may be needed Wednesday in a south to southwest flow. Additional small craft advisories are possible later this week and weekend as multiple fronts and waves of low pressure traverse the region.
7 Day Forecast for Marine Location Near Grasonville, MD
NEW! Add second zone forecast
| Claiborne Click for Map Tue -- 12:13 AM EDT Moonset Tue -- 01:17 AM EDT 0.13 feet Low Tide Tue -- 06:20 AM EDT Sunrise Tue -- 08:00 AM EDT 1.72 feet High Tide Tue -- 09:15 AM EDT Moonrise Tue -- 03:29 PM EDT 0.34 feet Low Tide Tue -- 07:48 PM EDT Sunset Tue -- 08:22 PM EDT 0.97 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Claiborne, Eastern Bay, Chesapeake Bay, Maryland, Tide feet
| 12 am |
| 0.2 |
| 1 am |
| 0.1 |
| 2 am |
| 0.2 |
| 3 am |
| 0.3 |
| 4 am |
| 0.6 |
| 5 am |
| 1 |
| 6 am |
| 1.4 |
| 7 am |
| 1.6 |
| 8 am |
| 1.7 |
| 9 am |
| 1.6 |
| 10 am |
| 1.4 |
| 11 am |
| 1.2 |
| 12 pm |
| 0.9 |
| 1 pm |
| 0.7 |
| 2 pm |
| 0.5 |
| 3 pm |
| 0.4 |
| 4 pm |
| 0.4 |
| 5 pm |
| 0.5 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.9 |
| 8 pm |
| 1 |
| 9 pm |
| 0.9 |
| 10 pm |
| 0.8 |
| 11 pm |
| 0.6 |
| Wye River Click for Map Flood direction 30 true Ebb direction 190 true Tue -- 12:13 AM EDT Moonset Tue -- 02:15 AM EDT 0.00 knots Slack Tue -- 05:21 AM EDT 0.95 knots Max Flood Tue -- 06:19 AM EDT Sunrise Tue -- 08:58 AM EDT -0.00 knots Slack Tue -- 09:14 AM EDT Moonrise Tue -- 12:35 PM EDT -0.93 knots Max Ebb Tue -- 04:54 PM EDT 0.00 knots Slack Tue -- 06:26 PM EDT 0.34 knots Max Flood Tue -- 07:47 PM EDT Sunset Tue -- 08:55 PM EDT -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Wye River, west of Bruffs Island (depth 9 ft), Eastern Bay, Maryland Current, knots
| 12 am |
| -0.5 |
| 1 am |
| -0.3 |
| 2 am |
| -0.1 |
| 3 am |
| 0.3 |
| 4 am |
| 0.7 |
| 5 am |
| 0.9 |
| 6 am |
| 0.9 |
| 7 am |
| 0.7 |
| 8 am |
| 0.4 |
| 9 am |
| -0 |
| 10 am |
| -0.4 |
| 11 am |
| -0.7 |
| 12 pm |
| -0.9 |
| 1 pm |
| -0.9 |
| 2 pm |
| -0.8 |
| 3 pm |
| -0.6 |
| 4 pm |
| -0.3 |
| 5 pm |
| 0 |
| 6 pm |
| 0.3 |
| 7 pm |
| 0.3 |
| 8 pm |
| 0.2 |
| 9 pm |
| -0 |
| 10 pm |
| -0.2 |
| 11 pm |
| -0.4 |
Area Discussion for Philadelphia/Mount Holly, PA
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FXUS61 KPHI 210733 AFDPHI
Area Forecast Discussion National Weather Service Mount Holly NJ 333 AM EDT Tue Apr 21 2026
WHAT HAS CHANGED
A Small Craft Advisory has been issued for the Delaware Bay and a portion of the Atlantic coastal waters for tonight into tomorrow morning.
KEY MESSAGES
1. Trending warmer today after a cold night. Some rain showers also move in for tonight.
2. A return to above average temperatures briefly later this week before cooling down again over the weekend. Widespread rainfall possible over the weekend.
DISCUSSION
KEY MESSAGE 1...Trending warmer today after a cold night. Some rain showers also move in for tonight into Wednesday.
After a cold night across the area, we start to warm up today.
Freeze warnings remain unchanged through mid-morning before we see temperatures climb through the day. This will be due to our high pressure system moving offshore today and allowing for return flow to develop with a south to southwest wind. Warm air advection takes place today into tonight allowing for this warm up. High temperatures reach into the 50s for many.
In the wake of our high pressure system, a weak low pressure system approaches the area from the Great Lakes region tonight resulting in rain showers developing across the area. This system slowly clears the region later in the day Wednesday. Lows tonight are in the mid 30s to mid 40s with highs Wednesday in the upper 50s to upper 60s.
KEY MESSAGE 2...A return to above average temperatures briefly later this week before cooling down again over the weekend.
Widespread rainfall possible over the weekend.
In the wake of Wednesday's system, warm air advection and rising heights will result in temperatures climbing back above average Thursday through Friday. Highs for most of the area are forecast to be in the 70s for Thursday. By Friday, a backdoor cold front may arrive which pushes temps back down a few degrees, though uncertainty here is high and if the front is potent, it could be more than just a few degrees. A low pressure may then arrive Friday night into Saturday with some showers, and with the air mass behind the backdoor front becoming more firmly established, Saturday now looks 10-15 degrees cooler than Friday, possibly even more.
In terms of rainfall, the next low pressure over the weekend has the potential for widespread showers or a period of rain.
The strength and timing of the involved features for the weekend however is lower confidence. The pattern that is currently indicated among the model guidance however would result in perhaps up to a half inch of very beneficial rainfall.
Uncertainty remains high, however.
AVIATION /07Z TUESDAY THROUGH SATURDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.
Thru 12Z this morning...VFR with a mainly clear sky. A north wind around 5 kt becoming light and variable at times. High confidence.
Today...VFR with increasing clouds, particularly for the afternoon. A north wind in the morning, transitions to southwest around 5-10 kt in the afternoon. Toward evening, winds turn more southerly at 5-10 kt. High confidence.
Tonight...Mainly VFR. MVFR conditions possible in any rain showers but was too low confidence to include in the TAF currently. Winds remain out of the south at 5-10 kt.
Outlook...
Sub-VFR conditions possible Wednesday with showers. VFR likely returns by Wednesday night and continues through Friday. Sub-VFR then likely returns Friday night and especially Saturday.
MARINE
A north wind in the morning gradually shifts to be out of the south- southeast this afternoon at around 10 knots with gusts up to 15 knots. Winds increase out of the south tonight at 15-20 knots with gusts to 25 knots. A Small Craft Advisory has been issued for the Delaware Bay from 2AM to 8AM Wednesday. For a portion of the Atlantic coastal waters, a Small Craft Advisory has been issued from 2AM to 11AM Wednesday. Seas through the period are 2-4 feet.
Outlook...
Sub-SCA expected Wednesday night through Friday night. Marginal SCA conditions possible Saturday with gusts up to 25 kts and seas up to 5 feet.
CLIMATE
Record low temperatures are possible at some climate sites for this morning, April 21st. Below are the daily low temperature records for 4/21:
Daily Record Low Temperatures April 21 Site Record/Year Allentown (ABE) 28/1925 & 1956 & 2018 AC Airport (ACY) 25/1981 AC Marina (55N) 26/1875 Georgetown (GED) 27/1961 Mount Pocono (MPO) 11/1908 Philadelphia (PHL) 27/1875 Reading (RDG) 26/1982 Trenton (TTN) 30/1907 & 1925 Wilmington (ILG) 28/1925
PHI WATCHES/WARNINGS/ADVISORIES
PA...Freeze Warning until 9 AM EDT this morning for PAZ060>062-070- 071-101>106.
Freeze Warning until 10 AM EDT this morning for PAZ054-055.
NJ...Freeze Warning until 9 AM EDT this morning for NJZ007>010- 012>023-027.
Freeze Warning until 10 AM EDT this morning for NJZ001.
DE...Freeze Warning until 9 AM EDT this morning for DEZ001>003.
MD...Freeze Warning until 9 AM EDT this morning for MDZ012-015-019- 020.
MARINE...Small Craft Advisory from 2 AM to 8 AM EDT Wednesday for ANZ430-431.
Small Craft Advisory from 2 AM to 11 AM EDT Wednesday for ANZ450>455.
Area Forecast Discussion National Weather Service Mount Holly NJ 333 AM EDT Tue Apr 21 2026
WHAT HAS CHANGED
A Small Craft Advisory has been issued for the Delaware Bay and a portion of the Atlantic coastal waters for tonight into tomorrow morning.
KEY MESSAGES
1. Trending warmer today after a cold night. Some rain showers also move in for tonight.
2. A return to above average temperatures briefly later this week before cooling down again over the weekend. Widespread rainfall possible over the weekend.
DISCUSSION
KEY MESSAGE 1...Trending warmer today after a cold night. Some rain showers also move in for tonight into Wednesday.
After a cold night across the area, we start to warm up today.
Freeze warnings remain unchanged through mid-morning before we see temperatures climb through the day. This will be due to our high pressure system moving offshore today and allowing for return flow to develop with a south to southwest wind. Warm air advection takes place today into tonight allowing for this warm up. High temperatures reach into the 50s for many.
In the wake of our high pressure system, a weak low pressure system approaches the area from the Great Lakes region tonight resulting in rain showers developing across the area. This system slowly clears the region later in the day Wednesday. Lows tonight are in the mid 30s to mid 40s with highs Wednesday in the upper 50s to upper 60s.
KEY MESSAGE 2...A return to above average temperatures briefly later this week before cooling down again over the weekend.
Widespread rainfall possible over the weekend.
In the wake of Wednesday's system, warm air advection and rising heights will result in temperatures climbing back above average Thursday through Friday. Highs for most of the area are forecast to be in the 70s for Thursday. By Friday, a backdoor cold front may arrive which pushes temps back down a few degrees, though uncertainty here is high and if the front is potent, it could be more than just a few degrees. A low pressure may then arrive Friday night into Saturday with some showers, and with the air mass behind the backdoor front becoming more firmly established, Saturday now looks 10-15 degrees cooler than Friday, possibly even more.
In terms of rainfall, the next low pressure over the weekend has the potential for widespread showers or a period of rain.
The strength and timing of the involved features for the weekend however is lower confidence. The pattern that is currently indicated among the model guidance however would result in perhaps up to a half inch of very beneficial rainfall.
Uncertainty remains high, however.
AVIATION /07Z TUESDAY THROUGH SATURDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.
Thru 12Z this morning...VFR with a mainly clear sky. A north wind around 5 kt becoming light and variable at times. High confidence.
Today...VFR with increasing clouds, particularly for the afternoon. A north wind in the morning, transitions to southwest around 5-10 kt in the afternoon. Toward evening, winds turn more southerly at 5-10 kt. High confidence.
Tonight...Mainly VFR. MVFR conditions possible in any rain showers but was too low confidence to include in the TAF currently. Winds remain out of the south at 5-10 kt.
Outlook...
Sub-VFR conditions possible Wednesday with showers. VFR likely returns by Wednesday night and continues through Friday. Sub-VFR then likely returns Friday night and especially Saturday.
MARINE
A north wind in the morning gradually shifts to be out of the south- southeast this afternoon at around 10 knots with gusts up to 15 knots. Winds increase out of the south tonight at 15-20 knots with gusts to 25 knots. A Small Craft Advisory has been issued for the Delaware Bay from 2AM to 8AM Wednesday. For a portion of the Atlantic coastal waters, a Small Craft Advisory has been issued from 2AM to 11AM Wednesday. Seas through the period are 2-4 feet.
Outlook...
Sub-SCA expected Wednesday night through Friday night. Marginal SCA conditions possible Saturday with gusts up to 25 kts and seas up to 5 feet.
CLIMATE
Record low temperatures are possible at some climate sites for this morning, April 21st. Below are the daily low temperature records for 4/21:
Daily Record Low Temperatures April 21 Site Record/Year Allentown (ABE) 28/1925 & 1956 & 2018 AC Airport (ACY) 25/1981 AC Marina (55N) 26/1875 Georgetown (GED) 27/1961 Mount Pocono (MPO) 11/1908 Philadelphia (PHL) 27/1875 Reading (RDG) 26/1982 Trenton (TTN) 30/1907 & 1925 Wilmington (ILG) 28/1925
PHI WATCHES/WARNINGS/ADVISORIES
PA...Freeze Warning until 9 AM EDT this morning for PAZ060>062-070- 071-101>106.
Freeze Warning until 10 AM EDT this morning for PAZ054-055.
NJ...Freeze Warning until 9 AM EDT this morning for NJZ007>010- 012>023-027.
Freeze Warning until 10 AM EDT this morning for NJZ001.
DE...Freeze Warning until 9 AM EDT this morning for DEZ001>003.
MD...Freeze Warning until 9 AM EDT this morning for MDZ012-015-019- 020.
MARINE...Small Craft Advisory from 2 AM to 8 AM EDT Wednesday for ANZ430-431.
Small Craft Advisory from 2 AM to 11 AM EDT Wednesday for ANZ450>455.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| TPLM2 - Thomas Point, MD | 10 mi | 26 min | E 12G | 42°F | 30.41 | 24°F | ||
| CPVM2 | 11 mi | 56 min | 43°F | 27°F | ||||
| APAM2 - 8575512 - Annapolis, MD | 14 mi | 56 min | NNE 5.1G | 42°F | 60°F | 30.37 | ||
| CXLM2 | 14 mi | 56 min | E 2.9G | |||||
| CA2 - 8571892 - Cambridge, MD | 23 mi | 56 min | ENE 11G | 42°F | 62°F | 30.38 | ||
| TCBM2 - 8573364 - Tolchester Beach, MD | 23 mi | 56 min | ENE 2.9G | 36°F | 56°F | 30.39 | ||
| BCFM2 | 27 mi | 56 min | NE 8.9G | 40°F | 30.39 | |||
| 44080 | 28 mi | 44 min | NE 14G | 38°F | 56°F | 30.44 | ||
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 28 mi | 56 min | NE 6G | 38°F | 30.38 | |||
| BLTM2 - 8574680 - Baltimore, MD | 32 mi | 56 min | NE 8G | 40°F | 55°F | |||
| COVM2 - 8577018 - Cove Point LNG Pier, MD | 34 mi | 56 min | ENE 14G | 43°F | 30.40 | |||
| SLIM2 - 8577330 - Solomons Island, MD | 40 mi | 56 min | ENE 7G | 45°F | 60°F | 30.36 | ||
| WASD2 - 8594900 - Washington, DC | 41 mi | 56 min | E 1.9G | 41°F | 68°F | 30.36 | ||
| DRSD1 - Delaware Reserve, DE | 45 mi | 56 min | NNE 2.9 | 39°F | 30.36 | 25°F | ||
| BISM2 - 8571421 - Bishops Head, MD | 47 mi | 56 min | E 12G | 44°F | 57°F | 30.36 |
Wind History for Annapolis, MD
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KW29
Terminal Aerodrome Forecast (TAF) for KW29
Wind History Graph: W29
(wind in knots)
GEOS Local Image of east us
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Dover AFB, DE,
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