Marine Weather and Tide Forecast for Prince Frederick, MD
 | Sunrise 5:53 AM Sunset 8:15 PM Moonrise 6:00 AM Moonset 10:01 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ533 Chesapeake Bay From North Beach To Drum Point- 458 Am Edt Mon May 18 2026
.small craft advisory in effect from 3 pm edt this afternoon through late tonight - .
Rest of the overnight - S winds 5 kt. Waves less than 1 ft.
Today - S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Tonight - S winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft.
Tue - S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Tue night - S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Wed - SW winds 5 to 10 kt. Waves 1 to 2 ft. Showers likely.
Wed night - NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers.
Thu - N winds 15 to 20 kt - .becoming E 5 to 10 kt. Waves 2 to 3 ft - .subsiding to 1 ft. Showers likely .
Fri - E winds 10 to 15 kt. Waves 1 to 2 ft. Showers likely.
ANZ500 458 Am Edt Mon May 18 2026
Synopsis for the tidal potomac and md portion of the chesapeake bay -
high pressure will continue to strengthen offshore today through Tuesday leading to increased south to southwesterly flow. Expect small craft advisories for channeling this afternoon and again Tuesday afternoon. Winds will subside during the late evening and overnight periods. Additional small craft advisories will be needed Wednesday into Thursday as a cold front crosses the waters. The front will bring scattered to numerous showers and Thunderstorms Wednesday afternoon and evening. Special marine warnings may be needed for stronger Thunderstorms during this time.
high pressure will continue to strengthen offshore today through Tuesday leading to increased south to southwesterly flow. Expect small craft advisories for channeling this afternoon and again Tuesday afternoon. Winds will subside during the late evening and overnight periods. Additional small craft advisories will be needed Wednesday into Thursday as a cold front crosses the waters. The front will bring scattered to numerous showers and Thunderstorms Wednesday afternoon and evening. Special marine warnings may be needed for stronger Thunderstorms during this time.
7 Day Forecast for Marine Location Near Prince Frederick, MD
NEW! Add second zone forecast
| Plum Point Click for Map Flood direction 0 true Ebb direction 155 true Mon -- 01:12 AM EDT 0.00 knots Slack Mon -- 05:01 AM EDT 0.27 knots Max Flood Mon -- 05:51 AM EDT Sunrise Mon -- 07:00 AM EDT Moonrise Mon -- 07:54 AM EDT -0.00 knots Slack Mon -- 11:31 AM EDT -0.83 knots Max Ebb Mon -- 03:58 PM EDT 0.00 knots Slack Mon -- 06:05 PM EDT 0.09 knots Max Flood Mon -- 07:45 PM EDT -0.00 knots Slack Mon -- 08:13 PM EDT Sunset Mon -- 10:57 PM EDT -0.43 knots Max Ebb Mon -- 11:01 PM EDT Moonset Tide / Current data from XTide NOT FOR NAVIGATION |
Plum Point, 1.4 mi ESE of, Chesapeake Bay, Maryland Current, knots
| 12 am |
| -0.3 |
| 1 am |
| -0.1 |
| 2 am |
| 0.1 |
| 3 am |
| 0.2 |
| 4 am |
| 0.2 |
| 5 am |
| 0.3 |
| 6 am |
| 0.2 |
| 7 am |
| 0.1 |
| 8 am |
| -0 |
| 9 am |
| -0.4 |
| 10 am |
| -0.7 |
| 11 am |
| -0.8 |
| 12 pm |
| -0.8 |
| 1 pm |
| -0.7 |
| 2 pm |
| -0.5 |
| 3 pm |
| -0.2 |
| 4 pm |
| 0 |
| 5 pm |
| 0.1 |
| 6 pm |
| 0.1 |
| 7 pm |
| 0.1 |
| 8 pm |
| -0 |
| 9 pm |
| -0.2 |
| 10 pm |
| -0.4 |
| 11 pm |
| -0.4 |
| Broomes Island Click for Map Flood direction 290 true Ebb direction 110 true Mon -- 01:22 AM EDT 0.68 knots Max Flood Mon -- 05:12 AM EDT -0.00 knots Slack Mon -- 05:52 AM EDT Sunrise Mon -- 07:01 AM EDT Moonrise Mon -- 08:33 AM EDT -0.71 knots Max Ebb Mon -- 12:28 PM EDT 0.00 knots Slack Mon -- 02:26 PM EDT 0.23 knots Max Flood Mon -- 05:03 PM EDT -0.00 knots Slack Mon -- 07:59 PM EDT -0.37 knots Max Ebb Mon -- 08:13 PM EDT Sunset Mon -- 10:33 PM EDT 0.00 knots Slack Mon -- 11:00 PM EDT Moonset Tide / Current data from XTide NOT FOR NAVIGATION |
Broomes Island, 0.4 mi south of, Patuxent River, Maryland Current, knots
| 12 am |
| 0.5 |
| 1 am |
| 0.7 |
| 2 am |
| 0.7 |
| 3 am |
| 0.5 |
| 4 am |
| 0.3 |
| 5 am |
| 0.1 |
| 6 am |
| -0.3 |
| 7 am |
| -0.5 |
| 8 am |
| -0.7 |
| 9 am |
| -0.7 |
| 10 am |
| -0.6 |
| 11 am |
| -0.4 |
| 12 pm |
| -0.1 |
| 1 pm |
| 0.1 |
| 2 pm |
| 0.2 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.1 |
| 5 pm |
| 0 |
| 6 pm |
| -0.2 |
| 7 pm |
| -0.3 |
| 8 pm |
| -0.4 |
| 9 pm |
| -0.3 |
| 10 pm |
| -0.1 |
| 11 pm |
| 0.1 |
Area Discussion for Baltimore, MD/Washington
Hide HelpNOTE: mouseover dotted underlined text for definition
FXUS61 KLWX 180653 AFDLWX
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 253 AM EDT Mon May 18 2026
WHAT HAS CHANGED
No major changes were made to the current forecast package. Very hot conditions today and Tuesday with widespread thunderstorm chances returning Wednesday.
KEY MESSAGES
1) Near record warmth with isolated strong to severe thunderstorms over the mountains today and Tuesday.
2) A strong cold front brings widespread rain and thunderstorm chances on Wednesday, followed by much cooler and showery conditions toward the end of the week.
DISCUSSION
KEY MESSAGE 1... Near record warmth with isolated strong to severe thunderstorms over the mountains today and Tuesday.
It's a very hot start to the workweek as upper level ridging strengthens over the region. After a little patchy fog to start, expect temperatures to quickly climb from the 60s this morning well into the upper 80s and low 90s this afternoon. This will mark one of the hottest days so far this season although even hotter conditions can be expected Tuesday as the upper level ridge peaks over the region.
Skies will trend mostly sunny to partly cloudy today with mostly dry conditions expected. The one exception will be over the Potomac Highlands and Alleghenies where showers and thunderstorms look to bubble later this afternoon into the early evening hours (2-8pm).
Storm coverage will be isolated in nature given the lack of a direct lifting mechanism. Hi-res CAMS show good continuity in regards to convective development that will be fueled by ample instability, steep low level lapse rates, and marginal shear. MLCAPE values of 1000-2000 J/kg, DCAPE values of 1000-1300 J/kg, and enough mid-level flow (20-30 kt) will provide some organization to any cold pools that develop. This supports forecast soundings with inverted V profiles indicative of damaging winds which aligns with several hi - res model members suggesting gusts of 40-50 kts on any storms that form. The corridor of concern appears to be from Petersburg/Elkins, WV northeastward toward Cumberland, MD/Martinsburg, WV. Any thunderstorm activity will quickly diminish through the evening hours with dry conditions and areas of patchy fog. Don't expect too much relief from the heat tonight with lows in the upper 60s and low 70s.
Even hotter conditions can be expected Tuesday with highs well into the low to mid 90s. A few upper 90s cannot be ruled out across the urban corridor and down to the south across the central VA Piedmont given the strengthened ridge peaking overhead and dry air at the surface. An isolated shower or t-storm remains possible over the mountains, although most will see nothing given the heightened ridge squashing anything overhead. Temperatures cool slightly Wednesday with increasing cloud cover as a cold front approaches the region.
Highs will still push into the 90s along with increasing humidity.
Even with that said, the combination of heat and humidity will remain below heat headline criteria through the period.
KEY MESSAGE 2...A strong cold front brings widespread rain and thunderstorm chances on Wednesday, followed by much cooler and showery conditions toward the end of the week.
A strong area of low pressure moves through the Northeast on Wednesday, with a cold front extending down the East Coast that will bring widespread rain and thunderstorm chances to the Mid-Atlantic in the afternoon/evening. While the center low will be well north of us, the timing of the front aligning with the diurnal cycle and the high temperatures seen at the start of the week could still contribute towards some thunderstorm development in the region.
Potential severity at this time still ranges widely--NCAR's AI NWP Convective Hazards Forecast currently has our region outlined in its 45%-60% probability for severe weather to occur, while CSU's medium- range probabilities ranks the severe threat much lower. Regardless, this front will likely result in widespread showers at a minimum as well as a sharp drop in temperatures seen later in the week. Highs on Thursday will range in the upper 60s and low 70s, a marked shift from the mid-90s expected earlier in the week. Lingering rain showers may still be moving out of the area by Thursday morning, while a meandering front to the south could bring a few additional rain showers on Friday.
Temperatures begin to increase again going into the weekend, as a warm front meanders through the region Saturday. Upper-level zonal flow slow transitions to UL ridging by the end of the weekend, indicating a potential decrease in rain chances going into the start of next week.
AVIATION /06Z MONDAY THROUGH FRIDAY/
VFR conditions are expected to continue across the terminals through Wednesday morning as high pressure strengthens offshore.
South/southwesterly winds return Monday and Tuesday gusting between 15 to 20 kts during the afternoon and evening hours. Daily shower and thunderstorm chances will occur each afternoon although coverage will be spotty in nature mainly at terminals along and west of a line from KMRB, KHGR, KFDK, to KEKN. Elsewhere confidence remains low given the lack of a lifting mechanism and strengthening high pressure overhead.
Sub-VFR restrictions return at times Wednesday afternoon and evening as a cold front brings widespread showers and thunderstorms to the region. Winds will remain out of the southwest ahead of the front before shifting back to the north and northwest Thursday. Some low CIGS may hang on through Wednesday night before lifting Thursday as the front sits south of the region. Periodic rain showers moving through the region on Thursday and Friday could bring additional sub- VFR periods at terminals towards the end of the week. Wind gusts could reach 15-20 knots on Thursday before gradually decreasing.
Northerly winds shift east-southeast by Friday night.
MARINE
Sub-SCA level winds continue through midday with SCA southerly channeling over the bay and lower tidal Potomac this afternoon and evening. Winds will drop briefly back below sub-SCA levels tonight before additional SCAs are needed due to channeling Tuesday afternoon and evening. Winds will remain out of the south and southwest with gusts up to 20 kts today and Tuesday.
Winds may near low-end SCA levels in south to southwesterly flow on Wednesday, and then again in northerly flow on Thursday. SMWs appear possible Wednesday into Wednesday night as thunderstorms move over the waters.
Small Craft Advisories are likely during the day Thursday & Friday as winds gust up to 15-20 knots, growing calmer overnight. Winds drop below SCA thresholds Friday night. Northerly winds shift easterly by Friday morning.
CLIMATE
Here are some daily temperature records during the May 18-20, 2026 timeframe:
A '+' sign indicates multiple years currently hold that record.
A '!' sign indicates the record is forecast to be tied or broken.
***MONDAY, MAY 18TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1877) 72F (2015)
Washington-Dulles (IAD) 91F (1987)! 68F (2015)! Baltimore (BWI) 97F (1962) 70F (2017)
Baltimore Inner Harbor (DMH) 97F (1962) 75F (2017)
Martinsburg (MRB) 96F (1911) 66F (2015)! Charlottesville (CHO) 95F (1962)+ 73F (1911)
Annapolis (NAK) 95F (1962)+ 69F (1953)+! Hagerstown (HGR) 93F (1962) 71F (2017)
***TUESDAY, MAY 19TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1997)+ 72F (2015)! Washington-Dulles (IAD) 92F (1997)+! 66F (2017)+! Baltimore (BWI) 98F (1962) 75F (1877)
Baltimore Inner Harbor (DMH) 98F (1962) 78F (1962)
Martinsburg (MRB) 98F (1911) 69F (1996)! Charlottesville (CHO) 97F (1962) 72F (1997)
Annapolis (NAK) 96F (1962) 71F (1911)! Hagerstown (HGR) 97F (1996) 69F (2017)+!
***WEDNESDAY, MAY 20TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1996) 73F (2019)
Washington-Dulles (IAD) 93F (1996) 69F (2019)
Baltimore (BWI) 95F (1962) 71F (2019)+ Baltimore Inner Harbor (DMH) 97F (1962) 74F (1998)+ Martinsburg (MRB) 97F (1911) 70F (1998)
Charlottesville (CHO) 96F (1996) 73F (1996)
Annapolis (NAK) 98F (1997) 76F (1898)
Hagerstown (HGR) 97F (1996) 66F (1998)
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory from 3 PM this afternoon to 2 AM EDT Tuesday for ANZ531>534-537>543.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 253 AM EDT Mon May 18 2026
WHAT HAS CHANGED
No major changes were made to the current forecast package. Very hot conditions today and Tuesday with widespread thunderstorm chances returning Wednesday.
KEY MESSAGES
1) Near record warmth with isolated strong to severe thunderstorms over the mountains today and Tuesday.
2) A strong cold front brings widespread rain and thunderstorm chances on Wednesday, followed by much cooler and showery conditions toward the end of the week.
DISCUSSION
KEY MESSAGE 1... Near record warmth with isolated strong to severe thunderstorms over the mountains today and Tuesday.
It's a very hot start to the workweek as upper level ridging strengthens over the region. After a little patchy fog to start, expect temperatures to quickly climb from the 60s this morning well into the upper 80s and low 90s this afternoon. This will mark one of the hottest days so far this season although even hotter conditions can be expected Tuesday as the upper level ridge peaks over the region.
Skies will trend mostly sunny to partly cloudy today with mostly dry conditions expected. The one exception will be over the Potomac Highlands and Alleghenies where showers and thunderstorms look to bubble later this afternoon into the early evening hours (2-8pm).
Storm coverage will be isolated in nature given the lack of a direct lifting mechanism. Hi-res CAMS show good continuity in regards to convective development that will be fueled by ample instability, steep low level lapse rates, and marginal shear. MLCAPE values of 1000-2000 J/kg, DCAPE values of 1000-1300 J/kg, and enough mid-level flow (20-30 kt) will provide some organization to any cold pools that develop. This supports forecast soundings with inverted V profiles indicative of damaging winds which aligns with several hi - res model members suggesting gusts of 40-50 kts on any storms that form. The corridor of concern appears to be from Petersburg/Elkins, WV northeastward toward Cumberland, MD/Martinsburg, WV. Any thunderstorm activity will quickly diminish through the evening hours with dry conditions and areas of patchy fog. Don't expect too much relief from the heat tonight with lows in the upper 60s and low 70s.
Even hotter conditions can be expected Tuesday with highs well into the low to mid 90s. A few upper 90s cannot be ruled out across the urban corridor and down to the south across the central VA Piedmont given the strengthened ridge peaking overhead and dry air at the surface. An isolated shower or t-storm remains possible over the mountains, although most will see nothing given the heightened ridge squashing anything overhead. Temperatures cool slightly Wednesday with increasing cloud cover as a cold front approaches the region.
Highs will still push into the 90s along with increasing humidity.
Even with that said, the combination of heat and humidity will remain below heat headline criteria through the period.
KEY MESSAGE 2...A strong cold front brings widespread rain and thunderstorm chances on Wednesday, followed by much cooler and showery conditions toward the end of the week.
A strong area of low pressure moves through the Northeast on Wednesday, with a cold front extending down the East Coast that will bring widespread rain and thunderstorm chances to the Mid-Atlantic in the afternoon/evening. While the center low will be well north of us, the timing of the front aligning with the diurnal cycle and the high temperatures seen at the start of the week could still contribute towards some thunderstorm development in the region.
Potential severity at this time still ranges widely--NCAR's AI NWP Convective Hazards Forecast currently has our region outlined in its 45%-60% probability for severe weather to occur, while CSU's medium- range probabilities ranks the severe threat much lower. Regardless, this front will likely result in widespread showers at a minimum as well as a sharp drop in temperatures seen later in the week. Highs on Thursday will range in the upper 60s and low 70s, a marked shift from the mid-90s expected earlier in the week. Lingering rain showers may still be moving out of the area by Thursday morning, while a meandering front to the south could bring a few additional rain showers on Friday.
Temperatures begin to increase again going into the weekend, as a warm front meanders through the region Saturday. Upper-level zonal flow slow transitions to UL ridging by the end of the weekend, indicating a potential decrease in rain chances going into the start of next week.
AVIATION /06Z MONDAY THROUGH FRIDAY/
VFR conditions are expected to continue across the terminals through Wednesday morning as high pressure strengthens offshore.
South/southwesterly winds return Monday and Tuesday gusting between 15 to 20 kts during the afternoon and evening hours. Daily shower and thunderstorm chances will occur each afternoon although coverage will be spotty in nature mainly at terminals along and west of a line from KMRB, KHGR, KFDK, to KEKN. Elsewhere confidence remains low given the lack of a lifting mechanism and strengthening high pressure overhead.
Sub-VFR restrictions return at times Wednesday afternoon and evening as a cold front brings widespread showers and thunderstorms to the region. Winds will remain out of the southwest ahead of the front before shifting back to the north and northwest Thursday. Some low CIGS may hang on through Wednesday night before lifting Thursday as the front sits south of the region. Periodic rain showers moving through the region on Thursday and Friday could bring additional sub- VFR periods at terminals towards the end of the week. Wind gusts could reach 15-20 knots on Thursday before gradually decreasing.
Northerly winds shift east-southeast by Friday night.
MARINE
Sub-SCA level winds continue through midday with SCA southerly channeling over the bay and lower tidal Potomac this afternoon and evening. Winds will drop briefly back below sub-SCA levels tonight before additional SCAs are needed due to channeling Tuesday afternoon and evening. Winds will remain out of the south and southwest with gusts up to 20 kts today and Tuesday.
Winds may near low-end SCA levels in south to southwesterly flow on Wednesday, and then again in northerly flow on Thursday. SMWs appear possible Wednesday into Wednesday night as thunderstorms move over the waters.
Small Craft Advisories are likely during the day Thursday & Friday as winds gust up to 15-20 knots, growing calmer overnight. Winds drop below SCA thresholds Friday night. Northerly winds shift easterly by Friday morning.
CLIMATE
Here are some daily temperature records during the May 18-20, 2026 timeframe:
A '+' sign indicates multiple years currently hold that record.
A '!' sign indicates the record is forecast to be tied or broken.
***MONDAY, MAY 18TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1877) 72F (2015)
Washington-Dulles (IAD) 91F (1987)! 68F (2015)! Baltimore (BWI) 97F (1962) 70F (2017)
Baltimore Inner Harbor (DMH) 97F (1962) 75F (2017)
Martinsburg (MRB) 96F (1911) 66F (2015)! Charlottesville (CHO) 95F (1962)+ 73F (1911)
Annapolis (NAK) 95F (1962)+ 69F (1953)+! Hagerstown (HGR) 93F (1962) 71F (2017)
***TUESDAY, MAY 19TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1997)+ 72F (2015)! Washington-Dulles (IAD) 92F (1997)+! 66F (2017)+! Baltimore (BWI) 98F (1962) 75F (1877)
Baltimore Inner Harbor (DMH) 98F (1962) 78F (1962)
Martinsburg (MRB) 98F (1911) 69F (1996)! Charlottesville (CHO) 97F (1962) 72F (1997)
Annapolis (NAK) 96F (1962) 71F (1911)! Hagerstown (HGR) 97F (1996) 69F (2017)+!
***WEDNESDAY, MAY 20TH, 2026*** LOCATION RECORD HIGH (YEAR) RECORD WARM LOW (YEAR)
Washington-National (DCA) 96F (1996) 73F (2019)
Washington-Dulles (IAD) 93F (1996) 69F (2019)
Baltimore (BWI) 95F (1962) 71F (2019)+ Baltimore Inner Harbor (DMH) 97F (1962) 74F (1998)+ Martinsburg (MRB) 97F (1911) 70F (1998)
Charlottesville (CHO) 96F (1996) 73F (1996)
Annapolis (NAK) 98F (1997) 76F (1898)
Hagerstown (HGR) 97F (1996) 66F (1998)
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory from 3 PM this afternoon to 2 AM EDT Tuesday for ANZ531>534-537>543.
Wind History for Cove Point LNG Pier, MD
toggle option: (graph/table)
Link to 1 hour of 5 minute data for K2W6
Terminal Aerodrome Forecast (TAF) for K2W6
Wind History Graph: 2W6
(wind in knots)
GEOS Local Image of Mid-Atlantic
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