Marine Weather and Tide Forecast for Olney, MD
April 28, 2024 7:19 PM EDT (23:19 UTC) Change Location
 | Sunrise 6:11 AM Sunset 8:00 PM Moonrise 12:00 AM Moonset 8:03 AM |
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 700 Pm Edt Sun Apr 28 2024
Tonight - S winds 5 kt. Waves less than 1 ft.
Mon - SW winds around 5 kt. Waves 1 ft.
Mon night - S winds 5 kt. Waves less than 1 ft.
Tue - SW winds 5 to 10 kt. Waves 1 ft.
Tue night - W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Wed - NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Wed night - NE winds 5 to 10 kt. Waves 1 ft.
Thu - SE winds 5 to 10 kt. Waves 1 ft.
Fri - S winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.
winds and waves higher and visibilities lower in and near tstms.
winds and waves higher and visibilities lower in and near tstms.
ANZ500 700 Pm Edt Sun Apr 28 2024
Synopsis for the tidal potomac and md portion of the chesapeake bay -
high pressure building across the area through Monday will bring very warm temperatures and dry conditions. A cold front crosses the waters Tuesday into Wednesday bringing chances for showers and Thunderstorms. High pressure briefly returns Thursday before another front crosses later in the workweek. Small craft advisories may be needed at times through Tuesday.
high pressure building across the area through Monday will bring very warm temperatures and dry conditions. A cold front crosses the waters Tuesday into Wednesday bringing chances for showers and Thunderstorms. High pressure briefly returns Thursday before another front crosses later in the workweek. Small craft advisories may be needed at times through Tuesday.
Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 281859 AFDLWX
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 259 PM EDT Sun Apr 28 2024
SYNOPSIS
Very warm temperatures for late April are expected today through Tuesday as high pressure sits off the Mid-Atlantic coast. Shower and thunderstorm chances return Tuesday afternoon and again Wednesday as a cold front crosses the region. High pressure briefly returns Thursday before another front arrives late week and into the weekend with additional afternoon showers and thunderstorms.
NEAR TERM /UNTIL 7 AM MONDAY MORNING/
Despite the slow erosion of this morning's shallow inversion, temperatures have warmed quite nicely under sunny to mostly sunny skies. It's a tease to Summer with temperatures running 20 to 30 degrees warmer from this time yesterday. Strong upper level ridging combined with surface high pressure off the coastal Carolinas are responsible for the quick change in weather conditions. With the surface high offshore, an ample supply of south to southwesterly flow will boost temperatures well into the low to mid 80s across much of the region. Mountain locations and areas right near the water will see highs in the 70s. Dry conditions will prevail with building heights although an isolated shower or thunderstorm cannot be ruled out over the higher peaks of the Potomac/Allegheny Highlands region. This activity will be short lived given the lack of shear, lower dewpoint/humidity values, and forcing across the region.
Skies will remain mostly clear to partly cloudy tonight with areas of patchy dense fog in particularly over the river valleys along and west of the Blue Ridge. Expect a mild night with lows in the upper 50s and low to mid 60s areawide.
SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/
The strong upper level ridge continues to strengthen Monday as surface high pressure drifts further off the southeast U.S coast.
This will yield a continuation of dry conditions and perhaps the first 90 degree day of the year in many locations across the region.
Afternoon highs will reach into the mid to upper 80s for most with lower 90s along the I-95 corridor south into the central VA Piedmont. An isolated thunderstorm cannot be ruled out over the mountains with chances less than 20 percent given a capping inversion overhead. Mild conditions will continue Monday night with lows remaining mild in the low to mid 60s.
Changes look to arrive Tuesday as the ridge begins to buckle. An upper level trough and associated cold front look to push in from the Great Lakes and Ohio River Valley Tuesday afternoon and evening bringing renewed chances for showers and thunderstorms. A few of these storms could be strong to severe although the chance for widespread severe weather appears limited. This is due in part to weak 0-6 km deep layer shear at 30 kts or less and lower dewpoint values in the upper 50s and lows 60s. SPC currently keeps the area in general thunder while the CSU learning probabilities highlight areas east of the Blue Ridge for 15-30 percent probabilities for a marginal risk of severe weather. With all that said, any storms that do develop will be capable of producing frequent lightning gusty winds, and locally heavy rainfall (PWATS running 1-1.5"). High temperatures Tuesday will push back into the mid to upper 80s with 70s over the mountains/near the bay.
Shower and thunderstorm activity will gradually diminish in the wake of the front Tuesday evening into Tuesday night.
Temperatures will fall back into the upper 50s and low 60s with the front sitting south and east of the region. Areas of patChy dense fog are also possible especially in areas that do see the rain.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
The front will still be progressing south through the area Wednesday while a shortwave trough aloft passes to the south. A chance of showers and perhaps even thunderstorms will linger depending on the timing of these features. While temperatures will trend downward, they will still remain around 10 degrees above normal, in the upper 70s and lower 80s. High pressure will be building southward from New England Wednesday night with slightly cooler lows in the 50s.
Upper level ridging will build over the area Thursday, promoting dry conditions. With the high progressing southward and low pressure approaching the western Great Lakes, the warm sector will quickly be established and temperatures will remain 5-10 degrees above normal.
The Great Lakes system will be on more of a northern trajectory as a trough ejects through the northern Plains. As a result, chances for rain have slowed for Friday, with a chance for a few showers and storms mainly confined to the mountains. The trailing front will eventually reach the area Saturday or Saturday night. The highest chance for showers will be during this period. While thunderstorms will be possible, instability will likely be fairly limited.
There remains enough ensemble spread in frontal/trough timing that a chance for showers lingers into Sunday. Even if we are solidly by that time, temperatures are forecast to remain above normal as a zonal flow is in place aloft.
AVIATION /19Z SUNDAY THROUGH FRIDAY/
VFR conditions are expected at all TAF terminals through the valid TAF period. Some diurnal strato-cumulus can be expected this afternoon and again Monday between 5-7kft. Outside of the passing mid and high level clouds there remains the potential for valley fog overnight into Monday morning. The highest confidence for fog looks to occur at KMRB, KSHD, and KCHO due to their proximity to bodies of water. Some fog is also possible at KIAD and KBWI/KMTN, but for now left out due to confidence. Winds will remain light out of the south and southwest at 5-10 knots through Monday afternoon before switching to the west and southwest heading into Tuesday.
The next chance for sub-VFR conditions arrives with a cold front Tuesday afternoon and evening. This front will bring renewed chances for scattered showers and thunderstorms. The strongest storms will be capable of producing wind gusts over 35 knots, frequent lightning, and brief vsby reductions from locally heavy rainfall.
Any shower or thunderstorm activity moves east of the area late Tuesday evening into Tuesday night.
A few showers and thunderstorms remain possible Wednesday as an additional weak cold front slowly pushes through the area. Otherwise VFR conditions will continue through Thursday.
MARINE
Favorable marine conditions are expected through Monday night as high pressure brings warm and dry conditions to the waters. WInds will remain out of the south and west today at 5-10 knots before turning to the west and southwest Monday.
A cold front is set to cross the local waters Tuesday afternoon and evening bringing scattered showers and thunderstorms. These storms will be capable of producing wind gusts of 35+ knots, frequent lightning, and locally heavy rainfall. Special Marine Warnings may be needed as these storms cross the waters Tuesday afternoon.
Showers and thunderstorms push east of the waters Tuesday evening into Tuesday night. Winds will turn back toward the northwest at this point, but should remain below SCA levels during this time.
Northwest winds may come close to SCA criteria Wednesday as a cold front pushes to the south. A thunderstorm is also possible. Winds will become southerly again Thursday and Friday. Marginal SCA conditions could occur in channeling on the bay in the evening/overnight each day.
TIDES/COASTAL FLOODING
No further tidal flooding is expected over the next several high tide cycles. A few sites could flirt with action stage Monday morning under light south to southwesterly flow. It's not until Tuesday when tidal levels get close to minor thresholds.
CLIMATE
Near-record to record warmth is possible on Monday afternoon.
Below is a list of record high temperatures for April 29th, and the year the record was set.
Apr 29th Climate Site Record High Forecast High Washington-National (DCA) 91F (2017+) 91F Washington-Dulles (IAD) 89F (2017) 89F Baltimore (BWI) 91F (1951) 89F Martinsburg (MRB) 93F (1974) 86F Charlottesville (CHO)* 92F (1974) 89F Hagerstown (HGR)* 90F (1974) 86F Annapolis (NAK)* 92F (1974) 83F
+ denotes that multiple years reached this value, but the depicted year is the most recent * denotes sites where Record Event Reports (RERs) are not issued
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 259 PM EDT Sun Apr 28 2024
SYNOPSIS
Very warm temperatures for late April are expected today through Tuesday as high pressure sits off the Mid-Atlantic coast. Shower and thunderstorm chances return Tuesday afternoon and again Wednesday as a cold front crosses the region. High pressure briefly returns Thursday before another front arrives late week and into the weekend with additional afternoon showers and thunderstorms.
NEAR TERM /UNTIL 7 AM MONDAY MORNING/
Despite the slow erosion of this morning's shallow inversion, temperatures have warmed quite nicely under sunny to mostly sunny skies. It's a tease to Summer with temperatures running 20 to 30 degrees warmer from this time yesterday. Strong upper level ridging combined with surface high pressure off the coastal Carolinas are responsible for the quick change in weather conditions. With the surface high offshore, an ample supply of south to southwesterly flow will boost temperatures well into the low to mid 80s across much of the region. Mountain locations and areas right near the water will see highs in the 70s. Dry conditions will prevail with building heights although an isolated shower or thunderstorm cannot be ruled out over the higher peaks of the Potomac/Allegheny Highlands region. This activity will be short lived given the lack of shear, lower dewpoint/humidity values, and forcing across the region.
Skies will remain mostly clear to partly cloudy tonight with areas of patchy dense fog in particularly over the river valleys along and west of the Blue Ridge. Expect a mild night with lows in the upper 50s and low to mid 60s areawide.
SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/
The strong upper level ridge continues to strengthen Monday as surface high pressure drifts further off the southeast U.S coast.
This will yield a continuation of dry conditions and perhaps the first 90 degree day of the year in many locations across the region.
Afternoon highs will reach into the mid to upper 80s for most with lower 90s along the I-95 corridor south into the central VA Piedmont. An isolated thunderstorm cannot be ruled out over the mountains with chances less than 20 percent given a capping inversion overhead. Mild conditions will continue Monday night with lows remaining mild in the low to mid 60s.
Changes look to arrive Tuesday as the ridge begins to buckle. An upper level trough and associated cold front look to push in from the Great Lakes and Ohio River Valley Tuesday afternoon and evening bringing renewed chances for showers and thunderstorms. A few of these storms could be strong to severe although the chance for widespread severe weather appears limited. This is due in part to weak 0-6 km deep layer shear at 30 kts or less and lower dewpoint values in the upper 50s and lows 60s. SPC currently keeps the area in general thunder while the CSU learning probabilities highlight areas east of the Blue Ridge for 15-30 percent probabilities for a marginal risk of severe weather. With all that said, any storms that do develop will be capable of producing frequent lightning gusty winds, and locally heavy rainfall (PWATS running 1-1.5"). High temperatures Tuesday will push back into the mid to upper 80s with 70s over the mountains/near the bay.
Shower and thunderstorm activity will gradually diminish in the wake of the front Tuesday evening into Tuesday night.
Temperatures will fall back into the upper 50s and low 60s with the front sitting south and east of the region. Areas of patChy dense fog are also possible especially in areas that do see the rain.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
The front will still be progressing south through the area Wednesday while a shortwave trough aloft passes to the south. A chance of showers and perhaps even thunderstorms will linger depending on the timing of these features. While temperatures will trend downward, they will still remain around 10 degrees above normal, in the upper 70s and lower 80s. High pressure will be building southward from New England Wednesday night with slightly cooler lows in the 50s.
Upper level ridging will build over the area Thursday, promoting dry conditions. With the high progressing southward and low pressure approaching the western Great Lakes, the warm sector will quickly be established and temperatures will remain 5-10 degrees above normal.
The Great Lakes system will be on more of a northern trajectory as a trough ejects through the northern Plains. As a result, chances for rain have slowed for Friday, with a chance for a few showers and storms mainly confined to the mountains. The trailing front will eventually reach the area Saturday or Saturday night. The highest chance for showers will be during this period. While thunderstorms will be possible, instability will likely be fairly limited.
There remains enough ensemble spread in frontal/trough timing that a chance for showers lingers into Sunday. Even if we are solidly by that time, temperatures are forecast to remain above normal as a zonal flow is in place aloft.
AVIATION /19Z SUNDAY THROUGH FRIDAY/
VFR conditions are expected at all TAF terminals through the valid TAF period. Some diurnal strato-cumulus can be expected this afternoon and again Monday between 5-7kft. Outside of the passing mid and high level clouds there remains the potential for valley fog overnight into Monday morning. The highest confidence for fog looks to occur at KMRB, KSHD, and KCHO due to their proximity to bodies of water. Some fog is also possible at KIAD and KBWI/KMTN, but for now left out due to confidence. Winds will remain light out of the south and southwest at 5-10 knots through Monday afternoon before switching to the west and southwest heading into Tuesday.
The next chance for sub-VFR conditions arrives with a cold front Tuesday afternoon and evening. This front will bring renewed chances for scattered showers and thunderstorms. The strongest storms will be capable of producing wind gusts over 35 knots, frequent lightning, and brief vsby reductions from locally heavy rainfall.
Any shower or thunderstorm activity moves east of the area late Tuesday evening into Tuesday night.
A few showers and thunderstorms remain possible Wednesday as an additional weak cold front slowly pushes through the area. Otherwise VFR conditions will continue through Thursday.
MARINE
Favorable marine conditions are expected through Monday night as high pressure brings warm and dry conditions to the waters. WInds will remain out of the south and west today at 5-10 knots before turning to the west and southwest Monday.
A cold front is set to cross the local waters Tuesday afternoon and evening bringing scattered showers and thunderstorms. These storms will be capable of producing wind gusts of 35+ knots, frequent lightning, and locally heavy rainfall. Special Marine Warnings may be needed as these storms cross the waters Tuesday afternoon.
Showers and thunderstorms push east of the waters Tuesday evening into Tuesday night. Winds will turn back toward the northwest at this point, but should remain below SCA levels during this time.
Northwest winds may come close to SCA criteria Wednesday as a cold front pushes to the south. A thunderstorm is also possible. Winds will become southerly again Thursday and Friday. Marginal SCA conditions could occur in channeling on the bay in the evening/overnight each day.
TIDES/COASTAL FLOODING
No further tidal flooding is expected over the next several high tide cycles. A few sites could flirt with action stage Monday morning under light south to southwesterly flow. It's not until Tuesday when tidal levels get close to minor thresholds.
CLIMATE
Near-record to record warmth is possible on Monday afternoon.
Below is a list of record high temperatures for April 29th, and the year the record was set.
Apr 29th Climate Site Record High Forecast High Washington-National (DCA) 91F (2017+) 91F Washington-Dulles (IAD) 89F (2017) 89F Baltimore (BWI) 91F (1951) 89F Martinsburg (MRB) 93F (1974) 86F Charlottesville (CHO)* 92F (1974) 89F Hagerstown (HGR)* 90F (1974) 86F Annapolis (NAK)* 92F (1974) 83F
+ denotes that multiple years reached this value, but the depicted year is the most recent * denotes sites where Record Event Reports (RERs) are not issued
LWX WATCHES/WARNINGS/ADVISORIES
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| WASD2 - 8594900 - Washington, DC | 19 mi | 50 min | S 8G | 77°F | 64°F | 30.06 | ||
| BLTM2 - 8574680 - Baltimore, MD | 27 mi | 50 min | SSE 2.9G | 76°F | 60°F | |||
| CBCM2 | 29 mi | 50 min | SE 8.9G | 71°F | 61°F | 30.04 | 61°F | |
| FSKM2 - 8574728 - Francis Scott Key Bridge, MD | 29 mi | 50 min | SE 7G | 74°F | ||||
| BSLM2 - Chesapeake Bay, MD | 32 mi | 50 min | S 5.1 | 83°F | 30.06 | 60°F | ||
| APAM2 - 8575512 - Annapolis, MD | 33 mi | 50 min | SE 2.9G | 73°F | 65°F | 30.06 | ||
| 44063 - Annapolis | 35 mi | 44 min | S 9.7G | 64°F | 61°F | 1 ft | ||
| 44043 - Patapsco, MD | 36 mi | 44 min | S 14G | 66°F | 61°F | 1 ft | ||
| CPVM2 | 38 mi | 50 min | 65°F | 62°F | ||||
| TPLM2 - Thomas Point, MD | 38 mi | 80 min | SSE 9.9G | 64°F | 30.10 | |||
| TCBM2 - 8573364 - Tolchester Beach, MD | 44 mi | 50 min | SSW 7G | 30.07 |
toggle option: (graph/table)
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 |
| KGAI MONTGOMERY COUNTY AIRPARK,MD | 5 sm | 23 min | var 05 | 10 sm | Clear | 81°F | 61°F | 51% | 30.08 | |
| KCGS COLLEGE PARK,MD | 14 sm | 29 min | S 08 | 10 sm | Clear | 82°F | 59°F | 45% | 30.06 | |
| KFME TIPTON,MD | 17 sm | 30 min | SW 06 | 10 sm | Clear | 79°F | 59°F | 51% | 30.08 | |
| KBWI BALTIMORE/WASHINGTON INTL THURGOOD MARSHALL,MD | 21 sm | 25 min | SW 06 | 10 sm | Mostly Cloudy | 82°F | 57°F | 42% | 30.05 | |
| KDCA RONALD REAGAN WASHINGTON NATIONAL,VA | 21 sm | 27 min | S 09 | 10 sm | Partly Cloudy | 79°F | 61°F | 54% | 30.05 |
Chain Bridge
Click for Map
Sun -- 12:06 AM EDT 2.83 feet High Tide
Sun -- 12:12 AM EDT Moonrise
Sun -- 06:13 AM EDT Sunrise
Sun -- 06:18 AM EDT 0.60 feet Low Tide
Sun -- 09:03 AM EDT Moonset
Sun -- 12:03 PM EDT 3.41 feet High Tide
Sun -- 07:27 PM EDT 0.51 feet Low Tide
Sun -- 07:58 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:06 AM EDT 2.83 feet High Tide
Sun -- 12:12 AM EDT Moonrise
Sun -- 06:13 AM EDT Sunrise
Sun -- 06:18 AM EDT 0.60 feet Low Tide
Sun -- 09:03 AM EDT Moonset
Sun -- 12:03 PM EDT 3.41 feet High Tide
Sun -- 07:27 PM EDT 0.51 feet Low Tide
Sun -- 07:58 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Chain Bridge, D.C., Tide feet
| 12 am |
| 2.8 |
| 1 am |
| 2.7 |
| 2 am |
| 2.3 |
| 3 am |
| 1.8 |
| 4 am |
| 1.2 |
| 5 am |
| 0.8 |
| 6 am |
| 0.6 |
| 7 am |
| 0.7 |
| 8 am |
| 1 |
| 9 am |
| 1.6 |
| 10 am |
| 2.5 |
| 11 am |
| 3.2 |
| 12 pm |
| 3.4 |
| 1 pm |
| 3.2 |
| 2 pm |
| 2.8 |
| 3 pm |
| 2.2 |
| 4 pm |
| 1.6 |
| 5 pm |
| 1.1 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.5 |
| 8 pm |
| 0.5 |
| 9 pm |
| 0.9 |
| 10 pm |
| 1.5 |
| 11 pm |
| 2.3 |
Chain Bridge
Click for Map
Sun -- 12:01 AM EDT 2.83 feet High Tide
Sun -- 12:12 AM EDT Moonrise
Sun -- 06:13 AM EDT 0.60 feet Low Tide
Sun -- 06:13 AM EDT Sunrise
Sun -- 09:03 AM EDT Moonset
Sun -- 11:58 AM EDT 3.41 feet High Tide
Sun -- 07:22 PM EDT 0.51 feet Low Tide
Sun -- 07:58 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:01 AM EDT 2.83 feet High Tide
Sun -- 12:12 AM EDT Moonrise
Sun -- 06:13 AM EDT 0.60 feet Low Tide
Sun -- 06:13 AM EDT Sunrise
Sun -- 09:03 AM EDT Moonset
Sun -- 11:58 AM EDT 3.41 feet High Tide
Sun -- 07:22 PM EDT 0.51 feet Low Tide
Sun -- 07:58 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Chain Bridge, one mile below, D.C., Tide feet
| 12 am |
| 2.8 |
| 1 am |
| 2.7 |
| 2 am |
| 2.3 |
| 3 am |
| 1.7 |
| 4 am |
| 1.2 |
| 5 am |
| 0.8 |
| 6 am |
| 0.6 |
| 7 am |
| 0.7 |
| 8 am |
| 1 |
| 9 am |
| 1.7 |
| 10 am |
| 2.6 |
| 11 am |
| 3.2 |
| 12 pm |
| 3.4 |
| 1 pm |
| 3.2 |
| 2 pm |
| 2.7 |
| 3 pm |
| 2.1 |
| 4 pm |
| 1.5 |
| 5 pm |
| 1.1 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.5 |
| 8 pm |
| 0.6 |
| 9 pm |
| 0.9 |
| 10 pm |
| 1.6 |
| 11 pm |
| 2.3 |
Sterling, VA,
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