Marine Weather and Tide Forecast for Cambridge, MD

NEAR TERM /THROUGH FRIDAY/
Weak high pressure continues over the region as temps warm well into the upper 80's to the lower 90s across the region. PHL has reached 90F for the first time since August 28, 2024. Surface moisture has been increasing with the light westerly winds as dew points have pushed into the low to mid 60s. Day Cloud Phase Satellite imagery is showing some a narrow range of CU developing along and south of a slow moving frontal boundary draped across portions of northern PA into NY. Thus far as of 2pm, the updrafts haven't been strong enough to see any glaciation in the clouds so there's been no threat of thunder as of yet. Surface convergence has been minimal so while instability has been increasing and there's decent bulk shear, the threat of any lightning thus far as been almost non existent. Will continue to mention a slight chance of thunderstorms for portions of northern NJ and PA and if any showers can develop they could bring some locally moderate rainfall along with gusty winds.

By the overnight hours, diurnal instability will wane rapidly and any showers/thunderstorms will quickly come to an end. Temps should moderate a bit overnight however most areas will stay in the low 70s until just before daybreak as a weak cold front slowly moves through across the region.

Weak high pressure moves over the area tomorrow as the front becomes stationary over the Mid Atlantic. We'll see an area of low pressure approach on Friday increasing the chances for rainfall and some isolated thunderstorms however the more expansive chances will be coming Friday evening into Saturday.
Temps will be warming into the upper 70s to low 80s for the areas along the shore and for the higher terrain of the Poconos.
For the urban corridor, temps will warm again into the mid to possibly upper 80s.

SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/
Low pressure will be advancing along the aforementioned stationary boundary Friday night rapidly increasing the potential for showers through Saturday morning with the passage of the low. After the low departs late Saturday morning, the stationary front over the Mid- Atlantic lifts north as a warm front as low pressure moves into the Great Lakes. Some shortwave energy ahead of that low moves into the northern half of the forecast area. With surface dew points rising through the 60s and approaching 70, another round of showers and thunderstorms is possible late in the day. PoPs will mostly be chance, but PoPs will be likely for portions of the southern Poconos and western Lehigh Valley. The threat for severe weather is minimal, but with increasing dew points and PWATs over 1.5 inches for most of the area, and over 2 inches for Delmarva, locally heavy rain is a threat. This is an overall weakly forced event so while there is moderate confidence in the pattern, the specific details of where it will shower and how much rain will fall will be subject to change.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/
Low pressure approaches from the west and slowly works its way through the Mid-Atlantic and Delmarva Sunday through Monday. A prolonged period of unsettled weather is on tap during this time with showers and isolated to scattered thunderstorms. Given abundant low level moisture with surface dew points well in the 60s, locally heavy rain will develop from time to time. WPC has a Marginal Risk (1 out of 4) for excessive rain Saturday night through Sunday and again Sunday through Sunday night. Rain tapers off on Monday as low pressure departs. With a prolonged period of onshore flow, temperatures will be on the cool side through the weekend and into Monday with highs on Sunday in the low to mid 70s and highs on Monday in the upper 60s to low 70s.

Several additional shortwaves approach from the west as the week progresses, and weak waves of low pressure will develop as a result. This will keep low chance PoPs in the forecast through Wednesday. Temperatures will rebound somewhat on Tuesday before warming back into the 80s on Wednesday. After multiple cloudy days, a return of sunshine should be anticipated on Wednesday as well.

AVIATION /00Z FRIDAY THROUGH TUESDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Tonight...VFR with spotty SHRA/TSRA dwindling early. Winds west-southwest 5-10 kts this evening becoming north or northeasterly overnight. High confid overall.

Friday...VFR mainly, but scattered SHRA with brief sub- VFR conds possible. Winds northeasterly becoming easterly 5-10 kts.
Moderate confid.

Outlook...

Friday night through Saturday...Prevailing MVFR to IFR likely, mainly from low ceilings. SHRA and scattered TSRA. A break in SHRA possible around midday Saturday before ramping up again Saturday afternoon.

Saturday night through Monday...Prevailing MVFR to IFR likely, mainly from low ceilings. SHRA and scattered TSRA.

MARINE
High pressure offshore and a cold front approaching from the North/Northwest later today and tonight. Winds will remain below SCA levels as winds come in from the West/Southwest today and early tonight. After that, winds across the northern waters will turn North/Northeast into the evening and this wins shift will trend southward thru the night. Fair weather overall, but a stray shower across the far northern waters possible this evening. Low confid regarding shower activity.

Outlook...

Friday through Monday...Overall, sub-SCA conditions expected, though there is the potential for SCA conditions Sunday night through Monday. VSBY restrictions in showers, drizzle, and isolated to scattered thunderstorms throughout this period.
Areas of fog also possible.

Rip Currents...

For Friday, east- northeast winds around 5-10 mph turn more easterly in the afternoon. Breaking wave heights remain around 1-3 feet with a weak southeasterly swell of 1 foot around 9 seconds. There will be a LOW risk for dangerous rip currents at all beaches.

For Saturday, weak southerly winds in the morning will transition to northeasterly in the afternoon and increase to around 10 mph. Breaking wave heights remain around 1-3 feet with a continued weak southeasterly swell around 1 foot at 9-10 seconds in length. Will maintain a LOW risk for dangerous rip currents at all beaches.

For Saturday,

For specific beach forecasts, visit weather.gov/beach/phi

PHI WATCHES/WARNINGS/ADVISORIES
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...None.