Marine Weather and Tide Forecast for Chester, PA

NEAR TERM /THROUGH SATURDAY/
Very warm day ongoing as modest southwesterly flow and warm air advection has set up with high pressure offshore and an area of low pressure moving into the Great Lakes. The region gets even warmer tomorrow with a warm front lifting through later today into tonight.
Not much else going on through the afternoon other than some passing high clouds ahead of the next system.

For tonight, cloud cover increases which will keep things on the milder side, in addition to the passing warm front. Temperatures won't drop much and lows will end up much warmer compared to previous nights. A very mild night overall with lows in the upper 50s/low 60s.

For tomorrow, while skies will be partly to mostly cloudy, temperatures will soar into the low to mid 80s. Gradient remains tight, which will result in a southwesterly breeze and gusts 20-30 MPH or so. A cold front approaches late in the day, which could touch off a few showers and isolated thunderstorms, mainly in the Lehigh Valley and Poconos, though not expecting any severe weather.

SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/
Some potential will remain for a passing shower or thundershower tomorrow evening across the Lehigh Valley northward, but most of the area should remain dry. A cold front will pass through during the overnight hours, bringing northwesterly wind and cooler temperatures. Temperatures Sunday morning look to be mostly in the 50s and 60s, with not a lot of warming through the day. All-in-all, temperatures Sunday still look to be 10-15 degrees colder than on Saturday.

High pressure should briefly settle into the region through Monday with periods of mixed clouds and sun and continued cooler temperatures (though close to normal for this time of year).

Monday night, another low pressure system will pass to our north with the associated trailing cold front passing through our area. As it stands right now, this system looks a little more likely to bring rain showers (and perhaps a rumble of thunder) with chance PoPs areawide.

LONG TERM /TUESDAY THROUGH THURSDAY/
Some showers could linger into the day on Tuesday, but once any showers depart the area, conditions through Thursday look to feature surface high pressure with dry and warm conditions (lows in the 40s and 50s, highs generally in the 70s). Rain chances look minimal through this time period.

Towards the end of the week, there are indications that mid-level ridging over the Northeast will begin to break down, potentially allowing a more active upper-level pattern to take shape. This could lead to increasing rain and perhaps thunderstorm chances across the area for Friday and beyond.

AVIATION /18Z FRIDAY THROUGH WEDNESDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Rest of Today...VFR. South/southwest winds 10-15 kt gusting 20-25 kt. High confidence.

Tonight...VFR. South/Southwest winds around 10-15 kt. Period of LLWS expected overnight with a brisk 40-45 kt southwesterly low-level jet moving overhead. High confidence.

Saturday...VFR. Southwest winds 10-15 kt, gusting 20-25 kt. High confidence.

Outlook...

Saturday night...Mainly VFR. Brief periods of sub-VFR conditions can't be ruled out in the evening for northwestern terminals in isolated showers.

Sunday through Monday...VFR. No significant weather expected.

Monday night...Periods of sub-VFR conditions are possible in scattered showers.

Tuesday...Periods of sub-VFR conditions possible in lingering showers early. Otherwise, VFR with no significant weather expected.

Wednesday...VFR. No significant weather expected.

MARINE
A Small Craft Advisory is in effect for all ocean zones through 06Z Sunday, and for the Delaware Bay through 00Z. Southwesterly gusts 25-30 kt and seas 4 to 7 feet are expected.

Outlook...

Sunday through Monday...Sub-SCA conditions expected.

Monday night into Tuesday...A cold frontal passage will bring gusty winds and elevated seas, but for now it appears that conditions will remain below SCA criteria.

Wednesday...Sub-SCA conditions expected.

FIRE WEATHER
On Saturday, Min RH values will be 40 to 45 percent with SW winds 15 to 20 mph with 25 to 30 mph gusts. On Sunday, Min RH values will be 30 to 35 percent with NW winds 10 to 15 mph with gusts up to 20 mph.

PHI WATCHES/WARNINGS/ADVISORIES
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 6 PM EDT Saturday for ANZ430-431.
Small Craft Advisory until 2 AM EDT Sunday for ANZ450>455.