Sunrise 6:11 AM   Sunset 7:52 PM Moonrise 8:59 PM   Moonset 5:50 AM

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ANZ539 Chester River To Queenstown Md- 434 Am Edt Thu Apr 25 2024
.small craft advisory in effect until 9 am edt this morning - .
Rest of the overnight - NE winds 15 kt with gusts to 20 kt. Waves 2 ft. Scattered sprinkles. Today - NE winds 10 to 15 kt with gusts to 20 kt - . Diminishing to 5 kt late. Waves 1 to 2 ft. Tonight - E winds 5 to 10 kt. Waves 1 ft. Fri - E winds 5 to 10 kt. Waves 1 ft. Fri night - SE winds 5 to 10 kt. Waves 1 ft. Sat - SE winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. Sat night - S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Sun - S winds 5 to 10 kt. Waves 1 ft. Mon - S winds 5 to 10 kt. Waves 1 ft.

ANZ500 434 Am Edt Thu Apr 25 2024
Synopsis for the tidal potomac and md portion of the chesapeake bay -
high pressure will build across the region for the end of the week, then move offshore over the weekend. Small craft advisories will likely be needed both Friday and Saturday afternoons.

FXUS61 KPHI 250837 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 437 AM EDT Thu Apr 25 2024

SYNOPSIS
High pressure arrives from the Great Lakes today before shifting to our northeast and east on Friday. A warm front should lift north of our area later Saturday, then a cold front gradually approaches later Monday before moving across our area later Tuesday.

NEAR TERM /THROUGH TONIGHT/
Latest analysis shows the cold front has cleared the region, but winds being relatively weak behind the front plus some lingering clouds, temps have been slow to drop. Have trimmed back to the freeze warning to a frost advisory for a large segment, but for now have left the inherited frost advisory.

Weak shortwave passing by this morning likely keeps some clouds around from Philly on southward for a good chunk of the day, and in fact there could be a stray shower, most likely over the Delmarva but a small chance even in southern NJ. Looks like any showers would end before noon, and we should gradually start to dry out and clear out more late in the day. While the cold advection has lagged, still expect today to be notably cooler than yesterday, with highs mostly in the 50s.

High pressure builds to the north tonight with the gradient slacking off enough. With drier air in place by then along with clear skies, expect radiational cooling to maximize. Thus, have leaned hard on the colder guidance and issued a freeze watch for a large chunk of the region especially north and east of Philadelphia. Areas further south and west look more tricky but still likely need frost advisories for these areas. Lows overall in the 30s, with near or below 30 in the Freeze Watch area and Poconos but closer to mid 30s in the urban centers and Delmarva.

SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/
An upper-level trough is forecast to shift to our east to start Friday, allowing high pressure to build across New England and the Mid Atlantic. After a cold start Friday morning, surface flow shifts south- southeast by the afternoon to allow some warming to begin. With mostly clear skies, high temps in the afternoon should reach low 60s inland. Onshore flow, however, will help keep the coastal communities and adjacent inland locations in the mid to upper 50s during the afternoon. Calm winds and clear skies to start the nighttime hours will aid in cooling, but increasing clouds overnight will help stave off runaway radiational cooling. We will still see temperatures dip into the mid 30s to low 40s with patchy frost possible in the most sheltered areas.

High pressure shifts offshore Saturday with an approaching warm front, expected to arrive around the evening timeframe. Winds will become more southerly with return flow of our offshore high aiding in the warm air advection we can expect as the warm front pushes through. That said, the increased cloud coverage will prevent us from warming up too much, with afternoon highs expected to reach the upper 50 to low 60s, right around or just warmer than on Friday. While a few showers cannot be ruled out with this warm front probabilities and coverage remain rather minimal with the only mentionable POPs north and west of I-78.
Warmer overnight with the warm front passing through and cloud coverage preventing much radiational cooling. Lows will be in the mid to upper 40s.

LONG TERM /SUNDAY THROUGH WEDNESDAY/
High pressure shifts to our south, allowing southwest flow to really crank up the warm air advection across the region. Sunday and Monday will look to bring some of the warmest temperatures we have seen thus far this season with mid to upper 70s on Sunday and low to mid 80s by Monday afternoon! Mostly dry across the region during this timeframe as well, though a few isolated showers or a rumble of thunder cannot be ruled out mainly across the Poconos where the aforementioned warm front may linger nearby.

The stacked low shifting across the upper Midwest will slowly move into central Canada Monday into Tuesday, dragging along a cold front across the Ohio River Valley and eventually through the Mid Atlantic. This is where our next best chance for precipitation will come from and will be highly dependent on the timing of this low and its associated cold front. At the moment, some showers will be possible Monday night as the front gradually approaches the region, but the best chance for showers and thunderstorms will come Tuesday as the cold front, washing out at this point, finally arrives. Temperatures remain warm again Tuesday with upper 70s to low 80s. Not much cooler behind this weak cold front on Wednesday, however, with a surface high ridging in from the southeastern US to keep things on the mild side in the 70s.

AVIATION /09Z THURSDAY THROUGH MONDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas...

Through today...VFR. Northerly winds generally 5 to 10 knots before diminishing late day. High confidence.

Tonight...VFR. Winds becoming more northeasterly but slacking off to 5 kts or less overnight.

Outlook...

Friday...VFR.

Saturday...A period of near MVFR ceilings possible, most likely Saturday night as a warm front pushes through. Otherwise, mainly VFR.

Sunday and Monday...VFR conditions anticipated.

MARINE
Seas will remain elevated through today before slowly starting to come down tonight. For this reason, the Small Craft Advisory was extended to 22z today for our northern ocean zone off the coast of Monmouth County with it running until 10z Friday for the remaining ocean zones. Northeast winds will mostly be sub SCA.

Outlook...

Friday through Monday...The conditions are anticipated to be below Small Craft Advisory criteria.

FIRE WEATHER
RH's across much of the region will get quite low today, and we've had little rain now for a couple of weeks, allowing fine fuels to dry. While winds won't likely be up to Red Flag Criteria, there may be a need for a Special Weather Statement, which will be firmed up after morning coordination with our state partners.

PHI WATCHES/WARNINGS/ADVISORIES
PA...Freeze Watch from late tonight through Friday morning for PAZ061-062-103-105-106.
Frost Advisory until 9 AM EDT this morning for PAZ060>062-105.
NJ...Freeze Warning until 9 AM EDT this morning for NJZ001.
Freeze Watch from late tonight through Friday morning for NJZ001-007>010-012-013-015>022-027.
Frost Advisory until 9 AM EDT this morning for NJZ007>009.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ450.
Small Craft Advisory until 6 AM EDT Friday for ANZ451>455.

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Centreville Landing, Corsica River, Chester River, Maryland, Tide feet

Baltimore Harbor Approach
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Thu -- 12:32 AM EDT     -0.57 knots Max Ebb
Thu -- 03:09 AM EDT     0.00 knots Slack
Thu -- 06:14 AM EDT     Sunrise
Thu -- 06:51 AM EDT     Moonset
Thu -- 06:54 AM EDT     1.06 knots Max Flood
Thu -- 10:23 AM EDT     -0.00 knots Slack
Thu -- 01:43 PM EDT     -0.97 knots Max Ebb
Thu -- 05:31 PM EDT     0.00 knots Slack
Thu -- 07:48 PM EDT     0.40 knots Max Flood
Thu -- 07:53 PM EDT     Sunset
Thu -- 10:00 PM EDT     Moonrise
Thu -- 10:16 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Baltimore Harbor Approach, Maryland Current, knots

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