Marine Weather and Tide Forecast for Bowers, DE

KEY MESSAGES
1. Breezy winds through Thursday. A brief cool down Thursday and Friday. Generally milder temperatures return this weekend into next week.

2. We continue to watch a storm system for late Sunday into Monday, which could affect the area depending on its track.

DISCUSSION
KEY MESSAGE 1...Breezy winds through Thursday. A brief cool down Thursday and Friday. Generally milder temperatures return this weekend into next week.

High pressure continues to build in behind a cold front that passed through early Wednesday morning. The resultant tight pressure gradient is expected to linger through Thursday, keeping breezy WNW to NW winds in the forecast. Wind gusts 25-35 mph late this afternoon will subside slightly tonight before ramping back up Thursday morning with gusts around 20-25 mph.
Despite "warmer" temperatures than we have had recently, the wind chill will still make it feel rather cold. Overnight lows will be largely in the low to mid 20s, but wind chills will still be in the teens with single digits in the Poconos. A few snow showers will be possible in the southern Poconos tonight as an upper level shortwave pivots across southern New England.
This will also help usher in a colder airmass across the region.

High pressure will bring generally fair but somewhat cooler conditions for Thursday and Friday (compared to Wednesday).
Expect highs both days generally in the 30s with overnight lows in the teens and 20s. Windy conditions on Thursday will make it feel about 10 degrees colder. The airmass over the area moderates over the weekend as high pressure slowly shifts off to the east. Expect highs both Saturday and Sunday generally ranging from the 30s north to the middle to upper 40s south.
However overnight lows, at least for Saturday night will be below freezing in the 20s. The overall moderating trend looks to continue into next week with the one caveat being the coastal storm system that could impact the area by later Sunday into Monday (see Key Message #2). Depending on the strength and track of the system it could cause temperatures to be colder than we're currently thinking if we get into heavier precipitation that results in dynamic and evaporational cooling. Regardless of what happens with the storm, it will have departed by next Tuesday with highs by then looking to be well into the 40s for most areas with even some low 50s over parts of Delmarva.

KEY MESSAGE 2...We continue to watch a storm system for the late Sunday into Monday, which could affect the area depending on its track.

Model guidance continues to depict an area of low pressure affecting the eastern seaboard beginning late Sunday and continuing into Monday. There is still uncertainty in the intensity, track, and timing of this system. Most of the model guidance has been trending towards keeping the system farther south and east with less impact on our area. The airmass in place prior to this system arriving will be relatively mild (highs Saturday in the upper 30s to upper 40s), meaning rain or snow changing to rain would tend to be favored with any precipitation. However, a strong enough system could produce dynamic cooling, with just enough cold air for accumulating snow to occur across much of the CWA excluding most of the coast. This all said, a strong storm solution is a lower probability scenario based on the overall trends in deterministic and ensemble guidance. The latest NBM probabilities for snowfall amounts of at least 2 inches are only in the 10-20% range across the area, lowest over southern DE and coastal NJ and highest over the Poconos. This is similar to the previous cycle. Not high probabilities, but not zero either.

In terms of our forecast, we stayed largely with the NBM which has 40-60% POPs late Sunday into early Monday (lowest north, highest over southern DE). Most likely an precip would fall as rain near the coast and over southern DE, with snow or some mixing with snow possible for a time farther north towards the urban corridor and points northward. However it's worth noting these areas farther north that have a better chance of seeing any precip fall as snow also have lower POPs only in the 40-50% range at this time.

AVIATION /06Z THURSDAY THROUGH MONDAY/
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Overnight...VFR with a scattered to broken deck of cloud cover around 4-5 thousand feet. NW winds around 10 to 15 with some gusts up to 20-25 knots at times. Gusts should generally diminish in frequency overnight. Moderate-high confidence.

Thursday...VFR with increasing clouds by mid-day. Northwest winds around 10-15 kt with gusts up to 20-25 kt in the afternoon. High confidence.

Outlook...

Thursday night through Sunday morning...VFR.

Sunday afternoon through Monday evening...Restrictions possible with rain S/E and snow N/W.

MARINE
A Small Craft Advisory remains in effect for all marine zones through Thursday. As colder air works in through tonight and into Thursday, stronger WNW to NW winds are expected with gusts to 25-30 kt. Seas 3-5 feet. SCA conditions will begin to subside late Thursday afternoon/early evening.

Regarding the river/bay ice...Significant ice cover continues across many area bay waters and inland estuaries. This includes, but is not limited to the Delaware estuary. On rivers, the ice thickness is enough to cause some restrictions in the flow. Per satellite imagery and ice analysis data, the Delaware River is mostly ice covered from the entrance to Delaware Bay northward, or upstream, to at least Washington Crossing.

The most common ways river ice can break up is either through a thermal or mechanical means. We would like to see temperatures rise into the 40s for a few days, which parts of the region are forecast to get to over the weekend and into next week.
Significant rainfall, producing river rises, can also break up ice but that is not in the forecast this week.

As a result, ice cover will continue. There may be a pause in the ice growth during the daylight hours as temperatures rise to and above freezing, however temperatures at night will continue to support ice expansion.

Outlook...

SCA conditions are possible Thursday evening, but winds and seas will be subsiding during this period. Beyond this time, conditions most likely stay below Small Craft Advisory levels through the weekend into early next week unless a coastal storm system to our south tracks farther north closer to our waters.
This could result in increasing winds/seas late Sunday into Monday.

PHI WATCHES/WARNINGS/ADVISORIES
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 6 PM EST this evening for ANZ430- 431-450>455.