Marine Weather and Tide Forecast for Geneva, NY

KEY MESSAGES
1) A cold airmass will continue to be in place through Tuesday morning with well below average temperatures. Scattered snow showers diminish this evening.

2) A gradual warm up is expected from mid week into next weekend along with mainly dry weather. The pattern may become more unsettled next weekend and into next week.

DISCUSSION
KEY MESSAGE 1...

A very cold airmass for late-April standards will be in place today with 850mb temperatures around -11C and 925mb temperatures hovering around -5C. A shortwave will be dropping southward into the area, with steep low level lapse rates, instability (MUCAPE 100 J/kg) and lingering moisture in the surface to 750mb (0-2km) layer of the atmosphere. This will set the stage for scattered snow showers to re-develop across the area today, especially in Central NY and the Twin Tiers. That being said, with the strong late April sun angle and surface temperatures likely at least a few degrees above freezing, snow will have a hard time accumulating on surfaces, especially paved ones. If there were to be any snow accumulations, it would be mainly in the morning before peak solar heating, and mainly at the higher elevations.

Otherwise, between these scattered snow showers, partly sunny skies are expected today. Highs will only be in the mid 30s to mid 40s, making it feel more like early March or early December, rather than 11 days away from May.

Dry air, clear skies, and a surface high building in will result in a very cold night tonight/early Tuesday morning. Widespread lows in the 20s are expected tonight, with some upper teens possible in the usual colder spots (Oneida County to the Catskills). As the high pressure system moves east of the area on Tuesday, a southerly return flow will develop, which will allow temperatures to rebound (highs in the mid 40s to mid 50s).

KEY MESSAGE 2...

Mainly dry weather is expected for most of the remainder of the week, aside from a frontal passage Tuesday night into Wednesday, which may bring scattered rain showers (possibly mixed with snow showers in the Catskills). Temperatures will progressively get a bit warmer each day starting Tuesday, with highs in the mid 40s to mid 50s Tuesday, mid 50s to mid 60s Wednesday, and upper 50s to upper 60s for Thursday and Friday.

There are indications that we could be going back into a wetter pattern next weekend as ensemble 500 mb height anomaly means show a trough trying to set up in the western US and SW flow developing over the east.

AVIATION /00Z TUESDAY THROUGH SATURDAY/
A scattered to broken cloud deck across the Twin Tiers along with a few lingering snow showers and flurries will clear as high pressure builds in overhead tonight leading to VFR conditions through tomorrow morning along with light winds. A deck of mid to high level clouds is expected to move in by tomorrow afternoon. As high pressure slides east and a frontal boundary approaches, there can be some isolated showers that develop, mainly after about 20Z. Winds will be becoming southwesterly at 5-10 knots tomorrow.

Outlook:

Tuesday night into Wednesday morning...Front approaches the region with scattered showers and restrictions possible.

Wednesday afternoon and Thursday...VFR conditions expected.

Friday...Mainly VFR with a few showers possible.

Saturday...Showers and associated restrictions possible; low chance of thunder.

BGM WATCHES/WARNINGS/ADVISORIES
PA...None.
NY...None.