Rain Pushes North Into Dry Air
High pressure has supplied clear skies and dry air, resulting in a rather cool morning Friday across the Finger Lakes.
Poised just south of the region is a sharp gradient to a much more moist atmosphere. While the air over the Finger Lakes has less than 50% of its normal moisture content for late June, the air over southern Pennsylvania has 150% of its normal moisture content.
As our high pressure system presses east towards New England today, that moisture will start to push north. South winds will quickly increase the moisture content in the air above us, resulting in some clouds and, eventually, a few showers.
Initially, the rain showers that move in may not reach the ground, but before the afternoon is through, a few areas will see a shower or two.
High temperatures today will be driven by the early sunshine and south winds. Mid and upper 70s are likely with a few locations reaching 80 degrees.
Weekend Rain Forecast
Showers will increase this evening and overnight. A period of widespread showers and a couple of thunderstorms is expected Saturday morning before a lull during the mid-afternoon hours.
Late in the afternoon, a few scattered thunderstorms may pop up, especially over the western and northern Finger Lakes, where temperatures will get a bit warmer during the afternoon.
For high temperatures, look for mostly mid 70s with a few upper 70s in the vicinity of I-390.
Rain will taper off again as the sun sets and much of Saturday night will be quiet.
Showers and thunderstorms will likely develop again for Sunday, this time focusing a bit further south over the southern half of the Finger Lakes.
Temperatures Sunday will mostly reach the low 70s.
The storm system responsible for the rain this weekend will pull out by Monday, giving us a pleasant start to the week before a mid-week weather system brings an increase in temperature, then some rain.