Thunderstorms interrupt dangerous heat in the Finger Lakes

finger lakes weather forecast monday june 18 2018 heat advisory heat index thunderstorms
Dangerous heat index values of 95-100 degrees will develop Monday before thunderstorms pop up. [Photo by Steph Montreuil]

First the Heat, then the Storms

A very hot and humid air mass over the Finger Lakes will bring dangerous heat, then thunderstorms to the Finger Lakes on Monday.

Temperatures will rise through the 70s and well into the 80s very quickly this morning. By midday, 90s will be showing up with heat index values already becoming dangerous.

Heat advisories are in place for most of the Finger Lakes Weather forecast area — only Wyoming and Allegany counties are not included in the advisory.

While it is very hot and humid at the surface, temperatures aloft will also be quite warm. This will actually be a deterrent for thunderstorms, but there should still be enough instability for activity to start popping up by the mid-afternoon.

Thunderstorms will start as scattered cells that will grow into semi-organized clusters. Multiple rounds of these thunderstorm clusters will be possible between 3-9 pm.

A few storms could get rather robust. Damaging winds will be the main threat. Similar to last Wednesday, most areas will not see severe weather but a few isolated areas could see some intense winds. A little small hail is possible as well.

The atmosphere will have copious amounts of moisture to work with as well. Torrential downpours are likely.

This thunderstorm activity will likely keep temperatures from reaching their full potential this afternoon, with more highs in the upper 80s and low 90s as opposed to mid 90s.

Check back later today for LIVE storm updates!

Rest of the Week More Comfortable

By Tuesday morning, a cold front should have pushed south of the region. After some morning clouds, skies will turn sunny.

A fresh north wind will blow with gusts of 20-25 mph throughout the day. Humidity levels will be much lower, with dewpoints comfortably in the 50s.

Expect high temperatures Tuesday to reach the mid 70s.

Some rain showers will be possible on Wednesday, especially across the Southern Tier. Otherwise, the remainder of the week looks dry.

Temperatures will be in the 70s much of the week but could return to the 80s by Friday.

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Meteorologist Drew Montreuil
Follow Meteorologist Drew Montreuil:

Meteorologist Drew Montreuil has been forecasting the weather in the Finger Lakes region since 2006 and has degrees in meteorology from SUNY Oswego (B.S. with Honors) and Cornell (M.S.). When not forecasting, he can be found working at the local library, making goat milk soap, running until his legs burn, or playing with his three young boys.