Sunshine bakes Finger Lakes with heat and humidity

finger lakes weather forecast tuesday august 28 2018 heat advisory high heat humidity heat index
Tuesday and Wednesday will be the hottest days of August as temperatures reach the low 90s and heat index values range from 95-100 degrees. [Photo by meteorologist Drew Montreuil]

Late Summer Heat

A late season surge of heat and humidity will fry the Finger Lakes Tuesday and Wednesday with a hazardous combination of heat and humidity.

The sun has just come up and temperatures are starting the day anywhere from the upper 60s in the Southern Tier to as high as 77 degrees in Syracuse.

Expect temperatures to rise in a hurry this morning under mostly sunny skies and a gusty southwest wind.

Dewpoints will stay locked in the low 70s, making it feel extremely muggy and creating a potentially dangerous heat index this afternoon.

As temperatures push into the low 90s, the heat index will range from 95 to 100 degrees for most areas. Heat indices above 100 degrees will be in the northern Finger Lakes, especially in urbanized areas.

I expect only a few scattered clouds this afternoon. Wednesday will have a bit more in the way of cloud cover, but temperatures and heat indices will be very similar to today.

Thunderstorm Chances

This surge of heat is being spurred on by the interplay between low pressure just north of the Great Lakes and a high pressure system that is nosing into the Mid-Atlantic region from the south.

The high pressure system should keep the Finger Lakes dry both Tuesday and most of Wednesday, but it is not an absolute guarantee.

At least one weather model that I trust for thunderstorms shows a broken line of showers developing this afternoon roughly in a Corning-Ithaca-Cortland line. These southeastern areas should not expect to see rain today, but should also not be surprised if a brief shower or a clap of thunder passes by late in the afternoon.

The chances for showers and storms will be greater Wednesday during the late afternoon and evening as a cold front slowly approaches. These seem most likely over western and northern areas. A strong wind gust and frequent lightning will be possible.

Storms should weaken Wednesday evening with a few showers overnight as the front slides through.

Behind the Cold Front

The difference in the weather between Tuesday/Wednesday and Thursday could not be much greater.

Winds will change direction Wednesday night and will be from the north by sunrise Thursday morning. The north wind will quickly blow the heat and humidity to the south, leaving a rather cool day on Thursday.

In fact, high temperatures Thursday will be about 20 degrees colder than on Wednesday with most places struggling to get much beyond 70 degrees. Highs in the mid and upper 60s are not out of the question, especially near Lake Ontario where clouds and perhaps a couple lake effect rain showers will be most likely.

The north wind will turn to the east and southeast on Friday, cutting off the coldest air. Temperatures will moderate to a more seasonable level with highs Friday in the mid and upper 70s.

This weekend’s weather looks a bit unsettled with a few scattered showers or thunderstorms, but no major weather system to bring in more significant weather.

Advertise on FLX Weather

Finger Lakes Weather offers prime advertising positions to local businesses to help fund its operations.

With tens-of-thousands of views monthly, Finger Lakes Weather is a great option for getting known in the Finger Lakes while simultaneously helping a good cause.

Long-term advertisers, very small businesses, and non-profit organizations enjoy discounts to make advertising even more affordable.

There are no complicated algorithms to crack — your ad is always visible. The process is simple, too. Just send along your ad image, or have an ad created for you. The ad can thenbe linked to your website, Facebook page, or wherever you’d like. Images can >be changed as often as you like, too.

Advertising on Finger Lakes Weather is a winning proposal for everyone. Your business gets guaranteed local exposure. The Finger Lakes continues to get reliable, accurate weather information. FLX Weather gets the financial support it needs to continue and grow.

Fill out the form in the green box for more information!

Select the type of ad you are interested in. You can change this later!
Select how long you would like you ad to be displayed. You can change this later!
To be eligible for this discount, proof of 501(c)(3) status or proof of 3 or fewer paid employees may be requested.
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.). Drew and his wife have four young boys. When not working or playing with the boys, he is probably out for a run through the countryside.