The National Weather Service is warning of another hot day is forecast for the St. Lawrence Valley today after a record-setting day yesterday.

An ozone alert has been posted for most of the state, including the area just east of Lake Ontario.

The heat wave in the North Country and around the Northeast produced a record high temperature in Massena of 92 degrees at the 4 p.m. observation at Richards Field, Massena's airport. That broke the previous record high of 91 degrees set in 1953.

The average high for the date is 77 degrees. The record low was 40 in 1967.

It will have to get a bit hotter today to break the record high for June 21 at Massena, 95 degrees during the same heat wave in 1953.

A cold front moving through the region today will bring relief tomorrow and the chance of some thunderstorms tonight and early tomorrow. The low tonight is expected to be in the low to mid 60s, and the high tomorrow will be in the low to mid 80 with clearing skies.

Friday night, the is a slight chance of rain or thunderstorms with a low in the mid 50s.

Saturday and Sunday are expected to be mostly sunny, with a 30 percent chance of showers or thunderstorms with highs in the mid 70s.

There are more details on the forecast on our weather page, http://northcountrynow.com/weather.

The NWS forecast for the St. Lawrence Valley and northwestern Adirondacks:

Today: Sunny, with a high near 93. West wind between 9 and 16 mph.

Tonight: A slight chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 62. Southwest wind between 6 and 10 mph. Chance of precipitation is 20%.

Friday: A slight chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 84. West wind between 8 and 10 mph. Chance of precipitation is 20%.

Friday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54. West wind between 3 and 6 mph. Chance of precipitation is 20%.

Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 78. West wind between 5 and 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: A slight chance of showers before 11pm. Partly cloudy, with a low around 54. Chance of precipitation is 20%.

Sunday: A chance of showers after 2pm. Mostly sunny, with a high near 77. Chance of precipitation is 30%.

Sunday Night: A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 50%.

Monday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 70. Chance of precipitation is 60%.

Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Chance of precipitation is 40%.

Tuesday: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.

Tuesday Night: A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.

Wednesday: A chance of showers. Partly sunny, with a high near 68. Chance of precipitation is 40%.