A large and sprawling area of high pressure continues to dominate the eastern half of the country. Underneath this area of high pressure, or heat dome, high temperatures and humidity have been dominating the weather scene since Sunday. We are up to four consecutive days with 90 degrees plus with today expected to be our fifth.
Temperatures are expected to top out around 93° today while it appears Friday will be the hottest day with temps well into the mid 90s. The difference Friday will be the increase in southwesterly winds over us. This is a warming wind for Syracuse, as the air is forced down off the higher elevations to our south and west. Friday will be the one day this week that we challenge a daily record (97° in 1946). The humidity will still be an issue for us right through Saturday so another Heat Advisory may be issued for parts of Central New York today and especially Friday.
With the heat and humidity so high, we do run the risk of at least scattered showers and thunderstorms both today and tomorrow. That high we mentioned above is slowly shifting southwest away from us allowing jet stream winds aloft to drop south into southern Canada bringing a cold front close to northern New York. This could help with the development of any thunderstorms.
Change is still in store for early in the weekend as our threat for showers and thunderstorms is much greater Friday night into Saturday as the aforementioned cold front closes in and eventually sweeps through Central New York. Early indications suggest some thunderstorms may have very heavy rain and strong wind gusts. It also appears the best chance would come during the morning into the middle of the day.
Once the cold front clears the area Saturday night, a much cooler and less humid air mass will move in, providing much needed relief from the heat and humidity for the area Sunday into Monday. Temperatures will be near 80 with sunny skies and very comfortable humidity levels.