June 29: Another Heat Wave Next Week

While today's temperatures were not much colder than yesterday, still in the 80s to lower 90s, humidity did decrease from yesterday, with the temperatures also cooling down starting tomorrow.

A dry pattern has now developed, which should make for a potentially very dry first half of July, with no rain expected in the 7-day range. This week's temperatures should be comfortable compared to the last week, with below average temperatures returning, but enjoy it while it lasts, as what could be the biggest heat wave since 2008 could take place next week.

Tomorrow's Outlook:

Tomorrow will fortunately be colder than today. With a trough moving in, high temperatures will only rise into the lower to mid 70s inland, upper 70s to lower 80s for the immediate NYC area, and with a NW wind, Long Island and S CT will also rise into the upper 70s. This is nearly 10-15 degrees colder than today for some places.

The rest of the region should also be chilly tomorrow, with high temperatures in the 70s and 80s for the Mid Atlantic, and in the 60s to lower 70s for the Northeast. The only areas of rain tomorrow should be in the northern Northeast and New England, otherwise dry conditions are expected.

Thursday and Friday: Chilly, Dry

The next three days are going to be very comfortable, and may be the coolest days for a while. Thursday morning should be quite chilly, with low temperatures in the 50s across most of the area, except for NYC, which should be in the upper 50s to lower 60s. A few upper 40s are also expected in the interior. High temperatures should be in the lower to mid 70s inland, and in the mid to upper 70s for the immediate NYC area, Long Island and S CT. Friday should be slightly warmer than Thursday.

Heat Wave To Start On Sunday, July 4th

Saturday will already bring back warmth and humidity, something not seen since today. High temperatures will warm up into the mid to upper 80s, with sunny skies expected. By Sunday, July 4th, however, the temperatures will only continue to warm up, reaching the lower to mid 90s for the immediate NYC area, along with increased humidity.

Sunday will be the start of what could potentially be the biggest heat wave since June 2008, when temperatures reached the lower 100s in parts of the area. With 850 mb temperatures in the range of 18c to 22c and no precipitation around, combined with sunny skies, high temperatures are easily going to reach the mid to upper 90s away from the coast, and if the models remain steady or trend slightly warmer, lower 100s may even be possible in parts of the immediate NYC area, however this is still uncertain, and the trends later this week will tell if this could happen or not. Along with humid conditions, the heat index could easily reach the 100s during this time period.

These very hot conditions should last until about Thursday, when slightly cooler temperatures are possible, but not significantly colder. Afterwards, there is still a lot of uncertainty, however if the ECMWF verifies, the heat returns yet again for Friday and Saturday. Stay tuned as more details on this potential heat wave become clearer through this week.