The fourth day of a heatwave — and likely the peak of it — is underway throughout the area. A stronger mid-level ridge and a deeper southwesterly flow will cause temperatures to reach the middle to upper 90s this afternoon. Some spots could reach 100F with enough sunshine. The big difference compared to the past few days, however, is that more humidity will cause oppressive heat today. Heat index values could be between 105° to 110° F this afternoon.
As a pre-frontal trough and then cold front approaches, some showers and thunderstorms are likely in the area from late this afternoon through the evening. There is some potential, with increasing instability and shear, for some more organized strong to severe thunderstorms. Damaging wind gusts will be the main threat from these thunderstorms. The Storm Prediction Center now has a slight risk for severe thunderstorms for most of the region this afternoon and evening. Thunderstorms could also produce frequent cloud to ground lightning and very heavy rainfall with localized flash flooding. Some other highlight for next few days:
- Take precautions outside for the oppressive heat and possible strong to severe thunderstorms later today. Visit our premium hazardous weather dashboard — public today due to multiple hazards — for more information on timing and preparation.
- Sports fans: The Mets vs Cardinals game at Citi Field may be impacted by delays with showers and thunderstorms in the region. Stay tuned to our Sportscasts page for more updates as necessary throughout the day.
- Despite the cold front passing through tonight, the heat wave will continue Tuesday and Wednesday with sunshine and temperatures likely exceeding 90 degrees each day. But it will be less humid with drier westerly winds.
- Premium members: The long range forecast and briefing -now for the next 4 weeks– has been updated with new video discussion on Sunday. Next update is scheduled for Wednesday.
For more details on forecast later this week, more video discussions, and long-range forecasts and articles, sign up to become a premium member today!