First heatwave of the year expected to impact the DC area into next week

5- Day Temperature Trend

June started off with near-average temperatures and a break in the rainy pattern following the dreariness that WAS the month of May. The next few days will return to cooler than normal temperatures as an upper-level disturbance swings overhead, but big changes will follow this weekend into next week.

A ridge of high pressure will swing off the southeast coast this weekend into early next week, ensuring a flow out of the southwest. This will in turn build in heat to the Mid Atlantic over several days.

So far, the DC area has experienced one 90 degree day in late April (91 on the 29th) and two more in May. This time around should be the first heatwave of the year, with highs in the 90s Sunday through at least Wednesday of next week.

While DC will have the heat, storm chances appear minimal through the middle of next week. Storms next Wednesday or Thursday may act to bring in a cooler airmass but there still appears to be some uncertainty at this point.

As far as 90 degree days are concerned, last year DC didn’t record its first 90 degree day until June 11th but still managed a total of 58 for the year. That also included an astounding 22 days at 95 degrees or higher.

A repeat performance of last summer isn’t anticipated at this time but we’ll continue to monitor some of the longer range models for trends.

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