Muggy weather to break Wednesday

(National Weather Service )
May 29, 2012|By Scott Dance

The hot and humid weather that dominated Memorial Day weekend is lingering over Maryland one more day, but it should move out by Wednesday morning.

Saturday and Sunday both topped out at 89 degrees, while Memorial Day on Monday was the hottest day of the year at 93 degrees. The heat far exceeded normal highs of about 78 degrees, but records were a few degrees away at 94, 95 and 97 degrees.

Tuesday's forecast high of 91 shouldn't threaten the record of 97 set in 1969. As of 11 a.m., though, soaring temperatures appeared likely to top that forecast. BWI Marshall Airport reached 86 degrees by that time, climbing quickly from an overnight low of 72.

Humidity has made the heat all the more oppressive and likely caused a lot of air conditioners to be turned on over the weekend. The dew point reached 71 degrees Monday at BWI Marshall Airport, a level that means uncomfortable stickiness and is more normal for July or August in Maryland. It comes from a mix of high temperatures and high relative humidity, at 50 or 60 percent or higher.

The dew point will again hover around 70 degrees Tuesday, with 50 percent relative humidity this afternoon making the expected high of 91 feel more like 95 degrees, according to the National Weather Service.

For the rest of the week, temperatures and relative humidity are expected to drop, bringing dew points back down to the 40s or 50s.

Have a weather question? E-mail me at sdance@baltsun.com or tweet to @MdWeather.

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