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High humidity to last through mid-week

Humidity is intense in some parts of Maryland, and it is expected to continue for a few days. Summer weather is upon us.

Martin State Airport in Middle River posted a dew point of 72 degrees as of 9:45 a.m., beyond the normal mugginess of a hot Baltimore day. The air is thick, wet and heavy there. In Annapolis, the dew point was 68 degrees by 10 a.m., while BWI Marshall Airport was at 64 degrees.

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With dew points, anything above 60 degrees is uncomfortable, while getting above 70 degrees is downright unbearable. Getting toward 80 degrees, there is a health risk for many, such as those who have asthma.

A cold front is expected to pass through Wednesday morning, clearing out humidity and bringing dew points back into the 50s.

The heat and humidity are meanwhile impacting air quality. Monday's forecast was for "code yellow," affecting those sensitive to air pollution. The region still has not seen code orange or higher this year, but the National Weather Service has issued a change in its warning policies for those days. From today's Sun print editions:

As of June 5, the National Weather Service will no longer send out alerts for "code orange" air quality days, when air pollution is considered unhealthy for sensitive populations. The weather service's Sterling, Va., office will continue to release alerts on "code red" days, considered unhealthy for all people. So far this year, there have been no air quality alerts issued in the Baltimore area; there were 19 "orange" days and five "red" days in 2011.

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

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