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Relative Humidity

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NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | November 7, 2006
Ken Jackson of Baltimore said that when he was preparing to fly to Utah he heard forecasters say the relative humidity there was 15 percent. "What is the lowest relative humidity recorded?" Lower than that, Ken. Relative humidity is the water vapor content relative to the atmosphere's capacity at a given temperature. Warmer air can hold more water, so the number falls when dry air heats up. Chile's Atacama Desert averages 15 percent. In June, McCarran International Airport in Las Vegas reported 2 percent relative humidity.
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NEWS
By Scott Dance, The Baltimore Sun | July 10, 2013
Humidity is at or near its highest levels of the summer in the Baltimore area, but relief is in sight as the weekend approaches. The dew point reached a stifling 74 degrees by 11 a.m. at both Baltimore-Washington International Thurgood Marshall Airport and at the Inner Harbor, with temperatures only a few degrees warmer in the lower 80s. Dew point takes into account both the temperature and the relative humidity and gives a straightforward picture...
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NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | May 17, 2008
It was pouring when Charles Grene got home to Westminster on Sunday. He dialed the weather phone; the relative humidity was 79 percent. The Weather Channel said it was 81 percent. He's puzzled: "I thought that when it is raining the relative humidity was 100 percent." It is, Grasshopper, at least up where the water vapor is condensing. But the air is often drier at the surface, around our instruments. Raindrops can evaporate as they fall, producing veil-like clouds called "virga."
NEWS
By Scott Dance, The Baltimore Sun | May 20, 2013
Increasing humidity and highs around 80 degrees are forecast in the Baltimore area Monday, with a chance of showers or thunderstorms in the afternoon, according to the National Weather Service. A warm front moved over the area overnight, with lows in the mid- to upper 60s. Some drizzle and fog was expected to be possible in the early morning hours. Temperatures were expected to rise into the 70s by mid-morning and near 80 degrees by midday. Relative humidity was forecast to be 50-60 percent during the day with dew points in the lower 60s, a level at which humidity starts to become perceptible for most people.
NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | July 6, 2008
Stuart Godwin Jr. in Chestertown noticed that the June 30 relative humidity, reported here on July 1, soared from 51 percent at 1 p.m. to 76 percent at 3 p.m. before falling back. "Did [the] relative humidity actually fluctuate that much?" he asks. It did. BWI reported "light rain" about 3 p.m. The shower added moisture and cooled the air by 9 degrees. Cooler air can't hold as much water, so the RH - moisture relative to the air's capacity to hold it - spiked.
NEWS
By Scott Dance | May 29, 2012
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.
NEWS
By Scott Dance | March 23, 2012
We've had a good taste of early spring; now it's time for a little summer. Humidity is approaching levels more likely seen in May or June. Downtown, at the Sun weather station on Calvert Street, temperatures reached 80 degrees at 3 p.m. with a dew point of 62 degrees, which means a sticky feeling at the low end of uncomfortable territory for most people. Earlier this morning, there was 81 percent relative humidity and the dew point reached as high as 66. BWI Airport reported 80 degrees and a dew point of 52 as of 2 p.m.  It could likely be the hottest day of what has already been such a warm year.
NEWS
By Scott Dance, The Baltimore Sun | May 20, 2013
Increasing humidity and highs around 80 degrees are forecast in the Baltimore area Monday, with a chance of showers or thunderstorms in the afternoon, according to the National Weather Service. A warm front moved over the area overnight, with lows in the mid- to upper 60s. Some drizzle and fog was expected to be possible in the early morning hours. Temperatures were expected to rise into the 70s by mid-morning and near 80 degrees by midday. Relative humidity was forecast to be 50-60 percent during the day with dew points in the lower 60s, a level at which humidity starts to become perceptible for most people.
NEWS
By Scott Dance, The Baltimore Sun | July 10, 2013
Humidity is at or near its highest levels of the summer in the Baltimore area, but relief is in sight as the weekend approaches. The dew point reached a stifling 74 degrees by 11 a.m. at both Baltimore-Washington International Thurgood Marshall Airport and at the Inner Harbor, with temperatures only a few degrees warmer in the lower 80s. Dew point takes into account both the temperature and the relative humidity and gives a straightforward picture...
BUSINESS
March 30, 2003
After the heavy snow in February, the owner of an 18-year-old townhouse noticed that part of the roof was wet in his attic. It remained wet during the time that the snow was on the roof and spots of mold began to grow on the plywood roof sheathing. He asks why the problem occurred this year, but not in years past, and what can be done to prevent a recurrence. A little investigation revealed several factors inside the house that, combined with the severe cold weather, created the moisture problem.
NEWS
By Scott Dance | May 29, 2012
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.
NEWS
By Scott Dance | March 23, 2012
We've had a good taste of early spring; now it's time for a little summer. Humidity is approaching levels more likely seen in May or June. Downtown, at the Sun weather station on Calvert Street, temperatures reached 80 degrees at 3 p.m. with a dew point of 62 degrees, which means a sticky feeling at the low end of uncomfortable territory for most people. Earlier this morning, there was 81 percent relative humidity and the dew point reached as high as 66. BWI Airport reported 80 degrees and a dew point of 52 as of 2 p.m.  It could likely be the hottest day of what has already been such a warm year.
NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | July 6, 2008
Stuart Godwin Jr. in Chestertown noticed that the June 30 relative humidity, reported here on July 1, soared from 51 percent at 1 p.m. to 76 percent at 3 p.m. before falling back. "Did [the] relative humidity actually fluctuate that much?" he asks. It did. BWI reported "light rain" about 3 p.m. The shower added moisture and cooled the air by 9 degrees. Cooler air can't hold as much water, so the RH - moisture relative to the air's capacity to hold it - spiked.
NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | May 17, 2008
It was pouring when Charles Grene got home to Westminster on Sunday. He dialed the weather phone; the relative humidity was 79 percent. The Weather Channel said it was 81 percent. He's puzzled: "I thought that when it is raining the relative humidity was 100 percent." It is, Grasshopper, at least up where the water vapor is condensing. But the air is often drier at the surface, around our instruments. Raindrops can evaporate as they fall, producing veil-like clouds called "virga."
NEWS
By FRANK ROYLANCE and FRANK ROYLANCE,Sun Reporter -- Weather Blogger | February 18, 2007
Dennis Ferguson of Easton asks about the term "relative humidity. ... To what is it `relative?'" It's the percentage of water vapor in the atmosphere relative to the maximum the air could hold at a given temperature - 100 percent. Warmer air can hold more moisture. Take outdoor air at 40 degrees and 80 percent relative humidity, heat it to 70 degrees, and the relative humidity (the moisture content compared to what it could hold at 70) drops to 10 percent. That's why indoor air feels so darned dry in winter.
BUSINESS
March 30, 2003
After the heavy snow in February, the owner of an 18-year-old townhouse noticed that part of the roof was wet in his attic. It remained wet during the time that the snow was on the roof and spots of mold began to grow on the plywood roof sheathing. He asks why the problem occurred this year, but not in years past, and what can be done to prevent a recurrence. A little investigation revealed several factors inside the house that, combined with the severe cold weather, created the moisture problem.
NEWS
By Dennis O'Brien | June 17, 1991
Record-breaking heat brought an unwanted Father's Day present to Maryland yesterday -- triple-digit temperatures that sent people scurrying to beaches, backyard pools and just about any place that offered relief.The temperature hit 100 degrees in Baltimore and 99 at Baltimore-Washington International Airport about 3:30 p.m., breaking records set in 1957 when the mercury hit 99 and 97, respectively.But it felt even worse.Amet Figueroa, a National Weather Service meteorologist, said that the heat index -- a formula that combines the temperature and relative humidity -- reached a stifling 105 degrees in the Baltimore area.
NEWS
By Dennis O'Brien | June 17, 1991
Record-breaking heat brought an unwanted Father's Day present to Maryland yesterday -- triple-digit temperatures that sent people scurrying to beaches, backyard pools and just about any place that offered relief.The temperature hit 100 degrees in Baltimore and 99 at Baltimore-Washington International Airport about 3:30 p.m., breaking records set in 1957 when the mercury hit 99 and 97, respectively.But it felt even worse.Amet Figueroa, a National Weather Service meteorologist, said that the heat index -- a formula that combines the temperature and relative humidity -- reached a stifling 105 degrees in the Baltimore area.
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