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May 19, 2009

Morning cold breaks record


The morning low out at BWI this morning reached 38 degrees, setting a new record for a May 19 in Baltimore. The previous record had stood for only six years, having been set on this date in 2003.

The National Weather Service has not posted it yet (at this writing). But I've called it to their attention, so it may pop up in their data shortly.

MODIS/DNRThe low out on the WeatherDeck this morning was a bracing 36 degrees. With the heat off for the season, the blanket and spread were not quite enough for us this morning as the dawn broke. Getting up seemed the better choice. 

Here at Calvert & Centre streets, the low was 46 degrees. There were no new records at either Dulles International (low was 38 degrees, record 36), or Reagan National (low was 45 degrees, record 43). 

The high-pressure system that moved into the region late yesterday (left) had shoved all the clouds away by this morning (see satellite photo above) and dried out the atmosphere. As winds died down around sunset, that set up the perfect conditions for radiational cooling. So much of the meagre warmth we accumulated yesterday radiated back into space overnight, driving temperatures down.

The relative humidity readings today are headed rapidly downward - from 78 percent around sunrise to 44 percent at this writing (and still falling). The barometer, meanwhile, has been headed in the opposite direction, holding steady now at around 30.50 inches.

The forecast shows we can expect temperatures to warm to around 80 degrees by tomorrow, and hang around that mark right into the weekend. The sunny skies will linger, too, at least until Sunday, when chances for showers and thunderstorms begin to rise again.

Here are some overnight lows, collected by the folks at

Accident:  31 degrees

Cumberland:  33 degrees

Sabillasville:  35 degrees

Woodbine:  35 degrees

Waldorf:  36 degrees

Monkton:  36 degrees

Easton:  36 degrees

Williamsport:  37 degrees

Sandy Spring:  37 degrees

Bowie:  37 degrees

Darlington:  38 degrees

Millersville:  38 degrees 


Posted by Frank Roylance at 9:54 AM | | Comments (3)
Categories: By the numbers


off-topic, but...

when I was going to bed this morning around 4:30a (I work late, at a restaurant), I noticed a large, steady, bright, yellowish light (object, star, planet?) in the east-northeast early-morning sky, off to the left of the moon. No, it wasn't the sun! It was so bright, I assumed it was a hovering helicopter, but it remained stationary about one hand over the horizon, for the 15-20 minutes I watched it, until I finally fell asleep.

Is there an easy explanation? I hope so! with all the good people up and headed to work at that hour, I would have to think that many people saw this...

FR: Easy. That's Venus. The much fainter dot to its left and slightly lower, is Mars. The bright "star" shining higher, in the southeast, is Jupiter. This will be a great week for stargazing with this cool, dry air mass.

thank you, Frank!

There were at least a couple more records set or tied in MD and NJ.

FR: Thanks!

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About Frank Roylance
This site is the Maryland Weather archive. The current Maryland Weather blog can be found here.
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page. Frank also answers readers’ weather queries for the newspaper and the blog. Frank Roylance retired in October 2011. Maryland Weather is now being updated by members of The Baltimore Sun staff

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